Level structures in 147Pm from 147Nd decay

The γ and conversion electron spectra following the β decay of 147Nd are measured using the HPGe detector and the miniorange electron spectrometer. The 147Pm level scheme comprising of 11 levels up to 686 keV excitation, interconnected by 29 transitions, is presented. The 649 keV (11) /(2) - level, with six interconnecting (including two E3) transitions, is observed for the first time in decay studies. K-shell conversion coefficients for four transitions and L-shell conversion coefficients for five transitions are being reported for the first time. The Iπ= (7) /(2) + spin-parity assignment for the 680 keV level is confirmed. Specific structure features of the 147Pm level scheme, depicting the unique coexistence of spherical shell model configurations, particle-phonon coupled multiplets, evolution of octupole collectivity, and well-developed rotational bands, are discussed; certain open questions about the spectroscopy and interpretation of the 633 and the 641 keV levels are highlighted. copyright 1997 The American Physical Society