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49 results on '"Alcorta, Martín"'

1. Hints of quasi-molecular states in 13B via the study of 9Li-4He elastic scattering

Author

Istituto Nazionale di Fisica Nucleare, Ministerio de Ciencia, Innovación y Universidades (España), Junta de Andalucía, Pietro, A. di, Shotter, A.C., Fernández-García, J. P., Figuera, P., Fisichella, M., Moro, A.M., Alcorta, Martín, García Borge, María José, Davinson, Thomas, Ferrera, F., Laird, A.M., Lattuada, M., Soic, Neven, Tengblad, Olof, Torresi, D., Zadro, M., Istituto Nazionale di Fisica Nucleare, Ministerio de Ciencia, Innovación y Universidades (España), Junta de Andalucía, Pietro, A. di, Shotter, A.C., Fernández-García, J. P., Figuera, P., Fisichella, M., Moro, A.M., Alcorta, Martín, García Borge, María José, Davinson, Thomas, Ferrera, F., Laird, A.M., Lattuada, M., Soic, Neven, Tengblad, Olof, Torresi, D., and Zadro, M.

Abstract

This paper reports on elastic scattering excitation functions for the reaction Li+He measured at backward angles in the centre of mass energy range 5 MeV ≤ E≤c.m.9.5 MeV, with the aim of investigating the possible existence of molecular resonances which have been predicted to exist in the case of neutron-rich B-isotopes. Due to the short lifetime of Li, the experiment necessitated the use of inverse kinematics on a gaseous He target. The Thick Target Inverse Kinematics technique was used which allowed for the measurement of the full excitation function in a single Li run. Broad resonances were observed in the excitation region for B 15 MeV ≤ E≤20 MeV. To understand the nature of such broad structures, various theoretical attempts are reported concerning possible reaction mechanisms for this neutron rich reaction. The most promising approach to interpret the data is within the orbiting reaction scenario.

Published
2022

2. Exotic clustering investigation in 13 B and 14 C using RIBs

Author

Di Pietro, A., Fernández-García, J.P., Figuera, P., Fisichella, M., Heinitz, S., Lattuada, M., Torresi, D., Alcorta, Martín, García Borge, María José, Davinson, T., Laird, A.M., Shotter, A.C., Shumann, D., Soic, N., Tengblad, Olof, Zadro, M., and SCOAP

Abstract

6 pags., 4 figs. -- Open Access funded by Creative Commons Atribution Licence 4.0, This contribution reports on the investigation about the existence of molecular and/or exotic cluster configurations in boron and carbon n-rich isotopes. To this aim two experiments were performed: the first experimental study of exotic 9Li + 4He cluster states in 13B using the resonance scattering method at TRIUMF, and, with the same technique, the measurement of 10Be + 4He scattering at LNS in Catania, where a 10Be radioactive beam was produced for the first time. In the case of 13B, the elastic excitation function shows the presence of various peaks in an excitation energy region never explored before. In the case of 14C, our exclusive measurement of elastic scattering data with a high intensity beam, sheds some light on previously published results which seemed to be in contradiction.

Published
2019

3. Exotic clustering investigation in 13 B and 14 C using RIBs

Author

SCOAP, Di Pietro, A., Fernández-García, J.P., Figuera, P., Fisichella, M., Heinitz, S., Lattuada, M., Torresi, D., Alcorta, Martín, García Borge, María José, Davinson, T., Laird, A.M., Shotter, A.C., Shumann, D., Soic, N., Tengblad, Olof, Zadro, M., SCOAP, Di Pietro, A., Fernández-García, J.P., Figuera, P., Fisichella, M., Heinitz, S., Lattuada, M., Torresi, D., Alcorta, Martín, García Borge, María José, Davinson, T., Laird, A.M., Shotter, A.C., Shumann, D., Soic, N., Tengblad, Olof, and Zadro, M.

Abstract

This contribution reports on the investigation about the existence of molecular and/or exotic cluster configurations in boron and carbon n-rich isotopes. To this aim two experiments were performed: the first experimental study of exotic 9Li + 4He cluster states in 13B using the resonance scattering method at TRIUMF, and, with the same technique, the measurement of 10Be + 4He scattering at LNS in Catania, where a 10Be radioactive beam was produced for the first time. In the case of 13B, the elastic excitation function shows the presence of various peaks in an excitation energy region never explored before. In the case of 14C, our exclusive measurement of elastic scattering data with a high intensity beam, sheds some light on previously published results which seemed to be in contradiction.

Published
2019

4. Experimental investigation of exotic clustering in 13B and 14C using the resonance scattering method.

Author

SCOAP, Pietro, A. di, Fernández-García, J. P., Ferrera, F., Figuera, P., Fisichella, M., Lattuada, M., Marletta, S., Marchetta, C., Torresi, D., Alcorta, Martín, García Borge, María José, Davinson, T., Heinitz, S., Laird, A.M., Shotter, A. C., Schumann, D., Soic, N., Tengblad, Olof, Zadro, M., SCOAP, Pietro, A. di, Fernández-García, J. P., Ferrera, F., Figuera, P., Fisichella, M., Lattuada, M., Marletta, S., Marchetta, C., Torresi, D., Alcorta, Martín, García Borge, María José, Davinson, T., Heinitz, S., Laird, A.M., Shotter, A. C., Schumann, D., Soic, N., Tengblad, Olof, and Zadro, M.

Abstract

In order to investigate the existence of molecular and/or exotic cluster configurations in Boron and Carbon n-rich isotopes we undertook two experiments: the first experimental study of exotic 9Li+¿ cluster states in 13B using the resonance scattering method at TRIUMF (Canada), and, with the same technique, the measurement of 10Be+¿ scattering at LNS in Catania, where a 10Be radioactive beam was produced for the first time. In order to measure the excitation function in a wide energy range, the beams were stopped in a Helium-flooded chamber. In the case of 13B, the elastic excitation function shows the presence of various peaks in an excitation energy region never explored before. In the case of 14C, our exclusive measurement of elastic scattering data with a high intensity beam, sheds some light on the contradictory previously published results [1, 2].

Published
2018

5. Simultaneous analysis of the elastic scattering and breakup channel for the reaction Li 11 + Pb 208 at energies near the Coulomb barrier

Author

Fernández García, J. P., Cubero, M., Acosta, Luis, Alcorta, Martín, Álvarez, M. A. G., García Borge, María José, Galaviz, D., Gómez-Camacho, Joaquín, Lay, J. A., Madurga, Miguel, Martel, Ismael, Moro, A. M., Mukha, I., Rodríguez-Gallardo, M., Sánchez-Benítez, A. M., Tengblad, Olof, Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), Università degli Studi di Padova, Ministerio de Ciencia e Innovación (España), and European Commission

Abstract

et al., We present a detailed analysis of the elastic scattering and breakup channel for the reaction of Li11 on Pb208 at incident laboratory energies of 24.3 and 29.8 MeV, measured at the radioactive ion beam facility of TRIUMF, in Vancouver, Canada. A large yield of Li9 fragments was detected by four charged particle telescopes in a wide angular range. The experimental angular and energy distributions of these Li9 fragments have been compared to coupled-reaction-channel and continuum-discretized coupled-channel calculations. The large production of Li9 fragments at small angles can be explained by considering a direct breakup mechanism, while at medium-large angles a competition between direct breakup and neutron transfer to the continuum of the Pb208 target was observed., This work has been partially supported by Spanish National Projects No. FPA2009-08848, No. FPA2009-07387, No. FPA2010-22131-C02-01, No. FPA2009-07653, No. FPA2012-32443 and by the Consolider-Ingenio 2010 Program CPAN (CSD2007-00042). M.R.G. acknowledges the financial support from the program VPPI-US. C.A.D acknowledges the financial support from the U.K. Science and Technology Facilities Council through Grant No. EP/D060575/1. J.A.L. acknowledges a Marie Curie Piscopia fellow at the University of Padova.

