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

The excited levels of ¹⁷⁹Hf are investigated using the thermal neutron capture γ-ray and conversion electron spectra measured with the bent crystal diffraction spectrometer in Risø 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.