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1. j - 1 ANOMALOUS STATES AND ELECTROMAGNETIC TRANSITION RATES IN THE NEUTRON MID-SHELL Ag NUCLEI.

Author

Lalkovski, S., Kisyov, S., and Yordanov, O.

Subjects
NEUTRONS, QUADRUPOLES, VIBRATORS, SILVER
Abstract

The neutron mid-shell silver nuclei exhibit anomalous ordering of the (7/2+, 9/2+) states. The two states are part of the πg-39/2 multiplet split under an unusually strong QQ interaction, leading to a rearrangement of the multiplet structure typical of the semi-magic Ag nuclei. To study the anomaly evolution with the neutron number, a systematic study of the electromagnetic transition rates was performed, showing that the M1 component of the 9/2+1 → 7/2+1 transition is typically hindered by at least two orders of magnitude with respect to the single-particle estimates, while the B(E2) component is enhanced. The experimental electromagnetic transition rates are systematically consistent with the three-hole valence-shell cluster and quadrupole vibrator coupling formalism developed in the 1970s. [ABSTRACT FROM AUTHOR]

Published
2024
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2. Fast-timing measurements in neutron-rich odd-mass zirconium isotopes using LaBr3:Ce detectors coupled with Gammasphere

Author

Gamba E.R., Lalkovski S., Rudigier M., Bruce A.M., Bottoni S., Carpenter M.P., Zhu S., Ayangeakaa A.D., Anderson J.T., Berry T.A., Burrows I., Carroll R.J., Copp P., Carmona Gallardo M., Cullen D.M., Daniel T., Greene J.P., Gurgi L.A., Hartley D.J., Ilieva R., Ilieva S., Janssens R.V.F., Kondev F.G., Kröll T., Lane G.J., Lauritsen T., Lazarus I., Lotay G., Fernández Martínez G., Podolyák Zs., Pucknell V., Reed M., Regan P.H., Rohrer J., Sethi J., Seweryniak D., Shand C.M., Simpson J., Smolen M., Stefanova E.A., Vedia V., and Yordanov O.

Subjects
Physics, QC1-999
Abstract

A fast-timing experiment was performed at the Argonne National Laboratory to measure the lifetimes of the lowest lying states of nuclei belonging to the deformed regions around mass number A≃110 and A≃150. These regions were populated via spontaneous fission of 252Cf and the gamma radiation following the decay of excited states in the fission fragments was measured using 51 Gammasphere detectors coupled with 25 LaBr3:Ce detectors. A brief description of the acquisition system and some preliminary results from the fast-timing analysis of the fission fragment 100Zr are presented. The lifetime value of τ = 840(65) ps was found for the 2+ state in 100Zr consistent within one standard deviation of the adopted value with 791 +26 -35ps. This is associated with a quadrupole deformation parameter of 0.36(2) which is within one standard deviation of the literature value of 0.3556+82 -57.

Published
2018
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5. First results studying the transmutation of 129I, 237Np, 238Pu, and 239Pu in the irradiation of an extended natU/Pb-assembly with 2.52 GeV deuterons

Author

Krivopustov, M. I., Pavliouk, A. V., Kovalenko, A. D., Mariin, I. I., Elishev, A. F., Adam, J., Kovalik, A., Batusov, Yu. A., Kalinnikov, V. G., Brudanin, V. B., Chaloun, P., Tsoupko-Sitnikov, V. M., Solnyshkin, A. A., Stegailov, V. I., Gerbish, Sh., Svoboda, O., Dubnicka, Z., Kala, M., Kloc, M., Krasa, A., Kugler, A., Majerle, M., Wagner, V., Brandt, R., Westmeier, W., Robotham, H., Siemon, K., Bielewicz, M., Kilim, S., Szuta, M., Strugalska-Gola, E., Wojeciechowski, A., Hashemi-Nezhad, S. R., Manolopoulou, M., Fragopolou, M., Stoulos, S., Zamani-Valasiadou, M., Jokic, S., Katovsky, K., Schastny, O., Zhuk, I. V., Potapenko, A. S., Safronova, A. A., Lukashevich, Zh. A., Voronko, V. A., Sotnikov, V. V., Sidorenko, V. V., Ensinger, W., Severin, H. D., Batsev, S., Kostov, L., Protokhristov, Kh., Stoyanov, Ch., Yordanov, O., Zhivkov, P. K., Kumar, A. V., Sharma, M., Khilmanovich, A. M., Marcinkevich, B. A., Korneev, S. V., Damdinsuren, Ts., Togoo, Ts., Kumawat, H., and Collaboration “Energy plus Transmutation”

Published
2009
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6. Isomers in neutron-rich A ≈ 190 nuclides from 208Pb fragmentation

Author

Caama no, M., Walker, P. M., Regan, P. H., Pfützner, M., Podolyák, Zs., Gerl, J., Hellström, M., Mayet, P., Mineva, M. N., Aprahamian, A., Benlliure, J., Bruce, A. M., Butler, P. A., Cortina Gil, D., Cullen, D. M., Döring, J., Enqvist, T., Fox, C., Garcés Narro, J., Geissel, H., Gelletly, W., Giovinazzo, J., Górska, M., Grawe, H., Grzywacz, R., Kleinböhl, A., Korten, W., Lewitowicz, M., Lucas, R., Mach, H., O’Leary, C. D., De Oliveira, F., Pearson, C. J., Rejmund, F., Rejmund, M., Sawicka, M., Schaffner, H., Schlegel, C., Schmidt, K., Schmidt, K. -H., Stevenson, P. D., Theisen, Ch., Vivès, F., Warner, D. D., Wheldon, C., Wollersheim, H. J., Wooding, S., Xu, F., and Yordanov, O.

Published
2005
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9. Fast-timing measurements in the ground-state band of ¹¹⁴Pd

Author

Gamba, E. R., Bruce, A. M., Lalkovski, S., Rudigier, M., Bottoni, S., Carpenter, M. P., Zhu, S., Anderson, J. T., Ayangeakaa, A. D., Berry, T. A., Burrows, I., Gallardo, M. Carmona, Carroll, R. J., Copp, P., Cullen, D. M., Daniel, T., Martínez, G. Fernández, Greene, J. P., Gurgi, L. A., Hartley, D. J., Ilieva, R., Ilieva, S., Kondev, F. G., Kröll, T., Lane, G. J., Lauritsen, T., Lazarus, I., Lotay, G., Niţă, C. R., Podolyak, Zs., Pucknell, V., Reed, M., Regan, P. H., Rohrer, J., Sethi, J., Seweryniak, D., Shand, C. M., Simpson, J., Smoleń, M., Stefanova, E. A., Vedia, V., and Yordanov, O.

