Two-Proton Radioactivity of Kr-67

GOIGOUX, T.; Ascher, P.; Blank, B.; Gerbaux, M.; Giovinazzo, J.; Grevy, S.; NIETO, T.; MAGRON, C.; DOORNENBAL, P.; KISS, G.; NISHIMURA, S.; SOEDERSTROEM, P.; PHONG, V.; WU, J.; AHN, D.; FUKUDA, N.; INABE, 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.; ORRIGO, S.; Rubio, B.; Fujita, Y.; Tanaka, M.; Gelletly, W.; AGUILERA, P.; Molina, F.; DIEL, F.; LUBOS, D.; de Angelis, G.; NAPOLI, D.; BORCEA, C.; BOSO, A.; Cakirli, Rabia; Ganioglu, Ela; CHIBA, J.; Nishimura, D.; OIKAWA, H.; TAKEI, Y.; YAGI, S.; WIMMER, K.; de France, G.; GO, S.; Brown, B.

doi:10.1103/physrevlett.117.162501

Two-Proton Radioactivity of Kr-67

GOIGOUX T., Ascher P., Blank B., Gerbaux M., Giovinazzo J., Grevy S., ...More

PHYSICAL REVIEW LETTERS, vol.117, no.16, 2016 (SCI-Expanded)

Publication Type: Article / Article
Volume: 117 Issue: 16
Publication Date: 2016
Doi Number: 10.1103/physrevlett.117.162501
Journal Name: PHYSICAL REVIEW LETTERS
Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Istanbul University Affiliated: Yes

Abstract

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.