New half-life measurements of the most neutron-rich arsenic and germanium isotopes

C. Mazzocchi, K. P. Rykaczewski, A. Korgul, R. Grzywacz, P. Ba̧czyk, C. Bingham, N. T. Brewer, C. J. Gross, C. Jost, M. Karny, M. Madurga, A. J. Mendez, K. Miernik, D. Miller, S. Padgett, S. V. Paulauskas, D. W. Stracener, M. Wolińska-Cichocka, I. N. Borzov

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Abstract

The β-decay properties of several neutron-rich germanium and arsenic isotopes were measured at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. The measurements of almost-pure radioactive sources were enabled by the combination of ion-source chemistry and two-stage mass separation. The half-life of 86Ge (226±21 ms) was determined for the first time, while those of 84,85Ge and 84-87As were remeasured. The results are compared to theoretical predictions of the gross theory of β decay, the finite-range droplet model, and the new calculations using the energy density functional DF3a with continuum quasiparticle random-phase approximation (CQRPA). We confirm the robustness and good predictive power of the latter model for nuclei near closed shells. These DF3a+CQRPA calculations were used recently to analyze r-process isobaric abundances.

Original languageEnglish
Article number034315
JournalPhysical Review C - Nuclear Physics
Volume87
Issue number3
DOIs
StatePublished - Mar 13 2013

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