Abstract

Using a hybrid Gammasphere array coupled to 25 LaBr3(Ce) detectors, the lifetimes of the first three levels of the yrast band in ¹¹⁴Pd populated via ²⁵²Cf decay, have been measured. The measured lifetimes are τ₂+=103(10)ps, τ₄+=22(13)ps, and τ₆+≤10ps for the 2⁺₁, 4⁺₁, and 6⁺₁ levels, respectively. Palladium-114 was predicted to be the most deformed isotope of its isotopic chain, and spectroscopic studies have suggested it might also be a candidate nucleus for low-spin stable triaxiality. From the lifetimes measured in this work, reduced transition probabilities B(E2;J→J−2) are calculated and compared with interacting boson model, projected shell model, and collective model calculations from the literature. The experimental ratio RB(E₂)=B(E2;4⁺₁→2⁺₁)/B(E2;2⁺₁→0⁺₁)=0.80(42) is measured for the first time in ¹¹⁴Pd and compared with the known values RB(E₂) in the palladium isotopic chain: the systematics suggest that, for N=68, a transition from γ-unstable to a more rigid γ-deformed nuclear shape occurs.

Published
2019

10. Fast-timing measurements in the ground-state band of Pd 114

Author

Rohrer, J., Regan, P.H., Ayangeakaa, A.D., Gurgi, L.A., Berry, T.A., Sethi, J., Carpenter, M.P., Bruce, A.M., Carmona Gallardo, M., Vedia, V., Lauritsen, T., Greene, J.P., Shand, C.M., Anderson, J.T., Rudigier, M., Ilieva, S., Copp, P., Lazarus, I., Smoleń, M., Simpson, J., Kondev, F.G., Pucknell, V., Gamba, E.R., Kröll, T., Yordanov, O., Niţǎ, C.R., Stefanova, E.A., Reed, M., Lalkovski, S., Fernández Martínez, G., Seweryniak, D., Ilieva, R., Hartley, D.J., Daniel, T., Lotay, G., Bottoni, S., Cullen, D.M., Burrows, I., Zhu, S., Lane, G.J., Carroll, R.J., and Podolyák, Z.

Abstract

Using a hybrid Gammasphere array coupled to 25 LaBr3(Ce) detectors, the lifetimes of the first three levels of the yrast band in Pd114, populated via Cf252 decay, have been measured. The measured lifetimes are τ2+=103(10)ps, τ4+=22(13)ps, and τ6+≤10ps for the 21+, 41+, and 61+ levels, respectively. Palladium-114 was predicted to be the most deformed isotope of its isotopic chain, and spectroscopic studies have suggested it might also be a candidate nucleus for low-spin stable triaxiality. From the lifetimes measured in this work, reduced transition probabilities B(E2;J→J-2) are calculated and compared with interacting boson model, projected shell model, and collective model calculations from the literature. The experimental ratio RB(E2)=B(E2;41+→21+)/B(E2;21+→01+)=0.80(42) is measured for the first time in Pd114 and compared with the known values RB(E2) in the palladium isotopic chain: the systematics suggest that, for N=68, a transition from γ-unstable to a more rigid γ-deformed nuclear shape occurs.

Published
2019
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11. Investigating the intra-nuclear cascade process using the reaction 136Xe on deuterium at 500 AMeV

Author

Rejmund F., Ricciardi M.V., Pleskač R., Pereira J., Napolitani P., Leray S., Lafriaskh A., Kelić A., Henzlova D., Henzl V., Heinz A., Fernández Ordóñez M., Fernández-Domínguez B., Enqvist T., Casarejos E., Boudard A., Bernas M., Audouin L., Armbruster P., Pérez-Loureiro D., Benlliure J., Alcántara-Núñez J.A., Stéphan C., Schmidt K.-H., Schmitt C., Tassan-Got L., Villagrasa C., Volant C., and Yordanov O.

Subjects
Physics, QC1-999
Abstract

More than 600 residual nuclei, formed in the spallation of 136Xe projectiles impinging on deuterium at 500 AMeV of incident energy, have been unambiguously identified and their production cross sections have been determined with high accuracy. By comparing these data to others previously measured for the reactions 136Xe + p at 1 AGeV and 136Xe + p at 500 AMeV we investigated the role that neutrons play in peripheral collisions and to understand the energy dissipation in frontal collisions in spallation reactions.

Published
2010
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12. Structure of the neutron mid-shell nuclei 111,11347Ag64,66

Author

Lalkovski, S., Stefanova, E.A., Kisyov, S., Korichi, A., Bazzacco, D., Bergstrom, M., Gorgen, A., Herskind, B., Hubel, H., Jansen, A., Khoo, T.L., Kutsarova, T., Lopez-Martens, A., Minkova, A., Podolyak, Zsolt, Schonwasser, G., and Yordanov, O.

Subjects
Condensed Matter::Quantum Gases, Nuclear Theory, Nuclear Experiment
Abstract

111Ag and 113Ag were produced in induced fission reaction, where yrast and near-yrast states were populated. To interpret the new data the Interacting Boson-Fermion model was used. A good agreement with the experimental data is achieved, suggesting that the two Ag nuclei have a well developed collectivity, superimposed on \pi g9/2-3 excitations previously observed throughout the entire isotopic chain.

Published
2017

13. Isotopic production cross sections of residual nuclei in the spallation reaction $^{136}$Xe(200$A$ MeV)+ $p$

Author

Paradela, C., Tassan-Got, L., Benlliure, J., Rodríguez-Sánchez, J.L., Audouin, L., Boudard, A., Casarejos, E., Enqvist, T., Ducret, J.E., Farget, F., Fernández-Domínguez, B., Fernández Ordóñez, M., Giot, L., Heinz, A., Henzl, V., Henzlova, D., Kelić-Heil, A., Lafriaskh, A., Leray, S., Napolitani, P., Pereira, J., Pérez-Loureiro, D., Ricciardi, M.V., Stéphan, C., Schmidt, K.H., Schmitt, C., Villagrasa, C., Volant, C., Yordanov, O., Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Nuclear Theory, Physics::Accelerator Physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; The residual nuclei produced in the spallation reaction of $^{136}$Xe nuclei at 200A MeV on protons have been studied by measuring the isotopic distributions for the elements from cadmium (Z=48) to cesium (Z=55) by using the fragment separator (FRS) spectrometer at GSI and the inverse kinematics technique. This is one of the few measurements performed at such a low projectile energy, close to the validity limit for intranuclear cascade models such as incl or isabel. The experimental results have been compared to these intranuclear cascade codes coupled to the evaporation code abla. Both code combinations reproduce qualitatively the measured isotopic distributions; however, both underestimate the production of residues with mass numbers between 126 and 134. The measured cross sections are of interest for the planning of future radioactive beam or neutron source facilities.

