STUDY OF HIGH-SPIN ISOMER AND ITS DECAY LEVEL SCHEME OF DOUBLY ODD PM-144 NUCLEUS

The high spin isomer (HSI) in Pm-144 was produced and separated by usi ng the high spin isomer beam facility. Based on the measurements of ga mma-gamma coincidence, gamma-ray excitation functions, and isotropies, the decay level scheme of the HSI was established for the first time including 19 new high spin levels and 29 new gamma-transitions assigne d to Pm-144 by this work. The HSI-gamma correlation measurement indica ted that the half-life of the HSI is longer than 2 mu s. From the syst ematic comparisons and the deformed independent particle model calcula tions for the N = 83 isotopes, the most possible particle configuratio n of pi(1h(11/2)(2)d(5/2))nu(1i(13/2)1h(9/2)2f(7/2)) and the spin-pari ty of J(x) = 27(+) were assigned to this HSI corresponding to an oblat e deformation with beta = -0.18.