The 77Se(n, \& gamma;) reaction is of importance for 77Se abundanceduring the slow neutron capture process in massive stars. We haveperformed a new measurement of the 77Se radiative neutron capture crosssection at the Neutron Time-of-Flight facility at CERN. Resonancecapture kernels were derived up to 51 keV and cross sections up to 200keV. Maxwellian-averaged cross sections were calculated for stellartemperatures between kT = 5 keV and kT = 100 keV, with uncertaintiesbetween 4.2\% and 5.7\%. Our results lead to substantial decreases of14\% and 19\% in 77Se abundances produced through the slow neutroncapture process in selected stellar models of 15M0 and 2M0,respectively, compared to using previous recommendation of the crosssection.
Measurement of the 77Se(n, γ) cross section up to 200 keV at the n\_TOF facility at CERN
Musumarra A.;
2023-01-01
Abstract
The 77Se(n, \& gamma;) reaction is of importance for 77Se abundanceduring the slow neutron capture process in massive stars. We haveperformed a new measurement of the 77Se radiative neutron capture crosssection at the Neutron Time-of-Flight facility at CERN. Resonancecapture kernels were derived up to 51 keV and cross sections up to 200keV. Maxwellian-averaged cross sections were calculated for stellartemperatures between kT = 5 keV and kT = 100 keV, with uncertaintiesbetween 4.2\% and 5.7\%. Our results lead to substantial decreases of14\% and 19\% in 77Se abundances produced through the slow neutroncapture process in selected stellar models of 15M0 and 2M0,respectively, compared to using previous recommendation of the crosssection.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
