Resonance neutron-capture cross sections of stable magnesium isotopes and their astrophysical implications
2012
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.
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