An M3 transition in a doubly odd nucleus of 156 Pm was identified by internal conversion electron measurement through the β-decay of 156 Nd which was separated from the fission products of 235 U using the on-line mass separator KUR-ISOL. The isomeric state at 150.3 keV de-excites to the ground state with the M3 transition, and the spin-parity is considered to be 1 −. Nilsson configurations are also discussed on the basic of the systematics.

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A total absorption detector, which is composed of a through-hole type HPGe detector coupled with a surrounding annular anti-Compton BGO detector, has been developed for β −-decay energy (Q β) measurements of nuclei far off the β-stability line. This detector can measure radiations with an almost 4π solid angle by putting radioactive sources in the middle of the HPGe detector and also can suppress the scattered photons with the anti-Compton BGO scintillation detector. The systematic uncertainty was determined to be 30 keV by measuring 19 nuclei having Q β s between 3 and 8 MeV by means of conventional square root plot analysis. The Q β s of mass-separated fission products 147 La and 148 La were successfully determined to be 5366(40) and 7732(70) keV, respectively.