Published
2017
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15. Isotopic yields of spallation residues produced in $^{136}$Xe-induced reactions on deuterium at 500A MeV

Author

Alcántara-Núñez, J.A., Benlliure, J., Paradela, C., Pérez-Loureiro, C., Rodríguez-Sánchez, J. L., Audouin, L., Boudard, A., Casarejos, E., Enqvist, T., Farget, F., Fernández-Ordóñez, M., Heinz, A., Henzl, V., Henzlova, D., Kelić-Heil, A., Lafriaskh, A., Leray, S., Napolitani, P., Pereira, J., Ricciardi, M. V., Stéphan, C., Schmidt, K.-H., Schmitt, C., Tassan-Got, L., Villagrasa, C., Volant, C., Yordanov, O., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 25.40.Sc, 24.10.Lx, 25.70.−z, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015
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16. Isotopic yields of spallation residues produced in $^{136}$Xe-induced reactions on deuterium at 500 A MeV

Author

Alcántara-Núñez, J., Benlliure, J., Fernández-Ordóñez, M., Heinz, A., Henzl, V., Henzlova, D., Kelić-Heil, A., Lafriaskh, A., Leray, S., Napolitani, P., Pereira, J., Ricciardi, M. V., Paradela, C., Stéphan, C., Schmidt, K.-H., Schmitt, C., Tassan-Got, L., Villagrasa, C., Volant, C., Yordanov, O., Pérez-Loureiro, C., Rodríguez-Sánchez, J. L., Audouin, L., Boudard, A., Casarejos, E., Enqvist, T., and Farget, F.

Subjects
ddc:530
Published
2015
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17. Production and $\beta$ half-lives of heavy neutron-rich nuclei approaching the r-process path at N=126

Author

Benlliure, J., Alvarez-Pol, H., Kurtukian Nieto, T., Morales, A.I., Casarejos, E., Cortina-Gil, D., Pereira, J., Becker, F., Borzov, I., Enqvist, T., Henzlova, D., Langanke, K., Martínez-Pinedo, G., Schmidt, K.H., Yordanov, O., Blank, Bertram, Giovinazzo, J., Jurado, B., Audouin, L., Napolitani, P., Fernandez, B., Rejmund, F., Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
[SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR]
Abstract

International audience; Fragmentation reactions of relativistic 238U and 208 Pb projectiles have been used to investigatethe production of heavy neutron-rich nuclei approaching the r-process waiting point at A≈195.The relativistic energies, together with the use of a high resolving-power magnetic spectrometerwere key conditions for the unambiguous identification of nuclei in the region of interest. Usingthis technique we were able to identify 73 new heavy neutron-rich nuclei expanding considerablythe north-west frontier of the chart of nuclide. Moreover, we were able to determine the halflives of 13 of those nuclide. The measured values are signific antly shorter than the predictionsused for r-process model calculations. The confirmation of these results for r-process nuclei atA≈195 would indicate that the r-process at this point is faster than expected, leading to a largerproduction of the heaviest nuclei.

Published
2010

18. Extending the north-east limit of the chart of nuclides

Author

Benlliure, J., Alvarez-Pol, H., Kurtukian Nieto, T., Schmidt, K.H., Audouin, L., Blank, Bertram, Becker, F., Casarejos, E., Cortina-Gil, D., Enqvist, T., Fernandez, B., Fernandez-Ordonez, M., Giovinazzo, J., Henzlova, D., Junghans, A. R., Jurado, B., Napolitani, P., Pereira, J., Rejmund, F., Yordanov, O., Universidade de Santiago de Compostela [Spain] (USC ), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Expérience au GSI; The existence of nuclei with exotic combinations of protons and neutrons provides fundamental information on the forces acting between nucleons. The maximum number of neutrons a given number of protons can bind, neutron drip line1, is only known for the lightest chemical elements, up to oxygen. For heavier elements, the larger its atomic number, the farther from this limit is the most neutron-rich known isotope. The properties of heavy neutron-rich nuclei also have a direct impact on understanding the observed abundances of chemical elements heavier than iron in our Universe. Above half of the abundances of these elements are thought to be produced in rapid-neutron capture reactions, r-process, taking place in violent stellar scenarios2 where heavy neutron-rich nuclei, far beyond the ones known up today, are produced. Here we present a major step forward in the production of heavy neutron-rich nuclei: the discovery of 73 new neutron-rich isotopes of chemical elements between tantalum (Z=72) and actinium (Z=89). This result proves that cold-fragmentation reactions3 at relativistic energies are governed by large fluctuations in isospin and energy dissipation making possible the massive production of heavy neutron-rich nuclei, paving then the way for the full understanding of the origin of the heavier elements in our Universe. It is expected that further studies providing ground and structural properties of the nuclei presented here will reveal further details on the nuclear shell evolution along Z=82 and N=126, but also on the understanding of the stellar nucleosyntheis r-process around the waiting point at A~190 defining the speed of the matter flow towards heavier fissioning nuclei.

Published
2010

19. Production of new neutron rich isotopes of heavy elements in fragmentation reactions of 238U projectiles at 1 AGeV

Author

Alvarez Pol, H., Benlliure, J., Audouin, L., Casarejos, E., Cortina Gil, D., Enqvist, T., Fernandez Dominguez, B., Junghans, A. R., Jurado, B., Napolitani, P., Pereira, J., Rejmund, F., Schmidt, K. H., and Yordanov, O.

Abstract

The production of heavy neutron-rich nuclei has been investigated using cold-fragmentation reactions of U 238 projectiles at relativistic energies. The experiment performed at the high-resolving-power magnetic spectrometer Fragment Separator at GSI made it possible to identify 40 new heavy neutron-rich nuclei: Pt 205 , Au 207−210 , Hg 211−216 , Tl 214−217 , Pb 215−220 , Bi 219−224 , Po 223−227 , At 225−229 , Rn 230,231 , and Fr 233 . The production cross sections of these nuclei were also determined and used to benchmark reaction codes that predict the production of nuclei far from stability.

