Phys.Rev. C 106, 024326 (2022)

A.Harter, L.Knafla, G.Friessner, G.Hafner, J.Jolie, A.Blazhev, A.Dewald, F.Dunkel, A.Esmaylzadeh, C.Fransen, V.Karayonchev, K.Lawless, M.Ley, J.-M.Regis, K.O.Zell

Lifetime measurements in the tungsten isotopes ^{176, 178, 180}W

NUCLEAR REACTIONS ¹⁶⁴Dy(¹⁶O, 4n)¹⁷⁶W, E=80 MeV; ¹⁷²Yb(⁹Be, 3n)¹⁷⁸W, E=40 MeV; ¹⁸¹Ta(p, 2n)¹⁸⁰W, E=16 MeV; measured E(ce), Eγ, (ce)γ-coin, (ce)γγ-coin, γγ-coin, level T_1/2 by (ce)γ(t) fast-timing method, and by recoil-distance Doppler-shift method using Cologne iron-free Orange spectrometer for conversion electrons, Cologne HORUS spectrometer for γ radiation, and Cologne coincidence plunger setup at the 10 MV FN Tandem accelerator of IKP-Cologne. ^176,178,180W; deduced levels, J, π, T_1/2, B(E2) of yrast positive-parity states up to 10+ for ¹⁷⁶W and up to 8+ for ^178,180W. Comparison with previous available experimental results, and with IBM-1 model calculations. Experimental and theoretical (by IBM-1 model with SU(3) and X(5) limits) systematics of excitation energies, deformation parameter β, quadrupole moment, B(E2), E(first 4+)/E(first 2+), B(E2)(first 4+)/B(E2)(first 2+) for ^{168,170,172,174,176,178,180,182,184,186}W.

doi: 10.1103/PhysRevC.106.024326