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159 results on '"Federal Ministry of Education '

1. Crystal Nucleation in Supercooled Atomic Liquids

Author: Federal Ministry of Education and Research (Germany), German Research Foundation, Max Planck Society, Universidade Federal de São Carlos, #NODATA#, Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72], Möller, Johannes, Schottelius, Alexander, Caresana, Michele, Boesenberg, Ulrike, Kim, Chan, Dallari, Francesco, Ezquerra, Tiberio A., Fernández Sánchez, José María, Gelisio, Luca, Glaesener, Andrea, Goy, Claudia, Hallmann, Jörg, Kalinin, Anton, Kurta, Ruslan P., Lapkin, Dmitry, Lehmkühler, Felix, Mambretti, Francesco, Scholz, Markus, Shayduk, Roman, Trinter, Florian, Vartaniants, Ivan A., Zozulya, Alexey, Galli, Davide E., Grübel, Gerhard, Madsen, Anders, Caupin, Frédéric, Grisenti, Robert E., Federal Ministry of Education and Research (Germany), German Research Foundation, Max Planck Society, Universidade Federal de São Carlos, #NODATA#, Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72], Möller, Johannes, Schottelius, Alexander, Caresana, Michele, Boesenberg, Ulrike, Kim, Chan, Dallari, Francesco, Ezquerra, Tiberio A., Fernández Sánchez, José María, Gelisio, Luca, Glaesener, Andrea, Goy, Claudia, Hallmann, Jörg, Kalinin, Anton, Kurta, Ruslan P., Lapkin, Dmitry, Lehmkühler, Felix, Mambretti, Francesco, Scholz, Markus, Shayduk, Roman, Trinter, Florian, Vartaniants, Ivan A., Zozulya, Alexey, Galli, Davide E., Grübel, Gerhard, Madsen, Anders, Caupin, Frédéric, and Grisenti, Robert E.
Abstract: The liquid-to-solid phase transition is a complex process that is difficult to investigate experimentally with sufficient spatial and temporal resolution. A key aspect of the transition is the formation of a critical seed of the crystalline phase in a supercooled liquid, that is, a liquid in a metastable state below the melting temperature. This stochastic process is commonly described within the framework of classical nucleation theory, but accurate tests of the theory in atomic and molecular liquids are challenging. Here, we employ femtosecond x-ray diffraction from microscopic liquid jets to study crystal nucleation in supercooled liquids of the rare gases argon and krypton. Our results provide stringent limits to the validity of classical nucleation theory in atomic liquids, and offer the long-sought possibility of testing nonclassical extensions of the theory.
Published: 2024

2. Network percolation provides early warnings of abrupt changes in coupled oscillatory systems: An explanatory analysis

Author: European Commission, Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), Federal Ministry of Education and Research (Germany), Ehstand, Noémie [0000-0001-8846-6670], Donner, Reik V. [0000-0001-7023-6375], López, Cristóbal [0000-0002-3445-4284], Hernández-García, Emilio [0000-0002-9568-8287+, Ehstand, Noémie, Donner, Reik V., López, Cristóbal, Hernández-García, Emilio, European Commission, Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), Federal Ministry of Education and Research (Germany), Ehstand, Noémie [0000-0001-8846-6670], Donner, Reik V. [0000-0001-7023-6375], López, Cristóbal [0000-0002-3445-4284], Hernández-García, Emilio [0000-0002-9568-8287+, Ehstand, Noémie, Donner, Reik V., López, Cristóbal, and Hernández-García, Emilio
Abstract: Functional networks are powerful tools to study statistical interdependency structures in spatially extended or multivariable systems. They have been used to get insights into the dynamics of complex systems in various areas of science. In particular, percolation properties of correlation networks have been employed to identify early warning signals of critical transitions. In this work, we further investigate the corresponding potential of percolation measures for the anticipation of different types of sudden shifts in the state of coupled irregularly oscillating systems. As a paradigmatic model system, we study the dynamics of a ring of diffusively coupled noisy FitzHugh-Nagumo oscillators and show that, when the oscillators are nearly completely synchronized, the percolation-based precursors successfully provide very early warnings of the rapid switches between the two states of the system. We clarify the mechanisms behind the percolation transition by separating global trends given by the mean-field behavior from the synchronization of individual stochastic fluctuations. We then apply the same methodology to real-world data of sea surface temperature anomalies during different phases of the El Niño-Southern Oscillation. This leads to a better understanding of the factors that make percolation precursors effective as early warning indicators of incipient El Niño and La Niña events.
Published: 2023

3. Optimal storage capacity of quantum Hopfield neural networks

Author: European Research Council, German Research Foundation, Federal Ministry of Education and Research (Germany), Bödeker, Lukas [0000-0001-9202-5659], Fiorelli, Eliana [0000-0003-4677-3204], Müller, Markus [0000-0002-2813-3097], Bödeker, Lukas, Fiorelli, Eliana, Müller, Markus, European Research Council, German Research Foundation, Federal Ministry of Education and Research (Germany), Bödeker, Lukas [0000-0001-9202-5659], Fiorelli, Eliana [0000-0003-4677-3204], Müller, Markus [0000-0002-2813-3097], Bödeker, Lukas, Fiorelli, Eliana, and Müller, Markus
Abstract: Quantum neural networks form one pillar of the emergent field of quantum machine learning. Here quantum generalizations of classical networks realizing associative memories - capable of retrieving patterns, or memories, from corrupted initial states - have been proposed. It is a challenging open problem to analyze quantum associative memories with an extensive number of patterns and to determine the maximal number of patterns the quantum networks can reliably store, i.e., their storage capacity. In this work, we propose and explore a general method for evaluating the maximal storage capacity of quantum neural network models. By generalizing what is known as Gardner's approach in the classical realm, we exploit the theory of classical spin glasses for deriving the optimal storage capacity of quantum networks with quenched pattern variables. As an example, we apply our method to an open-system quantum associative memory formed of interacting spin-1/2 particles realizing coupled artificial neurons. The system undergoes a Markovian time evolution resulting from a dissipative retrieval dynamics that competes with a coherent quantum dynamics. We map out the nonequilibrium phase diagram and study the effect of temperature and Hamiltonian dynamics on the storage capacity. Our method opens an avenue for a systematic characterization of the storage capacity of quantum associative memories.
Published: 2023

4. Coulomb excitation of Zn 74,76

Author: European Commission, Research Foundation - Flanders, Federal Ministry of Education and Research (Germany), Ministry of Science and Higher Education (Poland), Ministerio de Ciencia e Innovación (España), National Science Centre (Poland), RIKEN Nishina Center for Accelerator-Based Science, Illana, A. [0000-0003-0274-3388], Zielińska, M. [0000-0001-5622-6349], Van Duppen, P. [0000-0002-5053-7370], Wrzosek-Lipska, K. [0000-0003-0046-1387], Lenzi, S. M. [0000-0002-4666-8431], Nowacki, F. [0000-0002-7854-8717], Dao, D. D. [0000-0001-9884-4591], Otsuka, T. [0000-0002-1593-5322], Tsunoda, Y. [0000-0002-0398-1639], Illana, A., Zielińska, M., Huyse, M., Rapisarda, E., Van Duppen, P., Wrzosek-Lipska, K., Lenzi, S. M., Nowacki, F., Dao, D. D., Otsuka, T., Tsunoda, Y., Arnswald, K., García Borge, María José, Cederkäll, J., Chrysalidis, K., Cortés, M. L., Cox, D. M., Day Goodacre, T., De Witte, H., Doherty, D. T., Fedosseev, V., Gaffney, L. P., Hadyńska-Klek, K., Hess, H., Henrich, C., Hlebowicz, M., Komorowska, M., Korten, W., Kröll, Th, Lozano Benito, M. L., Lutter, R., Marsh, B., Martikainen, L., Matejska-Minda, M., Molkanov, P. L., Nacher, Enrique, Nannini, A., Napiorkowski, P. J., Pakarinen, J., Papadakis, P., Queiser, M., Reiter, P., Rocchini, M., Rodriguez, J. A., Rolke, T., Rosiak, D., Rothe, S., Seidlitz, M., Seiffert, C., Siebeck, B., Siesling, E., Snäll, J., Srebrny, J., Thiel, S., Warr, N., Wenander, F., European Commission, Research Foundation - Flanders, Federal Ministry of Education and Research (Germany), Ministry of Science and Higher Education (Poland), Ministerio de Ciencia e Innovación (España), National Science Centre (Poland), RIKEN Nishina Center for Accelerator-Based Science, Illana, A. [0000-0003-0274-3388], Zielińska, M. [0000-0001-5622-6349], Van Duppen, P. [0000-0002-5053-7370], Wrzosek-Lipska, K. [0000-0003-0046-1387], Lenzi, S. M. [0000-0002-4666-8431], Nowacki, F. [0000-0002-7854-8717], Dao, D. D. [0000-0001-9884-4591], Otsuka, T. [0000-0002-1593-5322], Tsunoda, Y. [0000-0002-0398-1639], Illana, A., Zielińska, M., Huyse, M., Rapisarda, E., Van Duppen, P., Wrzosek-Lipska, K., Lenzi, S. M., Nowacki, F., Dao, D. D., Otsuka, T., Tsunoda, Y., Arnswald, K., García Borge, María José, Cederkäll, J., Chrysalidis, K., Cortés, M. L., Cox, D. M., Day Goodacre, T., De Witte, H., Doherty, D. T., Fedosseev, V., Gaffney, L. P., Hadyńska-Klek, K., Hess, H., Henrich, C., Hlebowicz, M., Komorowska, M., Korten, W., Kröll, Th, Lozano Benito, M. L., Lutter, R., Marsh, B., Martikainen, L., Matejska-Minda, M., Molkanov, P. L., Nacher, Enrique, Nannini, A., Napiorkowski, P. J., Pakarinen, J., Papadakis, P., Queiser, M., Reiter, P., Rocchini, M., Rodriguez, J. A., Rolke, T., Rosiak, D., Rothe, S., Seidlitz, M., Seiffert, C., Siebeck, B., Siesling, E., Snäll, J., Srebrny, J., Thiel, S., Warr, N., and Wenander, F.
Abstract: The first experiment using radioactive beams post-accelerated by the HIE-ISOLDE facility has enabled to obtain a precise set of B(E2) transition probabilities in neutron-rich 74,76Zn isotopes. The resulting B(E2; 21+ → 01+) values are consistent with those determined in earlier REX-ISOLDE measurements. While the B(E2; 41+ → 21+) transition probability in 76Zn is also in agreement with earlier Coulomb-excitation results, the value obtained for 74Zn is considerably lower. For the first time, a spectroscopic quadrupole moment of the 21+ state was measured for an exotic nucleus in this mass region. A detailed comparison is presented with large-scale shell-model and Monte Carlo shell-model calculations.
Published: 2023

5. Collective effects on the performance and stability of quantum heat engines

Author: Ministerio de Ciencia e Innovación (España), European Commission, Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil), Federal Ministry of Education, Science and Research (Austria), Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, da Silva Souza, Leonardo [0000-0001-5089-7483], Manzano, Gonzalo [0000-0003-1359-6344], da Silva Souza, Leonardo, Manzano, Gonzalo, Fazio, Rosario, Iemini, Fernando, Ministerio de Ciencia e Innovación (España), European Commission, Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil), Federal Ministry of Education, Science and Research (Austria), Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, da Silva Souza, Leonardo [0000-0001-5089-7483], Manzano, Gonzalo [0000-0003-1359-6344], da Silva Souza, Leonardo, Manzano, Gonzalo, Fazio, Rosario, and Iemini, Fernando
Abstract: Recent predictions for quantum-mechanical enhancements in the operation of small heat engines have raised renewed interest in their study both from a fundamental perspective and in view of applications. One essential question is whether collective effects may help to carry enhancements over larger scales, when increasing the number of systems composing the working substance of the engine. Such enhancements may consider not only power and efficiency, that is, its performance, but, additionally, its constancy, that is, the stability of the engine with respect to unavoidable environmental fluctuations. We explore this issue by introducing a many-body quantum heat engine model composed by spin pairs working in continuous operation. We study how power, efficiency, and constancy scale with the number of spins composing the engine and introduce a well-defined macroscopic limit where analytical expressions are obtained. Our results predict power enhancements, in both finite-size and macroscopic cases, for a broad range of system parameters and temperatures, without compromising the engine efficiency, accompanied by coherence-enhanced constancy for finite sizes. We discuss these quantities in connection to thermodynamic uncertainty relations.
Published: 2022

6. Spin-orbit induced equilibrium spin currents in materials

Author: European Commission, Science Foundation Ireland, Royal Society (UK), European Research Council, Universidad del País Vasco, Eusko Jaurlaritza, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), German Research Foundation, Federal Ministry of Education and Research (Germany), Droghetti, Andrea, Rungger, Ivan, Rubio, Angel, Tokatly, I. V., European Commission, Science Foundation Ireland, Royal Society (UK), European Research Council, Universidad del País Vasco, Eusko Jaurlaritza, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), German Research Foundation, Federal Ministry of Education and Research (Germany), Droghetti, Andrea, Rungger, Ivan, Rubio, Angel, and Tokatly, I. V.
Abstract: The existence of pure spin currents in absence of any driving external field is commonly considered an exotic phenomenon appearing only in quantum materials, such as topological insulators. We demonstrate instead that equilibrium spin currents are a rather general property of materials with non-negligible spin-orbit coupling (SOC). Equilibrium spin currents can be present at the surfaces of a slab. Yet, we also propose the existence of global equilibrium spin currents, which are net bulk spin currents along specific crystallographic directions of solid-state materials. Equilibrium spin currents are allowed by symmetry in a very broad class of systems having gyrotropic point groups. The physics behind equilibrium spin currents is uncovered by making an analogy between electronic systems with SOC and non-Abelian gauge theories. The electron spin can be seen as analogous to the color degree of freedom in SU(2) gauge theories and equilibrium spin currents can then be identified with diamagnetic color currents appearing as the response to a effective non-Abelian magnetic field generated by the SOC. Equilibrium spin currents are not associated with spin transport and accumulation, but they should nonetheless be carefully taken into account when computing transport spin currents. We provide quantitative estimates of equilibrium spin currents for a number of different systems, specifically the Au(111) and Ag(111) metallic surfaces presenting Rashba-type surface states, nitride semiconducting nanostructures, and bulk materials, such as the prototypical gyrotropic medium tellurium. In doing so, we also point out the limitations of model approaches showing that first-principles calculations are needed to obtain reliable predictions. We therefore use density functional theory computing the so-called bond currents, which represent a powerful tool to deeply understand the relation between equilibrium currents, electronic structure, and crystal point group.
Published: 2022

7. Class of distorted Landau levels and Hall phases in a two-dimensional

Author: Federal Ministry of Education and Research (Germany), European Research Council, European Commission, Simons Foundation, National Science Foundation (US), Flatiron Institute, German Research Foundation, Sidler, Dominik, Rokaj, Vasil, Ruggenthaler, Michael, Rubio, Angel, Federal Ministry of Education and Research (Germany), European Research Council, European Commission, Simons Foundation, National Science Foundation (US), Flatiron Institute, German Research Foundation, Sidler, Dominik, Rokaj, Vasil, Ruggenthaler, Michael, and Rubio, Angel
Abstract: An analytic closed form solution is derived for the bound states of a two-dimensional electron gas subject to a static, inhomogeneous (1/r in plane decaying) magnetic field, including the Zeeman interaction. The solution provides access to many-body properties of a two-dimensional, noninteracting, electron gas in the thermodynamic limit. Radially distorted Landau levels can be identified as well as magnetic field induced density and current oscillations close to the magnetic impurity. These radially localized oscillations depend strongly on the coupling of the spin to the magnetic field, which gives rise to nontrivial spin currents. Moreover, the Zeeman interaction introduces a unique flat band, i.e., infinitely degenerate energy level in the ground state, assuming a spin gs-factor of two. Surprisingly, the charge and current densities can be computed analytically for this fully filled flat band in the thermodynamic limit. Numerical calculations show that the total magnetic response of the electron gas remains diamagnetic (similar to Landau levels) independent of the Fermi energy. However, the contribution of certain, infinitely degenerate energy levels may become paramagnetic. Furthermore, numerical computations of the Hall conductivity reveal asymptotic properties of the electron gas, which are driven by the anisotropy of the vector potential instead of the magnetic field, i.e., become independent of spin. Eventually, the distorted Landau levels give rise to negative and positive Hall conductivity phases, with sharp transitions at specific Fermi energies. Overall, our work merges “impurity” with Landau-level physics, which provides novel physical insights, not only locally, but also in the asymptotic limit. This paves the way for a large number of future theoretical as well as experimental investigations, e.g., to include electronic correlations and to investigate two-dimensional systems such as graphene or transition metal dichalcogenides under the influence of i
Published: 2022