Published
2015

6. Investigation of cluster states in B-13 using the 9Li-alpha resonant elastic scattering

Author

SCOAP, Pietro, Antonio D., Fernández-García, J. D, Fisichella, M., Alcorta, Martín, García Borge, María José, Davinson, T., Ferrera, F., Figuera, P., Laird, A.M., Lattuada, M., Shotter, A. C., Soic, N., Torresi, D., Zadro, M., Tengblad, Olof, SCOAP, Pietro, Antonio D., Fernández-García, J. D, Fisichella, M., Alcorta, Martín, García Borge, María José, Davinson, T., Ferrera, F., Figuera, P., Laird, A.M., Lattuada, M., Shotter, A. C., Soic, N., Torresi, D., Zadro, M., and Tengblad, Olof

Abstract

The excitation function of the resonant reaction He-4(Li-9,alpha) was measured with the aim of investigating the compound nucleus B-13. These measurements were performed in inverse kinematics at center-of-mass scattering angles close to 180 degrees by using a thick He-4 gas target and a Li-9 beam. The B-13 excitation energy region explored was 14-20 MeV where Li-9-alpha configurations of B-13 are predicted by Antysimmetrised Molecular Dynamics calculations. The measured excitation function at theta(cm) = 180 degrees shows different clear structures in a B-13 excitation energy region which was experimentally unknown.

Published
2017

7. Nuclear Force Imprints Revealed on the Elastic Scattering of Protons with 10C

Author

Kumar, A., Kanungo, Rituparna, Calci, Angelo, Navrátil, Petr, Sanetullaev, A., Alcorta, Martín, Bildstein, V., Christian, Gary D., Davids, B., Dohet-Eraly, Jérémy, Fallis, J., Gallant, A., Hackman, G., Hadinia, Baharak, Hupin, Guillaume, Ishimoto, S., Krücken, Reiner, Laffoley, A., Lighthall, J., Miller, D., Quaglioni, Sofia, Randhawa, J., Rand, E., Rojas, A., Roth, R., Shotter, A., Tanaka, Junji, Tanihata, Isao, Unsworth, C., Kumar, A., Kanungo, Rituparna, Calci, Angelo, Navrátil, Petr, Sanetullaev, A., Alcorta, Martín, Bildstein, V., Christian, Gary D., Davids, B., Dohet-Eraly, Jérémy, Fallis, J., Gallant, A., Hackman, G., Hadinia, Baharak, Hupin, Guillaume, Ishimoto, S., Krücken, Reiner, Laffoley, A., Lighthall, J., Miller, D., Quaglioni, Sofia, Randhawa, J., Rand, E., Rojas, A., Roth, R., Shotter, A., Tanaka, Junji, Tanihata, Isao, and Unsworth, C.

Abstract

info:eu-repo/semantics/published

Published
2017

8. 11Li structural information from inclusive break-up measurements

Author

Fernández García, Juan Pablo, Cubero, M., Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Borge, María José G., Gómez Camacho, Joaquín José, Lay Valera, José Antonio, Martel Bravo, Ismael, Moro Muñoz, Antonio Matías, Rodríguez Gallardo, Manuela, Sánchez Benítez, A. M., and Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear

Abstract

IWM-EC 2014 – International Workshop on Multi facets of EoS and Clustering Structure information of 11Li halo nucleus has been obtained from the inclusive break-up measurements of the 11Li+208Pb reactions at energies around the Coulomb barrier (Elab = 24.3 and 29.8 MeV). The effective break-up energy and the slope of B(E1) distribution close to the threshold have been extracted from the experimental data

Published
2015

9. Simultaneous analysis of the elastic scattering and breakup channel for the reaction 11 Li + 208 Pb at energies near the Coulomb barrier

Author

Fernández García, Juan Pablo, Cubero, M, Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Borge, María José G, Walden, Patrick L, Gómez Camacho, Joaquín José, Lay Valera, José Antonio, Moro Muñoz, Antonio Matías, Rodríguez Gallardo, Manuela, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, and Ministerio de Educación y Ciencia (MEC). España

Abstract

We present a detailed analysis of the elastic scattering and breakup channel for the reaction of Li11 on Pb208 at incident laboratory energies of 24.3 and 29.8 MeV, measured at the radioactive ion beam facility of TRIUMF, in Vancouver, Canada. A large yield of Li9 fragments was detected by four charged particle telescopes in a wide angular range. The experimental angular and energy distributions of these Li9 fragments have been compared to coupled-reaction-channel and continuum-discretized coupled-channel calculations. The large production of Li9 fragments at small angles can be explained by considering a direct breakup mechanism, while at medium-large angles a competition between direct breakup and neutron transfer to the continuum of the Pb208 target was observed. Proyecto Nacional (España) PA2009-08848 PA2009-07387 PA2010-22131-C02-01 FPA2009-07653 FPA2012-32443 Programa Consolider-Ingenio 2010 (España) CSD2007-00042

Published
2015

10. Precise Determination of the Unperturbed 8B Neutrino Spectrum

Author

Roger, T., Alcorta, Martín, García Borge, María José, Carmona Gallardo, M., Galaviz, D., Perea, Ángel, Tengblad, Olof, and Wilschut, H.W.

Subjects
PACS 6 ≤ A ≤ 19, PACS Solar neutrinos, PACS Weak-interaction and lepton (including neutrino) aspects
Abstract

5 p.: gráf., A measurement of the final state distribution of the 8B decay, obtained by implanting a 8B beam in a double-sided silicon strip detector, is reported here. The present spectrum is consistent with a recent independent precise measurement performed by our collaboration at the IGISOL facility, Jyväskylä[O. S. Kirsebom et al., Phys. Rev. C 83, 065802 (2011)]. It shows discrepancies with previously measured spectra, leading to differences in the derived neutrino spectrum. Thanks to a low detection threshold, the neutrino spectrum is for the first time directly extracted from the measured final state distribution, thus avoiding the uncertainties related to the extrapolation of R-matrix fits. Combined with the IGISOL data, this leads to an improvement of the overall errors and the extension of the neutrino spectrum at high energy. The new unperturbed neutrino spectrum represents a benchmark for future measurements of the solar neutrino flux as a function of energy., Supported by FWO-Vlaanderen(Belgium), the IUAP-Belgian State Belgian Science Policy (BriX network P6/23), the Dutch FOM program 114 (TRI P), the European Union—Research Infrastructure Action under the FP6 ‘‘Structuring theEuropean Research Area’’ Program, and the Spanish projects FPA2009-07387, FPA2010-17142 and CSD2007-00042.

Published
2013

11. Li11 breakup on Pb208 at energies around the coulomb barrier

Author

Fernández García, J. P., Cubero, M., Rodríguez Gallardo, Manuela, Acosta, Luis, Alcorta, Martín, Álvarez, M. A. G., García Borge, María José, Gómez-Camacho, Joaquín, Lay, J. A., Madurga, Miguel, Martel, Ismael, Moro, A. M., Mukha, I., Sánchez-Benítez, A. M., Tengblad, Olof, Centro Nacional de Física de Partículas, Astropartículas y Nuclear (España), and Ministerio de Economía y Competitividad (España)

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

The inclusive breakup for the Li11+Pb208 reaction at energies around the Coulomb barrier has been measured for the first time. A sizable yield of Li9 following the Li11 dissociation has been observed, even at energies well below the Coulomb barrier. Using the first-order semiclassical perturbation theory of Coulomb excitation it is shown that the breakup probability data measured at small angles can be used to extract effective breakup energy as well as the slope of B(E1) distribution close to the threshold. Four-body continuum-discretized coupled-channels calculations, including both nuclear and Coulomb couplings between the target and projectile to all orders, reproduce the measured inclusive breakup cross sections and support the presence of a dipole resonance in the Li11 continuum at low excitation energy. © 2013 American Physical Society., This work has been partially supported by Spanish national projects FPA2009-08848, FPA2009-07387, FPA2010-22131-C02-01, and FPA2009-07653, and by the Consolider Ingenio 2010 Program CPAN (CSD2007- 00042).

Published
2013

12. Astrophysical S factor for the He-4(He-3,gamma)Be-7 reaction at medium energies

Author

Carmona-Gallardo, M., Singh, B.S.N., Tengblad, Olof, Hass, M., Alcorta, Martín, García Borge, María José, Briz, José Antonio, Cruz, C., Cubero, M., Domínguez-Reyes, Ricardo, Fulton, B.R., Fynbo, H.O.U., Gordillo, N., Haquin, G., Nir-El, Y., Kumar, V., Maira-Vidal, A., McGrath, J., Muñoz-Martín, A., Perea, Ángel, and Yungreis, Z.

