Two-Proton Radioactivity of Kr-67
Date
2016Author
INABE, N.
Fujita, Y.
Tanaka, M.
Gelletly, W.
AGUILERA, P.
Molina, F.
DIEL, F.
LUBOS, D.
de Angelis, G.
NAPOLI, D.
BORCEA, C.
Ascher, P.
Blank, B.
Gerbaux, M.
Giovinazzo, J.
CHIBA, J.
Nishimura, D.
OIKAWA, H.
TAKEI, Y.
YAGI, S.
WIMMER, K.
de France, G.
GO, S.
Brown, B. A.
Ganioglu, Ela
Cakirli, R. B.
GOIGOUX, T.
BOSO, A.
Grevy, S.
NIETO, T. Kurtukian
MAGRON, C.
DOORNENBAL, P.
KISS, G. G.
NISHIMURA, S.
SOEDERSTROEM, P. -A.
PHONG, V. H.
WU, J.
AHN, D. S.
FUKUDA, N.
KUBO, T.
KUBONO, S.
SAKURAI, H.
Shimizu, Y.
SUMIKAMA, T.
SUZUKI, H.
TAKEDA, H.
Agramunt, J.
Algora, A.
GUADILLA, V.
MONTANER-PIZA, A.
MORALES, A. I.
ORRIGO, S. E. A.
Rubio, B.
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Show full item recordAbstract
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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