Published
2010

20. Production of new neutron-rich isotopes of heavy elements in fragmentation reactions of $^{238}$U projectiles at 1 A GeV

Author

Alvarez-Pol, H., Benlliure, J., Audouin, L., Casarejos, E., Cortina-Gil, D., Enqvist, T., Fernandez, B., Junghans, A. R., Jurado, B., Napolitani, P., Pereira, J., Rejmund, F., Schmidt, K.-H., Yordanov, O., Universidade de Santiago de Compostela [Spain] (USC ), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

The production of heavy neutron-rich nuclei has been investigated using cold fragmentation reactions of $^{238}$U projectiles at relativistic energies. The experiment performed at the high-resolving-power magnetic spectrometer FRS at GSI allowed to identify 45 new heavy neutron-rich nuclei: $^{205}$Pt, $^{207-210}$Au, $^{211-216}$Hg, $^{213-217}$Tl, $^{215-220}$Pb, $^{219-224}$Bi, $^{221-227}$Po, $^{224-229}$At, $^{229-231}$Rn and $^{233}$Fr. The production cross sections of these nuclei were also determined and used to benchmark reaction codes that predict the production of nuclei far from stability., 5 pages, 2 figures

Published
2010
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21. First access to $\beta$ half-lives approaching the r-process path near N=126

Author

Kurtukian Nieto, T., Benlliure, J., Audouin, L., Becker, F., Blank, Bertram, Borzov, I.N., Casarejos, E., Fernandez-Ordonez, M., Giovinazzo, J., Henzlova, D., Jurado, B., Langanke, K., Martinez-Pinedo, G., Pereira, J., Rejmund, F., Schmidt, K.-H., Yordanov, O., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut für Kernphysik [Darmstadt], Technische Universität Darmstadt (TU Darmstadt), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Technische Universität Darmstadt - Technical University of Darmstadt (TU Darmstadt), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
25.70.Mn, 27.80.+w, 23.40.-s, 21.10.Tg, 26.30.+k, Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Heavy neutron-rich nuclei close to N=126 were produced by fragmentation of a 1 A GeV 208Pb beam at the FRS at GSI. The beta-decay half-lives of 8 nuclides have been determined. The comparison of the data with model calculations including an approach based on the self-consistent ground-state description and continuum QRPA considering the Gamow-Teller and first-forbidden decays provide a first indication on the importance of first-forbidden transitions around A=195. The measured data indicate that the matter flow in the r-process to heavier fissioning nuclei is faster than previously expected., 4 pages, 4 figures

Published
2008

22. New analysis method to determine $\beta$ decay half-lives: a first step towards the study of heavy neutron-rich nuclei approaching the r-process path near N=126

Author

Kurtukian Nieto, T., Audouin, L., Becker, F., Benlliure, J., Blank, Bertram, Borzov, I.N, Casarejos, E., Fernandez, M., Giovinazzo, J., Henzlova, D., Jurado, B., Langanke, K., Martinez-Pinedo, G., Pereira, J., Rejmund, F., Schmidt, K.-H., Yordanov, O., Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2008

23. Experimental investigation of the residues produced in the 136Xe+Pb and 124Xe+Pb fragmentation reactions at 1A GeV

Author

Henzlova, D., Schmidt, K. H., Ricciardi, M. V., Kelic, A., Henzl, V., Napolitani, P., Audouin, L., Benlliure, J., Boudard, A., Casarejos, E., Ducret, J. E., Enqvist, T., Heinz, A., Junghans, A. R., Jurado, B., Krasa, A., Kurtukian, T., Leray, S., Ordonez, M. F., Pereira, J., Pleskac, R., Rejmund, F., Schmitt, C., Stephan, C., Tassan-Got, L., Villagrasa, C., Volant, C., Wagner, A., and Yordanov, O.

Subjects
cross section residue high-resolution magnetic spectrometer fragment separator FRS GSI, Nuclear Experiment
Abstract

The nuclide cross sections and longitudinal velocity distributions of residues produced in the reactions of 136Xe and 124Xe at 1A GeV in a lead target were measured at the high-resolution magnetic spectrometer, the fragment separator (FRS) of GSI. The data cover a broad range of isotopes of the elements between Z=3 and Z=56 for 136Xe and between Z=5 and Z=55 for 124Xe, reaching down to cross sections of a few microbarns. The velocity distributions exhibit a Gaussian shape for masses above A=20, while more complex behavior is observed for lighter masses. The isotopic distributions for both reactions preserve a memory on the projectile N/Z ratio over the whole residue mass range.

Published
2008

24. Experimental investigation of the residues produced in the 136Xe+Pb and 124Xe+Pb fragmentation reactions at 1 A GeV

Author

HENZLOVA, D., SCHMIDT, K.-H., RICCIARDI, M. V., KELIC, A., HENZL, V., NAPOLITANI, P., AUDOUIN, L., BENLLIURE, J., BOUDARD, A., CASAREJOS, E., DUCRET, J. E., ENQVIST, T., HEINZ, A., JUNGHANS, A., JURADO, B., KRASA, A., KURTUKIAN NIETO, T., LERAY, S., ORDONEZ, M. F., PEREIRA, J., PLESKAC, R., REJMUND, F., SCHMITT, C., STEPHAN, C., TASSAN-GOT, L., VILLAGRASA, C., VOLANT, C., WAGNER, A., YORDANOV, O., Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

This paper presents the nuclide cross sections and the longitudinal velocity distributions of residues produced in the reactions of 136Xe and 124Xe at 1 A GeV in a lead target, measured at the high-resolution magnetic spectrometer, the Fragment Separator (FRS) of GSI. The data cover a broad range of isotopes of the elements between Z = 3 and Z = 56 for 136Xe and between Z = 5 and Z = 55 for 124Xe, reaching down to cross sections of a few microbarns. The velocity distributions exhibit a Gaussian shape for masses above A = 20, while more complex behaviour is observed for lighter masses. The isotopic distributions for both reactions preserve a memory on the projectile N/Z ratio over the whole residue mass range., Comment: 31 pages, 9 figures, 1 table, background information on http://www.gsi.de/charms

Published
2008
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25. Coincidence measurement of residues and light particles in the reaction $^{56}Fe+p$ at 1 GeV per nucleon with SPALADIN

