Recoil-decay tagging spectroscopy of 162 74 W 88
Li, H. J., Cederwall, B., Bäck, T., Qi, C., Doncel, M., Jakobsson, U., . . . Xiao, Z. G. (2015). Recoil-decay tagging spectroscopy of 162 74 W 88. Physical Review C, 92 (1), 014326. doi:10.1103/PhysRevC.92.014326
Published inPhysical Review C
Bäck, T. |
Qi, C. |
© 2015 American Physical Society. Published in this repository with the kind permission of the publisher.
Excited states in the highly neutron-deficient nucleus 162W have been investigated via the 92Mo(78Kr, 2α) 162W reaction. Prompt γ rays were detected by the JUROGAM II high-purity germanium detector array and the recoiling fusion-evaporation products were separated by the recoil ion transport unit (RITU) gas-filled recoil separator and identified with the gamma recoil electron alpha tagging (GREAT) spectrometer at the focal plane of RITU. γ rays from 162W were identified uniquely using mother-daughter and mother-daughter-granddaughter α-decay correlations. The observation of a rotational-like ground-state band is interpreted within the framework of total Routhian surface (TRS) calculations, which suggest an axially symmetric ground-state shape with a γ -soft minimum at β2 ≈ 0.15. Quasiparticle alignment effects are discussed based on cranked shell model calculations. New measurements of the 162W ground-state α-decay energy and half-life were also performed. The observed α-decay energy agrees with previous measurements. The half-life of 162W was determined to be t1/2 = 990(30) ms. This value deviates significantly from the currently adopted value of t1/2 = 1360(70) ms. In addition, the α-decay energy and half-life of 166Os were measured and found to agree with the adopted values. ...