8. Isotopic cross sections of fragmentation residues produced by light projectiles on carbon near

Author: Ministerio de Ciencia e Innovación (España), Xunta de Galicia, Federal Ministry of Education and Research (Germany), Swedish Research Council, Department of Energy (US), Boillos, J. M., Cortina-Gil, D., Benlliure, J., Rodríguez-Sánchez, J. L., Alvarez-Pol, H., Atar, L., Aumann, T., Avdeichikov, V. V., Beceiro-Novo, S., Bemmerer, D., Bertulani, C. A., Boretzky, K., García Borge, María José, Caamaño, M., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chartier, M., Chulkov, L., Cravo, E., Crespo, R. N.P., Dillmann, I., Díaz Fernández, P., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, Luis M., Freer, M., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Hufnagel, A., Ignatov, A., Johansson, H.T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kröll, T., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J. F.D.C., Marganiec, J., Movsesyan, A., Nacher, E., Najafi, M.A., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, Ángel, Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, Guillermo, Rigollet, C., Rossi, D. M., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I. J., Taylor, J. T., Tengblad, Olof, Thies, R., Togano, Y., Vandebrouck, M., Velho, P. J.F., Volkov, V., Wagner, A., Wamers, F., Weick, H., Wheldon, C., Wilson, G. L., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., Zuber, K., Ministerio de Ciencia e Innovación (España), Xunta de Galicia, Federal Ministry of Education and Research (Germany), Swedish Research Council, Department of Energy (US), Boillos, J. M., Cortina-Gil, D., Benlliure, J., Rodríguez-Sánchez, J. L., Alvarez-Pol, H., Atar, L., Aumann, T., Avdeichikov, V. V., Beceiro-Novo, S., Bemmerer, D., Bertulani, C. A., Boretzky, K., García Borge, María José, Caamaño, M., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chartier, M., Chulkov, L., Cravo, E., Crespo, R. N.P., Dillmann, I., Díaz Fernández, P., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, Luis M., Freer, M., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Hufnagel, A., Ignatov, A., Johansson, H.T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kröll, T., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J. F.D.C., Marganiec, J., Movsesyan, A., Nacher, E., Najafi, M.A., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, Ángel, Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, Guillermo, Rigollet, C., Rossi, D. M., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I. J., Taylor, J. T., Tengblad, Olof, Thies, R., Togano, Y., Vandebrouck, M., Velho, P. J.F., Volkov, V., Wagner, A., Wamers, F., Weick, H., Wheldon, C., Wilson, G. L., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., and Zuber, K.
Abstract: We measured 135 cross sections of residual nuclei produced in fragmentation reactions of C12, N14, and O13−16,20,22 projectiles impinging on a carbon target at kinetic energies of near 400A MeV, most of them for the first time, with the RB3/LAND setup at the GSI facility in Darmstadt (Germany). The use of this state-of-the-art experimental setup in combination with the inverse kinematics technique gave the full identification in atomic and mass numbers of fragmentation residues with a high precision. The cross sections of these residues were determined with uncertainties below 20% for most of the cases. These data are compared to other previous measurements with stable isotopes and are also used to benchmark different model calculations.
Published: 2022

9. Inferring work by quantum superposing forward and time-reversal evolutions

Author: Royal Society (UK), Ministerio de Ciencia e Innovación (España), European Commission, Federal Ministry of Education, Science and Research (Austria), Austrian Science Fund, Foundational Questions Institute, John Templeton Foundation, Rubino, Giulia, Manzano, Gonzalo, Rozema, Lee A., Walther, Philip, Parrondo, J. M. R., Brukner, Časlav, Royal Society (UK), Ministerio de Ciencia e Innovación (España), European Commission, Federal Ministry of Education, Science and Research (Austria), Austrian Science Fund, Foundational Questions Institute, John Templeton Foundation, Rubino, Giulia, Manzano, Gonzalo, Rozema, Lee A., Walther, Philip, Parrondo, J. M. R., and Brukner, Časlav
Abstract: The study of thermodynamic fluctuations allows one to relate the free energy difference between two equilibrium states with the work done on a system through processes far from equilibrium. This finding plays a crucial role in the quantum regime, where the definition of work becomes nontrivial. Based on these relations, here we develop a simple interferometric method allowing a direct estimation of the work distribution and the average dissipative work during a driven thermodynamic process by superposing the forward and time-reversal evolutions of the process. We show that our scheme provides useful upper bounds on the average dissipative work even without full control over the thermodynamic process, and we propose methodological variations depending on the possible experimental limitations encountered. Finally, we exemplify its applicability by an experimental proposal for implementing our method on a quantum photonics system, on which the thermodynamic process is performed through polarization rotations induced by liquid crystals acting in a discrete temporal regime.
Published: 2022

10. Non-Abelian Quantum Transport and Thermosqueezing Effects

Author: Abdus Salam International Centre for Theoretical Physics, Ministerio de Ciencia e Innovación (España), European Commission, Federal Ministry of Education, Science and Research (Austria), Foundational Questions Institute, Silicon Valley Community Foundation, Fundação de Amparo à Pesquisa do Estado de São Paulo, Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil), Manzano, Gonzalo, Parrondo, J. M. R., Landi, Gabriel T., Abdus Salam International Centre for Theoretical Physics, Ministerio de Ciencia e Innovación (España), European Commission, Federal Ministry of Education, Science and Research (Austria), Foundational Questions Institute, Silicon Valley Community Foundation, Fundação de Amparo à Pesquisa do Estado de São Paulo, Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil), Manzano, Gonzalo, Parrondo, J. M. R., and Landi, Gabriel T.
Abstract: Modern quantum experiments provide examples of transport with noncommuting quantities, offering a tool to understand the interplay between thermal and quantum effects. Here we set forth a theory for non-Abelian transport in the linear response regime. Our key insight is to use generalized Gibbs ensembles with noncommuting charges as the basic building blocks and strict charge-preserving unitaries in a collisional setup. The linear response framework is then built using a collisional model between two reservoirs. We show that the transport coefficients obey Onsager reciprocity. Moreover, we find that quantum coherence, associated with the noncommutativity, acts so as to reduce the net entropy production, when compared to the case of commuting transport. This therefore provides a clear connection between quantum coherent transport and dissipation. As an example, we study heat and squeezing fluxes in bosonic systems, characterizing a set of thermosqueezing coefficients with potential applications in metrology and heat-to-work conversion in the quantum regime.
Published: 2022

11. Survival and extreme statistics of work, heat, and entropy production in steady-state heat engines

Author: Ministerio de Ciencia e Innovación (España), European Commission, Federal Ministry of Education, Science and Research (Austria), Manzano, Gonzalo, Roldán, Édgar, Ministerio de Ciencia e Innovación (España), European Commission, Federal Ministry of Education, Science and Research (Austria), Manzano, Gonzalo, and Roldán, Édgar
Abstract: We derive universal bounds for the finite-time survival probability of the stochastic work extracted in steady-state heat engines and the stochastic heat dissipated to the environment. We also find estimates for the time-dependent thresholds that these quantities do not surpass with a prescribed probability. At long times, the tightest thresholds are proportional to the large deviation functions of stochastic entropy production. Our results entail an extension of martingale theory for entropy production, for which we derive universal inequalities involving its maximum and minimum statistics that are valid for generic Markovian dynamics in nonequilibrium stationary states. We test our main results with numerical simulations of a stochastic photoelectric device.
Published: 2022

12. Investigation of the ground-state spin inversion in the neutron-rich isotopes

Author: RIKEN Nishina Center for Accelerator-Based Science, European Commission, Ministry of Science and Technology of Vietnam, Ministerio de Ciencia, Innovación y Universidades (España), Helmholtz International Center for FAIR, Croatian Science Foundation, German Research Foundation, Institute for Basic Science (South Korea), Federal Ministry of Education and Research (Germany), National Research, Development and Innovation Office (Hungary), Japan Society for the Promotion of Science, National Research Council of Canada, Department of Energy (US), Oak Ridge National Laboratory (US), University of Leicester, Science and Technology Facilities Council (UK), Natural Sciences and Engineering Research Council of Canada, Linh, B.D., Corsi, A., Gillibert, A., Obertelli, A., Doornenbal, P., Barbieri, C., Chen, S., Chung, L.X., Duguet, Thomas, Gómez-Ramos, M., Holt, J.D., Moro, A., Navrátil, P., Ogata, K., Phuc, N.T.T., Shimizu, N., Somà, V., Utsuno, Y., Achouri, N.L., Baba, H., Browne, F., Calvet, D., Château, F., Chiga, N., Cortés, M.L., Delbart, A., Gheller, J.M., Giganon, A., Hilaire, C., Isobe, T., Kobayashi, T., Kubota, Y., Lapoux, V., Liu, H. N., Motobayashi, T., Murray, I., Otsu, H., Panin, V., Paul, N., Rodriguez, W., Sakurai, H., Sasano, M., Steppenbeck, D., Stuhl, L., Sun, Y.L., Togano, Y., Uesaka, T., Wimmer, K., Yoneda, K., Vaquero, Victor, RIKEN Nishina Center for Accelerator-Based Science, European Commission, Ministry of Science and Technology of Vietnam, Ministerio de Ciencia, Innovación y Universidades (España), Helmholtz International Center for FAIR, Croatian Science Foundation, German Research Foundation, Institute for Basic Science (South Korea), Federal Ministry of Education and Research (Germany), National Research, Development and Innovation Office (Hungary), Japan Society for the Promotion of Science, National Research Council of Canada, Department of Energy (US), Oak Ridge National Laboratory (US), University of Leicester, Science and Technology Facilities Council (UK), Natural Sciences and Engineering Research Council of Canada, Linh, B.D., Corsi, A., Gillibert, A., Obertelli, A., Doornenbal, P., Barbieri, C., Chen, S., Chung, L.X., Duguet, Thomas, Gómez-Ramos, M., Holt, J.D., Moro, A., Navrátil, P., Ogata, K., Phuc, N.T.T., Shimizu, N., Somà, V., Utsuno, Y., Achouri, N.L., Baba, H., Browne, F., Calvet, D., Château, F., Chiga, N., Cortés, M.L., Delbart, A., Gheller, J.M., Giganon, A., Hilaire, C., Isobe, T., Kobayashi, T., Kubota, Y., Lapoux, V., Liu, H. N., Motobayashi, T., Murray, I., Otsu, H., Panin, V., Paul, N., Rodriguez, W., Sakurai, H., Sasano, M., Steppenbeck, D., Stuhl, L., Sun, Y.L., Togano, Y., Uesaka, T., Wimmer, K., Yoneda, K., and Vaquero, Victor
Abstract: A first -ray study of spectroscopy was performed at the Radioactive Isotope Beam Factory with projectiles at 217 MeV/nucleon, impinging on the liquid hydrogen target of the MINOS device. Prompt deexcitation rays were measured with the NaI(Tl) array DALI2. Through the one-proton knockout reaction , a spin assignment could be determined for the low-lying states of from the momentum distribution obtained with the SAMURAI spectrometer. A spin-parity is deduced for the ground state of , similar to the recently studied isotope . The evolution of the energy difference is compared to state-of-the-art theoretical predictions.
Published: 2021

13. Experimental Reconstruction of the Few-Photon Nonlinear Scattering Matrix from a Single Quantum Dot in a Nanophotonic Waveguide

Author: Danish National Research Foundation, European Commission, Federal Ministry of Education and Research (Germany), German Research Foundation, Comunidad de Madrid, Consejo Superior de Investigaciones Científicas (España), Le Jeannic, Hanna, Ramos del Río, Tomás, Simonsen, Signe F., Pregnolato, Tommaso, Liu, Zhe, Schott, Rüdiger, Wieck, Andreas D., Ludwig, Arne, Rotenberg, Nir, Lodahl, Peter, Danish National Research Foundation, European Commission, Federal Ministry of Education and Research (Germany), German Research Foundation, Comunidad de Madrid, Consejo Superior de Investigaciones Científicas (España), Le Jeannic, Hanna, Ramos del Río, Tomás, Simonsen, Signe F., Pregnolato, Tommaso, Liu, Zhe, Schott, Rüdiger, Wieck, Andreas D., Ludwig, Arne, Rotenberg, Nir, and Lodahl, Peter
Abstract: Coherent photon-emitter interfaces offer a way to mediate efficient nonlinear photon-photon interactions, much needed for quantum information processing. Here we experimentally study the case of a two-level emitter, a quantum dot, coupled to a single optical mode in a nanophotonic waveguide. We carry out few-photon transport experiments and record the statistics of the light to reconstruct the scattering matrix elements of one- and two-photon components. This provides direct insight to the complex nonlinear photon interaction that contains rich many-body physics.
Published: 2021

14. First -decay spectroscopy of and new -decay branches of

Author: National Science Centre (Poland), Universidad Complutense de Madrid, Agencia Estatal de Investigación (España), Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), Fundação para a Ciência e a Tecnologia (Portugal), European Organization for Nuclear Research, Institute of Atomic Physics (Romania), European Commission, Academy of Finland, York University, Piersa-Siłkowska, M., Korgul, A., Benito, J., Fraile, Luis M., Benzoni, G., Berry, T., García Borge, María José, Carmona, M., Chrysalidis, K., Correia, J.G., Costache, C., Cubiss, J.G., Day Goodacre, T., De Witte, H., Fedorov, D.V., Fedosseev, V.N., Fernández-Martínez, G., Fynbo, H.O.U., Galaviz, D., Galve, P., García-Díez, M., Greenlees, P.T., Grzywacz, R., Harkness-Brennan, L.J., Henrich, C., Huyse, M., Ibáñez, P., Illana, A., Janas, Z., Johnston, K., Jolie, J., Judson, D.S., Karanyonchev, V., Kicinska-Habior, M., Konki, J., Koszuk, L., Kurcewicz, J., Lazarus, I., Lică, R., López-Montes, A., Mach, H., Madurga, M., Marroquín, I., Marsh, B., Martínez Rodríguez, María del Carmen, Nácher, Enrique, Olaizola, B., Page, R.D., Perea, Ángel, Pucknell, V., Rykaczewski, K.P., Régis, J.M., Schomacker, K., Sánchez-Parcerisa, D., Sánchez-Tembleque, V., Tengblad, Olof, Udías, J.M., Vedia, V., Villa, A., Viñals, S., Warr, N., National Science Centre (Poland), Universidad Complutense de Madrid, Agencia Estatal de Investigación (España), Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), Fundação para a Ciência e a Tecnologia (Portugal), European Organization for Nuclear Research, Institute of Atomic Physics (Romania), European Commission, Academy of Finland, York University, Piersa-Siłkowska, M., Korgul, A., Benito, J., Fraile, Luis M., Benzoni, G., Berry, T., García Borge, María José, Carmona, M., Chrysalidis, K., Correia, J.G., Costache, C., Cubiss, J.G., Day Goodacre, T., De Witte, H., Fedorov, D.V., Fedosseev, V.N., Fernández-Martínez, G., Fynbo, H.O.U., Galaviz, D., Galve, P., García-Díez, M., Greenlees, P.T., Grzywacz, R., Harkness-Brennan, L.J., Henrich, C., Huyse, M., Ibáñez, P., Illana, A., Janas, Z., Johnston, K., Jolie, J., Judson, D.S., Karanyonchev, V., Kicinska-Habior, M., Konki, J., Koszuk, L., Kurcewicz, J., Lazarus, I., Lică, R., López-Montes, A., Mach, H., Madurga, M., Marroquín, I., Marsh, B., Martínez Rodríguez, María del Carmen, Nácher, Enrique, Olaizola, B., Page, R.D., Perea, Ángel, Pucknell, V., Rykaczewski, K.P., Régis, J.M., Schomacker, K., Sánchez-Parcerisa, D., Sánchez-Tembleque, V., Tengblad, Olof, Udías, J.M., Vedia, V., Villa, A., Viñals, S., and Warr, N.
Abstract: The decay of the neutron-rich and was investigated experimentally in order to provide new insights into the nuclear structure of the tin isotopes with magic proton number above the shell. The -delayed -ray spectroscopy measurement was performed at the ISOLDE facility at CERN, where indium isotopes were selectively laser-ionized and on-line mass separated. Three -decay branches of were established, two of which were observed for the first time. Population of neutron-unbound states decaying via rays was identified in the two daughter nuclei of and , at excitation energies exceeding the neutron separation energy by 1 MeV. The -delayed one- and two-neutron emission branching ratios of were determined and compared with theoretical calculations. The -delayed one-neutron decay was observed to be dominant -decay branch of even though the Gamow-Teller resonance is located substantially above the two-neutron separation energy of . Transitions following the decay of are reported for the first time, including rays tentatively attributed to . In total, six new levels were identified in on the basis of the coincidences observed in the and decays. A transition that might be a candidate for deexciting the missing neutron single-particle state in was observed in both decays and its assignment is discussed. Experimental level schemes of and are compared with shell-model predictions. Using the fast timing technique, half-lives of the , and levels in were determined. From the lifetime of the state measured for the first time, an unexpectedly large transition strength was deduced, which is not reproduced by the shell-model calculations.
Published: 2021