Abstract

3 pags., 1 tab. -- Nuclear Physics in Astrophysics V 3–8 April 2011, Eilat, Israel, The astrophysical S factor for the He-4(He-3,gamma)Be-7 direct capture reaction plays a major role in the context of solar neutrino flux and primordial Li-7 abundances that demand accurate information on the reaction. We report here our recent cross section measurements using the activation method in the region of E-CM=900-2800 keV, that aim to shed light on the discrepancies in the existing data and lead to a more accurate extrapolation of the S factor.

Published
2012

13. Observation of α decay from a state in 10B at 11.48 MeV

Author

Kirsebom, O.S., Alcorta, Martín, García Borge, María José, Cubero, M., Fynbo, H.O.U., Madurga, Miguel, and Tengblad, Olof

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

We report on the observation of α decay from a state in 10B at 11.48 MeV. The only observed decay branch is to the first T=1 state in 6Li at 3.56 MeV. The apparent absence of an α-decay branch to the (T=0) ground state in 6Li suggests that the 11.48-MeV state should be assigned isospin T=1. The spin and parity of the 11.48-MeV state could not be directly determined from the present study apart from J=0 being ruled out by the observed angular correlation. We conjecture that the 11.48-MeV state is the analog of the 10.15-MeV, (4 +) state in 10Be, constitutes the third member of a rotational band built on the 0 + state at 7.65 MeV, and has pronounced molecular structure. © 2012 American Physical Society., Support of the Spanish CICYT research Grant No. FPA2009-07387 and the MICINN Consolider Project No. CSD 2007-00042 as well as the support of the European Union VI Framework through RII3-EURONS/JRA4-DLEP (Contract No. 506065). OSK acknowledges support from the Villum Kann Rasmussen Foundation.

Published
2012

14. Properties of 12C resonances determined from the 10B(3He, p alpha alpha alpha) and 11B(3He,d alpha alpha alpha) reactions studied in complete kinematics

Author

Alcorta, Martín, García Borge, María José, Cubero, M., Diget, C. Aa., Domínguez-Reyes, Ricardo, Fraile, Luis M., Fulton, B.R., Fynbo, H.O.U., Galaviz, D., Hyldegaard, S., Jeppesen, H., Jonson, Björn, Kirsebom, O.S., Madurga, Miguel, Maira-Vidal, A., Muñoz-Martín, A., Nilsson, Thomas, Nyman, Göran, Obradors, Diego, Perea, Ángel, Riisager, Karsten, Tengblad, Olof, and Turrión, Manuela

Subjects
Nuclear Experiment
Abstract

We have used the 10B(3He,p¿¿¿) reaction at 4.9 MeV and the 11B(3He,d¿¿¿) reaction at 8.5 MeV to determine the energy, width, and decay mechanism of resonances in 12C above the triple-¿ threshold up to 21 MeV in excitation energy. Comparison with various models has allowed us to estimate the degree of clustering of the states studied. © 2012 American Physical Society., Support by the Spanish Research Grant FPA2009-07387 and Consolider Project CSD2007-00042, by the European Union Sixth Framework through RII3- EURONS/ JRA4-DLEP (Contract No. 506065). Support of the CSIC I3P program cofinanced by the European Social Fund, and the support of the US Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357. O.S.K. Support from the Villum Kann Rasmussen Foundation.

Published
2012

15. The 8Li + 2H reaction studied in inverse kinematics at 3.15 MeV/nucleon using the REX-ISOLDE post-accelerator

Author

Tengborn, E., Moro, A. M., Alcorta, Martín, García Borge, María José, Gómez-Camacho, Joaquín, Madurga, Miguel, Tengblad, Olof, and Turrión, Manuela

Abstract

12 páginas, 9 figuras, 3 tablas.-- et al., The reaction 8Li + 2H has been studied in inverse kinematics at the incident energy of 3.15 MeV/nucleon, using the REX-ISOLDE post-accelerator. The reaction channels corresponding to (d,p), (d,d), and (d,t) reactions populating ground states and low-lying excited states in 7 -9Li have been identified and the related angular distributions extracted and compared with coupled-channels, distorted-wave Born approximation (DWBA), and coupled-reaction-channels calculations. For the inelastic and (d,t) channels we find that higher order effects are very important and hence one needs to go beyond the simple DWBA to extract reliable structure information from these processes. © 2011 American Physical Society., The financial support of the Swedish Research Council for this work under Grant No. 2008-4158 is gratefully acknowledged, as well as support by the Lars Hierta Memorial Foundation. T. Nilsson acknowledges support through the Royal Swedish Academy of Sciences Research program by a grant from the Knut and Alice Wallenberg Foundation. This work is partially supported by the Spanish Ministerio de Ciencia e Innovacion under Projects No. FPA2006-13807- ´ C02-01, No. FPA2009-08848, No. FPA2009-07653, No. FPA2009-07387, and No. FPA2010-17142 and by the European Union Sixth Framework through RII3-EURONS (Contract No. 506065).

Published
2011

16. C formation: A classical quest in new Light

Author

Tengblad, Olof, Alcorta, Martín, García Borge, María José, Cubero, M., Madurga, Miguel, Perea, Ángel, Fynbo, H.O.U., Kirsebom, O., Hyldegaard, S., Jonson, B., Nyman, G., Nilsson, T., Diget, D.G., Fulton, B., and Riisager, K.

Abstract

In this work we have studied the break‐up of 12C following the reactions 10B(3He,pααα) and 11B(3He,dααα). The study was performed at the 5 MV tandem in Madrid. The break‐up gives us information on excited states in 12C from the famous Hoyle state up to an energy of almost 18 MeV. Using a highly segmented experimental set‐up the simultaneous detection of the three alpha particles in coincidence with a proton or deuteron respectively made possible a full kinematic reconstruction of the break‐up. On the basis of the energies of the 3 α particles and their angular correlations it has been possible to determine the spin and parity of states for cases in which the assignment has been doubtful. Some of these levels will also de‐excite via electromagnetic emission. The comparison between the energy of proton that populate a state of 12C and the sum of the energies of the 3α emitted from the same state makes possible to determine the presence of electromagnetic disintegration (γ) to lower states within 12C followed by the 3α break‐up. © 2011 American Institute of Physics

Published
2011

17. Precise and accurate determination of the B8 decay spectrum

Author

Kirsebom, O.S., Hyldegaard, S., Alcorta, Martín, García Borge, María José, Madurga, Miguel, Tengblad, Olof, and Azystö, J.

Abstract

Accurate measurements of the B8 neutrino spectrum are important for the interpretation of solar neutrino data. Experimentally, the B8 neutrino spectrum can be obtained from the measurement of the β-delayed α spectrum. We report on an α-α coincidence measurement performed at the IGISOL facility in Jyväskylä, Finland. Our measurement allows extensive cross-checks to be performed and gives a more intense neutrino spectrum at high energies compared to the present standard. The deviation reaches 4% at the end point of the spectrum. Below 11 MeV, the deviation is less than 1%. © 2011 American Physical Society., This work has been supported by the EU 6th Framework Programme “Integrating Infrastructure Initiative— Transnational Access,” Contract No. 506065 (EURONS, JRAs TRAPSPEC and DLEP), by the Academy of Finland under the Finnish Centre of Excellence Programme 2006-2011 (Project No. 213503, Nuclear and Accelerator Based Physics Programme at JYFL), by the Nordic Infrastructure Project (NordForsk Project No. 070315), and by the Spanish Funding Agency MICINN (Contract No. FPA2009-07387).

Published
2011

19. Simultaneous analysis of the elastic scattering and breakup channel for the reaction 11 Li + 208 Pb at energies near the Coulomb barrier

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Educación y Ciencia (MEC). España, Fernández García, Juan Pablo, Cubero, M, Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Borge, María José G, Walden, Patrick L, Gómez Camacho, Joaquín José, Lay Valera, José Antonio, Moro Muñoz, Antonio Matías, Rodríguez Gallardo, Manuela, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Educación y Ciencia (MEC). España, Fernández García, Juan Pablo, Cubero, M, Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Borge, María José G, Walden, Patrick L, Gómez Camacho, Joaquín José, Lay Valera, José Antonio, Moro Muñoz, Antonio Matías, and Rodríguez Gallardo, Manuela

Abstract

We present a detailed analysis of the elastic scattering and breakup channel for the reaction of Li11 on Pb208 at incident laboratory energies of 24.3 and 29.8 MeV, measured at the radioactive ion beam facility of TRIUMF, in Vancouver, Canada. A large yield of Li9 fragments was detected by four charged particle telescopes in a wide angular range. The experimental angular and energy distributions of these Li9 fragments have been compared to coupled-reaction-channel and continuum-discretized coupled-channel calculations. The large production of Li9 fragments at small angles can be explained by considering a direct breakup mechanism, while at medium-large angles a competition between direct breakup and neutron transfer to the continuum of the Pb208 target was observed.

