Ground-State Proton Decay of Br69 and Implications for the Se68 Astrophysical Rapid Proton-Capture Process Waiting Point

Details Ground-State Proton Decay of Br69 and Implications for the Se68 Astrophysical Rapid Proton-Capture Process Waiting Point Ground-State Proton Decay of Br69 and Implications for the Se68 Astrophysical Rapid Proton-Capture Process Waiting Point

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011phrvl.106y2503r&link_type=abstract

Physical Review Letters, vol. 106, Issue 25, id. 252503

Physics

2

Binding Energies And Masses, Decay By Proton Emission, Explosive Burning In Accreting Binary Systems, 59<=A<=89

Scientific paper

We report on the first direct measurement of the proton separation energy for the proton-unbound nucleus Br69. Bypassing the Se68 waiting point in the rp process is directly related to the 2p-capture rate through Br69, which depends exponentially on the proton separation energy. We find a proton separation energy for Br69 of Sp(Br69)=-785-40+34keV; 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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