The 77Se(n, & gamma;) reaction is of importance for 77Se abundance during the slow neutron capture process in massive stars. We have performed a new measurement of the 77Se radiative neutron capture cross section at the Neutron Time-of-Flight facility at CERN. Resonance capture kernels were derived up to 51 keV and cross sections up to 200 keV. Maxwellian-averaged cross sections were calculated for stellar temperatures between kT = 5 keV and kT = 100 keV, with uncertainties between 4.2% and 5.7%. Our results lead to substantial decreases of 14% and 19% in 77Se abundances produced through the slow neutron capture process in selected stellar models of 15M0 and 2M0, respectively, compared to using previous recommendation of the cross section.
Sosnin, N.V., Lederer-Woods, C., Krtička, M., Garg, R., Dietz, M., Bacak, M., et al. (2023). Measurement of the Se77(n,γ) cross section up to 200 keV at the n_TOF facility at CERN. PHYSICAL REVIEW C, 107(6), 1-9 [10.1103/physrevc.107.065805].
Measurement of the Se77(n,γ) cross section up to 200 keV at the n_TOF facility at CERN
Mingrone, F.;Manna, A.;Massimi, C.Writing – Review & Editing
;Vannini, G.;
2023
Abstract
The 77Se(n, & gamma;) reaction is of importance for 77Se abundance during the slow neutron capture process in massive stars. We have performed a new measurement of the 77Se radiative neutron capture cross section at the Neutron Time-of-Flight facility at CERN. Resonance capture kernels were derived up to 51 keV and cross sections up to 200 keV. Maxwellian-averaged cross sections were calculated for stellar temperatures between kT = 5 keV and kT = 100 keV, with uncertainties between 4.2% and 5.7%. Our results lead to substantial decreases of 14% and 19% in 77Se abundances produced through the slow neutron capture process in selected stellar models of 15M0 and 2M0, respectively, compared to using previous recommendation of the cross section.File | Dimensione | Formato | |
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