Published
2015

20. 11Li structural information from inclusive break-up measurements

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Fernández García, Juan Pablo, Cubero, M., Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Borge, María José G., Gómez Camacho, Joaquín José, Lay Valera, José Antonio, Martel Bravo, Ismael, Moro Muñoz, Antonio Matías, Rodríguez Gallardo, Manuela, Sánchez Benítez, A. M., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Fernández García, Juan Pablo, Cubero, M., Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Borge, María José G., Gómez Camacho, Joaquín José, Lay Valera, José Antonio, Martel Bravo, Ismael, Moro Muñoz, Antonio Matías, Rodríguez Gallardo, Manuela, and Sánchez Benítez, A. M.

Abstract

Structure information of 11Li halo nucleus has been obtained from the inclusive break-up measurements of the 11Li+208Pb reactions at energies around the Coulomb barrier (Elab = 24.3 and 29.8 MeV). The effective break-up energy and the slope of B(E1) distribution close to the threshold have been extracted from the experimental data

Published
2015

21. Simultaneous analysis of the elastic scattering and breakup channel for the reaction Li 11 + Pb 208 at energies near the Coulomb barrier

Author

Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), Università degli Studi di Padova, Ministerio de Ciencia e Innovación (España), European Commission, Fernández-García, J. P., Cubero, M., Acosta, Luis, Alcorta, Martín, Álvarez, M. A. G., García Borge, María José, Galaviz, D., Gómez-Camacho, Joaquín, Lay, J. A., Madurga, Miguel, Martel, Ismael, Moro, A.M., Mukha, I., Rodríguez Gallardo, Manuela, Sánchez-Benítez, A. M., Tengblad, Olof, Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), Università degli Studi di Padova, Ministerio de Ciencia e Innovación (España), European Commission, Fernández-García, J. P., Cubero, M., Acosta, Luis, Alcorta, Martín, Álvarez, M. A. G., García Borge, María José, Galaviz, D., Gómez-Camacho, Joaquín, Lay, J. A., Madurga, Miguel, Martel, Ismael, Moro, A.M., Mukha, I., Rodríguez Gallardo, Manuela, Sánchez-Benítez, A. M., and Tengblad, Olof

Abstract

We present a detailed analysis of the elastic scattering and breakup channel for the reaction of Li11 on Pb208 at incident laboratory energies of 24.3 and 29.8 MeV, measured at the radioactive ion beam facility of TRIUMF, in Vancouver, Canada. A large yield of Li9 fragments was detected by four charged particle telescopes in a wide angular range. The experimental angular and energy distributions of these Li9 fragments have been compared to coupled-reaction-channel and continuum-discretized coupled-channel calculations. The large production of Li9 fragments at small angles can be explained by considering a direct breakup mechanism, while at medium-large angles a competition between direct breakup and neutron transfer to the continuum of the Pb208 target was observed.

Published
2015

22. Li-11 structural information from inclusive break-up measurements

Author

SCOAP, Fernández-García, J. P., Cubero, M., Acosta, Luis, Alcorta, Martín, Álvarez, M. A. G., García Borge, María José, Galaviz, D., Gómez-Camacho, Joaquín, Lay, J. A., Madurga, Miguel, Martel, Ismael, Moro, A.M., Mukha, I., Rodríguez Gallardo, Manuela, Sánchez-Benítez, A. M., Tengblad, Olof, SCOAP, Fernández-García, J. P., Cubero, M., Acosta, Luis, Alcorta, Martín, Álvarez, M. A. G., García Borge, María José, Galaviz, D., Gómez-Camacho, Joaquín, Lay, J. A., Madurga, Miguel, Martel, Ismael, Moro, A.M., Mukha, I., Rodríguez Gallardo, Manuela, Sánchez-Benítez, A. M., and Tengblad, Olof

Abstract

Structure information of 11Li halo nucleus has been obtained from the inclusive break-up measurements of the 11Li+208Pb reactions at energies around the Coulomb barrier (Elab = 24.3 and 29.8 MeV). The effective break-up energy and the slope of B(E1) distribution close to the threshold have been extracted from the experimental data.

Published
2015

23. Dynamic studies of 11Li and its core 9Li on 208Pb near the Coulomb barrier

Author

Cubero, M., García Borge, María José, Acosta, Luis, Alcorta, Martín, Álvarez, M. A. G., Galaviz, D., Fernández García, J. P., Gómez-Camacho, Joaquín, Lay, J. A., Madurga, Miguel, Martel, Ismael, Moro, A. M., Mukha, I., Sánchez-Benítez, A. M., and Tengblad, Olof

Abstract

Comunicación presentada al "International scientific meeting on nuclear physics: basic concepts in nuclear physics: theory, experiments and applications" celebrado del 4 al 10 de julio del 2009 en La Rábida (España).-- et al., We measured the scattering of the halo nucleus Li-11 and its core Li-9 on the lead target at TRIUMF at energies below and around to the Coulomb barrier. We report here on our preliminary analysis of the inclusive breakup reaction.

Published
2010

24. Detailed β-decay study of Ar33

Author

Adimi, N., Domínguez-Reyes, Ricardo, Alcorta, Martín, García Borge, María José, Santos, F. de Oliveira, Dossat, C., Fynbo, H.O.U., Giovinazzo, J., Knudsen, H.H., Madurga, Miguel, Matea, I., Perea, Ángel, Sümmerer, K., Tengblad, Olof, and Thomas, J.C.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

The proton-rich nucleus Ar33 has been studied by detailed proton and γ-ray spectroscopy at the low-energy facility of SPIRAL at GANIL. Proton and γ-ray singles and coincidence measurements allowed to establish a quasicomplete decay scheme of this nucleus. By comparing the proton intensity to different daughter states, tentative spin assignments have been made for some of the states of Cl33. The Gamow-Teller strength distribution is deduced and compared to shell-model calculations and a quenching factor is determined. States close to the isobaric analog state are searched for with respect to isospin mixing. © 2010 The American Physical Society., This work was partly funded by the Conseil régional d’Aquitaine and the EU through the Human Capital and Mobility program. We acknowledge support from CICYT via contract FPA2007-62179. RDR was supported via a FPI grant.

Published
2010

25. R-matrix analysis of the β decays of N12 and B12

Author

Hyldegaard, S., Alcorta, Martín, García Borge, María José, Boutami, Rafik, Fraile, Luis M., Madurga, Miguel, Tengblad, Olof, and Äystö, Juha

Abstract

The β decays of N12 and B12 have been studied at KVI and JYFL to resolve the composition of the broad and interfering 0+ and 2 + strengths in the triple-α continuum. For the first time a complete treatment of 3α decay is presented including all major breakup channels. A multilevel, many-channel R-matrix formalism has been developed for the complete description of the breakup in combination with the recently published separate analysis of angular correlations. We find that, in addition to the Hoyle state at 7.65 MeV, more than one 0+ and 2+ state is needed to reproduce the spectra. Broad 03+ and 22+ states are found between 10.5 and 12 MeV in this work. The presence of β strength up to the N12 Q-value window suggests the presence of additional 0+ and 2 + components in the C12 structure at energies above 12.7 MeV. © 2010 The American Physical Society., Supported by the Academy of Finland (Project No. 44875), by the Spanish Agency CICYT (Nos. FPA2005-02379 and FPA2007-62216) and MEC Consolider Project No. CSD2007-00042, by the Belgian IAP P6/23 project and FWO-Vlaanderen, by the European Union sixth Framework Programme “EURONS”(No. 506065), and by the Swedish Research Council and the Knut and Alice Wallenberg Foundation. T.N. is a Royal Swedish Academy of Sciences Research Fellow supported by a grant from the Knut and Alice Wallenberg Foundation. The work at KVI was performed as part of Program 48 (TRIµP) of the Stichting voor Fundamenteel Onderzoek der Materie (FOM).

