Measurement of the ⁷⁸Se (n,γ) ⁷⁹Se cross section up to 600 keV at the n_TOF facility at CERN

Author(s)

, N. V. Sosnin, C. Lederer-Woods, R. Garg, U. Battino, S. Cristallo, M. Dietz, S. Heinitz, M. Krtička, R. Reifarth, S. Valenta, D. Vescovi, O. Aberle, V. Alcayne, S. Amaducci, J. Andrzejewski, L. Audouin, V. Bécares, V. Babiano-Suarez, M. Bacak, M. Barbagallo, F. Bečvář, G. Bellia, E. Berthoumieux, J. Billowes, D. Bosnar, A. Brown, M. Busso, M. Caamaño, L. Caballero, F. Calviño, M. Calviani, D. Cano-Ott, A. Casanovas, F. Cerutti, Y. H. Chen, E. Chiaveri, N. Colonna, G. Cortés, M. A. Cortés-Giraldo, L. Cosentino, L. A. Damone, M. Diakaki, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, H. Leeb, A. Pavlik, A. Wallner, T. Wright

Abstract

The Se78(n,γ)Se79 cross section has a high impact on the abundances of Se78 produced during the slow neutron capture process (s process) in massive stars. A measurement of the Se78 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 Se78 abundances produced in the s process in massive stars and AGB stars. Massive stars are now predicted to produce subsolar Se78/Se76 ratios, which is expected since Se76 is an s-only isotope, while solar Se78 abundances have also contributions from other nucleosynthesis processes.

Organisation(s)

Isotope Physics

External organisation(s)

University of Edinburgh, University of Hull, INAF-Osservatorio Astrofisico di Torino, Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, Physikalisch-Technische Bundesanstalt, Paul Scherrer Institute, Charles University Prague, Johann Wolfgang Goethe-Universität Frankfurt am Main, European Organization for Nuclear Research (CERN), Centro de Investigaciones Energeticas Medioambientales y Tecnológica, INFN Laboratori Nazionali del Sud, Università degli Studi di Catania, University of Lodz, IPHC, Universitat de València, Technische Universität Wien, Université Paris Saclay, Istituto Nazionale di Fisica Nucleare (INFN), Roma, University of Manchester, University of Zagreb, University of York, Università degli Studi di Perugia, Universidade de Santiago de Compostela (USC), Universitat Politècnica de Catalunya, Universidad de Sevilla, Università degli Studi di Bari Aldo Moro, National Technical University of Athens (NTUA), Australian National University

Journal

Physical Review C

Volume

110

No. of pages

12

ISSN

2469-9985

DOI

https://doi.org/10.1103/PhysRevC.110.065805

Publication date

12-2024

Peer reviewed

Yes

Austrian Fields of Science 2012

103014 Nuclear physics, 103004 Astrophysics

ASJC Scopus subject areas

Nuclear and High Energy Physics

Portal url

https://ucrisportal.univie.ac.at/en/publications/c7f0b80c-9b0d-49bd-a4ad-4988e91f3168