Nuclear structure of ¹⁸¹Hf studied in (n, γ) and (d, p) reactions

The level structure in ¹⁸¹Hf is studied by using (n, γ) and (d, p) reactions. Gamma-gamma coincidences permit an unambiguous placement of the majority of gamma transitions in the level scheme up to 1.8 MeV, while the (d, p) angular distributions and vector analyzing powers are used to deduce spin-parity assignments. Forty-three levels are grouped into 12 rotational bands built on one-quasiparticle and quasiparticle-plus-vibrational states. The proposed level structures are in qualitative agreement with earlier quasiparticle-phonon-model calculations.