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Resonance neutron-capture cross sections of stable magnesium isotopes and their astrophysical implications
Aerts G., Andriamonje S., Audouin L., Baumann P., Berthoumieux E. et al
Physical Review C 85 (2012) 044615 - http://hal.in2p3.fr/in2p3-00700466
Physique/Physique Nucléaire Expérimentale
Resonance neutron-capture cross sections of stable magnesium isotopes and their astrophysical implications
G. Aerts1, S. Andriamonje1, L. Audouin2, P. Baumann3, E. Berthoumieux1, C. Carrapiço1, S. David2, W. Dridi1, L. Ferrant2, F. Gunsing1, B. Haas4, S. Isaev1, D. Karamanis4, M. Kerveno3, C. Lampoudis1, J. Pancin1, P. Pavlopoulos5, L. Perrot1, A. Plukis1, C. Stephan2, L. Tassan-Got2, C. Massini
1 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
2 :  IPNO - Institut de Physique Nucléaire d'Orsay
CNRS : UMR8608 – IN2P3 – Université Paris XI - Paris Sud
IPN - 15, rue Georges Clemenceau - 91406 ORSAY CEDEX
3 :  DRS-IPHC - Département Recherches Subatomiques
CNRS : UMR7178 – IN2P3 – Université de Strasbourg
23 rue du Loess - BP28 67037 Strasbourg cedex 2
4 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
CNRS : UMR5797 – IN2P3 – Université Sciences et Technologies - Bordeaux I
Chemin du Solarium - BP 120 - 33175 Gradignan Cedex
5 :  Pôle Universitaire Léonard de Vinci
Pôle Universitaire Léonard de Vinci
We have measured the neutron capture cross sections of the stable magnesium isotopes 24,25,26Mg in the energy range of interest to the s process using the neutron time-of-flight facility n_TOF at CERN. Capture events from a natural metal sample and from samples enriched in 25Mg and 26Mg were recorded using the total energy method based on C62H6 detectors. Neutron resonance parameters were extracted by a simultaneous resonance shape analysis of the present capture data and existing transmission data on a natural isotopic sample. Maxwellian-averaged capture cross sections for the three isotopes were calculated up to thermal energies of 100 keV and their impact on s-process analyses was investigated. At 30 keV the new values of the stellar cross section for 24Mg, 25Mg, and 26Mg are 3.8±0.2 mb, 4.1±0.6 mb, and 0.14±0.01 mb, respectively.

Articles dans des revues avec comité de lecture
Physical Review C (Phys. Rev. C)
Publisher American Physical Society
ISSN 0556-2813 (eISSN : 1089-490X)