15. Observation of new neutron-rich isotopes in the vicinity of Zr 110

Author: RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Japan Society for the Promotion of Science, National Research Foundation of Korea, Science and Technology Facilities Council (UK), Department of Energy (US), Federal Ministry of Education and Research (Germany), Ministerio de Ciencia e Innovación (España), Department for Business, Energy and Industrial Strategy (UK), National Measurement System (UK), Sumikama, T., Fukuda, N., Inabe, N., Kameda, D., Kubo, T., Shimizu, Y., Suzuki, H., Takeda, H., Yoshida, K., Baba, H., Browne, F., Bruce, A. M., Carroll, R., Chiga, N., Daido, R., Didierjean, F., Doornenbal, P., Fang, Y., Gey, G., Ideguchi, E., Isobe, T., Lalkovski, S., Li, Z., Lorusso, G., Lozeva, R., Nishibata, H., Nishimura, S., Nishizuka, I., Odahara, A., Patel, Z., Podolyák, Zs., Regan, P. H., Rice, S., Roberts, O. J., Sakurai, H., Simpson, G. S., Sinclair, L., Söderström, P. A., Tanaka, M., Taprogge, J., Watanabe, H., Werner, V., Wieland, O., Wu, J., Xu, Z. Y., Yagi, A., RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Japan Society for the Promotion of Science, National Research Foundation of Korea, Science and Technology Facilities Council (UK), Department of Energy (US), Federal Ministry of Education and Research (Germany), Ministerio de Ciencia e Innovación (España), Department for Business, Energy and Industrial Strategy (UK), National Measurement System (UK), Sumikama, T., Fukuda, N., Inabe, N., Kameda, D., Kubo, T., Shimizu, Y., Suzuki, H., Takeda, H., Yoshida, K., Baba, H., Browne, F., Bruce, A. M., Carroll, R., Chiga, N., Daido, R., Didierjean, F., Doornenbal, P., Fang, Y., Gey, G., Ideguchi, E., Isobe, T., Lalkovski, S., Li, Z., Lorusso, G., Lozeva, R., Nishibata, H., Nishimura, S., Nishizuka, I., Odahara, A., Patel, Z., Podolyák, Zs., Regan, P. H., Rice, S., Roberts, O. J., Sakurai, H., Simpson, G. S., Sinclair, L., Söderström, P. A., Tanaka, M., Taprogge, J., Watanabe, H., Werner, V., Wieland, O., Wu, J., Xu, Z. Y., and Yagi, A.
Abstract: Neutron-rich radioactive isotope (RI) beams in the vicinity of Zr110 were produced using the in-flight fission of a 345-MeV/nucleon U238 beam at the RIKEN Radioactive Isotope Beam Factory. The RI beams were separated in flight by the large-acceptance two-stage fragment separator BigRIPS. Isotopes were clearly identified in a low-background particle-identification plot, which was obtained from the measurements of time of flight, magnetic rigidity, and energy loss using beam-line detectors placed in the BigRIPS separator and the ZeroDegree spectrometer. Nine new isotopes, Br101, Kr102, Rb105,106, Sr108, Y110,111, Zr114, and Nb117, are reported for the first time, with their measured production cross sections compared with the extrapolations of lighter isotopes down to the femtobarn regime.
Published: 2021

16. Isomeric states in neutron-rich nuclei around $N = 40$

Author: RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Japan Society for the Promotion of Science, Federal Ministry of Education and Research (Germany), German Research Foundation, Science and Technology Facilities Council (UK), National Research Foundation of Korea, National Research, Development and Innovation Office (Hungary), Ministry of Human Capacities (Hungary), Ministerio de Economía y Competitividad (España), Hungarian Academy of Sciences, Wimmer, K., Recchia, F., Lenzi, Silvia M., Riccetto, S., Davinson, T., Estrade, A., Griffin, C.J., Nishimura, S., Phong, V., Söderström, P. -A., Aktas, O., Al-Aqeel, M., Ando, T., Baba, H., Bae, S., Choi, S., Doornenbal, P., Ha, J., Harkness-Brennan, L.J., Isobe, T., John, P.R., Kahl, D., Kiss, G., Kojouharov, I., Kurz, N., Labiche, M., Matsui, K., Momiyama, S., Napoli, D.R., Niikura, M., Nita, C., Saito, Y., Sakurai, H., Schaffner, H., Schrock, P., Stahl, C., Sumikama, T., Werner, V., Witt, W., Woods, P.J., RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Japan Society for the Promotion of Science, Federal Ministry of Education and Research (Germany), German Research Foundation, Science and Technology Facilities Council (UK), National Research Foundation of Korea, National Research, Development and Innovation Office (Hungary), Ministry of Human Capacities (Hungary), Ministerio de Economía y Competitividad (España), Hungarian Academy of Sciences, Wimmer, K., Recchia, F., Lenzi, Silvia M., Riccetto, S., Davinson, T., Estrade, A., Griffin, C.J., Nishimura, S., Phong, V., Söderström, P. -A., Aktas, O., Al-Aqeel, M., Ando, T., Baba, H., Bae, S., Choi, S., Doornenbal, P., Ha, J., Harkness-Brennan, L.J., Isobe, T., John, P.R., Kahl, D., Kiss, G., Kojouharov, I., Kurz, N., Labiche, M., Matsui, K., Momiyama, S., Napoli, D.R., Niikura, M., Nita, C., Saito, Y., Sakurai, H., Schaffner, H., Schrock, P., Stahl, C., Sumikama, T., Werner, V., Witt, W., and Woods, P.J.
Abstract: Neutron-rich nuclei in the vicinity of the $N=40$ island of inversion are characterized by shell evolution and exhibit deformed ground states. In several nuclei isomeric states have been observed and attributed to excitations to the intruder neutron $1g_{9/2}$ orbital. In the present study we searched for isomeric states in nuclei around $N=40$, $Z=22$ produced by projectile fragmentation at RIBF. Delayed $\gamma$ rays were detected by the EURICA germanium detector array. High statistics data allowed for an updated decay scheme of $^{60}$V. The lifetime of an isomeric state in $^{64}$V was measured for the first time in the present experiment. A previously unobserved isomeric state was discovered in $^{58}$Sc. The measured lifetime suggests a parity changing transition, originating from an odd number of neutrons in the $1g_{9/2}$ orbital. The nature of the isomeric state in $^{58}$Sc is thus different from isomers in the less exotic V and Sc nuclei.
Published: 2021

17. Versatile Atomic Magnetometry Assisted by Bayesian Inference

Author: Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Eusko Jaurlaritza, Universidad del País Vasco, Federal Ministry of Education and Research (Germany), Alexander von Humboldt Foundation, Science Foundation Ireland, Leverhulme Trust, Royal Society (UK), Engineering and Physical Sciences Research Council (UK), Puebla, Ricardo, Ban, Y., Haase, J.F., Plenio, M.B., Paternostro, M., Casanova, J., Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Eusko Jaurlaritza, Universidad del País Vasco, Federal Ministry of Education and Research (Germany), Alexander von Humboldt Foundation, Science Foundation Ireland, Leverhulme Trust, Royal Society (UK), Engineering and Physical Sciences Research Council (UK), Puebla, Ricardo, Ban, Y., Haase, J.F., Plenio, M.B., Paternostro, M., and Casanova, J.
Abstract: Quantum sensors typically translate external fields into a periodic response whose frequency is then determined by analyses performed in Fourier space. This allows for a linear inference of the parameters that characterize external signals. In practice, however, quantum sensors are able to detect fields only in a narrow range of amplitudes and frequencies. A departure from this range, as well as the presence of significant noise sources and short detection times, lead to a loss of the linear relationship between the response of the sensor and the target field, thus limiting the working regime of the sensor. Here we address these challenges by means of a Bayesian inference approach that is tolerant to strong deviations from desired periodic responses of the sensor and is able to provide reliable estimates even with a very limited number of measurements. We demonstrate our method for an 171Yb+ trapped-ion quantum sensor but stress the general applicability of this approach to different systems.
Published: 2021

18. Population of lead isotopes in binary reactions using a Rb-94 radioactive beam

Author: European Commission, Science and Technology Facilities Council (UK), Croatian Science Foundation, Federal Ministry of Education and Research (Germany), Colovic, P., Szilner, S., Illana, A., Valiente-Dobón, J.J., Corradi, L., Pollarolo, G., Mijatovic, T., Goasduff, A., Benzoni, G., García Borge, María José, Boso, A., Boukhari, A., Ceruti, S., Cubiss, J.G., Angelis, G. de, Witte, H. de, Fioretto, E., Fransen, Ch., Galtarossa, F., Gaffney, L.P., Giannopoulos, E., Hess, H., Jurado-Gómez, M.L., Kaya, L., Kröll, Th., Marchi, T., Menegazzo, R., Mengoni, D., Napoli, D.R., O'Neill, G., Pakarinen, J., Podolyák, Zs., Recchia, F., Reiter, P., Rosiak, D., Snall, J., Spagnoletti, P., Testov, D., Thiel, S., Warr, N., Zidarova, R., European Commission, Science and Technology Facilities Council (UK), Croatian Science Foundation, Federal Ministry of Education and Research (Germany), Colovic, P., Szilner, S., Illana, A., Valiente-Dobón, J.J., Corradi, L., Pollarolo, G., Mijatovic, T., Goasduff, A., Benzoni, G., García Borge, María José, Boso, A., Boukhari, A., Ceruti, S., Cubiss, J.G., Angelis, G. de, Witte, H. de, Fioretto, E., Fransen, Ch., Galtarossa, F., Gaffney, L.P., Giannopoulos, E., Hess, H., Jurado-Gómez, M.L., Kaya, L., Kröll, Th., Marchi, T., Menegazzo, R., Mengoni, D., Napoli, D.R., O'Neill, G., Pakarinen, J., Podolyák, Zs., Recchia, F., Reiter, P., Rosiak, D., Snall, J., Spagnoletti, P., Testov, D., Thiel, S., Warr, N., and Zidarova, R.
Abstract: We measured absolute cross sections for neutron transfer channels populated in the Rb-94 + Pb-208 binary reaction. Cross sections have been extracted identifying directly the lead isotopes with the high efficiency MINIBALL gamma-ray array coupled to a particle detector combined with a radioactive Rb-94 beam delivered at E-lab = 6.2 MeV/nucleon by the HIE-ISOLDE facility. We observed sizable cross sections in the neutron-rich mass region, where the heavy partner acquires neutrons. A fair agreement between the measured cross sections with those from GRAZING calculations gives confidence in the cross-section predictions of more neutron-rich nuclei produced via a larger number of transferred nucleons.
Published: 2020

19. Evolution of Octupole Deformation in Radium Nuclei from Coulomb Excitation of Radioactive Ra 222 and Ra 228 Beams

Author: Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), National Science Centre (Poland), European Commission, Research Foundation - Flanders, Belgian Science Policy Office, University of Leuven, Russian Foundation for Basic Research, Academy of Finland, Butler, P.A., Gaffney, L.P., Spagnoletti, P., Abrahams, K., Bowry, M., Cederkäll, J., Angelis, G. de, Witte, H. de, Garrett, P.E., Goldkuhle, A., Henrich, C., Illana, A., Johnston, K., Joss, D.T., Keatings, J.M., Kelly, N.A., Komorowska, M., Konki, J., Kröll, T., Lozano, M., Nara Singh, B.S., O'Donnell, D., Ojala, J., Page, R.D., Pedersen, L.G., Raison, C., Reiter, P., Rodríguez, J. A., Rosiak, D., Rothe, S., Scheck, M., Seidlitz, M., Shneidman, T.M., Siebeck, B., Sinclair, J., Smith, J. F., Stryjczyk, M., Van Duppen, P., Víñals, S., Virtanen, V., Warr, N., Wrzosek-Lipska, K., Zielinska, M., Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), National Science Centre (Poland), European Commission, Research Foundation - Flanders, Belgian Science Policy Office, University of Leuven, Russian Foundation for Basic Research, Academy of Finland, Butler, P.A., Gaffney, L.P., Spagnoletti, P., Abrahams, K., Bowry, M., Cederkäll, J., Angelis, G. de, Witte, H. de, Garrett, P.E., Goldkuhle, A., Henrich, C., Illana, A., Johnston, K., Joss, D.T., Keatings, J.M., Kelly, N.A., Komorowska, M., Konki, J., Kröll, T., Lozano, M., Nara Singh, B.S., O'Donnell, D., Ojala, J., Page, R.D., Pedersen, L.G., Raison, C., Reiter, P., Rodríguez, J. A., Rosiak, D., Rothe, S., Scheck, M., Seidlitz, M., Shneidman, T.M., Siebeck, B., Sinclair, J., Smith, J. F., Stryjczyk, M., Van Duppen, P., Víñals, S., Virtanen, V., Warr, N., Wrzosek-Lipska, K., and Zielinska, M.
Abstract: There is sparse direct experimental evidence that atomic nuclei can exhibit stable "pear" shapes arising from strong octupole correlations. In order to investigate the nature of octupole collectivity in radium isotopes, electric octupole (E3) matrix elements have been determined for transitions in Ra222,228 nuclei using the method of sub-barrier, multistep Coulomb excitation. Beams of the radioactive radium isotopes were provided by the HIE-ISOLDE facility at CERN. The observed pattern of E3 matrix elements for different nuclear transitions is explained by describing Ra222 as pear shaped with stable octupole deformation, while Ra228 behaves like an octupole vibrator.
Published: 2020

