First Direct Measurement ofC12(C12,n)Mg23at Stellar Energies

Autor:	Manoel Couder, Sergio Almaraz-Calderon, Wanpeng Tan, R. Talwar, A. D. Ayangeakaa, Edward Stech, S. E. Woosley, N. Paul, M. Notani, Michael Wiescher, B. Bucher, Yangkai Li, Alexander Heger, A. Long, D. Patel, Wenting Lu, Xiao Fang, Marco Pignatari, C. Cahillane, A. Best, Amy Roberts, J. Browne, Donald Robertson, Stephanie Lyons, Karl Smith, A. Alongi, Richard deBoer, A. Kontos, Mary Beard, X. Tang, Larry Lamm
Rok vydání:	2015
Předmět:	Physics Nuclear physics Reaction rate Supernova Stellar nucleosynthesis 13. Climate action Extrapolation Nuclear astrophysics General Physics and Astronomy Nuclear fusion Neutron 7. Clean energy Instability
Zdroj:	Physical Review Letters. 114
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.114.251102
Popis:	Neutrons produced by the carbon fusion reaction (12)C((12)C,n)(23)Mg play an important role in stellar nucleosynthesis. However, 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 that extends deep into the astrophysical energy range along with a new and improved extrapolation technique based on experimental data from the mirror reaction (12)C((12)C,p)(23)Na. The new reaction rate has been determined with a well-defined uncertainty that exceeds the precision required by astrophysics models. Using our constrained rate, we find that (12)C((12)C,n)(23)Mg is crucial to the production of Na and Al in pop-III pair instability supernovae. It also plays a nonnegligible role in the production of weak s-process elements, as well as in the production of the important galactic γ-ray emitter (60)Fe.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::91a66fe74259eb3f0434ac47a292a3f9 https://doi.org/10.1103/physrevlett.114.251102