Phys.Rev. C 99, 024316 (2019)

J.Wiederhold, V.Werner, R.Kern, N.Pietralla, D.Bucurescu, R.Carroll, N.Cooper, T.Daniel, D.Filipescu, N.Florea, R-B.Gerst, D.Ghita, L.Gurgi, J.Jolie, R.S.Ilieva, R.Lica, N.Marginean, R.Marginean, C.Mihai, I.O.Mitu, F.Naqvi, C.Nita, M.Rudigier, S.Stegemann, S.Pascu, P.H.Regan

Evolution of E2 strength in the rare-earth isotopes ^{174, 176, 178, 180}Hf

NUCLEAR REACTIONS ¹⁸⁰Hf(¹⁶O, ¹⁶O), E=55 MeV; measured Eγ, Iγ, γγ-coin, half-lives of first 2+, 4+ and 6+ states by fast-timing γγ-coin using the ROSPHERE detector array for γ detection at the Bucharest FN Tandem accelerator. ¹⁸⁰Hf; deduced levels, B(E2) values and B(E2) ratios. Comparison with literature values.

RADIOACTIVITY ^174,176,178Ta(EC), (β⁺)[from ¹⁷¹Yb(⁶Li, 3n), ^172,173Yb(⁷Li, 3n), E=30 MeV]; measured Eγ, Iγ, γγ-coin, half-lives of first 2+, 4+, 6+ states, and first 2- and 3- states in ¹⁷⁶Hf by fast-timing γγ-coin using the ROSPHERE detector array for γ detection at the Bucharest FN Tandem accelerator. ^174,176,178Hf; deduced levels, B(E2) for ^174,176,178Hf, and B(E1), B(M2), B(E3) for ¹⁷⁶Hf. Systematics of g factors and B(E2) of first excited 2+ states, β₄ deformation parameters in ^{156,158,160,162,164,166,168,170}Er, ^{158,160,162,164,166,168,170,172,174,176}Yb, ^{162,164,166,168,170,172,174,176,178,180}Hf, ^{168,170,172,174,180,182,184,186}W, ^{178,180,182,184}Os. Comparison with values obtained in the rigid rotor limit and in the vibrator limit.

doi: 10.1103/PhysRevC.99.024316