Half-lives of Sr 73 and y 76 and the consequences for the proton dripline

L. Sinclair, R. Wadsworth, J. Dobaczewski, A. Pastore, G. Lorusso, H. Suzuki, D. S. Ahn, H. Baba, F. Browne, P. J. Davies, P. Doornenbal, A. Estrade, Y. Fang, N. Fukuda, J. Henderson, T. Isobe, D. G. Jenkins, S. Kubono, Z. Li, D. LubosS. Nishimura, I. Nishizuka, Z. Patel, S. Rice, H. Sakurai, Y. Shimizu, P. Schury, H. Takeda, P. A. Söderström, T. Sumikama, H. Watanabe, V. Werner, J. Wu, Z. Y. Xu

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The half-lives of seven nuclei have been determined in the neutron-deficient mass-70 region following their production via fragmentation of a 345 MeV/nucleon Xe124 primary beam on a 740 mg/cm2 Be9 target at the RI Beam Factory, RIKEN. The results include two new (Sr73 and Y76) half-lives and a more precise measurement for the ground-state half-life of Sr74. The new results are discussed with reference to previously published calculations that predict the location of the proton dripline in the light Sr and Y region of the nuclear chart. In addition, differences in the ground-state structure of Rb72 and Y76 are discussed with the aid of density functional theory calculations. These provide a possible explanation for why Rb72 undergoes proton decay while the α-conjugate nucleus Y76 predominantly undergoes β+ decay.

Original languageEnglish
Article number044311
JournalPhysical Review C
Issue number4
StatePublished - Oct 16 2019


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