Decay of a 19(-) isomeric state in Lu-156

作者：Lewis M C; Parr E; Page R D; McPeake C; Joss D T; Ali F A; Auranen K; Briscoe A D; Capponi L; Grahn T; Greenlees P T; Henderson J; Herzan A; Jakobsson U; Julin R; Juutinen S; Konki J; Labiche M; Leino M; Mason P J R; Nyman M; O'Donnell D; Pakarinen J; Papadakis P; Partanen J; Peura P; Rahkila P; Revill J P; Ruotsalainen P; Sandzelius M; Saren J; Saygi B; Scholey C; Simpson J; Smith J F; Smolen M; Sorri J

来源：PHYSICAL REVIEW C, 2018, 98(2): 024302.

DOI：10.1103/PhysRevC.98.024302

A multiparticle spin-trap isomeric state having a half-life of 179(4) ns and lying 2601 keV above the yrast 10(+) state in Lu-156 has been discovered. The Lu-156 nuclei were produced by bombarding isotopically enriched Cd-106 targets with beams of Ni-58 ions, separated in flight using the gas-filled separator RITU and their decays were measured using the GREAT spectrometer. Analysis of the main decay path that populates yrast states observed previously suggests a spin-parity assignment of 19(-) for the isomeric state, which is consistent with isomeric states identified in the N = 85 isotones. Comparison with other decay paths in Lu-156 indicates that the [pi h(11/)(2)(-1) circle times nu h(9/2)]10(+) state at the bottom of the yrast sequence is likely to be the a-decaying isomeric state, with the [pi h(11/)(2)(-1) circle times nu f(7/2)]9(+) state lying 62 keV above it. The relative ordering of the lowest-lying 9(+) and 10(+) states is inverted in Lu-156 compared with its odd-odd isotones.

• 出版日期2018-8-1