Stellar neutron capture cross sections of ²⁰ ²¹ ²²Ne

Heil, M.; Plag, R.; Uberseder, E.; Gallino, R.; Bisterzo, S.; Juseviciute, A.; Käppeler, F.; Lederer, C.; Mengoni, A.; Pignatari, M.

Abstract

The stellar (n,γ) cross sections of the Ne isotopes are important for a number of astrophysical quests, i.e., for the interpretation of abundance patterns in presolar material or with respect to the s-process neutron balance in red giant stars. This paper presents resonance studies of experimental data in the keV range, which had not been fully analyzed before. The analyses were carried out with the R-matrix code sammy. With these results for the resonant part and by adding the components due to direct radiative capture, improved Maxwellian-averaged cross sections (MACS) could be determined. At kT=30keV thermal energy we obtain MACS values of 240±29,1263±160, and 53.2±2.7 μbarn for ²⁰Ne,²¹Ne, and ²²Ne, respectively. In earlier work the stellar rates of ²⁰Ne and ²¹Ne had been grossly overestimated. ²²Ne and ²⁰Ne are significant neutron poisons for the s process in stars because their very small MACS values are compensated by their large abundances.

Citation

Heil, M., Plag, R., Uberseder, E., Gallino, R., Bisterzo, S., Juseviciute, A., Käppeler, F., Lederer, C., Mengoni, A., & Pignatari, M. (2014). Stellar neutron capture cross sections of ²⁰ ²¹ ²²Ne. Physical Review C, 90(4), 045804-1-045804-11. https://doi.org/10.1103/PhysRevC.90.045804

• Journal Article Type: Article
• Acceptance Date: Sep 10, 2014
• Online Publication Date: Oct 24, 2014
• Publication Date: Oct 24, 2014
• Deposit Date: Apr 18, 2016
• Publicly Available Date: Apr 18, 2016
• Journal: Physical review c
• Print ISSN: 2469-9985
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 90
• Issue: 4
• Article Number: ARTN 045804
• Pages: 045804-1-045804-11
• DOI: https://doi.org/10.1103/PhysRevC.90.045804
• Keywords: Nuclear and High Energy Physics
• Public URL: https://hull-repository.worktribe.com/output/436253
• Publisher URL: http://journals.aps.org/prc/abstract/10.1103/PhysRevC.90.045804
• Additional Information: This is an authors accepted manuscript version of an article published in Physical review c, 2014, v.90 issue 4.
• Contract Date: Apr 18, 2016