20. Sequential Nature of (p,3p) Two-Proton Knockout from Neutron-Rich Nuclei

Author: RIKEN Nishina Center for Accelerator-Based Science, German Research Foundation, Alexander von Humboldt Foundation, European Research Council, Japan Society for the Promotion of Science, Federal Ministry of Education and Research (Germany), Ministry of Science and Technology of Vietnam, Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), National Natural Science Foundation of China, Chinese Academy of Sciences, Frotscher, A., Gómez-Ramos, M., Obertelli, A., Doornenbal, P., Authelet, G., Baba, H., Calvet, D., Château, F., Chen, S., Corsi, A., Delbart, A., Gheller, J.M., Giganon, A., Gillibert, A., Isobe, T., Lapoux, V., Matsushita, M., Momiyama, S., Motobayashi, T., Niikura, M., Otsu, H., Paul, N., Péron, C., Peyaud, A., Pollacco, E.C., Roussé, J.Y., Sakurai, H., Santamaria, C., Sasano, M., Shiga, Y., Shimizu, N., Steppenbeck, D., Takeuchi, S., Taniuchi, R., Uesaka, T., Wang, H., Yoneda, K., Ando, T., Arici, T., Blazhev, A., Browne, F., Bruce, A.M., Carroll, R., Chung, L.X., Cortés, M.L., Dewald, M., Ding, B., Dombrádi, Zs., Flavigny, F., Jungclaus, Andrea, Vaquero, Victor, RIKEN Nishina Center for Accelerator-Based Science, German Research Foundation, Alexander von Humboldt Foundation, European Research Council, Japan Society for the Promotion of Science, Federal Ministry of Education and Research (Germany), Ministry of Science and Technology of Vietnam, Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), National Natural Science Foundation of China, Chinese Academy of Sciences, Frotscher, A., Gómez-Ramos, M., Obertelli, A., Doornenbal, P., Authelet, G., Baba, H., Calvet, D., Château, F., Chen, S., Corsi, A., Delbart, A., Gheller, J.M., Giganon, A., Gillibert, A., Isobe, T., Lapoux, V., Matsushita, M., Momiyama, S., Motobayashi, T., Niikura, M., Otsu, H., Paul, N., Péron, C., Peyaud, A., Pollacco, E.C., Roussé, J.Y., Sakurai, H., Santamaria, C., Sasano, M., Shiga, Y., Shimizu, N., Steppenbeck, D., Takeuchi, S., Taniuchi, R., Uesaka, T., Wang, H., Yoneda, K., Ando, T., Arici, T., Blazhev, A., Browne, F., Bruce, A.M., Carroll, R., Chung, L.X., Cortés, M.L., Dewald, M., Ding, B., Dombrádi, Zs., Flavigny, F., Jungclaus, Andrea, and Vaquero, Victor
Abstract: Twenty-one two-proton knockout (p,3p) cross sections were measured from neutron-rich nuclei at ∼250 MeV/nucleon in inverse kinematics. The angular distribution of the three emitted protons was determined for the first time, demonstrating that the (p,3p) kinematics are consistent with two sequential proton-proton collisions within the projectile nucleus. Ratios of (p,3p) over (p,2p) inclusive cross sections follow the trend of other many-nucleon removal reactions, further reinforcing the sequential nature of (p,3p) in neutron-rich nuclei.
Published: 2020

21. Atomic transitions and the first ionization potential of promethium determined by laser spectroscopy

Author: Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, European Union (UE), Bundesministerium für Bildung und Forschung / Federal Ministry of Education and Research. Germany, Studer, Dominik, Heinitz, Stephan, Heinke, Reinhard, Naubereit, Pascal, Dressler, Rugard, Guerrero Sánchez, Carlos, Köster, Ulli, Schumann, Dorothea, Wendt, Klaus, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, European Union (UE), Bundesministerium für Bildung und Forschung / Federal Ministry of Education and Research. Germany, Studer, Dominik, Heinitz, Stephan, Heinke, Reinhard, Naubereit, Pascal, Dressler, Rugard, Guerrero Sánchez, Carlos, Köster, Ulli, Schumann, Dorothea, and Wendt, Klaus
Abstract: The atomic spectrum of neutral promethium has been studied extensively by laser resonance ionization spectroscopy. We report on more than 1000 atomic transitions in the blue and near infrared spectral ranges, most of them between high excited energy levels. As Rydberg convergences could not be assigned unambiguously in the dense spectrum at high excitation energies, the first ionization potential (IP) was determined via field ionization of weakly bound states within a static electric field. By applying the saddle-point model, a value of IP ( Pm ) = 45 020.8 ( 3 ) cm − 1 [ 5.58188 ( 4 ) eV ] was derived, which confirms previous expectations of 45 027 ( 80 ) and 44 985 ( 140 ) cm − 1 , which were obtained indirectly from lanthanide IP systematics.
Published: 2019

22. Isomer spectroscopy in Ba-133 and high-spin structure of Ba-134

Author: Federal Ministry of Education and Research (Germany), European Commission, Ministerio de Ciencia e Innovación (España), Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), Generalitat Valenciana, Kaya, L., Vogt, A., Reiter, P., Siciliano, M., Shimizu, N., Utsuno, Y., Wang, H. K., Gargano, A., Coraggio, L., Itaco, N., Arnswald, K., Bazzacco, D., Birkenbach, B., Blazhev, A., Bracco, A., Bruyneel, B., Corradi, L., Crespi, F.C.L., De Angelis, G., Droste, M., Eberth, J., Esmaylzadeh, A., Farnea, E., Fioretto, E., Fransen, C., Gadea, Andrés, Giaz, A., Görgen, A., Gottardo, A., Hadynska-Klek, K., Hess, H., Hirsch, R., John, P. R., Jolie, J., Jungclaus, Andrea, Karayonchev, V., Kornwebel, L., Korten, W., Leoni, S., Lewandowski, L., Lunardi, S., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatovic, T., Montagnoli, G., Montanari, D., Müller-Gatermann, C., Napoli, D., Podolyák, Zs., Pollarolo, G., Recchia, F., Régis, J.-M., Saed-Samii, N., Sahin, E., Scarlassara, F., Schomacker, K., Seidlitz, M., Siebeck, B., Söderström, P.-A., Stefanini, A. M., Stezowski, O., Szilner, S., Szpak, B., Teruya, E., Ur, C., Valiente-Dobón, J. J., Wolf, K., Yanase, K., Yoshinaga, N., Zell, K. O., Federal Ministry of Education and Research (Germany), European Commission, Ministerio de Ciencia e Innovación (España), Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), Generalitat Valenciana, Kaya, L., Vogt, A., Reiter, P., Siciliano, M., Shimizu, N., Utsuno, Y., Wang, H. K., Gargano, A., Coraggio, L., Itaco, N., Arnswald, K., Bazzacco, D., Birkenbach, B., Blazhev, A., Bracco, A., Bruyneel, B., Corradi, L., Crespi, F.C.L., De Angelis, G., Droste, M., Eberth, J., Esmaylzadeh, A., Farnea, E., Fioretto, E., Fransen, C., Gadea, Andrés, Giaz, A., Görgen, A., Gottardo, A., Hadynska-Klek, K., Hess, H., Hirsch, R., John, P. R., Jolie, J., Jungclaus, Andrea, Karayonchev, V., Kornwebel, L., Korten, W., Leoni, S., Lewandowski, L., Lunardi, S., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatovic, T., Montagnoli, G., Montanari, D., Müller-Gatermann, C., Napoli, D., Podolyák, Zs., Pollarolo, G., Recchia, F., Régis, J.-M., Saed-Samii, N., Sahin, E., Scarlassara, F., Schomacker, K., Seidlitz, M., Siebeck, B., Söderström, P.-A., Stefanini, A. M., Stezowski, O., Szilner, S., Szpak, B., Teruya, E., Ur, C., Valiente-Dobón, J. J., Wolf, K., Yanase, K., Yoshinaga, N., and Zell, K. O.
Abstract: The transitional nuclei Ba-134 and Ba-133 are investigated after multinucleon transfer employing the high-resolution Advanced GAmma Tracking Array coupled to the magnetic spectrometer PRISMA at the Laboratori Nazionali di Legnaro, Italy, and after fusion-evaporation reaction at the FN tandem accelerator of the University of Cologne, Germany. The J(pi) = 19/2(+) state at 1942 keV in Ba-133 is identified as an isomer with a half-life of 66.6(20) ns corresponding to a B(E1) value of 7.7(4) x 10(-6) e(2) fm(2) for the J(pi) = 19/2(+) to J(pi) = 19/2(-) transition. The level scheme of Ba-134 above the J(pi) = 10(+) isomer is extended to approximately 6 MeV. A pronounced backbending is observed at h omega = 0.38 MeV along the positive-parity yrast band. The results are compared to the high-spin systematics of the Z = 56 isotopes. Large-scale shell-model calculations employing the GCN50:82, SN100PN, SNV, PQM130, Realistic SM, and EPQQM interactions reproduce the experimental findings and elucidate the structure of the high-spin states. The shell-model calculations employing the GCN50:82 and PQM130 interactions reproduce alignment properties and provide detailed insight into the microscopic origin of this phenomenon in transitional Ba-134.
Published: 2019

23. Quasifree Neutron Knockout from Ca 54 Corroborates Arising N=34 Neutron Magic Number

Author: RIKEN Nishina Center for Accelerator-Based Science, Research Grants Council (Hong Kong), Japan Society for the Promotion of Science, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), German Research Foundation, Federal Ministry of Education and Research (Germany), Helmholtz Centre for Heavy Ion Research, Croatian Science Foundation, National Research Foundation of Korea, Science and Technology Facilities Council (UK), Chen, S., Lee, J., Doornenbal, P., Obertelli, A., Barbieri, C., Chazono, Y., Navrátil, P., Ogata, K., Otsuka, T., Raimondi, F., Somà, V., Utsuno, Y., Yoshida, K., Baba, H., Browne, F., Calvet, D., Château, F., Chiga, N., Corsi, A., Cortés, M.L., Delbart, A., Gheller, J.M., Giganon, A., Gillibert, A., Hilaire, C., Isobe, T., Kahlbow, J., Kobayashi, T., Kubota, Y., Lapoux, V., Liu, H. N., Motobayashi, T., Murray, I., Otsu, H., Panin, V., Paul, N., Rodriguez, W., Sakurai, H., Sasano, M., Steppenbeck, D., Stuhl, L., Sun, Y. L., Togano, Y., Uesaka, T., Wimmer, K., Yoneda, K., Achouri, N., Aktas, O., Aumann, T., Vaquero, Victor, RIKEN Nishina Center for Accelerator-Based Science, Research Grants Council (Hong Kong), Japan Society for the Promotion of Science, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), German Research Foundation, Federal Ministry of Education and Research (Germany), Helmholtz Centre for Heavy Ion Research, Croatian Science Foundation, National Research Foundation of Korea, Science and Technology Facilities Council (UK), Chen, S., Lee, J., Doornenbal, P., Obertelli, A., Barbieri, C., Chazono, Y., Navrátil, P., Ogata, K., Otsuka, T., Raimondi, F., Somà, V., Utsuno, Y., Yoshida, K., Baba, H., Browne, F., Calvet, D., Château, F., Chiga, N., Corsi, A., Cortés, M.L., Delbart, A., Gheller, J.M., Giganon, A., Gillibert, A., Hilaire, C., Isobe, T., Kahlbow, J., Kobayashi, T., Kubota, Y., Lapoux, V., Liu, H. N., Motobayashi, T., Murray, I., Otsu, H., Panin, V., Paul, N., Rodriguez, W., Sakurai, H., Sasano, M., Steppenbeck, D., Stuhl, L., Sun, Y. L., Togano, Y., Uesaka, T., Wimmer, K., Yoneda, K., Achouri, N., Aktas, O., Aumann, T., and Vaquero, Victor
Abstract: Exclusive cross sections and momentum distributions have been measured for quasifree one-neutron knockout reactions from a Ca54 beam striking on a liquid hydrogen target at ∼200 MeV/u. A significantly larger cross section to the p3/2 state compared to the f5/2 state observed in the excitation of Ca53 provides direct evidence for the nature of the N=34 shell closure. This finding corroborates the arising of a new shell closure in neutron-rich calcium isotopes. The distorted-wave impulse approximation reaction formalism with shell model calculations using the effective GXPF1Bs interaction and ab initio calculations concur our experimental findings. Obtained transverse and parallel momentum distributions demonstrate the sensitivity of quasifree one-neutron knockout in inverse kinematics on a thick liquid hydrogen target with the reaction vertex reconstructed to final state spin-parity assignments.
Published: 2019

24. Prominence of Pairing in Inclusive (p,2p) and (p,pn) Cross Sections from Neutron-Rich Nuclei

Author: RIKEN Nishina Center for Accelerator-Based Science, European Commission, Japan Society for the Promotion of Science, German Research Foundation, Alexander von Humboldt Foundation, Department of Energy (US), National Science Foundation (US), Xunta de Galicia, Federal Ministry of Education and Research (Germany), Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), National Natural Science Foundation of China, Chinese Academy of Sciences, Paul, N., Obertelli, A., Bertulani, C. A., Corsi, A., Doornenbal, P., Rodriguez-Sanchez, J. L., Authelet, G., Baba, H., Calvet, D., Château, F., Chen, S., Delbart, A., Gheller, J.M., Giganon, A., Gillibert, A., Isobe, T., Lapoux, V., Matsushita, M., Momiyama, S., Motobayashi, T., Niikura, M., Otsu, H., Péron, C., Peyaud, A., Pollacco, E.C., Roussé, J. Y., Sakurai, H., Santamaria, C., Sasano, M., Shiga, Y., Steppenbeck, D., Takeuchi, S., Taniuchi, R., Uesaka, T., Wang, H., Yoneda, K., Ando, T., Arici, T., Blazhev, A., Browne, F., Bruce, A.M., Carroll, R., Chung, L.X., Cortés, M.L., Dewald, M., Ding, B., Dombrádi, Zs., Flavigny, F., Franchoo, S., Jungclaus, Andrea, Vaquero, Victor, RIKEN Nishina Center for Accelerator-Based Science, European Commission, Japan Society for the Promotion of Science, German Research Foundation, Alexander von Humboldt Foundation, Department of Energy (US), National Science Foundation (US), Xunta de Galicia, Federal Ministry of Education and Research (Germany), Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), National Natural Science Foundation of China, Chinese Academy of Sciences, Paul, N., Obertelli, A., Bertulani, C. A., Corsi, A., Doornenbal, P., Rodriguez-Sanchez, J. L., Authelet, G., Baba, H., Calvet, D., Château, F., Chen, S., Delbart, A., Gheller, J.M., Giganon, A., Gillibert, A., Isobe, T., Lapoux, V., Matsushita, M., Momiyama, S., Motobayashi, T., Niikura, M., Otsu, H., Péron, C., Peyaud, A., Pollacco, E.C., Roussé, J. Y., Sakurai, H., Santamaria, C., Sasano, M., Shiga, Y., Steppenbeck, D., Takeuchi, S., Taniuchi, R., Uesaka, T., Wang, H., Yoneda, K., Ando, T., Arici, T., Blazhev, A., Browne, F., Bruce, A.M., Carroll, R., Chung, L.X., Cortés, M.L., Dewald, M., Ding, B., Dombrádi, Zs., Flavigny, F., Franchoo, S., Jungclaus, Andrea, and Vaquero, Victor
Abstract: Fifty-five inclusive single nucleon-removal cross sections from medium mass neutron-rich nuclei impinging on a hydrogen target at ∼250 MeV/nucleon are measured at the RIKEN Radioactive Isotope Beam Factory. Systematically higher cross sections are found for proton removal from nuclei with an even number of protons as compared to odd-proton number projectiles for a given neutron separation energy. Neutron removal cross sections display no even-odd splitting, contrary to nuclear cascade model predictions. Both effects are understood through simple considerations of neutron separation energies and bound state level densities originating in pairing correlations in the daughter nuclei. These conclusions are supported by comparison with semimicroscopic model predictions, highlighting the enhanced role of low-lying level densities in nucleon-removal cross sections from loosely bound nuclei.
Published: 2019

25. Modulated continuous wave control for energy-efficient electron-nuclear spin coupling

Author: Department of Energy (US), German Research Foundation, Federal Ministry of Education and Research (Germany), Comunidad de Madrid, Eusko Jaurlaritza, Ministerio de Economía y Competitividad (España), European Commission, European Research Council, Casanova, J., Torrontegui, E., Plenio, M.B., García-Ripoll, Juan José, Solano, E., Department of Energy (US), German Research Foundation, Federal Ministry of Education and Research (Germany), Comunidad de Madrid, Eusko Jaurlaritza, Ministerio de Economía y Competitividad (España), European Commission, European Research Council, Casanova, J., Torrontegui, E., Plenio, M.B., García-Ripoll, Juan José, and Solano, E.
Abstract: We develop energy efficient, continuous microwave schemes to couple electron and nuclear spins, using phase or amplitude modulation to bridge their frequency difference. These controls have promising applications in biological systems, where microwave power should be limited, as well as in situations with high Larmor frequencies due to large magnetic fields and nuclear magnetic moments. These include nanoscale NMR where high magnetic fields achieves enhanced thermal nuclear polarization and larger chemical shifts. Our controls are also suitable for quantum information processors and nuclear polarization schemes.
Published: 2019

