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

被引：28

作者：

Bucher, B. ^{[1
,2
]}

Tang, X. D. ^{[3
]}

Fang, X. ^{[1
]}

Heger, A. ^{[4
,5
,6
]}

Almaraz-Calderon, S. ^{[1
]}

Alongi, A. ^{[1
]}

Ayangeakaa, A. D. ^{[1
]}

Beard, M. ^{[1
]}

Best, A. ^{[1
]}

Browne, J. ^{[1
]}

Cahillane, C. ^{[1
]}

Couder, M. ^{[1
]}

deBoer, R. J. ^{[1
]}

Kontos, A. ^{[1
]}

Lamm, L. ^{[1
]}

Li, Y. J. ^{[7
]}

Long, A. ^{[1
]}

Lu, W. ^{[1
]}

Lyons, S. ^{[1
]}

Notani, M. ^{[1
]}

Patel, D. ^{[1
]}

Paul, N. ^{[1
]}

Pignatari, M. ^{[8
,9
]}

Roberts, A. ^{[1
]}

Robertson, D. ^{[1
]}

Smith, K. ^{[1
]}

Stech, E. ^{[1
]}

Talwar, R. ^{[1
]}

Tan, W. P. ^{[1
]}

Wiescher, M. ^{[1
]}

Woosley, S. E. ^{[10
]}

机构：

[1] Univ Notre Dame, Joint Inst Nucl Astrophys, Inst Struct & Nucl Astrophys, Notre Dame, IN 46556 USA

[2] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[3] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China

[4] Monash Univ, Sch Phys & Astron, Monash Ctr Astrophys, Clayton, Vic 3800, Australia

[5] Shanghai Jiao Tong Univ, CNA, Dept Phys & Astron, Shanghai 200240, Peoples R China

[6] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

[7] China Inst Atom Energy, Beijing 102413, Peoples R China

[8] Hungarian Acad Sci, Res Ctr Astron & Earth Sci, Konkoly Observ, H-1121 Budapest, Hungary

[9] Univ Basel, Dept Phys, CH-4056 Basel, Switzerland

[10] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 25期

基金：

美国国家科学基金会; 澳大利亚研究理事会; 中国国家自然科学基金;

关键词：

MASSIVE STARS; S-PROCESS; C-12+C-12 REACTION; NUCLEOSYNTHESIS; C-12; SIGNATURE; EVOLUTION; NUCLEAR; IMPACT; YIELDS;

D O I：

10.1103/PhysRevLett.114.251102

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Neutrons produced by the carbon fusion reaction C-12(C-12, n)Mg-23 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 C-12(C-12, p)Na-23. 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 C-12(C-12, n)Mg-23 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 gamma-ray emitter Fe-60.

引用

页数：6

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