Possible triaxial superdeformation in 174Hf

Four regularly spaced rotational bands with large dynamical moments of inertia, which are consistent with known superdeformed bands in the Lu/Hf region, have been identified in 174Hf. The states were populated in the 130Te(48Ca,4n) reaction at a beam energy of 194 MeV. The Gammasphere array detected the emitted gamma radiation. Ultimate cranker calculations predict substantial triaxial deformation (γ ≈ ±17°) for highly deformed 174Hf structures. However, 174Hf is eight neutrons away from the previously established N = 94 triaxial superdeformed shell gap. Shell gaps at N = 100 and 106 with γ ⩾ 15° are observed when ε2 ≈ 0.45, which may be responsible for the predicted TSD minima in 174Hf.

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