26. Strong Neutron Pairing in core+4n Nuclei

Author: Technische Universität Darmstadt, Federal Ministry of Education and Research (Germany), National Science Foundation (US), Department of Energy (US), Revel, A., Marqués, F. M., Sorlin, O., Aumann, T., Caesar, C., Holl, M., Panin, V., Vandebrouck, M., Wamers, F., Álvarez-Pol, H., Atar, L., Velho, P., Volkov, V., Wagner, A., Weick, H., Wheldon, C., Wilson, G., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., Zuber, K., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boillos, J. M., Boretzky, K., García Borge, María José, Caamaño, M., Casarejos, E., Catford, W.N., Cederkäll, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Datta Pramanik, U., Díaz Fernández, P., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, Luis M., Freer, M., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Hufnagel, A., Ignatov, A., Johansson, H.T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kröll, T., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec, J., Movsesyan, A., Nácher, Enrique, Najafi, M., Nikolskii, E., Nilsson, T., Nociforo, C., Paschalis, S., Perea, Ángel, Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, Guillermo, Rigollet, C., Röder, M., Rossi, D., Savran, D., Scheit, H., Simon, H., Syndikus, I., Taylor, J. T., Tengblad, Olof, Thies, R., Togano, Y., Technische Universität Darmstadt, Federal Ministry of Education and Research (Germany), National Science Foundation (US), Department of Energy (US), Revel, A., Marqués, F. M., Sorlin, O., Aumann, T., Caesar, C., Holl, M., Panin, V., Vandebrouck, M., Wamers, F., Álvarez-Pol, H., Atar, L., Velho, P., Volkov, V., Wagner, A., Weick, H., Wheldon, C., Wilson, G., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., Zuber, K., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boillos, J. M., Boretzky, K., García Borge, María José, Caamaño, M., Casarejos, E., Catford, W.N., Cederkäll, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Datta Pramanik, U., Díaz Fernández, P., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, Luis M., Freer, M., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Hufnagel, A., Ignatov, A., Johansson, H.T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kröll, T., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec, J., Movsesyan, A., Nácher, Enrique, Najafi, M., Nikolskii, E., Nilsson, T., Nociforo, C., Paschalis, S., Perea, Ángel, Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, Guillermo, Rigollet, C., Röder, M., Rossi, D., Savran, D., Scheit, H., Simon, H., Syndikus, I., Taylor, J. T., Tengblad, Olof, Thies, R., and Togano, Y.
Abstract: The emission of neutron pairs from the neutron-rich N = 12 isotones C-18 and O-20 has been studied by high-energy nucleon knockout from N-19 and O-21 secondary beams, populating unbound states of the two isotones up to 15 MeV above their two-neutron emission thresholds. The analysis of triple fragment-n-n correlations shows that the decay N-19(-1p)18C*-> C-16 + n + n is clearly dominated by direct pair emission. The two- neutron correlation strength, the largest ever observed, suggests the predominance of a C-14 core surrounded by four valence neutrons arranged in strongly correlated pairs. On the other hand, a significant competition of a sequential branch is found in the decay O-21(-1n)O-20*-> O-18 + n + n, attributed to its formation through the knockout of a deeply bound neutron that breaks the O-16 core and reduces the number of pairs.
Published: 2018

27. First Accurate Normalization of the beta-delayed alpha Decay of N-16 and Implications for the C-12(alpha,gamma)O-16 Astrophysical Reaction Rate.

Author: European Commission, Ministerio de Economía y Competitividad (España), Institute of Atomic Physics (Romania), Science and Technology Facilities Council (UK), European Research Council, Federal Ministry of Education and Research (Germany), Royal Society of Arts and Sciences in Gothenburg, Villum Fonden, Research Foundation - Flanders, SCOAP, Kirsebom, O.S., Tengblad, Olof, Lică, R., Munch, M., Riisager, K., Fynbo, H.O.U., García Borge, María José, Madurga, Miguel, Marroquín, I., Andreyev, A. N., Berry, T. A., Christensen, E. R., Díaz Fernández, P., Doherty, D.T., Van Duppen, P., Fraile, Luis M., Gallardo, M. C., Greenlees, P.T., Harkness-Brennan, L.J., Hubbard, N., Huyse, M., Jensen. J. H., Johansson, H., Jonson, B., Judson, D.S., Konki, J., Lazarus, I., Lund, M. V., Marginean, N., Marginean, R., Perea, Ángel, Mihai, C., Negret, A., Page, R.D., Pucknell, V., Rahkila, P., Sorlin, O., Sotty, C., Swartz, J. A., Sørensen, H. B., Törnqvist, H., Vedia, V., Warr, N., Witte, H. de, European Commission, Ministerio de Economía y Competitividad (España), Institute of Atomic Physics (Romania), Science and Technology Facilities Council (UK), European Research Council, Federal Ministry of Education and Research (Germany), Royal Society of Arts and Sciences in Gothenburg, Villum Fonden, Research Foundation - Flanders, SCOAP, Kirsebom, O.S., Tengblad, Olof, Lică, R., Munch, M., Riisager, K., Fynbo, H.O.U., García Borge, María José, Madurga, Miguel, Marroquín, I., Andreyev, A. N., Berry, T. A., Christensen, E. R., Díaz Fernández, P., Doherty, D.T., Van Duppen, P., Fraile, Luis M., Gallardo, M. C., Greenlees, P.T., Harkness-Brennan, L.J., Hubbard, N., Huyse, M., Jensen. J. H., Johansson, H., Jonson, B., Judson, D.S., Konki, J., Lazarus, I., Lund, M. V., Marginean, N., Marginean, R., Perea, Ángel, Mihai, C., Negret, A., Page, R.D., Pucknell, V., Rahkila, P., Sorlin, O., Sotty, C., Swartz, J. A., Sørensen, H. B., Törnqvist, H., Vedia, V., Warr, N., and Witte, H. de
Abstract: The C-12(alpha,gamma)O-16 reaction plays a central role in astrophysics, but its cross section at energies relevant for astrophysical applications is only poorly constrained by laboratory data. The reduced a width, gamma(11), of the bound 1(-) level in O-16 is particularly important to determine the cross section. The magnitude of gamma(11) is determined via sub-Coulomb a-transfer reactions or the beta-delayed a decay of N-16, but the latter approach is presently hampered by the lack of sufficiently precise data on the beta-decay branching ratios. Here we report improved branching ratios for the bound 1(-) level [b(beta,11) = (5.02 +/- 0.10) x 10(-2)] and for beta-delayed alpha emission [b(beta alpha) = (1.59 +/- 0.06) x 10(-5)]. Our value for b(beta alpha) is 33% larger than previously held, leading to a substantial increase in gamma(11). Our revised value for gamma(11) is in good agreement with the value obtained in a-transfer studies and the weighted average of the two gives a robust and precise determination of gamma(11), which provides significantly improved constraints on the C-12(alpha,gamma) cross section in the energy range relevant to hydrostatic He burning.
Published: 2018

28. Enhanced Quadrupole and Octupole Strength in Doubly Magic Sn-132

Author: Agencia Estatal de Investigación (España), Ministerio de Economía, Industria y Competitividad (España), Research Foundation - Flanders, Bonn-Cologne Graduate School of Physics and Astronomy, Academy of Finland, Bulgarian National Science Fund, RIKEN Nishina Center for Accelerator-Based Science, Ministry of Education, Culture, Sports, Science and Technology (Japan), Belgian Science Policy Office, European Commission, Federal Ministry of Education and Research (Germany), Rosiak, D., Seidlitz, M., Reiter, P., Tsunoda, Y., Naïdja, H., Togashi, T., Nowacki, F., Otsuka, T., Coló, Georgina P., Arnswald, K., Berry, T., Blazhev, A., García Borge, María José, Cederkäll, J., Cox, D.M., Witte, H. de, Gaffney, L.P., Henrich, C., Hirsch, R., Huyse, M., Illana, A., Johnston, K., Kaya, L., Kröll, Th., Lozano Benito, M. L., Ojala, J., Pakarinen, J., Queiser, M., Rainovski, G., Rodríguez, J. A., Siebeck, B., Siesling, E., Snäll, J., Van Duppen, P., Vogt, A., Schmid, M. von, Warr, N., Wenander, F., Zell, K. O., Agencia Estatal de Investigación (España), Ministerio de Economía, Industria y Competitividad (España), Research Foundation - Flanders, Bonn-Cologne Graduate School of Physics and Astronomy, Academy of Finland, Bulgarian National Science Fund, RIKEN Nishina Center for Accelerator-Based Science, Ministry of Education, Culture, Sports, Science and Technology (Japan), Belgian Science Policy Office, European Commission, Federal Ministry of Education and Research (Germany), Rosiak, D., Seidlitz, M., Reiter, P., Tsunoda, Y., Naïdja, H., Togashi, T., Nowacki, F., Otsuka, T., Coló, Georgina P., Arnswald, K., Berry, T., Blazhev, A., García Borge, María José, Cederkäll, J., Cox, D.M., Witte, H. de, Gaffney, L.P., Henrich, C., Hirsch, R., Huyse, M., Illana, A., Johnston, K., Kaya, L., Kröll, Th., Lozano Benito, M. L., Ojala, J., Pakarinen, J., Queiser, M., Rainovski, G., Rodríguez, J. A., Siebeck, B., Siesling, E., Snäll, J., Van Duppen, P., Vogt, A., Schmid, M. von, Warr, N., Wenander, F., and Zell, K. O.
Abstract: The first 2(+) and 3(-) states of the doubly magic nucleus Sn-132 are populated via safe Coulomb excitation employing the recently commissioned HIE-ISOLDE accelerator at CERN in conjunction with the highly efficient MINIBALL array. The Sn-132 ions are accelerated to an energy of 5.49 MeV/nucleon and impinged on a Pb-206 target. Deexciting gamma rays from the low-lying excited states of the target and the projectile are recorded in coincidence with scattered particles. The reduced transition strengths are determined for the transitions 0(g.s)(+) -> 2(1)(+), 0(g.s)(+) -> 3(1)(-), and 2(1)(+) -> 3(1)(-) in Sn-132. The results on these states provide crucial information on cross-shell configurations which are determined within large-scale shell-model and Monte Carlo shell-model calculations as well as from random-phase approximation and relativistic random-phase approximation. The locally enhanced B(E2; 0(g.s)(+) -> 2(1)(+)) strength is consistent with the microscopic description of the structure of the respective states within all theoretical approaches. The presented results of experiment and theory can be considered to be the first direct verification of the sphericity and double magicity of Sn-132.
Published: 2018

29. Quasifree (p, 2p) Reactions on Oxygen Isotopes: Observation of Isospin Independence of the Reduced Single-Particle Strength.

Author: Helmholtz Centre for Heavy Ion Research, Department of Energy (US), National Science Foundation (US), Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), University of Leicester, Atar, L., Paschalis, S., Barbieri, C., Bertulani, C. A., Díaz Fernández, P., Holl, M., Najafi, M.A., Panin, V., Álvarez-Pol, H., Aumann, T., Avdeichikov, V., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., Zuber, K., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Boillos, J. M., Boretzky, K., García Borge, María José, Caamaño, M., Caesar, C., Casarejos, E., Catford, W.N., Cederkall, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, Luis M., Freer, M., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Hufnagel, A., Ignatov, A., Johansson, H.T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kröll, T., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec-Galazka, J., Movsesyan, A., Nácher, Enrique, Nikolskii, E. Y., Nilsson, T., Nociforo, C., Perea, Ángel, Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, Guillermo, Rigollet, C., Rossi, D. M., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I., Taylor, J. T., Tengblad, Olof, Thies, R., Togano, Y., Vandebrouck, M., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Wheldon, C., Wilson, G. L., Winfield, J. S., Helmholtz Centre for Heavy Ion Research, Department of Energy (US), National Science Foundation (US), Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), University of Leicester, Atar, L., Paschalis, S., Barbieri, C., Bertulani, C. A., Díaz Fernández, P., Holl, M., Najafi, M.A., Panin, V., Álvarez-Pol, H., Aumann, T., Avdeichikov, V., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., Zuber, K., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Boillos, J. M., Boretzky, K., García Borge, María José, Caamaño, M., Caesar, C., Casarejos, E., Catford, W.N., Cederkall, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, Luis M., Freer, M., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Hufnagel, A., Ignatov, A., Johansson, H.T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kröll, T., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec-Galazka, J., Movsesyan, A., Nácher, Enrique, Nikolskii, E. Y., Nilsson, T., Nociforo, C., Perea, Ángel, Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, Guillermo, Rigollet, C., Rossi, D. M., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I., Taylor, J. T., Tengblad, Olof, Thies, R., Togano, Y., Vandebrouck, M., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Wheldon, C., Wilson, G. L., and Winfield, J. S.
Abstract: Quasifree one-proton knockout reactions have been employed in inverse kinematics for a systematic study of the structure of stable and exotic oxygen isotopes at the (RB)-B-3/LAND setup with incident beam energies in the range of 300-450 MeV/u. The oxygen isotopic chain offers a large variation of separation energies that allows for a quantitative understanding of single-particle strength with changing isospin asymmetry. Quasifree knockout reactions provide a complementary approach to intermediate-energy one-nucleon removal reactions. Inclusive cross sections for quasifree knockout reactions of the type O-A(p,2p)NA-1 have been determined and compared to calculations based on the eikonal reaction theory. The reduction factors for the single-particle strength with respect to the independent-particle model were obtained and compared to state-of-the-art ab initio predictions. The results do not show any significant dependence on proton-neutron asymmetry.
Published: 2018

30. Beta decays of the heaviest N = Z - l nuclei and proton instability of In-97.

Author: German Research Foundation, Federal Ministry of Education and Research (Germany), Ministerio de Economía y Competitividad (España), Natural Sciences and Engineering Research Council of Canada, French-Japanese International Associated Laboratory for Nuclear Structure Problems, National Research Foundation of Korea, Ministry of Education, Science and Technology (South Korea), University of Tokyo, RIKEN Nishina Center for Accelerator-Based Science, Japan Society for the Promotion of Science, Park, J., Krücken, R., Lubos, D., Gernhäuser, R., Lewitowicz, M., Nishimura, S., Ahn, D.S., Baba, H., Blank, B., Blazhev, A., Boutachkov, P., Browne, F., Celikovic, I., France, G. de, Doornenbal, P., Faestermann, T., Fang, Y., Fukuda, N., Giovinazzo, J., Goel, N., Górska, M., Grawe, H., Ilieva, S., Inabe, N., Isobe, T., Jungclaus, Andrea, Kameda, D., Kim, G. D., Kim, Y. K., Kojouharov, I., Kubo, T., Kurz, N., Lorusso, G., Moschner, K., Murai, D., Nishizuka, I., Patel, Z., Rajabali, M., Rice, S., Sakurai, H., Schaffner, H., Shimizu, Y., Sinclair, L., Söderström, P.-A., Steiger, K., Sumikama, T., Suzuki, H., Takeda, H., Wang, Z., Watanabe, H., Wu, J., Xu, Z. Y., German Research Foundation, Federal Ministry of Education and Research (Germany), Ministerio de Economía y Competitividad (España), Natural Sciences and Engineering Research Council of Canada, French-Japanese International Associated Laboratory for Nuclear Structure Problems, National Research Foundation of Korea, Ministry of Education, Science and Technology (South Korea), University of Tokyo, RIKEN Nishina Center for Accelerator-Based Science, Japan Society for the Promotion of Science, Park, J., Krücken, R., Lubos, D., Gernhäuser, R., Lewitowicz, M., Nishimura, S., Ahn, D.S., Baba, H., Blank, B., Blazhev, A., Boutachkov, P., Browne, F., Celikovic, I., France, G. de, Doornenbal, P., Faestermann, T., Fang, Y., Fukuda, N., Giovinazzo, J., Goel, N., Górska, M., Grawe, H., Ilieva, S., Inabe, N., Isobe, T., Jungclaus, Andrea, Kameda, D., Kim, G. D., Kim, Y. K., Kojouharov, I., Kubo, T., Kurz, N., Lorusso, G., Moschner, K., Murai, D., Nishizuka, I., Patel, Z., Rajabali, M., Rice, S., Sakurai, H., Schaffner, H., Shimizu, Y., Sinclair, L., Söderström, P.-A., Steiger, K., Sumikama, T., Suzuki, H., Takeda, H., Wang, Z., Watanabe, H., Wu, J., and Xu, Z. Y.
Abstract: We report on new or more precise half-lives, beta-decay endpoint energies, and beta-delayed proton emission branching ratios of(91) Pd, Cd-95,In-97, and Sn-99. The measured values are consistent with known mirror transitions in lighter T-z = -1/2 nuclei, shell-model calculations, and various mass models. In addition to the beta -decaying (9/2(+)) ground state, circumstantial evidence for a short-lived, proton-emitting isomer with spin (1 /2(-)) was found in(97)In. Based on the experimental data, a semiempirical theory on proton emission, and shell-model calculations, the proton separation energy of the In-97 ground state was determined to be -0.10 +/- 0.19 MeV. The existence of the short-lived, proton-unstable (1 /2(-)) isomer in In-97 establishes Cd-9S as an rp-process waiting point.
Published: 2018

