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

B Bucher^{1

2}, X D Tang³, X Fang¹, A Heger^{4

5

6}, S Almaraz-Calderon¹, A Alongi¹, A D Ayangeakaa¹, M Beard¹, A Best¹, J Browne¹, C Cahillane¹, M Couder¹, R J deBoer¹, A Kontos¹, L Lamm¹, Y J Li⁷, A Long¹, W Lu¹, S Lyons¹, M Notani¹, D Patel¹, N Paul¹, M Pignatari^{8

9}, A Roberts¹, D Robertson¹, K Smith¹, E Stech¹, R Talwar¹, W P Tan¹, M Wiescher¹, S E Woosley¹⁰

Affiliations

¹ Institute for Structure and Nuclear Astrophysics, Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46556, USA.
² Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
³ Institute of Modern Physics, Chinese Academy of Science, Lanzhou, Gansu 730000, People's Republic of China.
⁴ Monash Center for Astrophysics, School of Physics and Astronomy, Monash University, Victoria 3800, Australia.
⁵ Department of Physics and Astronomy, Shanghai Jiao-Tong University, CNA, Shanghai 200240, People's Republic of China.
⁶ School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
⁷ China Institute of Atomic Energy, Beijing 102413, People's Republic of China.
⁸ Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Konkoly Thege Miklós út 15-17, H-1121 Budapest, Hungary.
⁹ Department of Physics, University of Basel, Basel CH-4056, Switzerland.
¹⁰ Department of Astronomy and Astrophysics, University of California, Santa Cruz, California 95064, USA.

PMID: 26197115
DOI: 10.1103/PhysRevLett.114.251102

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

B Bucher et al. Phys Rev Lett. 2015.

. 2015 Jun 26;114(25):251102.

doi: 10.1103/PhysRevLett.114.251102. Epub 2015 Jun 25.

Authors

Affiliations

¹ Institute for Structure and Nuclear Astrophysics, Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46556, USA.
² Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
³ Institute of Modern Physics, Chinese Academy of Science, Lanzhou, Gansu 730000, People's Republic of China.
⁴ Monash Center for Astrophysics, School of Physics and Astronomy, Monash University, Victoria 3800, Australia.
⁵ Department of Physics and Astronomy, Shanghai Jiao-Tong University, CNA, Shanghai 200240, People's Republic of China.
⁶ School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
⁷ China Institute of Atomic Energy, Beijing 102413, People's Republic of China.
⁸ Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Konkoly Thege Miklós út 15-17, H-1121 Budapest, Hungary.
⁹ Department of Physics, University of Basel, Basel CH-4056, Switzerland.
¹⁰ Department of Astronomy and Astrophysics, University of California, Santa Cruz, California 95064, USA.

PMID: 26197115
DOI: 10.1103/PhysRevLett.114.251102

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.

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

Affiliations

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

Authors

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Abstract

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