Stellar (n,γ) cross sections of ²³Na

Uberseder, E.; Heil, M.; Käppeler, F.; Lederer, C.; Mengoni, A.; Bisterzo, S.; Pignatari, M.; Wiescher, M.

Abstract

The cross section of the ²³Na(n,γ)²⁴Na reaction has been measured via the activation method at the Karlsruhe 3.7 MV Van de Graaff accelerator. NaCl samples were exposed to quasistellar neutron spectra at kT = 5.1 and 25 keV produced via the ¹⁸O(p,n)¹⁸F and ⁷Li(p,n)⁷Be reactions, respectively. The derived capture cross sections (σ)kT=5keV = 9.1 ± 0.3mb and (σ)kT=25keV = 2.03 ± 0.05 mb are significantly lower than reported in literature. These results were used to substantially revise the radiative width of the first ²³Na resonance and to establish an improved set of Maxwellian average cross sections. The implications of the lower capture cross section for current models of s-process nucleosynthesis are discussed.

Citation

Uberseder, E., Heil, M., Käppeler, F., Lederer, C., Mengoni, A., Bisterzo, S., Pignatari, M., & Wiescher, M. (2017). Stellar (n,γ) cross sections of ²³Na. Physical Review C, 95(2), 025803. https://doi.org/10.1103/PhysRevC.95.025803

• Journal Article Type: Article
• Acceptance Date: Jan 16, 2017
• Online Publication Date: Feb 2, 2017
• Publication Date: Feb 2, 2017
• Deposit Date: Feb 21, 2017
• Publicly Available Date: Feb 21, 2017
• Journal: Physical review c
• Print ISSN: 2469-9985
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 95
• Issue: 2
• Article Number: ARTN 025803
• Pages: 025803
• DOI: https://doi.org/10.1103/PhysRevC.95.025803
• Keywords: Neutron activation; Stellar (n,γ) cross section; s process
• Public URL: https://hull-repository.worktribe.com/output/448687
• Publisher URL: https://journals.aps.org/prc/abstract/10.1103/PhysRevC.95.025803
• Additional Information: This is the author's accepted manuscript of an article published in Physical review c, 2017, v.95 issue 2.
• Contract Date: Feb 21, 2017