31. Evolution of deformation in neutron-rich Ba isotopes up to A=150.

Author: Belgian Science Policy Office, Research Foundation - Flanders, Federal Ministry of Education and Research (Germany), Ministerio de Economía y Competitividad (España), Institute of Atomic Physics (Romania), Istituto Nazionale di Fisica Nucleare, European Commission, SCOAP, Lică, R., Benzoni, G., Rodríguez, T. R., García Borge, María José, Fraile, Luis M., Mach, H., Morales, Ana Isabel, Madurga, Miguel, Sotty, C. O., Vedia, V., Witte, H. de, Benito, J., Bernard, R. N., Berry, T., Bracco, A., Camera, F., Ceruti, S., Charviakova, V., Cieplicka, N., Costache, C., Crespi, F.C.L., Creswell, J., Fernández-Martínez, G., Fynbo, H., Greenlees, P.T., Homm, I., Huyse, M., Jolie, J., Karayonchev, V., Köster, U., Konki, J., Kröll, T., Kurcewicz, J., Kurtukian-Nieto, T., Lazarus, I, Lund, M. V., Marginean, N., Marginean, R., Mihai, C., Mihai, R.E., Negret, A., Orduz, A., Patyk, Z., Pascu, S., Pucknell, V., Rahkila, P., Rapisarda, E., Regis, J. M., Robledo, Luis Miguel, Rotaru, F., Saed-Samii, N., Sánchez-Tembleque, V., Stanoiu, M., Thuerauf, M., Turturica, A., Van Duppen, P., Warr, N., Tengblad, Olof, Belgian Science Policy Office, Research Foundation - Flanders, Federal Ministry of Education and Research (Germany), Ministerio de Economía y Competitividad (España), Institute of Atomic Physics (Romania), Istituto Nazionale di Fisica Nucleare, European Commission, SCOAP, Lică, R., Benzoni, G., Rodríguez, T. R., García Borge, María José, Fraile, Luis M., Mach, H., Morales, Ana Isabel, Madurga, Miguel, Sotty, C. O., Vedia, V., Witte, H. de, Benito, J., Bernard, R. N., Berry, T., Bracco, A., Camera, F., Ceruti, S., Charviakova, V., Cieplicka, N., Costache, C., Crespi, F.C.L., Creswell, J., Fernández-Martínez, G., Fynbo, H., Greenlees, P.T., Homm, I., Huyse, M., Jolie, J., Karayonchev, V., Köster, U., Konki, J., Kröll, T., Kurcewicz, J., Kurtukian-Nieto, T., Lazarus, I, Lund, M. V., Marginean, N., Marginean, R., Mihai, C., Mihai, R.E., Negret, A., Orduz, A., Patyk, Z., Pascu, S., Pucknell, V., Rahkila, P., Rapisarda, E., Regis, J. M., Robledo, Luis Miguel, Rotaru, F., Saed-Samii, N., Sánchez-Tembleque, V., Stanoiu, M., Thuerauf, M., Turturica, A., Van Duppen, P., Warr, N., and Tengblad, Olof
Abstract: The occurrence of octupolar shapes in the Ba isotopic chain was recently established experimentally up to N = 90. To further extend the systematics, the evolution of shapes in the most neutron-rich members of the Z = 56 isotopic chain accessible at present, Ba-148,Ba-150, has been studied via beta decay at the ISOLDE Decay Station. This paper reports on the first measurement of the positive-and negative-parity low-spin excited states of 150Ba and presents an extension of the beta-decay scheme of Cs-148. Employing the fast timing technique, half-lives for the 2(1)(+) level in both nuclei have been determined, resulting in T-1/2 = 1.51(1) ns for Ba-148 and T-1/2 = 3.4(2) ns for Ba-150. The systematics of low-spin states, together with the experimental determination of the B(E2 : 2(+) -> 0(+)) transition probabilities, indicate an increasing collectivity in Ba148-150, towards prolate deformed shapes. The experimental data are compared to symmetry conserving configuration mixing (SCCM) calculations, confirming an evolution of increasingly quadrupole deformed shapes with a definite octupolar character.
Published: 2018

32. Shrinking of rapidly evaporating water microdroplets reveals their extreme supercooling

Author: Federal Ministry of Education and Research (Germany), Goy, Claudia, Potenza, Marco A. C., Dedera, Sebastian, Tomut, Marilena, Guillerm, Emmanuel, Kalinin, Anton, Voss, Kay-Obbe, Schottelius, Alexander, Petridis, Nikolao, Prosvetov, Alexey, Tejeda, Guzmán, Fernández Sánchez, José María, Trautmann, C., Caupin, Frédéric, Glasmacher, Ulrich, Grisenti, Robert E., Federal Ministry of Education and Research (Germany), Goy, Claudia, Potenza, Marco A. C., Dedera, Sebastian, Tomut, Marilena, Guillerm, Emmanuel, Kalinin, Anton, Voss, Kay-Obbe, Schottelius, Alexander, Petridis, Nikolao, Prosvetov, Alexey, Tejeda, Guzmán, Fernández Sánchez, José María, Trautmann, C., Caupin, Frédéric, Glasmacher, Ulrich, and Grisenti, Robert E.
Abstract: The fast evaporative cooling ofmicrometer-sizedwater droplets in a vacuumoffers the appealing possibility to investigate supercooled water—below the melting point but still a liquid—at temperatures far beyond the state of the art. However, it is challenging to obtain a reliable value of the droplet temperature under such extreme experimental conditions. Here, the observation of morphology-dependent resonances in the Raman scattering from a train of perfectly uniform water droplets allows us to measure the variation in droplet size resulting from evaporative mass losses with an absolute precision of better than 0.2%. This finding proves crucial to an unambiguous determination of the droplet temperature. In particular, we find that a fraction of water droplets with an initial diameter of 6379 12 nm remain liquid down to 230.6 0.6 K. Our results question temperature estimates reported recently for larger supercooled water droplets and provide valuable information on the hydrogen-bond network in liquid water in the hard-to-access deeply supercooled regime.
Published: 2018

33. Comparison of electromagnetic and nuclear dissociation of Ne-17.

Author: Department of Energy (US), National Science Foundation (US), German Research Foundation, Federal Ministry of Education and Research (Germany), European Money Markets Institute, Helmholtz International Center for FAIR, Technische Universität Darmstadt, Ministerio de Economía y Competitividad (España), Wamers, F., Marganiec, J., Aksouh, F., Aksyutina, Yu., Álvarez-Pol, H., Aumann, T., Beceiro Novo, S., Bertulani, C. A., Boretzky, K., García Borge, María José, Chartier, M., Chatillon, A., Chulkov, L. V., Cortina-Gil, D., Emling, H., Ershova, O., Fraile, Luis M., Fynbo, H.O.U., Galaviz, D., Geissel, H., Heil, M., Hoffmann, D.H.H., Hoffman, J., Johansson, H.T., Jonson, B., Karagiannis, C., Kiselev, O. A., Kratz, J. V., Kulessa, R., Kurz, N., Langer, C., Lantz, M., Le Bleis, T., Lehr, C., Lemmon, R., Litvinov, Yu. A., Mahata, K., Müntz, C., Nilsson, T., Nociforo, C., Ott, W., Panin, V., Paschalis, S., Perea, Ángel, Plag, R., Reifarth, R., Richter, A., Riisager, K., Rodríguez-Tajes, C., Rossi, D., Savran, D., Schrieder, G., Simon, H., Stroth, J., Sümmerer, K., Tengblad, Olof, Typel, S., Weick, H., Wiescher, M., Wimmer, C., Department of Energy (US), National Science Foundation (US), German Research Foundation, Federal Ministry of Education and Research (Germany), European Money Markets Institute, Helmholtz International Center for FAIR, Technische Universität Darmstadt, Ministerio de Economía y Competitividad (España), Wamers, F., Marganiec, J., Aksouh, F., Aksyutina, Yu., Álvarez-Pol, H., Aumann, T., Beceiro Novo, S., Bertulani, C. A., Boretzky, K., García Borge, María José, Chartier, M., Chatillon, A., Chulkov, L. V., Cortina-Gil, D., Emling, H., Ershova, O., Fraile, Luis M., Fynbo, H.O.U., Galaviz, D., Geissel, H., Heil, M., Hoffmann, D.H.H., Hoffman, J., Johansson, H.T., Jonson, B., Karagiannis, C., Kiselev, O. A., Kratz, J. V., Kulessa, R., Kurz, N., Langer, C., Lantz, M., Le Bleis, T., Lehr, C., Lemmon, R., Litvinov, Yu. A., Mahata, K., Müntz, C., Nilsson, T., Nociforo, C., Ott, W., Panin, V., Paschalis, S., Perea, Ángel, Plag, R., Reifarth, R., Richter, A., Riisager, K., Rodríguez-Tajes, C., Rossi, D., Savran, D., Schrieder, G., Simon, H., Stroth, J., Sümmerer, K., Tengblad, Olof, Typel, S., Weick, H., Wiescher, M., and Wimmer, C.
Abstract: The Borromean drip-line nucleus Ne-17 has been suggested to possess a two-proton halo structure in its ground state. In the astrophysical rp-process, where the two-proton capture reaction O-15(2p,gamma) Ne-17 plays an important role, the calculated reaction rate differs by several orders of magnitude between different theoretical approaches. To add to the understanding of the Ne-17 structure we have studied nuclear and electromagnetic dissociation. A 500 MeV/u Ne-17 beam was directed toward lead, carbon, and polyethylene targets. Oxygen isotopes in the final state were measured in coincidence with one or two protons. Different reaction branches in the dissociation of Ne-17 were disentangled. The relative populations of s and d states in F-16 were determined for light and heavy targets. The differential cross section for electromagnetic dissociation (EMD) shows a continuous internal energy spectrum in the three-body system O-15 + 2p. The Ne-17 EMD data were compared to current theoretical models. None of them, however, yields satisfactory agreement with the experimental data presented here. These new data may facilitate future development of adequate models for description of the fragmentation process.
Published: 2018

34. Instability of the topological surface state in Bi2Se3 upon deposition of gold

Author: Ministerio de Economía y Competitividad (España), Ministerio de Ciencia e Innovación (España), German Research Foundation, European Research Council, Eusko Jaurlaritza, Tomsk State University, Saint Petersburg State University, Federal Ministry of Education and Research (Germany), Natural Sciences and Engineering Research Council of Canada, Simon Fraser University, Department of Energy (US), European Commission, Polyakov, A., Tusche, C., Ellguth, M., Crozier, E.D., Mohseni, K., Otrokov, M. M., Zubizarreta, X., Vergniory, Maia G., Geilhufe, M., Chulkov, Eugene V., Ernst, Arthur, Meyerheim, Holger L., Parkin, S. S. P., Ministerio de Economía y Competitividad (España), Ministerio de Ciencia e Innovación (España), German Research Foundation, European Research Council, Eusko Jaurlaritza, Tomsk State University, Saint Petersburg State University, Federal Ministry of Education and Research (Germany), Natural Sciences and Engineering Research Council of Canada, Simon Fraser University, Department of Energy (US), European Commission, Polyakov, A., Tusche, C., Ellguth, M., Crozier, E.D., Mohseni, K., Otrokov, M. M., Zubizarreta, X., Vergniory, Maia G., Geilhufe, M., Chulkov, Eugene V., Ernst, Arthur, Meyerheim, Holger L., and Parkin, S. S. P.
Abstract: Momentum-resolved photoemission spectroscopy indicates the instability of the Dirac surface state upon deposition of gold on the (0001) surface of the topological insulator Bi2Se3. Based on the structure model derived from extended x-ray absorption fine structure experiments showing that gold atoms substitute bismuth atoms, first-principles calculations provide evidence that a gap appears due to hybridization of the surface state with gold d states near the Fermi level. Our findings provide insights into the mechanisms affecting the stability of the surface state.
Published: 2017

35. Effective proton-neutron interaction near the drip line from unbound states in F-25,F-26

Author: National Research Council of Canada, Natural Sciences and Engineering Research Council of Canada, National Science Foundation (US), European Research Council, European Commission, German Research Foundation, Federal Ministry of Education and Research (Germany), Ministerio de Economía y Competitividad (España), Fundação para a Ciência e a Tecnologia (Portugal), Ohio Supercomputer Center, Michigan State University, Helmholtz International Center for FAIR, State of Hesse, Department of Energy (US), Vandebrouck, M., Lepailleur, A., Álvarez-Pol, H., Benlliure, J., Boillos, J. M., García Borge, María José, Caamaño, M., Casarejos, E., Cortina-Gil, D., Fraile, Luis M., Galaviz, D., Nácher, Enrique, Perea, Ángel, Ribeiro, Guillermo, Tengblad, Olof, Zuber, K., National Research Council of Canada, Natural Sciences and Engineering Research Council of Canada, National Science Foundation (US), European Research Council, European Commission, German Research Foundation, Federal Ministry of Education and Research (Germany), Ministerio de Economía y Competitividad (España), Fundação para a Ciência e a Tecnologia (Portugal), Ohio Supercomputer Center, Michigan State University, Helmholtz International Center for FAIR, State of Hesse, Department of Energy (US), Vandebrouck, M., Lepailleur, A., Álvarez-Pol, H., Benlliure, J., Boillos, J. M., García Borge, María José, Caamaño, M., Casarejos, E., Cortina-Gil, D., Fraile, Luis M., Galaviz, D., Nácher, Enrique, Perea, Ángel, Ribeiro, Guillermo, Tengblad, Olof, and Zuber, K.
Abstract: Background: Odd-odd nuclei, around doubly closed shells, have been extensively used to study proton-neutron interactions. However, the evolution of these interactions as a function of the binding energy, ultimately when nuclei become unbound, is poorly known. The F-26 nucleus, composed of a deeply bound pi 0d(5/2) proton and an unbound v0d(3/2) neutron on top of an O-24 core, is particularly adapted for this purpose. The coupling of this proton and neutron results in a J(pi) = 1(1)(+) - 4(1)(+) multiplet, whose energies must be determined to study the influence of the proximity of the continuum on the corresponding proton-neutron interaction. The J(pi) = 1(1)(+), 2(1)(+), 4(1)(+) bound states have been determined, and only a clear identification of the J(pi) = 3(1)(+) is missing. Purpose: We wish to complete the study of the J(pi) = 1(1)(+) - 4(1)(+) multiplet in F-26, by studying the energy and width of the J(pi) = 3(1)(+) unbound state. The method was first validated by the study of unbound states in F-25, for which resonances were already observed in a previous experiment. Method: Radioactive beams of Ne-26 and Ne-27, produced at about 440AMeV by the fragment separator at the GSI facility were used to populate unbound states in F-25 and F-26 via one-proton knockout reactions on a CH2 target, located at the object focal point of the (RB)-B-3/LAND setup. The detection of emitted. rays and neutrons, added to the reconstruction of the momentum vector of the A - 1 nuclei, allowed the determination of the energy of three unbound states in F-25 and two in F-26. Results: Based on its width and decay properties, the first unbound state in F-25, at the relative energy of 49(9) keV, is proposed to be a J(pi) = 1/ 2(-) arising from a p1/2 proton- hole state. In F-26, the first resonance at 323(33) keV is proposed to be the J(pi) = 3(1)(+) member of the J(pi) = 1(1)(+) - 4(1)(+) multiplet. Energies of observed states in F-25,F-26 have been compared to calculations using the i
Published: 2017

