IDENTIFICATION OF MU-S-ISOMERS PRODUCED IN THE FRAGMENTATION OF A SN-112 BEAM

Decays of over forty short-lived (T-1/2 from approximate to 50 ns to 70 mu s) isomeric states including a new isomer As-66m produced in the fragmentation of a Sn-112 beam (58 A . MeV, 63 A . MeV) on a Ni-nat target were observed at the final focus of the LISE3 spectrometer at GANIL. Their detection, based on the slow (approximate to 10 mu s) time correlation of identified ions with the characteristic gamma-radiation, represents a novel method to search for new isomers and can be used for unambiguous isotope identification for projectile fragment separator experiments. Isomeric yields and isomer-to-total production ratios were determined.