Author

Le Gentil, E., Aumann, T., Bacri, C. O., Benlliure, J., Bianchin, S., Böhmer, M., Boudard, A., Brzychczyk, J., Casarejos, E., Combet, M., Donadille, L., Ducret, J. E., Fernandez-Ordoñez, M., Gernhäuser, R., Johansson, H., Kezzar, K., Kurtukian Nieto, T., Lafriakh, A., Lavaud, F., Fèvre, A. Le, Leray, S., Lühning, J., Lukasik, J., Lynen, U., Müller, W. F., Pawlowski, P., Piétri, S., Rejmund, F., Schwarz, C., Sfienti, C., Simon, H., Trautmann, W., Volant, C., Yordanov, O., Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
25.40.Sc, 24.10.-i, 25.70.Pq, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

The spallation of $^{56}$Fe in collisions with hydrogen at 1 A GeV has been studied in inverse kinematics with the large-aperture setup SPALADIN at GSI. Coincidences of residues with low-center-of-mass kinetic energy light particles and fragments have been measured allowing the decomposition of the total reaction cross-section into the different possible de-excitation channels. Detailed information on the evolution of these de-excitation channels with excitation energy has also been obtained. The comparison of the data with predictions of several de-excitation models coupled to the INCL4 intra-nuclear cascade model shows that only GEMINI can reasonably account for the bulk of collected results, indicating that in a light system with no compression and little angular momentum, multifragmentation might not be necessary to explain the data., Comment: 4 pages, 5 figures, revised version accepted in Phys. Rev. Lett

Published
2008
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26. Production of medium-mass neutron-rich nuclei in reactions induced by $^{136}$Xe projectiles at 1 A GeV on a beryllium target

Author

Benlliure, J., Fernandez-Ordonez, M., Audouin, L., Boudard, A., Casarejos, E., Ducret, J. E., Enqvist, T., Heinz, A., Henzlova, D., Henzl, V., Kelic, A., Leray, S., Napolitani, P., Pereira, J., Rejmund, F., Ricciardi, M. V., Schmidt, K. -H., Schmitt, C., Stephan, C., Tassan-Got, L., Volant, C., Villagrasa, C., Yordanov, O., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Production cross sections of medium-mass neutron-rich nuclei obtained in the fragmentation of 136Xe projectiles at 1 A GeV have been measured with the FRagment Separator (FRS) at GSI. 125Pd was identified for the first time. The measured cross sections are compared to 238U fission yields and model calculations in order to determine the optimum reaction mechanism to extend the limits of the chart of the nuclides around the r-process waiting point at N=82., 9 pages, 6 figures

Published
2008
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27. New technique to determine beta half-lives in complex-background

Author

Kurtukian Nieto, T., Benlliure, J., Schmidt, K.-H., Audoin, L., Becker, F., Blank, Bertram, Casarejos, E., Cortina-Gil, D., Fernandez-Ordonez, M., Giovinazzo, J., Henzlova, D., Jurado, B., Pereira, J., Rejmund, F., Yordanov, O., Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), USC, Universidad de Santiago de Compostela, Universidad Santiago de Compostela, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universidade de Santiago de Compostela [Spain] (USC ), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

Commune avec ACEN; International audience

Published
2007
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28. Spallation Residues in the Reaction $^{56}$Fe + p at 0.3, 0.5, 0.75, 1.0 and 1.5 A GeV

Author

Villagrasa-Canton, C., Boudard, A., Ducret, J. -E., Fernandez, B., Leray, S., Volant, C., Armbruster, P., Enqvist, T., Hammache, F., Helariutta, K., Jurado, B., Ricciardi, M. -V., Schmidt, K. -H., Summerer, K., Vives, F., Yordanov, O., Audouin, L., Bacri, C. -O., Ferrant, L., Napolitani, P., Rejmund, F., Stephan, C., Tassan-Got, L., Benlliure, J., Casarejos, E., Fernandez-Ordonez, M., Pereira, J., Czajkowski, S., Karamanis, D., Pravikoff, M., George, J. S., Mewaldt, R. A., Yanasak, N., Wiedenbeck, M., Connell, J. J., Faestermann, T., Heinz, A., Junghans, A., Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

The spallation residues produced in the bombardment of 56}Fe at 1.5, 1.0, 0.75, 0.5 and 0.3 A GeV on a liquid-hydrogen target have been measured using the reverse kinematics technique and the Fragment Separator at GSI (Darmstadt). This technique has permitted the full identification in charge and mass of all isotopes produced with cross-sections larger than 10^{-2} mb down to Z=8. Their individual production cross-sections and recoil velocities at the five energies are presented. Production cross-sections are compared to previously existing data and to empirical parametric formulas, often used in cosmic-ray astrophysics. The experimental data are also extensively compared to different combinations of intra-nuclear cascade and de-excitation models. It is shown that the yields of the lightest isotopes cannot be accounted for by standard evaporation models. The GEMINI model, which includes an asymmetric fission decay mode, gives an overall good agreement with the data. These experimental data can be directly used for the estimation of composition modifications and damages in materials containing iron in spallation sources. They are also useful for improving high precision cosmic-ray measurements., Submited to Phys. Rev. C (10/2006)

Published
2007
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29. Spallation residues in the reaction ^(56)Fe + p at 0.3A, 0.5A, 0.75A, 1.0A, and 1.5A GeV

Author

Villagrasa-Canton, C., Boudard, A., Ducret, J.-E., Fernandez, B., Leray, S., Volant, C., Armbruster, P., Enqvist, T., Hammache, F., Helariutta, K., Jurado, B., Ricciardi, M. V., Schmidt, K.-H., Sümmerer, K., Vives, F., Yordanov, O., Audouin, L., Bacri, C.-O., Ferrant, L., Napolitani, P., Rejmund, F., Stephan, C., Tassan-Got, L., Benlliure, J., Casarejos, E., Fernandez-Ordonez, M., Pereira, J., Czajkowski, S., Karamanis, D., Pravikoff, M., George, J. S., Mewaldt, R. A., Yanasak, N., Wiedenbeck, M., Connell, J. J., Faestermann, T., Heinz, A., and Junghans, A.

