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Discovery of W-157 and Os-161

Abstract : The nuclides 157W and 161Os have been discovered in reactions of 58Ni ion beams with a 106Cd target. The 161Os α-decay energy and half-life were 6890±12 keV and 640±60 μs. The daughter 157W nuclei β-decayed with a half-life of 275±40 ms, populating both low-lying α-decaying states in 157Ta, which is consistent with a 7/2− ground state in 157W. Fine structure observed in the α decay of 161Os places the lowest excited state in 157W with Iπ=9/2− at 318±30 keV. The branching ratio of View the MathML source indicates that 161Os also has a 7/2− ground state. Shell-model calculations analysing the effects of monopole shifts and a tensor force on the relative energies of 2f7/2 and 1h9/2 neutron states in N=83 isotones are presented.
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Submitted on : Monday, July 5, 2010 - 11:18:14 AM
Last modification on : Friday, June 5, 2020 - 10:52:07 AM

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L. Bianco, R.D. Page, I.G. Darby, D.T. Joss, J. Simpson, et al.. Discovery of W-157 and Os-161. Physics Letters B, Elsevier, 2010, 690, pp.15-18. ⟨10.1016/j.physletb.2010.04.056⟩. ⟨in2p3-00497513⟩

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