Measurement of the 70Ge(n, γ) cross section up to 300 keV at the CERN n_TOF facility

Scientific paper - Original scientific paper

• Author: A. Gawlik
• Author: ...
• Author: Damir Bosnar; MBZ: 134936
• Author: ...
• Author: Petar Žugec; MBZ: 326085
• Collaboration: n_TOF Collaboration
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

Neutron capture data on intermediate mass nuclei are of key importance to nucleosynthesis in the weak component of the slow neutron capture processes, which occurs in massive stars. The (n, γ) cross section on 70Ge, which is mainly produced in the s process, was measured at the neutron time-of-flight facility n_TOF at CERN. Resonance capture kernels were determined up to 40 keV neutron energy and average cross sections up to 300 keV. Stellar cross sections were calculated from kT = 5 keV to kT = 100 keV and are in very good agreement with a previous measurement by Walter and Beer (1985) and recent evaluations. Average cross sections are in agreement with Walter and Beer (1985) over most of the neutron energy range covered, while they are systematically smaller for neutron energies above 150 keV. We have calculated isotopic abundances produced in s-process environments in a 25 solar mass star for two initial metallicities (below solar and close to solar). While the low metallicity model reproduces best the solar system germanium isotopic abundances, the close to solar model shows a good global match to solar system abundances in the range of mass numbers A = 60–80.

• Keywords (english): 70Ge; neutron capture cross section; n_TOF
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review C
• Numbering: vol. 100, no. 4, 045804
• p-ISSN: 2469-9985
• e-ISSN: 2469-9993
• DOI: https://doi.org/10.1103/PhysRevC.100.045804
• URN:NBN: urn:nbn:hr:217:858285
• Publication: 2019
• Project: Number: IP-2018-01-8570; Title (croatian): Elektroni, kaoni i neutroni u preciznim mjerenjima svojstava hadrona i jezgara; Acronym: EKNpEXP; Leader: Damir Bosnar; Jurisdiction: Croatia; Funding stream: IP
• Document URL: https://link.aps.org/doi/10.1103/PhysRevC.100.045804
• Type of resource: Text
• Access conditions: Open access
• Public note: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Received 1 April 2019; published 17 October 2019.
• Created on: 2020-08-21 16:22:13