New portal to the O-15(alpha, gamma)Ne-19 resonance triggering CNO-cycle breakout

Wrede C.; Glassman B. E.; Perez-Loureiro D.Allen J. M.Bardayan D. W.Bennett M. B.Brown B. A.Chipps K. A.Febbraro M.Fry C.Hall M. R.Hall O.Liddick S. N.OMalley P.Ong W. -J.Pain S. D.Schwartz S. B.Shidling P.Sims H.Thompson P.Zhang H.

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New portal to the O-15(alpha, gamma)Ne-19 resonance triggering CNO-cycle breakout

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The O-15(alpha,gamma)Ne-19 reaction is expected to trigger the initial path for breakout from the CNO hydrogen-burning cycles to the rapid proton capture (rp) process in type I x-ray bursts on accreting neutron stars. The thermonuclear reaction rate has a major impact on models of type I x-ray burst observables and it depends on the small a-particle branching ratio, Gamma(alpha)/Gamma, of the 4.03 MeV state in Ne-19. Attempts to measure Gamma(alpha)/Gamma by populating the 4.03 MeV state using nuclear reactions have only led to strong upper limits. In the present work, we report the first experimental evidence that the 4.03 MeV Ne-19 state is populated in Mg-20 beta-delayed proton emission. This new channel has the potential to provide the necessary sensitivity to detect a finite value of Gamma(alpha)/Gamma.

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《Physical review, C》 |2017年第3期|共6页
作者
Wrede C.; Glassman B. E.; Perez-Loureiro D.Allen J. M.Bardayan D. W.Bennett M. B.Brown B. A.Chipps K. A.Febbraro M.Fry C.Hall M. R.Hall O.Liddick S. N.OMalley P.Ong W. -J.Pain S. D.Schwartz S. B.Shidling P.Sims H.Thompson P.Zhang H.;
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Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA;

Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA;

Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USAOak Ridge Natl Lab, Oak Ridge, TN 37831 USATexas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USAUniv Surrey, Guildford GU2 7XH, Surrey, England;

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正文语种英语
中图分类原子核物理学、高能物理学;
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New portal to the O-15(alpha, gamma)Ne-19 resonance triggering CNO-cycle breakout

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