Two-Proton Radioactivity of ^{67}Kr.

T Goigoux,P Ascher,B Blank,M Gerbaux,J Giovinazzo,S Grévy,T Kurtukian Nieto, C Magron,P Doornenbal,G G Kiss,S Nishimura,P-A Söderström,V H Phong,J Wu,D S Ahn,N Fukuda,N Inabe,T Kubo,S Kubono,H Sakurai,Y Shimizu,T Sumikama,H Suzuki,H Takeda, J Agramunt, A Algora,V Guadilla, A Montaner-Piza,A I Morales,S E A Orrigo, B Rubio,Y Fujita,M Tanaka, W Gelletly, P Aguilera,F Molina, F Diel, D Lubos,G de Angelis, D Napoli,C Borcea, A Boso, R B Cakirli, E Ganioglu,J Chiba,D Nishimura,H Oikawa,Y Takei,S Yagi,K Wimmer,G de France,S Go,B A Brown

Physical review letters（2016）

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摘要

In an experiment with the BigRIPS separator at the RIKEN Nishina Center, we observed two-proton (2p) emission from ^{67}Kr. At the same time, no evidence for 2p emission of ^{59}Ge and ^{63}Se, two other potential candidates for this exotic radioactivity, could be observed. This observation is in line with Q value predictions which pointed to ^{67}Kr as being the best new candidate among the three for two-proton radioactivity. ^{67}Kr 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 ^{67}Kr is 7.4(30) ms.

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