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First results of the $$^{140}$$Ce(n,$$gamma$$)$$^{141}$$Ce cross-section measurement at n_TOF

Amaducci, S.*; 原田 秀郎   ; 木村 敦   ; 他127名*

Amaducci, S.*; Harada, Hideo; Kimura, Atsushi; 127 of others*

An accurate measurement of the $$^{140}$$Ce(n,$$gamma$$) energy-dependent cross-section was performed at the n_TOF facility at CERN. This cross-section is of great importance because it represents a bottleneck for the s-process nucleosynthesis and determines to a large extent the cerium abundance in stars. For this measurement, we used a sample of cerium oxide enriched in $$^{140}$$Ce to 99.4%. The experimental apparatus consisted of four deuterated benzene liquid scintillator detectors, which allowed us to overcome the difficulties present in the previous measurements, thanks to their very low neutron sensitivity. The accurate analysis of the p-wave resonances and the calculation of their average parameters are fundamental to improve the evaluation of the $$^{140}$$Ce Maxwellian-averaged cross-section.

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パーセンタイル:32.63

分野:Astronomy & Astrophysics

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