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

作者：Mazzocchi C^*; Rykaczewski K P; Korgul A; Grzywacz R; Baczyk P; Bingham C; Brewer N T; Gross C J; Jost C; Karny M; Madurga M; Mendez A J II; Miernik K; Miller D; Padgett S; Paulauskas S V; Stracener D W; Wolinska Cichocka M; Borzov I N

来源：Physical Review C, 2013, 87(3): 034315.

DOI：10.1103/PhysRevC.87.034315

The beta-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 Ge-86 (226 +/- 21 ms) was determined for the first time, while those of Ge-84,Ge-85 and As84-87 were remeasured. The results are compared to theoretical predictions of the gross theory of beta 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. DOI: 10.1103/PhysRevC.87.034315

• 出版日期2013-3-13