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First Direct Measurement of (12)C((12)C,n)(23)Mg at Stellar Energies

Bucher, B. and Tang, X. D. and Fang, X. and Heger, A. and Almaraz-Calderon, S. and Alongi, A. and Ayangeakaa, A. D. and Beard, M. and Best, A. and Browne, J. and Cahillane, C. and Couder, M. and deBoer, R. J. and Kontos, A. and Lamm, L. and Li, Y. J. and Long, A. and Lu, W. and Lyons, S. and Notani, M. and Patel, D. and Paul, N. and Pignatari, M. and Roberts, A. and Robertson, D. and Smith, K. and Stech, E. and Talwar, R. and Tan, W. P. and Wiescher, M. and Woosley, S. E.. (2015) First Direct Measurement of (12)C((12)C,n)(23)Mg at Stellar Energies. Physical review letters, 114 (25). p. 251102.

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Official URL: http://edoc.unibas.ch/41656/

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Abstract

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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Pignatari, Marco
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
ISSN:1079-7114
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:30 Jun 2016 11:02
Deposited On:19 May 2016 09:12

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