Subjects
Nuclear Experiment
Abstract

The spallation residues produced in the bombardment of ^(56)Fe at 1.5A, 1.0A, 0.75A, 0.5A, and 0.3A GeV on a liquid-hydrogen target have been measured using the reverse kinematics technique and the fragment separator at GSI (Darmstadt). This technique has permitted the full identification in charge and mass of all isotopes produced with cross sections larger than 10^(-2) mb down to Z=8. Their individual production cross sections and recoil velocities at the five energies are presented. Production cross sections are compared with previously existing data and with empirical parametric formulas, often used in cosmic-ray astrophysics. The experimental data are also extensively compared with the results of different combinations of intranuclear cascade and deexcitation models. It is shown that the yields of the lightest isotopes cannot be accounted for by standard evaporation models. The GEMINI model, which includes an asymmetric fission decay mode, gives an overall good agreement with the data. These experimental data can be directly used for the estimation of composition modifications and damages in materials containing iron in spallation sources. They are also useful for improving high-precision cosmic-ray measurements.

Published
2007

30. Measurement of the complete nuclide production and kinetic energies of the system $^{136}$Xe + hydrogen at 1 GeV per nucleon

Author

Napolitani, P., Schmidt, K. -H., Tassan-Got, L., Armbruster, P., Enqvist, T., Heinz, A., Henzl, V., Henzlova, D., Kelic, A., Pleskac, R., Ricciardi, M. V., Schmitt, C., Yordanov, O., Audouin, L., Bernas, M., Lafriaskh, A., Rejmund, F., Stephan, C., Benlliure, J., Casarejos, E., Ordonez, M. Fernandez, Pereira, J., Boudard, A., Fernandez, B., Leray, S., Villagrasa, C., Volant, C., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

We present an extensive overview of production cross sections and kinetic energies for the complete set of nuclides formed in the spallation of 136Xe by protons at the incident energy of 1 GeV per nucleon. The measurement was performed in inverse kinematics at the FRagment Separator (GSI, Darmstadt). Slightly below the Businaro-Gallone point, 136Xe is the stable nuclide with the largest neutron excess. The kinematic data and cross sections collected in this work for the full nuclide production are a general benchmark for modelling the spallation process in a neutron-rich nuclear system, where fission is characterised by predominantly mass-asymmetric splits., Comment: 18 pages, 14 figures

Published
2007
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31. Residues production in the $^{136}$Xe +p spallation reaction relevant for the incineration of nuclear waste

Author

Paradela, C., Giot, Lydie, Ordonez, M.F., Audouin, L., Benlliure, J., Boudard, A., Casarejos, E., Ducret, J.E., Enqvist, T., Heinz, A., Henzl, V., Henzlova, D., Junghans, A., Jurado, B., Kelic, A., Krasa, A., Kurtukian Nieto, T., Leray, S., Napolitani, P., Pereira, J., Pleskac, R., Rejmund, F., Ricciardi, M.V., Schmitt, C., Stephan, C., Schmidt, K.-H., Tassan-Got, L., Villagrasa, C., Volant, C., Wagner, A., Yordanov, O., Lion, Michel, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Physics::Accelerator Physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

The perspective of incineration of nuclear wastes in subcritical reactors (ADS) have triggered a dedicated long-range research program at GSI in order to reach a full comprehension of the protons and deuterons induced spallation reactions by measurements of evaporation and fission residues with the FRS spectrometer in inverse kinematics. One of the studied systems was 136Xe + p at different energies. Such system behavior remains similar to that of a lead system, found in ADS spallation target, while it can be studied at lower energies reached for the last. In this presentation, we will report on the results obtained on the spallation of 136Xe by protons at 500 A MeV and 200 A MeV, supplying experimental information in an energy range which contributes significantly to the spallation shower in a thick target geometry, and where the intra-nuclear cascade codes present more discrepancies with data. The main challenge of this experiment is related to the lower energy, because of the apparition of different atomic charge states that difficults the mass and charge identification. The measured cross sections of the isotopes produced in the 136Xe + 1H spallation reaction, their evolution with energy and their comparison with different intranuclear-cascade models and evaporation codes will be presented. An interesting feature is the even-odd staggering observed in the production cross sections of the heavy residues for Z=53, 54. This effect was better reproduced with a combination of the INCL4 intra-nuclear cascade and the statistical code ABLA, by introducing structural properties in the statistical decay of prefragments, as already developed in the case of the spallation of 238U + Ti at 1 A GeV

Published
2007

32. Progress in the investigation of nuclei approaching the r-process waiting point A=195

Author

KURTUKIAN NIETO, T., BENLLIURE, J., SCHMIDT, K.-H., AUDOIN, L., BECKER, F., BLANK, Bertram, CASAREJOS, E., CORTINA-GIL, D., FERNANDEZ-ORDONEZ, M., GIOVINAZZO, J., HENZLOVA, D., JURADO, B., PEREIRA, J., REJMUND, F., YORDANOV, O., Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Le Noan, Ludovic

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

Commune avec ACEN; International audience

Published
2006

33. Spallation studies at GSI

Author

GIOT, Lydie, NAPOLITANI, P., F. ORDONEZ, M., HENZLOVA, D., AUDOUIN, L., BENLLIURE, J., BOUDARD, A., CASAJEROS, E., E. DUCRET, J., ENQVIST, T., HEINZ, A., HENZL, V., JUNGHANS, A., JURADO, B., KELIC, A., KRASA, A., KURTUKIAN NIETO, T., LERAY, S., PEREIRA, J., PLESKAC, R., REJMUND, F., V. RICCIARDI, M., SCHMITT, C., STEPHAN, C., SCHMIDT, K.-H., TASSAN-GOT, L., VILLAGRASA, C., VOLANT, C., WAGNER, A., YORDANOV, O., Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Gadioli E., Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics::Instrumentation and Detectors, Physics::Accelerator Physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; An extended experimental and theoretical campaign dedicated to the studies of spallation reactions in inverse kinematics has been performed at GSI, Darmstadt. This research program on spallation reactions is based on an innovative experimental approach, which exploits the unique installations of GSI: the accelerator complex provides heavy-ion beams at relativistic energies, while a high-resolution magnetic spectrometer is used to identify the reaction products in-flight in mass and atomic number and to determine their kinematical properties. In this paper, we report the results obtained in this program on the spallation of 136Xe on protons at 500 A MeV.

