Beta Decay of ^<153>Nd and Reflection Asymmetric Deformation in ^<153>Pm

概要

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The level strtncture of Pm has been studied from the decay of "'Nd. The radioactivities153of "'Nd were separated from the fission products of "'U using the trpgraded KUR-ISOL. Aprecise decay scheme of "'Nd has been constrtrcted up to 2 lVIeV and 115 'y-rays and 36 levelswere involved in the decay schenae, in which 107 'y-rays and 28 levels were newly observed. Themultipolarities and E2 / M 1 mixing ratios of 1 1 'y-transitions were deduced frorn the meastnrementof internal conversion electrons, From the results of the angtular correlation measurements, thespin values of 450.5, 105.4 and 32.3 keV levels were dedtrced to be 3 /2", 7/2" and 5 /2", respectively and the previous assignments were confirtaaed. The half-lives of 32.3 and 105.4 keV levelswere determined to be 1.2(l) ns and 0.44(2) us, respectively and the enhanced El transitionswith B(El) = 10 ' x 10 ' W.u. were observed. The "'Pun level structure was compared withthe result of a calculation with a rotation-vibration coupling model (RVCllvI) and it was foundthat "'Pm has a typical nuclear structure of the def'orrned nucleus. lVIoreover, the observation ofenhanced El transitions between parity doublet bands indicates the possibility of the existenceof the reflection asymmetric deformation in "'Prn.
社団法人日本物理学会の論文
1996-12-15