Ground-state proton decay of 69Br and implications for the rp-process 68Se waiting-point
A M Rogers, W G Lynch, M A Famiano, M S Wallace, F Amorini, D Bazin, R, J Charity, F Delaunay, R T de Souza, J Elson, A Gade, D Galaviz, S Hudan, J, Lee, S Lobostov, S Lukyanov, M Matos, M Mocko, M B Tsang, D Shapira, L G, Sobotka, and G Verde
TL;DR
This paper reports the first direct measurement of the proton separation energy for 69Br, exploring its impact on the rp-process in X-ray bursts and how it can bypass the 68Se waiting-point.
Contribution
It provides the first direct measurement of Sp for 69Br and analyzes its implications for astrophysical rp-process models.
Findings
Proton separation energy for 69Br measured directly.
Sp significantly influences 2p-capture rates in rp-process.
Results suggest potential pathways bypassing the 68Se waiting-point.
Abstract
The first direct measurement of the proton separation energy, Sp, for the proton-unbound nucleus 69Br is reported. Of interest is the exponential dependence of the 2p-capture rate on Sp which can bypass the 68Se waiting-point in the astrophysical rp process. An analysis of the observed proton decay spectrum is given in terms of the 69Se mirror nucleus and the influence of Sp is explored within the context of a single-zone X-ray burst model.
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Taxonomy
TopicsNuclear physics research studies · Neutrino Physics Research · Nuclear Physics and Applications