36. Systematic investigation of projectile fragmentation using beams of unstable B and C isotopes

Author: Federal Ministry of Education and Research (Germany), Nuclear Astrophysics Virtual Institute (Germany), Helmholtz Association, Science and Technology Facilities Council (UK), Department of Energy (US), Ministerio de Economía y Competitividad (España), Swedish Research Council, Helmholtz Centre for Heavy Ion Research, National Science Foundation (US), Thies, R., Alcantara-Núñes, J., Álvarez-Pol, H., Benlliure, J., García Borge, María José, Casarejos, E., Fraile, Luis M., Perea, Ángel, Ribeiro, Guillermo, Sánchez del Río, José, Tengblad, Olof, Federal Ministry of Education and Research (Germany), Nuclear Astrophysics Virtual Institute (Germany), Helmholtz Association, Science and Technology Facilities Council (UK), Department of Energy (US), Ministerio de Economía y Competitividad (España), Swedish Research Council, Helmholtz Centre for Heavy Ion Research, National Science Foundation (US), Thies, R., Alcantara-Núñes, J., Álvarez-Pol, H., Benlliure, J., García Borge, María José, Casarejos, E., Fraile, Luis M., Perea, Ángel, Ribeiro, Guillermo, Sánchez del Río, José, and Tengblad, Olof
Abstract: Background: Models describing nuclear fragmentation and fragmentation fission deliver important input for planning nuclear physics experiments and future radioactive ion beam facilities. These models are usually benchmarked against data from stable beam experiments. In the future, two-step fragmentation reactions with exotic nuclei as stepping stones are a promising tool for reaching the most neutron-rich nuclei, creating a need for models to describe also these reactions. Purpose: We want to extend the presently available data on fragmentation reactions towards the light exotic region on the nuclear chart. Furthermore, we want to improve the understanding of projectile fragmentation especially for unstable isotopes. Method: We have measured projectile fragments from C10,12-18 and B10-15 isotopes colliding with a carbon target. These measurements were all performed within one experiment, which gives rise to a very consistent data set. We compare our data to model calculations. Results: One-proton removal cross sections with different final neutron numbers (1pxn) for relativistic C10,12-18 and B10-15 isotopes impinging on a carbon target. Comparing model calculations to the data, we find that the epax code is not able to describe the data satisfactorily. Using abrabla07 on the other hand, we find that the average excitation energy per abraded nucleon needs to be decreased from 27 MeV to 8.1 MeV. With that decrease abrabla07 describes the data surprisingly well. Conclusions: Extending the available data towards light unstable nuclei with a consistent set of new data has allowed a systematic investigation of the role of the excitation energy induced in projectile fragmentation. Most striking is the apparent mass dependence of the average excitation energy per abraded nucleon. Nevertheless, this parameter, which has been related to final-state interactions, requires further study. ©2016 American Physical Society
Published: 2016

37. Superdeformed and Triaxial States in Ca 42

Author: European Commission, Federal Ministry of Education and Research (Germany), National Science Centre (Poland), Generalitat Valenciana, Nuclear Astrophysics Virtual Institute (Germany), Helmholtz Association, Ministerio de Economía y Competitividad (España), Research Council of Norway, Laboratori Nazionali di Legnaro, Helmholtz Centre for Heavy Ion Research, University of Warsaw, Hadynska-Klek, K., Rodríguez, T. R., Gadea, Andrés, Jungclaus, Andrea, Quintana, B., European Commission, Federal Ministry of Education and Research (Germany), National Science Centre (Poland), Generalitat Valenciana, Nuclear Astrophysics Virtual Institute (Germany), Helmholtz Association, Ministerio de Economía y Competitividad (España), Research Council of Norway, Laboratori Nazionali di Legnaro, Helmholtz Centre for Heavy Ion Research, University of Warsaw, Hadynska-Klek, K., Rodríguez, T. R., Gadea, Andrés, Jungclaus, Andrea, and Quintana, B.
Abstract: Shape parameters of a weakly deformed ground-state band and highly deformed slightly triaxial sideband in Ca42 were determined from E2 matrix elements measured in the first low-energy Coulomb excitation experiment performed with AGATA. The picture of two coexisting structures is well reproduced by new state-of-the-art large-scale shell model and beyond-mean-field calculations. Experimental evidence for superdeformation of the band built on 02+ has been obtained and the role of triaxiality in the A∼40 mass region is discussed. Furthermore, the potential of Coulomb excitation as a tool to study superdeformation has been demonstrated for the first time. © 2016 American Physical Society
Published: 2016

38. Measurement of the single top quark production cross section and |Vtb | in 1.96 TeV pp ¯ collisions with missing transverse energy and jets and final CDF combination

Author: Ministry of Education, Culture, Sports, Science and Technology (Japan), Swiss National Science Foundation, Australian Research Council, European Commission, Academy of Finland, Natural Sciences and Engineering Research Council of Canada, Alfred P. Sloan Foundation, Federal Ministry of Education and Research (Germany), National Research Foundation of Korea, Science and Technology Facilities Council (UK), Russian Foundation for Basic Research, Istituto Nazionale di Fisica Nucleare, National Science Foundation (US), Department of Energy (US), Ministerio de Ciencia e Innovación (España), Slovak Research and Development Agency, Aaltonen, T., Casal, Bruno, Cuevas, Javier, Gómez, Gervasio, Palencia, Enrique, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vilar Cortabitarte, R., Vizán, J., CDF Collaboration, Ministry of Education, Culture, Sports, Science and Technology (Japan), Swiss National Science Foundation, Australian Research Council, European Commission, Academy of Finland, Natural Sciences and Engineering Research Council of Canada, Alfred P. Sloan Foundation, Federal Ministry of Education and Research (Germany), National Research Foundation of Korea, Science and Technology Facilities Council (UK), Russian Foundation for Basic Research, Istituto Nazionale di Fisica Nucleare, National Science Foundation (US), Department of Energy (US), Ministerio de Ciencia e Innovación (España), Slovak Research and Development Agency, Aaltonen, T., Casal, Bruno, Cuevas, Javier, Gómez, Gervasio, Palencia, Enrique, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vilar Cortabitarte, R., Vizán, J., and CDF Collaboration
Abstract: An updated measurement of the single top quark production cross section is presented using the full data set collected by the Collider Detector at Fermilab (CDF), corresponding to 9.5 fb-1 of integrated luminosity from proton-antiproton collisions at 1.96 TeV center-of-mass energy. The events selected contain an imbalance in the total transverse momentum, jets identified as containing b quarks, and no identified leptons. The sum of the s- and t-channel single top quark cross sections is measured to be 3.53-1.16+1.25 pb and a lower limit on the magnitude of the top-to-bottom quark coupling, |Vtb| of 0.63, is obtained at the 95% credibility level. These measurements are combined with previously reported CDF results obtained from events with an imbalance in total transverse momentum, jets identified as originating from b quarks, and one identified lepton. The combined cross section is measured to be 3.02-0.48+0.49 pb and a lower limit on |Vtb| of 0.84 is obtained at the 95% credibility level.
Published: 2016

39. Measurement of the forward-backward asymmetry in low-mass bottom-quark pairs produced in proton-antiproton collisions

Author: Slovak Research and Development Agency, Ministerio de Ciencia e Innovación (España), Department of Energy (US), National Science Foundation (US), Istituto Nazionale di Fisica Nucleare, Ministry of Education, Culture, Sports, Science and Technology (Japan), Natural Sciences and Engineering Research Council of Canada, Alfred P. Sloan Foundation, Federal Ministry of Education and Research (Germany), National Research Foundation of Korea, Science and Technology Facilities Council (UK), Russian Foundation for Basic Research, Academy of Finland, European Commission, Australian Research Council, Swiss National Science Foundation, Aaltonen, T., Casal, Bruno, Cuevas, Javier, Gómez, Gervasio, Palencia, Enrique, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vilar Cortabitarte, R., Vizán, J., CDF Collaboration, Slovak Research and Development Agency, Ministerio de Ciencia e Innovación (España), Department of Energy (US), National Science Foundation (US), Istituto Nazionale di Fisica Nucleare, Ministry of Education, Culture, Sports, Science and Technology (Japan), Natural Sciences and Engineering Research Council of Canada, Alfred P. Sloan Foundation, Federal Ministry of Education and Research (Germany), National Research Foundation of Korea, Science and Technology Facilities Council (UK), Russian Foundation for Basic Research, Academy of Finland, European Commission, Australian Research Council, Swiss National Science Foundation, Aaltonen, T., Casal, Bruno, Cuevas, Javier, Gómez, Gervasio, Palencia, Enrique, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vilar Cortabitarte, R., Vizán, J., and CDF Collaboration
Abstract: We report a measurement of the forward-backward asymmetry, AFB, in bb¯ pairs produced in proton-antiproton collisions and identified by muons from semileptonic b-hadron decays. The event sample is collected at a center-of-mass energy of √s=1.96 TeV with the CDF II detector and corresponds to 6.9 fb−1 of integrated luminosity. We obtain an integrated asymmetry of AFB(bb¯)=(1.2±0.7)% at the particle level for b-quark pairs with invariant mass, mbb¯, down to 40 GeV/c2 and measure the dependence of AFB(bb¯) on mbb¯. The results are compatible with expectations from the standard model.
Published: 2016

40. Measurement of the production and differential cross sections of W+W− bosons in association with jets in pp¯ collisions at √s=1.96 TeV

Author: Ministerio de Ciencia e Innovación (España), Slovak Research and Development Agency, Science and Technology Facilities Council (UK), National Research Foundation of Korea, Federal Ministry of Education and Research (Germany), Alfred P. Sloan Foundation, Natural Sciences and Engineering Research Council of Canada, Academy of Finland, Ministry of Education, Culture, Sports, Science and Technology (Japan), Australian Research Council, Istituto Nazionale di Fisica Nucleare, National Science Foundation (US), Department of Energy (US), European Commission, Russian Foundation for Basic Research, Ministerio de Ciencia e Innovación (España), Slovak Research and Development Agency, Science and Technology Facilities Council (UK), National Research Foundation of Korea, Federal Ministry of Education and Research (Germany), Alfred P. Sloan Foundation, Natural Sciences and Engineering Research Council of Canada, Academy of Finland, Ministry of Education, Culture, Sports, Science and Technology (Japan), Australian Research Council, Istituto Nazionale di Fisica Nucleare, National Science Foundation (US), Department of Energy (US), European Commission, and Russian Foundation for Basic Research
Abstract: We present a measurement of the W-boson-pair production cross section in pp¯ collisions at 1.96 TeV center-of-mass energy and the first measurement of the differential cross section as a function of jet multiplicity and leading-jet energy. The W+W− cross section is measured in the final state comprising two charged leptons and neutrinos, where either charged lepton can be an electron or a muon. Using data collected by the CDF experiment corresponding to 9.7 fb−1 of integrated luminosity, a total of 3027 collision events consistent with W+W− production are observed with an estimated background contribution of 1790±190 events. The measured total cross section is σ(pp¯→W+W−)=14.0±0.6(stat)+1.2−1.0(syst)±0.8(lumi) pb, consistent with the standard model prediction.
Published: 2015

41. Population of the 2(ms)(+) mixed-symmetry state of Ba-140 with the alpha-transfer reaction

Author: Federal Ministry of Education and Research (Germany), Generalitat Valenciana, European Commission, Laboratori Nazionali di Legnaro, Helmholtz International Center for FAIR, Ministerio de Economía y Competitividad (España), Stahl, C., Leske, J., Bauer, C., Gadea, Andrés, Jungclaus, Andrea, Theisen, Ch., Ur, C. A., Valiente-Dobón, J. J., Federal Ministry of Education and Research (Germany), Generalitat Valenciana, European Commission, Laboratori Nazionali di Legnaro, Helmholtz International Center for FAIR, Ministerio de Economía y Competitividad (España), Stahl, C., Leske, J., Bauer, C., Gadea, Andrés, Jungclaus, Andrea, Theisen, Ch., Ur, C. A., and Valiente-Dobón, J. J.
Abstract: Background: Identification of proton-neutron mixed-symmetric one-quadrupole phonon excitations (the 2(ms)(+) states) of atomic nuclei provides information on the isovector part of the residual nucleon-nucleon interaction. It was predicted that the 2(ms)(+) state of particular nuclei close to the U(5) limit of the interacting boson model, in particular Ba-140, should be considerably populated by alpha-transfer reactions [C. E. Alonso et al., Phys. Rev. C 78, 017301 (2008)]. Purpose: We aim at the identification of the 2(ms)(+) mixed-symmetry state (MSS) of radioactive Ba-140 and investigate its population by the alpha-transfer reaction as a suitable tool to selectively populate MSSs and as a potential new signature for its mixed-symmetric character. Method: A gamma-ray spectroscopy experiment was performed in inverse kinematics in order to populate the 2(ms)(+) state of Ba-140 by alpha-transfer from a C-nat target on Xe-136 beam ions. The population of the candidate for the 2(ms)(+) state of Ba-140 was measured relative to the population of the 2(1)(+) state. Results: The candidate for the 2(ms)(+) state of Ba-140 was populated by a transfer three times weaker than predicted. Another 2(+) state that can be ruled out as the MSS was in turn as strongly populated by the a transfer as predicted for the MSS. Conclusions: The relative population of 2(+) states by alpha-transfer cannot serve as a new signature for MSSs, since other 2(+) states are also strongly populated. Nevertheless, the substantial population of the MSS candidate of Ba-140 by alpha transfer qualifies this type of reaction as suitable tool to excite MSSs and study their electromagnetic decay properties. ©2015 American Physical Society
Published: 2015

42. Spectroscopy of the neutron-rich actinide nucleus U-240 following multinucleon-transfer reactions

Author: Generalitat Valenciana, Ministerio de Economía y Competitividad (España), Bonn-Cologne Graduate School of Physics and Astronomy, European Commission, Federal Ministry of Education and Research (Germany), Ministerio de Ciencia e Innovación (España), Birkenbach, B., Vogt, A., Geibel, K., Recchia, F., Gadea, Andrés, Gengelbach, A., Jungclaus, Andrea, Korten, W., Theisen, Ch., Ur, C. A., Vandone, V., Wiens, A., Generalitat Valenciana, Ministerio de Economía y Competitividad (España), Bonn-Cologne Graduate School of Physics and Astronomy, European Commission, Federal Ministry of Education and Research (Germany), Ministerio de Ciencia e Innovación (España), Birkenbach, B., Vogt, A., Geibel, K., Recchia, F., Gadea, Andrés, Gengelbach, A., Jungclaus, Andrea, Korten, W., Theisen, Ch., Ur, C. A., Vandone, V., and Wiens, A.
Abstract: Background: Nuclear structure information for the neutron-rich actinide nuclei is important since it is the benchmark for theoretical models that provide predictions for the heaviest nuclei. Purpose: gamma-ray spectroscopy of neutron-rich heavy nuclei in the actinide region. Method: Multinucleon-transfer reactions in Zn-70 + U-238 and Xe-136 + U-238 have been measured in two experiments performed at the INFN Legnaro, Italy. In the Zn-70 experiment the high-resolution HPGe Clover Array (CLARA) coupled to the magnetic spectrometer PRISMA was employed. In the Xe-136 experiment the high-resolution Advanced Gamma Tracking Array (AGATA) was used in combination with PRISMA and the Detector Array for Multinucleon Transfer Ejectiles (DANTE). Results: The ground-state band (g.s. band) of U-240 was measured up to the 20(+) level and a tentative assignment was made up to the (24(+)) level. Results from gamma gamma coincidence and from particle coincidence analyses are shown. Moments of inertia (MoI) show a clear upbend. Evidence for an extended first negative-parity band of U-240 is found. Conclusions: A detailed comparison with latest calculations shows best agreement with cranked relativistic Hartree-Bogoliubov (CRHB) calculations for the g.s. band properties. The negative-parity band shows the characteristics of a K-pi = 0 band based on an octupole vibration. ©2015 American Physical Society
Published: 2015

