Electromagnetic Property of Low-Lying Levels in ^<143>Pm

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Low-lying excited states in a neutron magic nucleus ^<143>Pm, were studied by investigating γ-rays and conversion electrons following ^<141>Pr(α,2n)^<143>Pm and ^<148>Nd(p,6n)^<143>Pm reactions. The 272 keV 7/2^+, 960 keV 11/2^- and 1057 keV 3/2^+ levels were confirmed and the 1664 keV (13/2^-) and possibly 2053 keV levels were found. The γ-transition scheme for these levels were obtained. The half-life of the 960 keV state was measured as 26.0±2.0 ns. The following reduced transition probabilities were obtained; B(M2,960 keV 11/2^-⇾272 keV 7/2^+)=10.5±0.8fm^2 (eℏ/2Mc)^2, and B(E3,960 keV 11/2^-⇾ground state 5/2^+)=(1.01±0.09)×10^4e^2fm^6. The effective M2 and E3 coupling constants are g^<eff>_<M2>=0.235g^<SP>_<M2> and g^<SP>_<E3>. These values suggest a reduction of the M2 transition due to a destructive effect of the spin-isospin core polarization and an enhancement of the E3 transition due to a constructive effect of the octupole core polarization.
社団法人日本物理学会の論文
1973-09-05