Resonance neutron-capture cross sections of stable magnesium isotopes and their astrophysical implications
Author
Massimi, C.
Koehler, P.
Bisterzo, S.
Colonna, N.
Gallino, R.
Gunsing, F.
Kaeppeler, F.
Lorusso, G.
Mengoni, A.
Pignatari, M.
Vannini, G.
Abbondanno, U.
Aerts, G.
Alvarez, H.
Alvarez-Velarde, F.
Andriamonje, S.
Andrzejewski, J.
Assimakopoulos, P.
Audouin, L.
Badurek, G.
Barbagallo, M.
Baumann, P.
Becvar, F.
Belloni, F.
Bennett, M.
Berthoumieux, E.
Calviani, M.
Calvino, F.
Cano-Ott, D.
Capote, R.
Carrapico, C.
Carrillo de Albornoz, A.
Cennini, P.
Chepel, V.
Chiaveri, E.
Cortes, G.
Couture, A.
Cox, J.
Dahlfors, M.
David, S.
Dillmann, I.
Dolfini, R.
Domingo-Pardo, C.
Dridi, W.
Duran, I.
Eleftheriadis, C.
Embid-Segura, M.
Ferrant, L.
Ferrari, A.
Rauscher, T.
N TOF Collaboration
Attention
2299/10789
Abstract
We have measured the neutron capture cross sections of the stable magnesium isotopes Mg-24,Mg-25,Mg-26 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 Mg-25 and Mg-26 were recorded using the total energy method based on (C6H6)-H-2 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 Mg-24, Mg-25, and Mg-26 are 3.8 +/- 0.2 mb, 4.1 +/- 0.6 mb, and 0.14 +/- 0.01 mb, respectively.