First direct measurement of 12C (12C,n) 23Mg at stellar energies

Tang, X.D.; Bucher, B.; Fang, X.; Heger, A.; Almaraz-Calderon, S.; Alongi, A.; Ayangeakaa, A.D.; Beard, M.; Best, A.; Browne, J.; Cahillane, C.; Couder, M.; DeBoer, R.J.; Kontos, A.; Lamm, L.; Li, Y.J.; Long, A.; Lu, W.; Lyons, S.; Notani, M.; Patel, D.; Paul, N.; Pignatari, M.; Roberts, A.; Robertson, D.; Smith, K.; Stech, E.; Talwar, R.; Tan, W.P.; Wiescher, M.; Woosley, S.E.

Abstract

© 2016 Owned by the authors, published by EDP Sciences. Neutrons produced by the carbon fusion reaction12C(12C,n)23Mg play an important role in stellar nucleosynthesis. Past studies have shown large discrepancies between experimental data and theory, leading to an uncertain cross section extrapolation at astrophysical energies. We present the first direct measurement which extends deep into the astrophysical energy range along with a new and improved extrapolation technique based on experimental data from the mirror reaction12C(12C,p)23Na. The new reaction rate has been determined with a well-defined uncertainty which exceeds the precision required by astrophysics models. Using our constrained rate, we find that12C(12C,n)23Mg is crucial to the production of Na and Al in Pop-III Pair Instability Supernovae.

Citation

Tang, X., Bucher, B., Fang, X., Heger, A., Almaraz-Calderon, S., Alongi, A., Ayangeakaa, A., Beard, M., Best, A., Browne, J., Cahillane, C., Couder, M., DeBoer, R., Kontos, A., Lamm, L., Li, Y., Long, A., Lu, W., Lyons, S., Notani, M., …Woosley, S. (2016). First direct measurement of 12C (12C,n) 23Mg at stellar energies. EPJ Web of Conferences, 109, 04009. https://doi.org/10.1051/epjconf/201610904009

• Journal Article Type: Article
• Acceptance Date: Jan 1, 2016
• Online Publication Date: Feb 12, 2016
• Publication Date: Feb 12, 2016
• Deposit Date: Jul 16, 2018
• Publicly Available Date: Jul 16, 2018
• Journal: EPJ Web of Conferences
• Print ISSN: 2100-014X
• Publisher: EDP Sciences
• Peer Reviewed: Peer Reviewed
• Volume: 109
• Article Number: 04009
• Pages: 04009
• DOI: https://doi.org/10.1051/epjconf/201610904009
• Public URL: https://hull-repository.worktribe.com/output/901939
• Publisher URL: https://www.epj-conferences.org/articles/epjconf/abs/2016/04/epjconf_omeg2016_04009/epjconf_omeg2016_04009.html
• Contract Date: Jul 16, 2018