BIANCO, L.; PAGE, R.D.; DARBY, I.G.; JOSS, D.T.; SIMPSON, J.; AL-KHALILI, J.J.; 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.; STEER, A.N.; STEVENSON, P.D.; SUCKLING, E.B.; THOMSON, J.; UUSITALO, J.; VENHART, M.

doi:10.1016/j.physletb.2010.04.056

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Physics Letters B. 2010-06-07, vol. 690, p. 15-18

Elsevier

Résumé en anglais

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.< Réduire

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Nuclear reactions

300

310 MeV beam energy

gas-filled recoil separator

Si detectors

Measured

Eα

t1/2

Deduced

neutron single-particle configurations in 161Os

157W

Shell model calculations

58Ni

106Cd at 290

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Discovery of W-157 and Os-161

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