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

Abstract : 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.
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Journal articles
Physical Review C, American Physical Society, 2012, 85, pp.044615. <10.1103/PhysRevC.85.044615>


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Submitted on : Wednesday, May 23, 2012 - 11:00:07 AM
Last modification on : Monday, October 13, 2014 - 3:00:43 PM

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G. Aerts, S. Andriamonje, L. Audouin, P. Baumann, E. Berthoumieux, et al.. Resonance neutron-capture cross sections of stable magnesium isotopes and their astrophysical implications. Physical Review C, American Physical Society, 2012, 85, pp.044615. <10.1103/PhysRevC.85.044615>. <in2p3-00700466>

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