Discovery of 157W and 161OsBianco, L., Page, R.D., Darby, I.G., Joss, D.T., Simpson, J., Al-Khalili, J.S., Cannon, A.J., Cederwall, B., Eeckhaudt, S., Ertürk, S., Gall, B., Hornillos, M.B. G., Grahn, T., Greenlees, P.T., Hadinia, B., Heyde, K., Jakobsson, U., Jones, P.M., Julin, R., Juutinen, S. , Ketelhut, S., Labiche, M., Leino, M., Leppänen, A.-P., Nyman, M., O'Donnell, D., Paul, E.S., Petri, M., Peura, P., Puurunen, A., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sapple, P.J., Sarén, J., Scholey, C., Smirnova, N.A., Steer, A.N., Stevenson, P.D., Suckling, E. B., Thomson, J., Uusitalo, J. and Venhart, M. (2010) Discovery of 157W and 161Os. Physics Letters B, 690 (1). pp. 15-18. ISSN 0370-2693 Full text not archived in this repository. It is advisable to refer to the publisher's version if you intend to cite from this work. See Guidance on citing. To link to this item DOI: 10.1016/j.physletb.2010.04.056 Abstract/SummaryThe 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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