Measurement of the 77Se(n, γ) cross section up to 200 keV at the n_TOF facility at CERN
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AuthorTOF Collaboration; Porras Sánchez, José Ignacio; Praena Rodríguez, Antonio Javier; Torres Sánchez, Pablo
American Physical Society
Sosnin, N. V., Lederer-Woods, C., Krtička, M., Garg, R., Dietz, M., Bacak, M., ... & n_TOF Collaboration. (2023). Measurement of the Se 77 (n, γ) cross section up to 200 keV at the n_TOF facility at CERN. Physical Review C, 107(6), 065805.[DOI: 10.1103/PhysRevC.107.065805]
SponsorshipUK Science and Facilities Council (ST/M006085/1); MSMT of the Czech Republic; The Charles University UNCE/SCI/013 project; European Research Council ERC-2015-StG No. 677497
The 77 Se ( n , γ ) reaction is of importance for 77 Se abundance during the slow neutron capture process in massive stars. We have performed a new measurement of the 77 Se 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 k T = 5 keV and k T = 100 keV , with uncertainties between 4.2% and 5.7%. Our results lead to substantial decreases of 14% and 19% in 77 Se abundances produced through the slow neutron capture process in selected stellar models of 15 M ⊙ and 2 M ⊙ , respectively, compared to using previous recommendation of the cross section.