Recoil-decay tagging spectroscopy of 162 74 W 88
Li, H. J., Cederwall, B., Bäck, T., Qi, C., Doncel, M., Jakobsson, U., Auranen, K., Bönig, S., Drummond, M. C., Grahn, T., Greenlees, P., Herzan, A., Julin, R., Juutinen, S., Konki, J., Kröll, T., Leino, M., McPeake, C., O'Donnell, D., . . . Xiao, Z. G. (2015). Recoil-decay tagging spectroscopy of 162 74 W 88. Physical Review C, 92(1), Article 014326. https://doi.org/10.1103/PhysRevC.92.014326
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© 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.
...
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