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Measurement of the Se78 (n , γ) Se79 cross section up to 600 keV at the n_TOF facility at CERN

n_TOF Collaboration; Sosnin, N. V. ; Lederer-Woods, C.; Garg, R.; Battino, U.; Cristallo, S.; Dietz, M.; Heinitz, S.; Krtička, M.; Reifarth, R.; Valenta, S.; Vescovi, D.; Aberle, O.; Alcayne, V.; Amaducci, S.; Andrzejewski, J.; Audouin, L.; Bécares, V.; Babiano-Suarez, V.; ... mehr

Abstract:

The 78Se(n, γ ) 79Se cross section has a high impact on the abundances of 78Se produced during the slow
neutron capture process (s process) in massive stars. A measurement of the 78Se radiative neutron capture cross
section has been performed at the Neutron Time-of-Flight facility at CERN using a set of liquid scintillation
detectors that have been optimized for a low sensitivity to neutrons. We present resonance capture kernels up
to 70 keV and cross section from 70 to 600 keV. Maxwellian-averaged cross section (MACS) values were
calculated for stellar temperatures between kT = 5 and 100 keV, with uncertainties between 4.6% and 5.8%.
The new MACS values result in substantial decreases of 20–30% of 78Se abundances produced in the s process
in massive stars and AGB stars. Massive stars are now predicted to produce subsolar78Se / 76Se ratios, which
is expected since 76Se is an s-only isotope, while solar 78Se abundances have also contributions from other
nucleosynthesis processes.

Zugehörige Institution(en) am KIT Zukunftscampus (CAMPUS)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2024
Sprache Englisch
Identifikator ISSN: 2469-9985, 1538-4497, 0556-2813, 1089-490X, 2469-9993, 2470-0002
KITopen-ID: 1000178496
Erschienen in Physical Review C
Verlag American Physical Society (APS)
Band 110
Heft 6
Seiten Art.-Nr.: 065805
Vorab online veröffentlicht am 17.12.2024
Nachgewiesen in Dimensions
Web of Science
Scopus

Verlagsausgabe §
DOI: 10.5445/IR/1000178496
Veröffentlicht am 11.02.2025
Seitenaufrufe: 11
seit 31.01.2025
Downloads: 2
seit 15.02.2025
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