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Direct Mass Measurements of Short-Lived A=2Z-1 Nuclides Ge-63, As-65, Se-67, and Kr-71 and Their Impact on Nucleosynthesis in the rp Process

Abstract : Mass excesses of short-lived A ¼ 2Z 1 nuclei 63Ge, 65As, 67Se, and 71Kr have been directly measured to be 46 921ð37Þ, 46 937ð85Þ, 46 580ð67Þ, and 46 320ð141Þ keV, respectively. The deduced proton separation energy of 90ð85Þ keV for 65As shows that this nucleus is only slightly proton unbound. X-ray burst model calculations with the new mass excess of 65As suggest that the majority of the reaction flow passes through 64Ge via proton capture, indicating that 64Ge is not a significant rp-process waiting point.
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http://hal.in2p3.fr/in2p3-00586035
Contributor : Christine Hadrossek <>
Submitted on : Thursday, April 14, 2011 - 3:20:58 PM
Last modification on : Wednesday, September 16, 2020 - 4:17:45 PM

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X.L. Tu, H.S. Xu, M. Wang, Y. H. Zhang, Yu.A. Litvinov, et al.. Direct Mass Measurements of Short-Lived A=2Z-1 Nuclides Ge-63, As-65, Se-67, and Kr-71 and Their Impact on Nucleosynthesis in the rp Process. Physical Review Letters, American Physical Society, 2011, 106, pp.112501. ⟨10.1103/PhysRevLett.106.112501⟩. ⟨in2p3-00586035⟩

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