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

Bucher, B.; Tang, X. D.; Fang, X.; Heger, A.; Alamaraz-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.


B. Bucher

X. D. Tang

X. Fang

A. Heger

S. Alamaraz-Calderon

A. Alongi

A. D. Ayangeakaa

M. Beard

A. Best

J. Browne

C. Cahillane

M. Couder

R. J. deBoer

A. Kontos

L. Lamm

Y. J. Li

A. Long

W. Lu

S. Lyons

M. Notani

D. Patel

N. Paul

M. Pignatari

A. Roberts

D. Robertson

K. Smith

E. Stech

R. Talwar

W. P. Tan

M. Wiescher

S. E. Woosley


Neutrons produced by the carbon fusion reaction ¹²C(¹²C,n)²³Mg 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 ¹²C(¹²C,p)²³Na. 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 ¹²C(¹²C,n)²³Mg is crucial to the production of Na and Al in Pop-III Pair Instability Supernovae. It also plays a non-negligible role in the production of weak s-process elements as well as in the production of the important galactic


Bucher, B., Tang, X. D., Fang, X., Heger, A., Alamaraz-Calderon, S., Alongi, A., …Woosley, S. E. (2015). The first direct measurement of ¹²C (¹²C,n) ²³Mg at stellar energies. Physical review letters, 114(25), 251102.

Journal Article Type Article
Acceptance Date Mar 20, 2015
Online Publication Date Jun 25, 2015
Publication Date Jun 25, 2015
Deposit Date Nov 12, 2015
Publicly Available Date Nov 23, 2017
Journal Physical review letters
Print ISSN 0031-9007
Electronic ISSN 1079-7114
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 114
Issue 25
Article Number ARTN 251102
Pages 251102
Keywords Stellar energies
Public URL
Publisher URL
Additional Information This is the Author Accepted Manuscript of an article published in Physical review letters, 2015, v.114.


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Copyright Statement
©2015 American Physical Society

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