Abstract
Neutron-rich 160,161,162Sm isotopes have been populated at the RIBF, RIKEN via β first time. β-coincident γ rays were observed in all three isotopes including γ rays from the isomeric decay of 160Sm and 162Sm. The isomers in 160Sm and 162Sm have previously been observed but have been populated via β decay for the first time. The isomeric state in 162Sm is assigned a configuration based on the decay pattern. The level schemes of 160Sm and 162Sm are presented. The ground states in the parent nuclei 160Pm and 162Pm are both assigned a configuration based on the population of states in the daughter nuclei. Blocked BCS calculations were performed to further investigate the spin-parities of the ground states in 160Pm, 161Pm, and 162Pm, and the isomeric state in 162Sm
Highlights
Neutron-rich 160,161,162Pm isotopes were produced by inflight fission of a 345 A·MeV 238U beam with an average beam intensity of 10 particle-nA incident on a 9Be target at the RIBF
The γ rays emitted following β decay were detected using EURICA (Euroball-RIKEN Cluster Array) [14,15,16]: 84 HPGe crystals arranged in a 4π configuration at ∼ 22 cm from ion and β implantation
Four Pm isotopes were populated in this experiment, the number of implanted 163Pm ions is much lower than the A = 160-162 nuclei and no γ rays were observed following the decay of this nucleus
Summary
Neutron-rich 160,161,162Pm isotopes were produced by inflight fission of a 345 A·MeV 238U beam with an average beam intensity of 10 particle-nA incident on a 9Be target at the RIBF. The ions were implanted into an active stopper, WAS3ABi: Wide Angle Silicon-Strip-Stopper Array for Beta and ion detection [13]. This consisted of 5 DSSDs, each with 60 x 40 1-mm strips. A time window of 1 second was used to correlate an ion implantation with a βdecay particle detected in the same or neighbouring pixel. The γ rays emitted following β decay were detected using EURICA (Euroball-RIKEN Cluster Array) [14,15,16]: 84 HPGe crystals arranged in a 4π configuration at ∼ 22 cm from ion and β implantation
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