Abstract
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±0.8 fm 2 (\(e\hbar/2\) Mc) 2 , and B(E3, 960 keV 11/2 - →ground state 5/2 + )=(1.01±0.09)×10 4 e 2 fm 6 . The effective M2 and E3 coupling constants are g M2 eff =0.235 g M2 SP and g M3 eff =4.0 g E3 SP . 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.
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