Investigation of the low-lying levels of 179Hf with the (n, γ) and (n, e) reactions

Abstract The excited levels of 179 Hf are investigated using the thermal neutron capture γ-ray and conversion electron spectra measured with the bent crystal diffraction spectrometer in Riso and the β-spectrograph in Riga. The level scheme contains the odd parity rotational bands 7 2 − [514], 1 2 − [510], 5 2 − [512], 1 2 − [521], 3 2 − [512] and 7 2 − [503] . The energies of these levels and the intensity ratios of the transitions between them are calculated taking into account the rotation-particle coupling (RPC). The following even parity levels are proposed: 859.0 and 942.2 keV ( 7 2 + and 9 2 + of the 7 2 + [633] band ) ; 1004.1 and 1079.2 keV ( 5 2 + and 7 2 + of the 9 2 + [624] + Q(22) band ) ; 1186.0, 1199.2 and 1296.4 keV ( 1 2 + , 5 2 + and 3 2 + of the 1 2 + [651] band ) . The levels at 1249.8, 1269.7, 1432.9, 1482.2 and 1755.5 keV, supported by the analysis of the γγ coincidence spectrum and Ge(Li) singles data, are discussed.