Published
2010

26. Breakup of C12 resonances into three α particles

Author

Kirsebom, O.S., Alcorta, Martín, García Borge, María José, Cubero, M., Domínguez-Reyes, Ricardo, Fraile, Luis M., Madurga, Miguel, Muñoz-Martín, A., Perea, Ángel, and Tengblad, Olof

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

The reaction 3He+11B→d+12C* has been used to populate resonances in C12 up to an excitation energy of 15 MeV. The subsequent breakup to three α particles has been measured in complete kinematics. Dalitz plots are used to visualize and analyze the data. The Dalitz plot intensity distribution exhibits zero points characteristic of the total spin and parity of the 3α system allowing us to determine the spin and parity of a state in C12 at 13.35 MeV whose quantum numbers were hitherto not well established. The Dalitz plot intensity distributions of the 2- state at 11.83 MeV and the 1 + state at 12.71 MeV are compared with the predictions of a recent three-body calculation as well as with simpler models. All are able to reproduce the gross structures seen in the Dalitz plot, but none give an accurate description of the detailed profile of the distributions. © 2010 The American Physical Society., support of the Spanish CICYT research grant FPA2007-62170 and the MICINN Consolider Project CSD 2007-00042 as well as the support of the European Union VI Framework through RII3-EURONS/JRA4-DLEP (Contract No. 506065)

Published
2010

27. Dynamic studies of 11Li and its core 9Li on 208Pb near the Coulomb barrier

Author

Cubero, M, Borge, M. J. G., Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Diget, C., Galaviz, D., Fernández García, Juan Pablo, Gómez Camacho, Joaquín José, Lay Valera, José Antonio, Madurga, Miguel, Moro Muñoz, Antonio Matías, Mukha, I., and Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear

Subjects
Nuclear Theory, Halo nuclei, 9Li, Breakup channel, Elastic scattering, Nuclear Experiment, 11Li
Abstract

We measured the scattering of the halo nucleus 11Li and its core 9Li on the lead target at TRIUMF at energies below and around to the Coulomb barrier. We report here on our preliminary analysis of the inclusive breakup reaction.

Published
2010

28. Mapping of the C-12* states via the B-10(He-3,pααα) reaction

Author

García Borge, María José, Alcorta, Martín, Fynbo, H.O.U., García, Gustavo, Jeppesen, Henrik B., Kirsebom, O., Madurga, Miguel, Nyman, G., Obradors, Diego, and Tengblad, Olof

Subjects
[PACS] Properties of nuclei, nuclear energy levels, [PACS] Spin, parity, and isobaric spin, 6 ≤ A ≤ 19 [[PACS] Properties of specific nuclei listed by mass ranges], [PACS] 3H-, 3He-, and 4He- induced reactions, [PACS] Properties of specific nuclei listed by mass ranges: 6 ≤ A ≤ 19
Abstract

4 pages, 4 figures.-- PACS nrs.: 21.10.-k, 21.10.Hw, 25.55.-e, 27.20.+n., We have studied C-12 in full kinematics via the B-10(He-3,pααα) reaction at an energy of 2.45 MeV. In our data we have identified states in C-12 from the ground state up to about 18 MeV, with spins ranging from 0 to 4. Due to the very good resolution, we are able to determine properties of these C-12 resonances, such as their energy, width, and spin. In this contribution preliminary results from the ongoing analysis are presented. Main focus on the precise determination of the breakup spectra for all resonances., This work has been made possible by the CSIC I3P program, and is supported by the European Union under the Sixth framework project EURONS-contract No. 506065.

Published
2007

29. Mapping of the 12C∗ states of astrophysical interest via the 10B(3He,pααα) Reaction

Author

Alcorta, Martín, Jeppesen, Henrik B., García Borge, María José, Fynbo, H.O.U., García, Gustavo, Kirsebom, O., Madurga, Miguel, Nyman, G., Obradors, Diego, Tengblad, Olof, and Consejo Superior de Investigaciones Científicas (España)

Abstract

5 pags., 2 figs. -- International Symposium on Nuclear Astrophysics - Nuclei in the Cosmos - IX 25-30 June 2006 CERN, We have studied 12C in full kinematics via the 10B( 3He,pααα) reaction at 2.45 MeV. In our data we have identified states in 12C from the ground state up to about 18 MeV, with spins ranging from 0 to 4. Due to the very good resolution, we are able to determine properties of these 12C resonances, such as their energy, width, and spin. In this contribution preliminary results from the ongoing analysis is presented., This work has been made possible by the CSIC I3P program, and is supported by the European Union under the Sixth framework project EURONS-contract number 506065.

Published
2006

30. ß-decay studies of states in 12C

Author

Pedersen, S.G., Alcorta, Martín, García Borge, María José, Brandenburg, S., Büscher, J., Dendooven, P., Diget, C. Aa., Van Duppen, P., Fulton, B., Fynbo, H.O.U., Huyse, M., Jokinen, A., Jonson, B., Jungmann, K., Madurga, Miguel, Nyman, G., Onderwater, C.J.G., Perajärvi, K., Raabe, R., Riisager, K., Rogachevskiy, A., Saastamoinen, A., Sohani, M., Tengblad, Olof, Traykov, E., Wilschut, H.W., and Äystö, J.

Abstract

5 pags., 1 fig., 1 tab. -- International Symposium on Nuclear Astrophysics - Nuclei in the Cosmos - IX, June 25-30 2006, CERN, Geneva, Switzerland, The interest in experimental studies of the 12C nucleus is partly due to the astrophysical interest in its spectroscopic properties, which determine the triple alpha reaction rate, and partly motivated by the structure of this nucleus, which is not fully explained theoretically. Some aspects are described in the shell model and others by a cluster structure of three alpha particles, but both cannot so far be combined in a unified model. New experiments have been performed to address these problems. The focus of this work is on an implantation experiment, which took place in April 2006 at KVI.

Published
2006

31. Study of the break-up channel in 11Li+208Pb collisions at energies around the Coulomb barrier

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Fernández García, Juan Pablo, Cubero, M., Rodríguez Gallardo, Manuela, Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Borge, M. J. G., Buchmann, L., Diget, C. A., Gómez Camacho, Joaquín José, Moro Muñoz, Antonio Matías, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Fernández García, Juan Pablo, Cubero, M., Rodríguez Gallardo, Manuela, Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Borge, M. J. G., Buchmann, L., Diget, C. A., Gómez Camacho, Joaquín José, and Moro Muñoz, Antonio Matías

Abstract

We present a study of 11Li+208 Pb collisions at energies around the Coulomb barrier (Elab = 24.3 and 29.8 MeV), measured at the post-accelerated beam facility, ISAC II, at TRIUMF (Vancouver, Canada). A remarkably large yield of 9Li has been observed, a result that is attributed to the weak binding of the 11Li nucleus. The angular distribution of this 9Li yield, relative to the elastic one, has been analysed in terms of first-order semiclassical calculations as well as four-body and three-body Continuum-Discretized Coupled-Channels (CDCC) calculations, based on a three-body and di-neutron model of the 11Li nucleus, respectively. The calculations reproduce well the trend of the data and support the existence of a large concentration of B (E1) strength at very low excitation energies. The connection of this large B (E1) with a possible low-lying dipole resonance is discussed.

Published
2014

32. Study of the break-up channel in 11Li+208Pb collisions at energies around the Coulomb barrier

Author

Fernández-García, J. P., Cubero, M., Rodríguez Gallardo, Manuela, Acosta, Luis, Alcorta, Martín, Álvarez, M. A. G., García Borge, María José, Galaviz, D., Gómez-Camacho, Joaquín, Lay, J. A., Madurga, Miguel, Martel, Ismael, Moro, A.M., Sánchez-Benítez, A. M., Tengblad, Olof, Fernández-García, J. P., Cubero, M., Rodríguez Gallardo, Manuela, Acosta, Luis, Alcorta, Martín, Álvarez, M. A. G., García Borge, María José, Galaviz, D., Gómez-Camacho, Joaquín, Lay, J. A., Madurga, Miguel, Martel, Ismael, Moro, A.M., Sánchez-Benítez, A. M., and Tengblad, Olof

Abstract

We present a study of 11Li+208Pb collisions at energies around the Coulomb barrier (Elab = 24.3 and 29.8 MeV), measured at the post-accelerated beam facility, ISAC II, at TRIUMF (Vancouver, Canada). A remarkably large yield of 9Li has been observed, a result that is attributed to the weak binding of the 11Li nucleus. The angular distribution of this 9Li yield, relative to the elastic one, has been analysed in terms of first-order semiclassical calculations as well as four-body and three-body Continuum-Discretized Coupled-Channels (CDCC) calculations, based on a three-body and di-neutron model of the 11Li nucleus, respectively. The calculations reproduce well the trend of the data and support the existence of a large concentration of B(E1) strength at very low excitation energies. The connection of this large B(E1) with a possible low-lying dipole resonance is discused.