Published
2006

34. Production of new neutron-rich nuclei in projectile fragmentation reactions

Author

Benlliure, J., Casarejos, E., Fernandez, M., Kurtukian Nieto, T., Audouin, L., Becker, F., Giovinazzo, J., Henzlova, D., Henzl, V., Jurado, B., Kelic, A., Napolitani, P., Pereira, J., Rejmund, F., Ricciardi, M.V., Schmidt, K.-H., Yordanov, O., G. Cuttone, A. Gadea, M. Lattuada, S. Lunardi, R. Menegazzo, D. Pierroutsakou, C. Signorini, F. Soramel, L. Tecchio, A. Vitturi, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

Communication avec l'équipe de recherche NEX du CENBG; International audience

Published
2006

35. SPALADIN : Coincidence measurements of $^{56}$Fe+p at 1 A.GeV kinetic energy in inverse kinematics

Author

Ducret, J.-É, Piétri, S., Böhmer, M., Lafriakh, A., Le Gentil, E., Aumann, T., Bacri, C.-O., Benlliure, J., Boudard, A., Casajeros, E., Combet, M., Fernandez-Ordonez, M., Gernhaüser, R., Johansson, H., Kelic, A., Kezzar, K., Krücken, R., Kurtukian Nieto, T., Le Fèvre, A., Leray, S., Lukasik, J., Müller, W.F.J., Rejmund, F., Schwarz, C., Sfienti, C., Simon, H., Trautmann, W., Volant, C., Yordanov, O., Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2005

36. Exclusive measurements on $^{56}$Fe+p at 1 A Gev with the SPALADIN setup at GSI

Author

Le Gentil, E., Böhmer, M., Lafriakh, A., Piétri, S., Aumann, T., Bacri, C.-O., Benlliure, J., Boudard, A., Casarejos, E., Combet, M., Ducret, J.-E., Fernandez-Ordoñez, M., Gernhäuser, R., Johansson, H., Keli&#263, A., Kezzar, K., Krücken, R., Kurtukian Nieto, T., Le Fèvre, A., Leray, S., Lukasik, J., Müller, W.F.J., Rejmund, F., Schwarz, C., Sfienti, C., Simon, H., Trautmann, W., Volant, C., Yordanov, O., Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), F. Carsughi, D. Filges, F. Goldenbaum, E. Iverson, T. Nakamura, ALADIN, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics::Instrumentation and Detectors, Inverse kinematics, Fe beam, Physics::Accelerator Physics, Isotopic cross-sections, 25.40.Sc, Heavy residue recoil velocity, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Spallation, Helium production
Abstract

A new type of spallation experiments has been carried out at GSI, Darmstadt (Germany) in order to understand the spallation mechanism in greater details. These experiments use the inverse-kinematics technique where the ion beam is directed onto a liquid Hydrogen target, allowing the detection of heavy spallation residues in coincidence with low center-of-mass energy light particles. The setup is based on A Large Acceptance DIpole magNet (ALADIN) coupled with a multitrack Time Projection Chamber (TPC), a hodoscope and a neutron detector. First, data on $^{56}$Fe+p at 1 A GeV were taken in February 2004. In the on-going analysis, isotopic cross-sections have been determined and compared to data taken at the FRagment Separator in GSI. Mean values and width of residue velocity distributions have also been obtained as well as Helium production cross-section. First, coincidence data are being analyzed.

Published
2005
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37. Isotopically resolved residues frorn the fragmentation of projectiles with largely different N/Z - the isospin-thermometer method

Author

Henzlova, D., Audouin, L., Benlliure, J., Botvina, A., Boudard, A., Casarejos, E., Ducret, J., Enqvist, T., Got, L., Heinz, A., Henzl, V., Junghans, A., Jurado, B., Kelic, A., Krasa, A., Kurtukian, T., Leray, S., Napolitani, P., Ordonez, M., Pereira, J., Pleskac, R., Rejmund, F., Ricciardi, M., Schmidt, K., Schmitt, C., Stephan, C., Villagrasa, C., Volant, C., Wagner, A., and Yordanov, O.

Abstract

The mean N-over-Z (Z) ratio of residues produced in the fragmentation of Xe-136 (N/Z = 1.519), Xe-124 (N/Z = 1.296) in comparison with Fe-56 (N/Z = 1.154) is investigated over the full range of Z. The final residues from the Xe-136 projectile keep a memory on the initial N/Z. The idea to trace back the excitation energy of the fragment entering evaporation via direct exploration of the N/Z evolution in the evaporation process is investigated and applied to the data. The freeze-out temperature is deduced, which is consistent with the investigations of light and intermediate-mass fragments (IMF) in other experiments.

Published
2005

38. Angular Momentum Population in the Projectile Fragmentation of U-238 at 750 MeV/nucleon

Author

Gladnishki, K A, Podolyak, Z, Regan, P H, Gerl, J, Hellstrom, M, Kopatch, Y, Mandal, S, Gorska, M, Page, R D, Wollersheim, H J, Banu, A, Benzoni, G, Boardman, H, La Commara, M, Ekman, J, Fahlander, C, Geissel, H, Grawe, H, Kaza, E, Korgul, A, Matos, M, Mineva, M N, Pearson, C J, Plettner, C, Rudolph, D, Scheidenberger, C, Schmidt, K H, Shishkin, V, Sohler, D, Summerer, K, Valiente-Dobon, J J, Walker, P M, Weick, H, Winkler, M, and Yordanov, O

Subjects
Nuclear Theory, Physics::Atomic and Molecular Clusters, Nuclear Experiment
Abstract

A systematic study of the population probabilities of nanosecond and microsecond isomers produced following the projectile fragmentation of U-238 at 750 MeV/nucleon has been undertaken at the SIS/FRS facility at GSI. Approximately 15 isomeric states in neutron-deficient nuclei around A similar to 190 were identified and the corresponding. isomeric ratios determined. The results are compared with a model based on the statistical abrasion-ablation description of relativistic fragmentation and simple assumptions concerning gamma cascades in the final nucleus (sharp cutoff). This model represents an upper limit for the population of isomeric states in relativistic projectile fragmentation. When the decay properties of the states above the isomer are taken into account, as opposed to the sharp cutoff approximation, a good agreement between the experimental and calculated angular momentum population is obtained.

Published
2004

40. Indications for fast break-up processes in relativistic ion-proton collisions

Author

Napolitani, P., Schmidt, K.-H., Tassan-Got, L., Armbruster, P., Audouin, L., Bacri, C.O., Benlliure, J., Bernas, M., Botvina, A.S., Boudard, A., Casarejos, E., Enqvist, T., Fernandez, B., Fernandez Ordonez, M., Heinz, A., Henzl, V., Henzlova, D., Kelic, A., Lafriakh, A., Leray, S., Rejmund, F., Ricciardi, M.V., Schmitt, C., Stephan, C., Pereira Conca, J., Villagrasa, C., Volant, C., Yordanov, O., Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
ComputingMethodologies_PATTERNRECOGNITION, TheoryofComputation_COMPUTATIONBYABSTRACTDEVICES, TheoryofComputation_GENERAL, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ComputingMethodologies_ARTIFICIALINTELLIGENCE
Abstract

PACS

Published
2003

42. Lifetime study of particle-hole excitations in the semimagig nucleus 93TC

Author

Hausmann, M., Jungclaus, A., Galindo, E., Lieb, K. P., Yordanov, O., Johnstone, I. P., Schwengner, R., Dewald, A., Fitzler, A., Möller, O., Angelis, G., Gadea, A., Martinez, T., Napoli, D. R., and Ur, C.

