The 1- (1.9 MeV) 2+ transition in decay of 148Pm

O. A. ROSSO; L. SZYBISZ

Z. PHYS. - A - HADRON. NUCL.

Springer-Verlag

Lugar: ; Año: 1983 vol. 311 p. 119 - 126

0939-7922

The non-unique first-forbidden 1- (1.9 MeV â-) 2+ transition in the decay of 148Pm is studied. The nuclear matrix elements are evaluated using for the ground state of the odd-odd 148Pm a phenomenological wave function derived in a previous work in the framework of the two-quasiparticle model and assuming that the first excited 2+ state in 148Sm can be described as the first quadrupole phonon state. This model provides nuclear matrix elements which are capable of describing experimental data like the spectrum shape factor, the longitudinal polarization of the electrons and a particular set of the â-ã directional correlations coefficients, but it fails to interpret the large log ft value of this transition. In addition, the validity of the î-approximation is discussed.