Published
2014

33. New AMS method to measure the atom ratio 146Sm/147Sm for a half-life determination of 146Sm

Author

Kinoshita, Norikazu, Paul, Michael, Alcorta, Martín, Bowers, Matthew, Collon, P., Deibel, C., DiGiovine, B., Goriely, Stéphane, Greene, John P., Henderson, Dale J., Jiang, Cheng-Lie, Kashiv, Yoav, Kay, B.P, Lee, H-Y, Marley, Scott, Nakanishi, Takashi, Pardo, Richard C., Patel, Nilesh, Rehm, Karl E., Robertson, Donald, Scott, Roger, Schmitt, Christian, Tang, X.D, Ugalde, Claudio, Vondrasek, Richard C., Kinoshita, Norikazu, Paul, Michael, Alcorta, Martín, Bowers, Matthew, Collon, P., Deibel, C., DiGiovine, B., Goriely, Stéphane, Greene, John P., Henderson, Dale J., Jiang, Cheng-Lie, Kashiv, Yoav, Kay, B.P, Lee, H-Y, Marley, Scott, Nakanishi, Takashi, Pardo, Richard C., Patel, Nilesh, Rehm, Karl E., Robertson, Donald, Scott, Roger, Schmitt, Christian, Tang, X.D, Ugalde, Claudio, and Vondrasek, Richard C.

Abstract

The extinct p-process nuclide 146Sm (t1/2 = 103 ± 5 Myr) is known to have been present in the Early-Solar System and has been proposed as an astrophysical chronometer. 146Sm is also intensely used to date meteorite and planetary differentiation processes, enhancing the importance of an accurate knowledge of the 146Sm half-life. We are engaged in a new determination of the 146Sm half-life in which the 146Sm/147Sm atom ratio is determined by accelerator mass spectrometry at the ATLAS facility of Argonne National Laboratory. In order to reduce systematic errors in the AMS determination of the 146Sm/147Sm ratios (in the range of 10-7-10-9), 146Sm and 147Sm ions were alternately counted in the same detector in the focal plane of a gas-filled magnet, respectively in continuous-wave and attenuated mode. Quantitative attenuation is obtained with the 12 MHz pulsed and ns-bunched ATLAS beam by chopping beam pulses with an RF sweeper in a ratio (digitally determined) down to 1:106. The experiments and preliminary results are discussed. © 2012 Elsevier B.V. All rights reserved., SCOPUS: cp.j, info:eu-repo/semantics/published

Published
2013

34. Li11 breakup on Pb208 at energies around the coulomb barrier

Author

Centro Nacional de Física de Partículas, Astropartículas y Nuclear (España), Ministerio de Economía y Competitividad (España), Fernández-García, J. P., Cubero, M., Rodríguez Gallardo, Manuela, Acosta, Luis, Alcorta, Martín, Álvarez, M. A. G., García Borge, María José, Gómez-Camacho, Joaquín, Lay, J. A., Madurga, Miguel, Martel, Ismael, Moro, A.M., Mukha, I., Sánchez-Benítez, A. M., Tengblad, Olof, Centro Nacional de Física de Partículas, Astropartículas y Nuclear (España), Ministerio de Economía y Competitividad (España), Fernández-García, J. P., Cubero, M., Rodríguez Gallardo, Manuela, Acosta, Luis, Alcorta, Martín, Álvarez, M. A. G., García Borge, María José, Gómez-Camacho, Joaquín, Lay, J. A., Madurga, Miguel, Martel, Ismael, Moro, A.M., Mukha, I., Sánchez-Benítez, A. M., and Tengblad, Olof

Abstract

The inclusive breakup for the Li11+Pb208 reaction at energies around the Coulomb barrier has been measured for the first time. A sizable yield of Li9 following the Li11 dissociation has been observed, even at energies well below the Coulomb barrier. Using the first-order semiclassical perturbation theory of Coulomb excitation it is shown that the breakup probability data measured at small angles can be used to extract effective breakup energy as well as the slope of B(E1) distribution close to the threshold. Four-body continuum-discretized coupled-channels calculations, including both nuclear and Coulomb couplings between the target and projectile to all orders, reproduce the measured inclusive breakup cross sections and support the presence of a dipole resonance in the Li11 continuum at low excitation energy. © 2013 American Physical Society.

Published
2013

35. DHalo nuclei follow rutherford elastic scattering at energies below the barrier? the case of 11Li

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Educación y Ciencia (MEC). España, Fernández García, Juan Pablo, Rodríguez Gallardo, Manuela, González Álvarez, Marcos Aurelio, Moro Muñoz, Antonio Matías, Lay Valera, José Antonio, Cubero, M., Acosta, Luis, Alcorta, Martín, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Educación y Ciencia (MEC). España, Fernández García, Juan Pablo, Rodríguez Gallardo, Manuela, González Álvarez, Marcos Aurelio, Moro Muñoz, Antonio Matías, Lay Valera, José Antonio, Cubero, M., Acosta, Luis, and Alcorta, Martín

Abstract

The first measurement of the elastic scattering of the halo nucleus 11Li and its core 9Li on 208Pb at energies near the Coulomb barrier is presented. The 11Li+208Pb elastic scattering shows a strong reduction with respect to the Rutherford cross section, even at energies well below the barrier and down to very small scattering angles. This drastic change of the elastic differential cross section observed in 11Li+208Pb is the consequence of the halo structure of 11Li, as it is not observed in the elastic scattering of its core 9Li at the same energies. Four-body continuum-discretized coupled-channels calculations, based on a three-body model of the 11Li projectile, are found to explain the measured angular distributions and confirm that the observed reduction is mainly due to the strong Coulomb coupling to the dipole states in the low-lying continuum of 11Li. These calculations suggest the presence of a low-lying dipole resonance in 11Li close to the breakup threshold.

Published
2012

36. Scattering of the halo nucleus 11Li and its core 9Li on 208Pb at energies around the Coulomb barrier

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Borge, M. J. G., Cubero, M, Fernández García, Juan Pablo, Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Buchmann, L., Diget, C. A., Al Falou, H., Gómez Camacho, Joaquín José, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Borge, M. J. G., Cubero, M, Fernández García, Juan Pablo, Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Buchmann, L., Diget, C. A., Al Falou, H., and Gómez Camacho, Joaquín José

Abstract

The first measurement of the elastic scattering of the halo nucleus 11Li and its core 9Li on 208Pb at energies around the Coulomb barrier is presented. The 11Li reaction showed a large cross section for the breakup channel, even at energies well below the barrier. The analysis of the 11Li + 208Pb scattering data in terms of the continuum-discretized coupled-channel calculations indicates that the effect of the coupling to the breakup channels produces a strong suppression of the elastic cross section at energies above and below the barrier. This effect is mainly due to the strong Coulomb coupling to the dipole states in the low-lying continuum of 11Li.

Published
2012

37. Astrophysical S factor for the He-4(He-3,gamma)Be-7 reaction at medium energies

Author

Carmona Gallardo, M., Singh, B.S.N., Tengblad, Olof, Hass, M., Alcorta, Martín, García Borge, María José, Briz, José Antonio, Cruz, C., Cubero, M., Domínguez-Reyes, Ricardo, Fulton, B.R., Fynbo, H.O.U., Gordillo, N., Haquin, G., Nir-El, Y., Kumar, V., Maira-Vidal, A., McGrath, J., Muñoz-Martín, A., Perea, Ángel, Yungreis, Z., Carmona Gallardo, M., Singh, B.S.N., Tengblad, Olof, Hass, M., Alcorta, Martín, García Borge, María José, Briz, José Antonio, Cruz, C., Cubero, M., Domínguez-Reyes, Ricardo, Fulton, B.R., Fynbo, H.O.U., Gordillo, N., Haquin, G., Nir-El, Y., Kumar, V., Maira-Vidal, A., McGrath, J., Muñoz-Martín, A., Perea, Ángel, and Yungreis, Z.

