期刊
PHYSICAL REVIEW LETTERS
卷 117, 期 16, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.162501
关键词
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资金
- RIBF [NP0702-RIBF4R1-01, NP1112-RIBF82, NP1112-RIBF93]
- French-Japanese Laboratoire international associe FJ-NSP
- JSPS KAKENHI Grant [25247045]
- Istanbul University Scientific Project Unit [BYP-53195, YP-54135]
- Max-Planck Partner group
- NSF [PHY-1404442]
- UK Science and Technology Facilities Council (STFC) [ST/F012012/1]
- Japanese Society for the Promotion of Science [26 04808]
- MEXT Japan [15K05104]
- Spanish Ministerio de Economia y Competitividad [FPA2011-24553, FPA2014-52823-C2-1-P]
- Centro de Excelencia Severo Ochoa del [IFIC SEV-2014-0398]
- Junta para la Ampliacion de Estudios Programme (CSIC JAE-Doc) - FSE
- STFC [ST/F012012/1, ST/L005743/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L005743/1, ST/F012012/1] Funding Source: researchfish
- Grants-in-Aid for Scientific Research [15K05104, 15J01446, 25247045, 14F04808] Funding Source: KAKEN
In an experiment with the BigRIPS separator at the RIKEN Nishina Center, we observed two-proton (2p) emission from Kr-67. At the same time, no evidence for 2p emission of Ge-59 and Se-63, two other potential candidates for this exotic radioactivity, could be observed. This observation is in line with Q value predictions which pointed to Kr-67 as being the best new candidate among the three for two-proton radioactivity. Kr-67 is only the fourth 2p ground-state emitter to be observed with a half-life of the order of a few milliseconds. The decay energy was determined to be 1690(17) keV, the 2p emission branching ratio is 37(14)%, and the half-life of Kr-67 is 7.4(30) ms.
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