Advances in Tagging Methods for Lifetimes of Isomeric- and Proton-Unbound States.

This paper summarises the programme of Recoil‐isomer tagging that has been performed over the last ten years at the University of Jyväskylä, Finland. The nuclei studied lie in the mass 130–140 region of the Segre chart very close to the proton drip line. The evolution of the isomer character is seen to change from K‐isomers, at N = 74, to shape‐isomers in the gamma soft N = 77 nuclei to seniority‐isomers around N = 82. The influence of the proton drip line on the N = 74 isomers and possible critical‐point symmetries in the N = 77 nuclei are discussed and the latest results presented. Developments of the isomer‐tagging technique, using large beam currents with a dual Multi‐Wire Proportional Counter setup, and an Isomer‐tagged Differential‐Plunger setup are discussed along with a future programme of work at Jyväskylä.

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