Abstract

The astrophysical S factor for the He-4(He-3,gamma)Be-7 direct capture reaction plays a major role in the context of solar neutrino flux and primordial Li-7 abundances that demand accurate information on the reaction. We report here our recent cross section measurements using the activation method in the region of E-CM=900-2800 keV, that aim to shed light on the discrepancies in the existing data and lead to a more accurate extrapolation of the S factor.

Published
2012

38. Analysis of breakup channel for the 11Li+208Pb reaction at energies around the Coulomb barrier

Author

Fernández-García, J. P., Cubero, M., Lay, J. A., Acosta, Luis, Alcorta, Martín, Álvarez, M. A. G., García Borge, María José, Galaviz, D., Gómez-Camacho, Joaquín, Madurga, Miguel, Martel, Ismael, Moro, A.M., Mukha, I., Sánchez-Benítez, A. M., Tengblad, Olof, Fernández-García, J. P., Cubero, M., Lay, J. A., Acosta, Luis, Alcorta, Martín, Álvarez, M. A. G., García Borge, María José, Galaviz, D., Gómez-Camacho, Joaquín, Madurga, Miguel, Martel, Ismael, Moro, A.M., Mukha, I., Sánchez-Benítez, A. M., and Tengblad, Olof

Published
2012

39. Do halo nuclei follow Rutherford elastic scattering at energies below the barrier? The case of 11Li

Author

Cubero, M., Fernández-García, J. P., Alcorta, Martín, Álvarez, M. A. G., García Borge, María José, Gómez-Camacho, Joaquín, Madurga, Miguel, Mukha, I., Tengblad, Olof, Cubero, M., Fernández-García, J. P., Alcorta, Martín, Álvarez, M. A. G., García Borge, María José, Gómez-Camacho, Joaquín, Madurga, Miguel, Mukha, I., and Tengblad, Olof

Abstract

The first measurement of the elastic scattering of the halo nucleus Li11 and its core Li9 on Pb208 at energies near the Coulomb barrier is presented. The Li11+Pb208 elastic scattering shows a strong reduction with respect to the Rutherford cross section, even at energies well below the barrier and down to very small scattering angles. This drastic change of the elastic differential cross section observed in Li11+Pb208 is the consequence of the halo structure of Li11, as it is not observed in the elastic scattering of its core Li9 at the same energies. Four-body continuum-discretized coupled-channels calculations, based on a three-body model of the Li11 projectile, are found to explain the measured angular distributions and confirm that the observed reduction is mainly due to the strong Coulomb coupling to the dipole states in the low-lying continuum of Li11. These calculations suggest the presence of a low-lying dipole resonance in Li11 close to the breakup threshold. © 2012 American Physical Society.

Published
2012

40. New AMS Method to Measure the Atom Ratio 146Sm/147Sm for a Half-life Determination of 146Sm

Author

Kinoshita, Norikazu, Paul, Michael, Alcorta, Martín, Bowers, Matthew, Collon, P., Deibel, C., DiGiovine, B., Goriely, Stéphane, Greene, John P., Henderson, Dale J., Jiang, Cheng-Lie, Kashiv, Yoav, Kay, B.P, Lee, H-Y, Marley, Scott, Nakanishi, Takashi, Pardo, Richard C., Patel, Nilesh, Rehm, Karl E., Robertson, Darren, Scott, Ryan, Schmitt, Christian, Tang, X.D, Ugalde, Claudio, Vondrasek, Richard C., Kinoshita, Norikazu, Paul, Michael, Alcorta, Martín, Bowers, Matthew, Collon, P., Deibel, C., DiGiovine, B., Goriely, Stéphane, Greene, John P., Henderson, Dale J., Jiang, Cheng-Lie, Kashiv, Yoav, Kay, B.P, Lee, H-Y, Marley, Scott, Nakanishi, Takashi, Pardo, Richard C., Patel, Nilesh, Rehm, Karl E., Robertson, Darren, Scott, Ryan, Schmitt, Christian, Tang, X.D, Ugalde, Claudio, and Vondrasek, Richard C.

Abstract

The extinct p-process nuclide 146Sm (t1/2 = 103 ± 5 Myr) is known to have been present in the Early-Solar System and has been proposed as an astrophysical chronometer. 146Sm is also intensely used to date meteorite and planetary differentiation processes, enhancing the importance of an accurate knowledge of the 146Sm half-life. We are engaged in a new determination of the 146Sm half-life in which the 146Sm/147Sm atom ratio is determined by accelerator mass spectrometry at the ATLAS facility of Argonne National Laboratory. In order to reduce systematic errors in the AMS determination of the 146Sm/147Sm ratios (in the range of 10 7–10 9), 146Sm and 147Sm ions were alternately counted in the same detector in the focal plane of a gas-filled magnet, respectively in continuous-wave and attenuated mode. Quanti- tative attenuation is obtained with the 12 MHz pulsed and ns-bunched ATLAS beam by chopping beam pulses with an RF sweeper in a ratio (digitally determined) down to 1:106. The experiments and prelimin- ary results are discussed., info:eu-repo/semantics/published

Published
2012

41. The spectroscopic study of 33Ar

Author

Adimi, N., Domínguez-Reyes, Ricardo, Alcorta, Martín, Bey, A., Blank, B., García Borge, María José, Oliveira Santos, F. de, Dossat, C., Fynbo, H.O.U., Giovinazzo, J., Knudsen, H. H., Madurga, Miguel, Matea, I., Perea, Ángel, Sümmerer, K., Tengblad, Olof, Thomas, J.C., Adimi, N., Domínguez-Reyes, Ricardo, Alcorta, Martín, Bey, A., Blank, B., García Borge, María José, Oliveira Santos, F. de, Dossat, C., Fynbo, H.O.U., Giovinazzo, J., Knudsen, H. H., Madurga, Miguel, Matea, I., Perea, Ángel, Sümmerer, K., Tengblad, Olof, and Thomas, J.C.

Abstract

The proton-rich nucleus 33Ar has been produced at the low-energy facility SPIRAL at GANIL. Spectroscopic studies of gamma and p emission of this nucleus were performed with the >Silicon Cube> detection system. The analysis of proton and gamma singles and coincidence spectra allowed us to establish a complete decay scheme of this nucleus. The comparison of the Gamow-Teller strength distribution deduced from our experiment and the theoretical one obtained with the Shell Model permitted the determination of a quenching factor for the Gamow-Teller strength.

Published
2011

42. The 8Li + 2H reaction studied in inverse kinematics at 3.15 MeV/nucleon using the REX-ISOLDE post-accelerator

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Ciencia e Innovación (MICIN). España, European Union (UE), Tengborn, E., Moro Muñoz, Antonio Matías, Nilsson, T., Alcorta, Martín, García Borge, María José, Cederkäll, J., Gómez Camacho, Joaquín José, Wenander, F., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Ciencia e Innovación (MICIN). España, European Union (UE), Tengborn, E., Moro Muñoz, Antonio Matías, Nilsson, T., Alcorta, Martín, García Borge, María José, Cederkäll, J., Gómez Camacho, Joaquín José, and Wenander, F.

Abstract

The reaction 8Li + 2H has been studied in inverse kinematics at the incident energy of 3.15 MeV/nucleon, using the REX-ISOLDE post-accelerator. The reaction channels corresponding to (d,p), (d,d), and (d,t) reactions populating ground states and low-lying excited states in 7 -9Li have been identified and the related angular distributions extracted and compared with coupled-channels, distorted-wave Born approximation (DWBA), and coupled-reaction-channels calculations. For the inelastic and (d,t) channels we find that higher order effects are very important and hence one needs to go beyond the simple DWBA to extract reliable structure information from these processes.

