Measurement of the Ce(n, ) cross section at n_TOF and its astrophysical implications for the chemical evolution of the universe

Amaducci, S.*; 原田 秀郎   ; 木村 敦   ; 他130名*

Amaducci, S.*; Harada, Hideo; Kimura, Atsushi; 130 of others*

Ce(n,) is a key reaction for slow neutron-capture (-process) nucleosynthesis due to being a bottleneck in the reaction flow. For this reason, it was measured with high accuracy (uncertainty 5%) at the n_TOF facility, with an unprecedented combination of a high purity sample and low neutron-sensitivity detectors. The measured Maxwellian averaged cross section is up to 40% higher than previously accepted values. Stellar model calculations indicate a reduction around 20% of the s-process contribution to the Galactic cerium abundance and smaller sizeable differences for most of the heavier elements. No variations are found in the nucleosynthesis from massive stars.