High-spin isomers and high-spin isomer beams

Abstract Yrast traps were found in N=83 isotones, 144 Pm and 145 Sm, by using inverse kinematic reactions, 14 N( 136 Xe, 6n) 144 Pm and 16 O( 136 Xe, 7n) 145 Sm. Their probable spin-parities are (27 + ) and ( 49 2 + ), respectively. Excitation energies of these isomers are 7.5 and 8.7 MeV Reaction products were transported by a gas filled recoil ion separation system and collected at 6 m down stream of the primary target position . The possible utilization of these high-spin isomers as secondary beams are discussed.