Published
2011

43. Elastic scattering of 9Li on 208Pb at energies around the Coulomb barrier

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Cubero, M., Fernández García, Juan Pablo, Lay Valera, José Antonio, Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Borge, M. J. G., Buchmann, L., Diget, C. A., Fulton, B., Gómez Camacho, Joaquín José, Moro Muñoz, Antonio Matías, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Cubero, M., Fernández García, Juan Pablo, Lay Valera, José Antonio, Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Borge, M. J. G., Buchmann, L., Diget, C. A., Fulton, B., Gómez Camacho, Joaquín José, and Moro Muñoz, Antonio Matías

Abstract

We have studied the dynamical effects of the halo structure of 11Li on the scattering on heavy targets at energies around the Coulomb barrier. This experiment was performed at ISAC-II at TRIUMF with a world record in production of the post-accelerated 11Li beam. As part of this study we report here on the first measurement of the elastic cross section of the core nucleus, i.e. 9Li on 208Pb, at energies around the Coulomb barrier. A preliminary optical model analysis has been performed in order to extract a global optical potential to describe the measured angular distributions.

Published
2011

44. Study of the scattering of halo nuclei around the Coulomb barrier

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Ciencia y Tecnología (MCYT). España, Ministerio de Educación y Ciencia (MEC). España, Acosta, Luis, Cubero, M., Escrig, D., Fernández García, Juan Pablo, Lay Valera, José Antonio, Moro Muñoz, Antonio Matías, Rodríguez Gallardo, Manuela, Sánchez Benítez, A. M., Alcorta, Martín, González Álvarez, Marcos Aurelio, Andrés Martín, María Victoria, Cortés Giraldo, Miguel Antonio, Espino Navas, José Manuel, Gómez Camacho, Joaquín José, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Ciencia y Tecnología (MCYT). España, Ministerio de Educación y Ciencia (MEC). España, Acosta, Luis, Cubero, M., Escrig, D., Fernández García, Juan Pablo, Lay Valera, José Antonio, Moro Muñoz, Antonio Matías, Rodríguez Gallardo, Manuela, Sánchez Benítez, A. M., Alcorta, Martín, González Álvarez, Marcos Aurelio, Andrés Martín, María Victoria, Cortés Giraldo, Miguel Antonio, Espino Navas, José Manuel, and Gómez Camacho, Joaquín José

Abstract

During the past ten years the present collaboration has carried out several experiments related with the study of radioactive nuclei. One of the topics in which we have centered our research, is the scattering of halo nuclei at energies around the Coulomb barrier. As part of this study, we present in this work a review of the results obtained from the scattering of 6He, 11Be and 11Li. The presence of a "halo" in these exotic nuclei is found to have a striking effect on the dynamics of these reactions, making their study an interesting experimental problem and a challenge for existing reaction theories.

Published
2011

45. New AMS Method to Measure the Atom Ratio 146Sm/147Sm for a Half-life Determination of 146Sm

Author

Kinoshita, Norikazu, Paul, Michael, Alcorta, Martín, Bowers, Matthew, Collon, P., Deibel, C., DiGiovine, S., Goriely, Stéphane, Greene, John P., Henderson, Dale J., Jiang, Cheng-Lie, Kashiv, Yoav, Kay, B.P, Lee, H-Y, Nakanishi, Takashi, Pardo, Richard C., Patel, Nilesh, Rehm, Karl E., Robertson, Donald, Scott, Roger, Schmitt, Christian, Tang, X.D, Vondrasek, Richard C., Kinoshita, Norikazu, Paul, Michael, Alcorta, Martín, Bowers, Matthew, Collon, P., Deibel, C., DiGiovine, S., Goriely, Stéphane, Greene, John P., Henderson, Dale J., Jiang, Cheng-Lie, Kashiv, Yoav, Kay, B.P, Lee, H-Y, Nakanishi, Takashi, Pardo, Richard C., Patel, Nilesh, Rehm, Karl E., Robertson, Donald, Scott, Roger, Schmitt, Christian, Tang, X.D, and Vondrasek, Richard C.

Abstract

info:eu-repo/semantics/published

Published
2011

46. Study of the scattering of halo nuclei around the Coulomb barrier

Author

Acosta, Luis, Cubero, M., Escrig, Diego, Fernández-García, J. P., Lay, J. A., Moro, A.M., Rodríguez Gallardo, Manuela, Sánchez-Benítez, A. M., Alcorta, Martín, Álvarez, M. A. G., Andrés, María Victoria, García Borge, María José, Cortés-Giraldo, Miguel Antonio, Galaviz, D., García Ramos, José Enrique, Gómez-Camacho, Joaquín, Madurga, Miguel, Maira-Vidal, A., Martel, Ismael, Mukha, I., Pérez-Bernal, Francisco, Reillo, Eva María, Rusek, K., Tengblad, Olof, Acosta, Luis, Cubero, M., Escrig, Diego, Fernández-García, J. P., Lay, J. A., Moro, A.M., Rodríguez Gallardo, Manuela, Sánchez-Benítez, A. M., Alcorta, Martín, Álvarez, M. A. G., Andrés, María Victoria, García Borge, María José, Cortés-Giraldo, Miguel Antonio, Galaviz, D., García Ramos, José Enrique, Gómez-Camacho, Joaquín, Madurga, Miguel, Maira-Vidal, A., Martel, Ismael, Mukha, I., Pérez-Bernal, Francisco, Reillo, Eva María, Rusek, K., and Tengblad, Olof

Abstract

During the past ten years the present collaboration has carried out several experiments related with the study of radioactive nuclei. One of the topics in which we have centered our research, is the scattering of halo nuclei at energies around the Coulomb barrier. As part of this study, we present in this work a review of the results obtained from the scattering of 6He, 11Be and 11Li. The presence of a >halo> in these exotic nuclei is found to have a striking effect on the dynamics of these reactions, making their study an interesting experimental problem and a challenge for existing reaction theories.

Published
2011

47. Elastic Scattering of 9Li on 208Pb at energies around the Coulomb barrier.

Author

Cubero, M., García Borge, María José, Alcorta, Martín, Tengblad, Olof, Walden, P., Mukha, I., Cubero, M., García Borge, María José, Alcorta, Martín, Tengblad, Olof, Walden, P., and Mukha, I.

Abstract

We have studied the dynamical effects of the halo structure of 11Li on the scattering on heavy targets at energies around the Coulomb barrier. This experiment was performed at ISAC‐II at TRIUMF with a world record in production of the post‐accelerated 11Li beam. As part of this study we report here on the first measurement of the elastic cross section of the core nucleus, i.e. 9Li on 208Pb, at energies around the Coulomb barrier. A preliminary optical model analysis has been performed in order to extract a global optical potential to describe the measured angular distributions. © 2011 American Institute of Physics

Published
2011

48. Scattering of 9Li on 208Pb at energies around the Coulomb barrier

Author

Cubero, M., Fernández García, J. P., Lay, J. A., Acosta, Luis, Alcorta, Martín, Madurga, Miguel, García Borge, María José, Mukha, I., Tengblad, Olof, Walden, P., Cubero, M., Fernández García, J. P., Lay, J. A., Acosta, Luis, Alcorta, Martín, Madurga, Miguel, García Borge, María José, Mukha, I., Tengblad, Olof, and Walden, P.

Abstract

In order to study the dynamics of 11Li and 9Li beams in a strong electric field at energies around the Coulomb barrier, we measured at the ISACII-TRIUMF Facility the angular distribution of elastic and inelastic scattering of 11Li+208Pb at 24.2 and 29.7 MeV and 9Li+208Pb at 24, 29.5 and 33 MeV laboratory energies. We present here the first determination of the angular distribution of the cross section of 9Li+208Pb. The results are compared with theoretical calculations using the double-folding São Paulo Potential (SPP) for the real part and a for the imaginary part a Woods-Saxon potential. A good overall agreement is obtained.

Published
2011

49. Dynamic studies of 11Li and its core 9Li on 208Pb near the Coulomb barrier

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Cubero, M, Borge, M. J. G., Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Diget, C., Galaviz, D., Fernández García, Juan Pablo, Gómez Camacho, Joaquín José, Lay Valera, José Antonio, Madurga, Miguel, Moro Muñoz, Antonio Matías, Mukha, I., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Cubero, M, Borge, M. J. G., Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Diget, C., Galaviz, D., Fernández García, Juan Pablo, Gómez Camacho, Joaquín José, Lay Valera, José Antonio, Madurga, Miguel, Moro Muñoz, Antonio Matías, and Mukha, I.

Abstract

We measured the scattering of the halo nucleus 11Li and its core 9Li on the lead target at TRIUMF at energies below and around to the Coulomb barrier. We report here on our preliminary analysis of the inclusive breakup reaction.

Published
2010

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