Direct mass measurements of short-lived A=2Z-1 nuclides (63)Ge, (65)As, (67)Se, and (71)Kr and their impact on nucleosynthesis in the rp process期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Direct mass measurements of short-lived A=2Z-1 nuclides (63)Ge, (65)As, (67)Se, and (71)Kr and their impact on nucleosynthesis in the rp process

Authors:	Tu X L Xu H S Wang M Zhang Y H Litvinov Yu A Sun Y Schatz H Zhou X H Yuan Y J Xia J W Audi G Blaum K Du C M Geng P Hu Z G Huang W X Jin S L Liu L X Liu Y Ma X Mao R S Mei B Shuai P Sun Z Y Suzuki H Tang S W Wang J S Wang S T Xiao G Q Xu X Yamaguchi T Yamaguchi Y Yan X L Yang J C Ye R P Zang Y D Zhao H W Zhao T C Zhang X Y Zhan W L

Affiliation:	Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China.

Abstract:	Mass excesses of short-lived A=2Z-1 nuclei (63)Ge, (65)As, (67)Se, and (71)Kr have been directly measured to be -46,921(37), -46,937(85), -46,580(67), and -46,320(141) keV, respectively. The deduced proton separation energy of -90(85) keV for (65)As shows that this nucleus is only slightly proton unbound. X-ray burst model calculations with the new mass excess of (65)As suggest that the majority of the reaction flow passes through (64)Ge via proton capture, indicating that (64)Ge is not a significant rp-process waiting point.

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