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Title: 20 {mu}s isomeric state in doubly odd {sub 61}{sup 134}Pm

Recoil-isomer tagging at the Accelerator Laboratory of the University of Jyvaeskylae has been used to establish the isomeric nature of a known (7{sup -}) excited state in the doubly odd nucleus {sup 134}Pm. The isomeric state was determined to have a half-life of 20(1) {mu}s and was populated from the decay of a {pi}h{sub 11/2} x {nu}h{sub 11/2} band using the {sup 92}Mo({sup 54}Fe,2{alpha}3pn) reaction at 305 and 315 MeV. The isomer decays by a 71-keV transition that provides an intermediate step in linking the established {sup 134}Pm high-spin level scheme to the lower-spin states observed from the {beta} decay of {sup 134}Sm. Electron-conversion analysis for the 71-keV {gamma}-ray transition reveals that it is of E1 character and its small reduced-transition probability suggests that {sup 134}Pm may have a nuclear shape more rigid than that of the neighboring nuclei.
Authors:
; ; ; ;  [1] ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [2]
  1. Schuster Laboratory, University of Manchester, Manchester M13 9PL (United Kingdom)
  2. Department of Physics, University of Jyvaeskylae, Jyvaeskylae FIN-40014 (Finland) (and others)
Publication Date:
OSTI Identifier:
21290043
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 80; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevC.80.024303; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ACCELERATORS; BETA DECAY; ELECTRONS; EXCITED STATES; GAMMA RADIATION; HALF-LIFE; IRON 54; ISOMERS; MEV RANGE 100-1000; MOLYBDENUM 92 TARGET; PROMETHIUM 134; RECOILS; SAMARIUM 134; SPIN