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Examination of the role of the O-14(alpha, p)F-17 reaction rate in type-I x-ray bursts

Title
Examination of the role of the O-14(alpha, p)F-17 reaction rate in type-I x-ray bursts
Authors
Hu, J.He, J. J.Parikh, A.Xu, S. W.Yamaguchi, H.Kahl, D.Ma, P.Su, J.Wang, H. W.Nakao, T.Wakabayashi, Y.Teranishi, T.Hahn, K. I.Moon, J. Y.Jung, H. S.Hashimoto, T.Chen, A. A.Irvine, D.Lee, C. S.Kubono, S.
Ewha Authors
한인식
SCOPUS Author ID
한인식scopus
Issue Date
2014
Journal Title
PHYSICAL REVIEW C
ISSN
0556-2813JCR Link1089-490XJCR Link
Citation
vol. 90, no. 2
Publisher
AMER PHYSICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
The O-14(alpha, p)F-17 reaction is one of the key reactions involved in the breakout from the hot-CNO cycle to the rp-process in type-I x-ray bursts (XRBs). The resonant properties in the compound nucleus Ne-18 have been investigated through resonant elastic scattering of F-17 + p. The radioactive F-17 beam was separated by the Center for Nuclear Study radioactive ion beam separator (CRIB) and bombarded a thick H-2 gas target at 3.6 MeV/nucleon. The recoiling light particles were measured by three Delta E-E silicon telescopes at laboratory angles of theta(lab) approximate to 3 degrees, 10 degrees, and 18 degrees. Five resonances at E-x = 6.15, 6.28, 6.35, 6.85, and 7.05 MeV were observed in the excitation functions, and their spin-parities have been determined based on an R-matrix analysis. In particular, J(pi) = 1(-) was firmly assigned to the 6.15-MeV state which dominates the thermonuclear O-14(alpha, p)F-17 rate below 2 GK. As well, a possible new excited state in Ne-18 was observed at E-x = 6.85 +/- 0.11 MeV with tentative J = 0 assignment. This state could be the analog state of the 6.880 MeV (0(-)) level in the mirror nucleus O-18, or a bandhead state (0(+)) of the six-particle four-hole (6p-4h) band. A new thermonuclear O-14(alpha, p)F-17 rate has been determined, and the astrophysical impact of multiple recent rates has been examined using an XRB model. Contrary to previous expectations, we find only a modest impact on predicted nuclear energy generation rates from using reaction rates differing by up to several orders of magnitude.
DOI
10.1103/PhysRevC.90.025803
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사범대학 > 과학교육과 > Journal papers
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