Subjects
Nuclear Experiment
Abstract

The recoil-distance Doppler-shift technique was employed for determining lifetimes of high-spin states in the semimagic nucleus 93Tc. The nuclei were populated using the reaction 64Zn(35Cl,b1;2p) at a beam energy of 135 MeV, and the g radiation from their decay was detected in the GASP spectrometer. A total of 26 reduced transition probabilities and limits for 19 further transitions were extracted and compared to large scale shell model calculations, considering different configuration spaces and residual interactions. The information deduced about transition strengths turned out to be essential for the correct assignment of the calculated to the experimental excited states.

Published
2003

43. High-spin structure and electromagnetic transition strengths in Cd-104

Author

Muller, G. A., Jungclaus, A., Yordanov, O., Galindo, E., Hausmann, M., Kast, D., Lieb, K. P., Brant, S., Krstic, V., Vretenar, D., Algora, A., Brandolini, F., Angelis, G., Poli, M., Fahlander, C., Andres Gadea, Martinez, T., Napoli, D. R., Dewald, A., Peusquens, R., Tiesler, H., Gorska, M., Grawe, H., and Bizzeti, P. G.

Subjects
Cd-104, PRIRODNE ZNANOSTI. Fizika, high spin states, NATURAL SCIENCES. Physics
Abstract

The recoil distance Doppler shift and Doppler shift attenuation techniques were employed to determine for the first time lifetimes of high spin states in Cd-104in the time range 0.3 ps less than equal to tau less than 1.2 ns. The new experimental results are discussed in the frame of the interacting boson plus broken pair model.

Published
2001
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44. Approximate Scale-Invariant Random Fields: Review and Current Developments.

Author

Konaté, Dialla and Yordanov, O. I.

Abstract

During the last several decades, a great variety of irregular timedependent phenomena and spatial morphologies have been shown to possess stochastic scale-invariance. This led to the development of models based on random fractal processes and, in general, (multi-dimensional) random fractal fields. In contrast to the ideal fractals, commonly assumed to be "scale-free" (reflected for example in the assumption of a simple power-law type correlation functions), the real scale-invariant hierarchies have a finite extend, limited by both a smallest and a largest scales. [ABSTRACT FROM AUTHOR]

Published
2008
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45. Production and Beta Half Lives of Nuclei Close TI the Nucleosynthesis R-Process Path at N=126.

Author

Benlliure, J., Caamaño, M., Casarejos, E., Cortina, D., Kurtukian, T., Ordoñez, M. F., Pereira, J., Becker, F., Henzlova, D., Jurado, B., Schmidt, K. H., Yordanov, O., Audouin, L., and Rejmund, F.

Subjects
FRAGMENTATION reactions, CHEMICAL reactions, NUCLEOSYNTHESIS, CHEMICAL elements, BERYLLIUM, ALKALINE earth metals
Abstract

Cold-fragmentation reactions of 208Pb projectiles impinging a beryllium target at 1 A GeV have been used to produce more than 190 nuclei “south” of lead, 25 of them for the first time. The beta half lives or upper limits of 13 of these new nuclei have been determined using position and time correlations between the nuclei and the betas in an active stopper. The measured half lives can only be described when first forbidden transitions are considered. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2007
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46. Production and Half-lives of Neutron-rich Isotopes Near N=126.

Author

Kurtukian-Nieto, T., Benlliure, J., Schmidt, K.-H., Casarejos, E., Cortina-Gil, D., Fernandez-Ordoñez, M., Pereira, J., Audouin, L., Blank, B., Becker, F., Giovinazzo, J., Henzlova, D., Jurado, B., Rejmund, F., and Yordanov, O.

Subjects
ISOTOPES, STABLE isotopes, NEUTRONS, NUCLEAR shell theory, MIRROR nuclei, NUCLEAR physics, PARTICLES (Nuclear physics)
Abstract

Heavy neutron-rich nuclei close to the neutron closed shell N = 126 were produced by fragmentation of a 1 A GeV 208Pb beam in a beryllium target at the Fragment Separator at GSI. Around 30 heavy neutron-rich isotopes have been synthesized for the first time and the half-lives of some of them have been determined. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2005
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48. Measurement of residual nucleus cross sections and recoil energies in p + Fe collisions at 300, 500, 750, 1000 and 1500 MeV.

Author

Villagrasa, C., Boudard, A., Ducret, J.-E., Fernandez, B., Leray, S., Volant, C., Wlazło, W., Armbruster, P., Enqvist, T., Hammache, F., Helariutta, K., Jurado, B., Ricciardi, M. V., Schmidt, K.-H., Sümmerer, K., Vivès, F., Yordanov, O., Audouin, L., Ferran, L., and Rejmund, F.

Subjects
COLLISIONS (Nuclear physics), NUCLEAR cross sections, SPALLATION (Nuclear physics), NUCLEAR reactions, SCATTERING (Physics), NUCLEAR physics, PHYSICS
Abstract

The production of residual nuclei in p + Fe collisions has been measured at GSI on the FRS facility by means of the reverse kinematic techniques at 300, 500, 750, 1000 and 1500 MeV/A. The cross-sections larger than 0.01 mb of all isotopes with Z larger than 8 have been obtained. Velocity distributions were also measured. Comparisons to models describing spallation reactions and some empirical formulae often used in astrophysics are presented. These data are directly used to calculate impurety production and DPAs in a thin window as foreseen in spallation sources or accelerator-driven systems. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2005
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50. PAIR BREAKING IN A SHEARS BAND OF 104IN.

Author

YORDANOV, O., LIEB, K. P., GALINDO, E., HAUSMANN, M., JUNGCLAUS, A., MÜLLER, G. A., BRANDOLINI, F., ALGORA, A., GADEA, A., NAPOLI, D., and MARTINEZ, T.

Subjects
NUCLEAR physics, NEUTRON-proton interactions, NUCLEAR shell theory, MAGNETIC dipoles, T-matrix
Published
2005

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