43. Search for resonances decaying to top and bottom quarks with the CDF experiment

Author: European Commission, Australian Research Council, Academy of Finland, Slovak Research and Development Agency, Ministerio de Ciencia e Innovación (España), Department of Energy (US), National Science Foundation (US), Istituto Nazionale di Fisica Nucleare, Ministry of Education, Culture, Sports, Science and Technology (Japan), Natural Sciences and Engineering Research Council of Canada, National Natural Science Foundation of China, Swiss National Science Foundation, Alfred P. Sloan Foundation, National Research Foundation of Korea, Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), Aaltonen, T., Casal, Bruno, Cuevas, Javier, Gómez, Gervasio, Palencia, Enrique, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vilar Cortabitarte, R., Vizán, J., CDF Collaboration, European Commission, Australian Research Council, Academy of Finland, Slovak Research and Development Agency, Ministerio de Ciencia e Innovación (España), Department of Energy (US), National Science Foundation (US), Istituto Nazionale di Fisica Nucleare, Ministry of Education, Culture, Sports, Science and Technology (Japan), Natural Sciences and Engineering Research Council of Canada, National Natural Science Foundation of China, Swiss National Science Foundation, Alfred P. Sloan Foundation, National Research Foundation of Korea, Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), Aaltonen, T., Casal, Bruno, Cuevas, Javier, Gómez, Gervasio, Palencia, Enrique, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vilar Cortabitarte, R., Vizán, J., and CDF Collaboration
Abstract: We report on a search for charged massive resonances decaying to top (t) and bottom (b) quarks in the full data set of proton-antiproton collisions at a center-of-mass energy of √s=1.96 TeV collected by the CDF II detector at the Tevatron, corresponding to an integrated luminosity of 9.5 fb−1. No significant excess above the standard model background prediction is observed. We set 95% Bayesian credibility mass-dependent upper limits on the heavy charged-particle production cross section times branching ratio to tb. Using a standard model extension with a W′→tb and left-right-symmetric couplings as a benchmark model, we constrain the W′ mass and couplings in the 300–900 GeV/c2 range. The limits presented here are the most stringent for a charged resonance with mass in the range 300–600 GeV/c2 decaying to top and bottom quarks.
Published: 2015

44. Studies of high-transverse momentum jet substructure and top quarks produced in 1.96 TeV proton-antiproton collisions

Author: European Commission, Istituto Nazionale di Fisica Nucleare, Ministry of Education, Culture, Sports, Science and Technology (Japan), Natural Sciences and Engineering Research Council of Canada, National Natural Science Foundation of China, Swiss National Science Foundation, Alfred P. Sloan Foundation, Federal Ministry of Education and Research (Germany), National Research Foundation of Korea, Science and Technology Facilities Council (UK), Russian Foundation for Basic Research, Ministerio de Ciencia e Innovación (España), Slovak Research and Development Agency, Academy of Finland, Australian Research Council, Weizmann Institute of Science, Israel Science Foundation, Department of Energy (US), National Science Foundation (US), Aaltonen, T., Casal, Bruno, Cuevas, Javier, Gómez, Gervasio, Palencia, Enrique, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vilar Cortabitarte, R., Vizán, J., CDF Collaboration, European Commission, Istituto Nazionale di Fisica Nucleare, Ministry of Education, Culture, Sports, Science and Technology (Japan), Natural Sciences and Engineering Research Council of Canada, National Natural Science Foundation of China, Swiss National Science Foundation, Alfred P. Sloan Foundation, Federal Ministry of Education and Research (Germany), National Research Foundation of Korea, Science and Technology Facilities Council (UK), Russian Foundation for Basic Research, Ministerio de Ciencia e Innovación (España), Slovak Research and Development Agency, Academy of Finland, Australian Research Council, Weizmann Institute of Science, Israel Science Foundation, Department of Energy (US), National Science Foundation (US), Aaltonen, T., Casal, Bruno, Cuevas, Javier, Gómez, Gervasio, Palencia, Enrique, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vilar Cortabitarte, R., Vizán, J., and CDF Collaboration
Abstract: Results of a study of the substructure of the highest transverse momentum (pT) jets observed by the CDF Collaboration are presented. Events containing at least one jet with pT>400 GeV/c in a sample corresponding to an integrated luminosity of 5.95 fb−1, collected in 1.96 TeV proton-antiproton collisions at the Fermilab Tevatron collider, are selected. A study of the jet mass, angularity, and planar-flow distributions is presented, and the measurements are compared with predictions of perturbative quantum chromodynamics. A search for boosted top-quark production is also described, leading to a 95% confidence level upper limit of 38 fb on the production cross section of top quarks with pT>400 GeV/c.
Published: 2015

45. Measurement of the top-quark mass in the tt¯ dilepton channel using the full CDF Run II data set

Author: Ministry of Education, Culture, Sports, Science and Technology (Japan), Australian Research Council, Istituto Nazionale di Fisica Nucleare, National Science Foundation (US), Department of Energy (US), European Commission, Russian Foundation for Basic Research, Academy of Finland, Alfred P. Sloan Foundation, Federal Ministry of Education and Research (Germany), National Research Foundation of Korea, Science and Technology Facilities Council (UK), Slovak Research and Development Agency, Ministerio de Ciencia e Innovación (España), Natural Sciences and Engineering Research Council of Canada, Aaltonen, T., Casal, Bruno, Cuevas, Javier, Gómez, Gervasio, Palencia, Enrique, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vilar Cortabitarte, R., Vizán, J., CDF Collaboration, Ministry of Education, Culture, Sports, Science and Technology (Japan), Australian Research Council, Istituto Nazionale di Fisica Nucleare, National Science Foundation (US), Department of Energy (US), European Commission, Russian Foundation for Basic Research, Academy of Finland, Alfred P. Sloan Foundation, Federal Ministry of Education and Research (Germany), National Research Foundation of Korea, Science and Technology Facilities Council (UK), Slovak Research and Development Agency, Ministerio de Ciencia e Innovación (España), Natural Sciences and Engineering Research Council of Canada, Aaltonen, T., Casal, Bruno, Cuevas, Javier, Gómez, Gervasio, Palencia, Enrique, Ruiz Jimeno, Alberto, Scodellaro, Luca, Vilar Cortabitarte, R., Vizán, J., and CDF Collaboration
Abstract: We present a measurement of the top-quark mass in events containing two leptons (electrons or muons) with a large transverse momentum, two or more energetic jets, and a transverse-momentum imbalance. We use the full proton-antiproton collision data set collected by the CDF experiment during the Fermilab Tevatron Run II at center-of-mass energy √s=1.96 TeV, corresponding to an integrated luminosity of 9.1 fb−1. A special observable is exploited for an optimal reduction of the dominant systematic uncertainty, associated with the knowledge of the absolute energy of the hadronic jets. The distribution of this observable in the selected events is compared to simulated distributions of tt¯ dilepton signal and background. We measure a value for the top-quark mass of 171.5±1.9 (stat)±2.5 (syst) GeV/c2.
Published: 2015

46. Analytical model for polarization-dependent light propagation in waveguide arrays and applications

Author: Fondo Nacional de Desarrollo Científico y Tecnológico (Chile), Comisión Nacional de Investigación Científica y Tecnológica (Chile), Federal Ministry of Education and Research (Germany), Thuringian Ministry of Education, Science and Culture, National Research Foundation Singapore, German-Israeli Foundation for Scientific Research and Development, Ministry of Education (Singapore), Rojas-Rojas, Santiago, Naether, Uta, Fondo Nacional de Desarrollo Científico y Tecnológico (Chile), Comisión Nacional de Investigación Científica y Tecnológica (Chile), Federal Ministry of Education and Research (Germany), Thuringian Ministry of Education, Science and Culture, National Research Foundation Singapore, German-Israeli Foundation for Scientific Research and Development, Ministry of Education (Singapore), Rojas-Rojas, Santiago, and Naether, Uta
Abstract: We study the polarization properties of elliptical femtosecond-laser-written waveguide arrays. An analytical model is presented to explain the asymmetry of the spatial transverse profiles of linearly polarized modes in these waveguides. This asymmetry produces a polarization-dependent coupling coefficient, between adjacent waveguides, which strongly affects the propagation of light in a lattice. Our analysis explains how this effect can be exploited to tune the final intensity distribution of light propagated through the array and links the properties of a polarizing beam splitter in integrated optical circuits to the geometry of the waveguides.
Published: 2014

47. Measurement of the D(2010)(+) Meson Width and the D(2010)(+) - D-0 Mass Difference

Author: Natural Sciences and Engineering Research Council of Canada, Centre National de la Recherche Scientifique (France), Federal Ministry of Education and Research (Germany), German Research Foundation, Istituto Nazionale di Fisica Nucleare, Ministerio de Economía y Competitividad (España), European Commission, Babar Collaboration, Lees, J. P., Martínez-Vidal, Fernando, Oyanguren, Arantza, Villanueva-Pérez, P., Natural Sciences and Engineering Research Council of Canada, Centre National de la Recherche Scientifique (France), Federal Ministry of Education and Research (Germany), German Research Foundation, Istituto Nazionale di Fisica Nucleare, Ministerio de Economía y Competitividad (España), European Commission, Babar Collaboration, Lees, J. P., Martínez-Vidal, Fernando, Oyanguren, Arantza, and Villanueva-Pérez, P.
Abstract: We measure the mass difference Delta m(0) between the D*(2010)(+) and the D-0 and the natural linewidth Gamma of the transition D*(2010)(+) -> D-0 pi(+). The data were recorded with the BABAR detector at center-of-mass energies at and near the gamma(4S) resonance, and correspond to an integrated luminosity of approximately 477 fb(-1). The D-0 is reconstructed in the decay modes D-0 -> K-pi(+) and D-0 -> K-pi(+) and D-0 -> K-pi(+)pi(-)pi(+). For the decay mode D-0 -> K-pi(+) we obtain Gamma = (83.4 +/- 1.7 +/- 1.5) keV and Delta m(0) = (145425.6 +/- 0.6 +/- 18) keV, where the quoted errors are statistical and systematic, respectively. For the D-0 -> K-pi(+)pi(-)pi(+) mode we obtain Gamma = (83.2 +/- 1.5 +/- 2.6) keV and Delta m(0) = (145426.6 +/- 0.5 +/- 2.0) keV. The combined measurements yield Gamma = (83.3 +/- 1.2 +/- 1.4) keV and Delta m(0) (145425.9 +/- 0.4 +/- 1.7) keV; the width is a factor of approximately 12 times more precise than the previous value, while the mass difference is a factor of approximately 6 times more precise.
Published: 2013

48. Measurement of the e(+)e(-) -> p(p)over-bar cross section in the energy range from 3.0 to 6.5 GeV

Author: National Science Foundation (US), Natural Sciences and Engineering Research Council of Canada, Institut National de Physique Nucléaire et de Physique des Particules (France), German Research Foundation, Istituto Nazionale di Fisica Nucleare, Foundation for Fundamental Research on Matter, Federal Ministry of Education and Research (Germany), Commissariat à l'Ènergie Atomique et aux Ènergies Alternatives (France), Department of Energy (US), Babar Collaboration, Lees, J. P., Martínez-Vidal, Fernando, Oyanguren, Arantza, Villanueva-Pérez, P., National Science Foundation (US), Natural Sciences and Engineering Research Council of Canada, Institut National de Physique Nucléaire et de Physique des Particules (France), German Research Foundation, Istituto Nazionale di Fisica Nucleare, Foundation for Fundamental Research on Matter, Federal Ministry of Education and Research (Germany), Commissariat à l'Ènergie Atomique et aux Ènergies Alternatives (France), Department of Energy (US), Babar Collaboration, Lees, J. P., Martínez-Vidal, Fernando, Oyanguren, Arantza, and Villanueva-Pérez, P.
Abstract: The e(+)e(-) -> p (p) over bar cross section and the proton magnetic form factor have been measured in the center-of-mass energy range from 3.0 to 6.5 GeV using the initial-state radiation technique with an undetected photon. This is the first measurement of the form factor at energies higher than 4.5 GeV. The analysis is based on 469 fb-1 of integrated luminosity collected with the BABAR detector at the PEP-II collider at e(+)e(-) center-of-mass energies near 10.6 GeV. The branching fractions for the decays J/psi -> p (p) over bar and psi(2S) -> p (p) over bar have also been measured.
Published: 2013

49. First Measurement of the CP-Violating Phase in B-s(0) -> phi phi Decays

Author: Ministerio de Economía y Competitividad (España), Xunta de Galicia, Generalitat de Catalunya, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil), Federal Ministry of Education and Research (Germany), Istituto Nazionale di Fisica Nucleare, Netherlands Organization for Scientific Research, Rosatom State Atomic Energy Corporation (Russia), Swiss National Science Foundation, LHCb Collaboration, Aaij, R., Oyanguren, Arantza, Ruiz Valls, Pablo, Ministerio de Economía y Competitividad (España), Xunta de Galicia, Generalitat de Catalunya, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil), Federal Ministry of Education and Research (Germany), Istituto Nazionale di Fisica Nucleare, Netherlands Organization for Scientific Research, Rosatom State Atomic Energy Corporation (Russia), Swiss National Science Foundation, LHCb Collaboration, Aaij, R., Oyanguren, Arantza, and Ruiz Valls, Pablo
Abstract: A first flavor-tagged measurement of the time-dependent CP-violating asymmetry in B-s(0) -> phi phi decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the interference between B-s(0)-(B) over bar (0)(s) mixing and the b -> s (s) over bars gluonic penguin decay amplitude. Using a sample of pp collision data corresponding to an integrated luminosity of 1.0 fb(-1) and collected at a center-of-mass energy of 7 TeV with the LHCb detector, 880 B-s(0) -> phi phi signal decays are obtained. The CP-violating phase is measured to be in the interval [-2.46, -0.76] rad at a 68% confidence level. The p value of the standard model prediction is 16%.
Published: 2013

50. Determination of the X(3872) meson quantum numbers.

Author: Ministerio de Economía y Competitividad (España), Generalitat de Catalunya, Xunta de Galicia, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil), Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil), Federal Ministry of Education and Research (Germany), German Research Foundation, Helmholtz Association, Istituto Nazionale di Fisica Nucleare, Netherlands Organization for Scientific Research, Rosatom State Atomic Energy Corporation (Russia), Russian Foundation for Basic Research, Swiss National Science Foundation, National Science Foundation (US), Karlsruhe Institute of Technology, LHCb Collaboration, Aaij, R., Oyanguren, Arantza, Ruiz Valls, Pablo, Ministerio de Economía y Competitividad (España), Generalitat de Catalunya, Xunta de Galicia, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil), Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil), Federal Ministry of Education and Research (Germany), German Research Foundation, Helmholtz Association, Istituto Nazionale di Fisica Nucleare, Netherlands Organization for Scientific Research, Rosatom State Atomic Energy Corporation (Russia), Russian Foundation for Basic Research, Swiss National Science Foundation, National Science Foundation (US), Karlsruhe Institute of Technology, LHCb Collaboration, Aaij, R., Oyanguren, Arantza, and Ruiz Valls, Pablo
Abstract: The quantum numbers of the X(3872) meson are determined to be J(PC) = 1(++) based on angular correlations in B+ -> X(3872)K+ decays, where X(3872) -> pi(+) pi(-) j/psi and J/psi -> pi(+) mu(-). The data correspond to 1.0 fb(-1) of pp collisions collected by the LHCb detector. The only alternative assignment allowed by previous measurements J(PC) = 2(-+) is rejected with a confidence level equivalent to more than 8 Gaussian standard deviations using a likelihood-ratio test in the full angular phase space. This result favors exotic explanations of the X(3872) state.
Published: 2013

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