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Ground-State Proton Decay of 69Br and Implications for the 68Se Astrophysical Rapid Proton-Capture Process Waiting Point

Abstract : We report on the first direct measurement of the proton separation energy for the proton-unbound nucleus 69Br. Bypassing the 68Se waiting point in the rp process is directly related to the 2p-capture rate through 69Br, which depends exponentially on the proton separation energy. We find a proton separation energy for 69Br of Sp(69Br)=-785-40+34  keV; this is less bound compared to previous predictions which have relied on uncertain theoretical calculations. The influence of the extracted proton separation energy on the rp process occurring in type I x-ray bursts is examined within the context of a one-zone burst model.
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http://hal.in2p3.fr/in2p3-00606207
Contributor : Sandrine Guesnon <>
Submitted on : Tuesday, September 6, 2011 - 10:56:56 AM
Last modification on : Tuesday, February 19, 2019 - 9:56:01 AM

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A.M. Rogers, M.A. Famiano, W.G. Lynch, M.S. Wallace, F. Amorini, et al.. Ground-State Proton Decay of 69Br and Implications for the 68Se Astrophysical Rapid Proton-Capture Process Waiting Point. Physical Review Letters, American Physical Society, 2011, 106, pp.252503. ⟨10.1103/PhysRevLett.106.252503⟩. ⟨in2p3-00606207⟩

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