Advances Toward and Beyond the Proton Drip line with Recoil-Isomer Tagging

This paper reviews the past, present and future status of recoil-isomer tagging at the University of Jyvaskyla. The main focus of this research has been to access isomeric states at and beyond the mass 140 proton drip line. Recoil-isomer tagging was first used at the University of Jyvaskyla in 1998 to establish the prompt rotational band built upon a K = 8- isomeric state in 138Gd. Since that time a series of experiments have been performed which have studied isomeric states in the N = 77 isotones 63140{expression}Eu77, 65142{expression}Tb77 and 67144{expression}Ho77, and in the N = 74 K-isomer chain, 64138{expression}Gd74 and 66140{expression}Dy74. These experiments have revealed valuable first information about deformations, single-particle excitation energies and hindrance factors in nuclei at and beyond the proton drip line where little or no information previously existed.The results of the most-recent experiments were discussed. These experiments established new isomeric states in 66143{expression}Dy77, 61136{expression}Pm75, and 64137{expression}Gd73 and a further two isomers which are currently unplaced. The paper concludes with a discussion of the future prospects for this research including the increased efficiency of the recoil-isomer tagging technique with a new Multi-Wire Proportional Counter (MWPC) detector which was designed and built at the University of Manchester. The first results from this new setup were shown.