Resonance neutron-capture cross sections of stable magnesium isotopes and their astrophysical implications

C. Massimi , P. Koehler , S. Bisterzo , N. Colonna , R. Gallino , F. Gunsing (1) , F. Käppeler , G. Lorusso , A. Mengoni , M. Pignatari , G. Vannini , U. Abbondanno , G. Aerts (1) , H. Alvarez , F. Alvarez-Velarde , S. Andriamonje (1) , J. Andrzejewski , P. Assimakopoulos , L. Audouin (2) , G. Badurek , M. Barbagallo , P. Baumann (3) , F. Becvar , F. Belloni , M. Bennett , E. Berthoumieux (1) , M. Calviani , F. Calvino , D. Cano-Ott , R. Capote , C. Carrapiço , A. Carrillo de Albornoz , P. Cennini , V. Chepel , E. Chiaveri , G. Cortes , A. Couture , J. Cox , M. Dahlfors , S. David (2) , I. Dillmann , R. Dolfini , C. Domingo-Pardo , W. Dridi (1) , I. Duran , C. Eleftheriadis , M. Embid-Segura , L. Ferrant (2) , Anthony Ferrari , R. Ferreira-Marques , L. Fitzpatrick , H. Frais-Koelbl , K. Fujii , W. Furman , I. Goncalves , E. Gonzalez-Romero , A. Goverdovski , F. Gramegna , E. Griesmayer , C. Guerrero , B. Haas (4) , R. Haight , M. Heil , A. Herrera-Martinez , F. Herwig (5) , R. Hirschi , M. Igashira , S. Isaev (2) , E. Jericha , Y. Kadi , D. Karadimos , D. Karamanis (6) , M. Kerveno (3) , V. Ketlerov , V. Konovalov , S. Kopecky , E. Kossionides , M. Krticka , C. Lampoudis (1) , H. Leeb , C. Lederer , A. Lindote , I. Lopes , R. Losito , M. Lozano , S. Lukic (3) , J. Marganiec , L. Marques , S. Marrone , T. Martinez , P. Mastinu , E. Mendoza , P. M. Milazzo , C. Moreau , M. Mosconi , F. Neves , H. Oberhummer , S. O'Brien , M. Oshima , J. Pancin (1) , C. Papachristodoulou , C. Papadopoulos , C. Paradela , N. Patronis , A. Pavlik , P. Pavlopoulos , L. Perrot (1) , M. T. Pigni , R. Plag , A. Plompen , A. Plukis (1) , A. Poch , J. Praena , C. Pretel , J. Quesada , T. Rauscher , G. Rockefeller , M. Rosetti , C. Rubbia , G. Rudolf (3) , J. Salgado , C. Santos , L. Sarchiapone , I. Savvidis , G. Tagliente , J. L. Tain , D. Tarrio , L. Tavora , R. Terlizzi , P. Vaz , A. Ventura , D. Villamarin , V. Vlachoudis , R. Vlastou , F. Voss , S. Walter , H. Wendler , M. Wiescher , K. Wisshak , L. Tassan-Got (2) , C. Stephan (2)

1 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
2 IPNO - Institut de Physique Nucléaire d'Orsay
3 DRS-IPHC - Département Recherches Subatomiques
4 CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
5 LANL - Theorical Division
6 ACEN - Aval du cycle et Energie Nucléaire

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 C6 2H6 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.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

C. Massimi, P. Koehler, S. Bisterzo, N. Colonna, R. Gallino, et al.. Resonance neutron-capture cross sections of stable magnesium isotopes and their astrophysical implications. Physical Review C, 2012, 85, pp.044615. ⟨10.1103/PhysRevC.85.044615⟩. ⟨in2p3-00700563⟩