Elsevier

Nuclear Physics A

Volume 245, Issue 3, 7 July 1975, Pages 444-460
Nuclear Physics A

Levels of 188os populated in the 189Os(d, t)188Os reaction and in the decay of 41h 188Ir

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Abstract

The 0 level structure of 188Os has been investigated by the 189Os(d, t)188Os reaction using a broad range magnetic spectrograph, and the properties of the 188Os levels populated in the decay of 188Ir have been re-examined. The (d, t) results yield new information about the location of two-neutron excitations in 188Os involving the 32[512] orbital. Since the 188Os ground state contains admixtures of both K = 32and K = 12 character, cross-section formulae for single-neutron transfer from a target state which is not pure in K are considered, and it is found that rather small K = 12 admixtures in the 189Os ground state give rise to striking interference effects, which are manifested in the experimental (d, t) cross sections into the members of the 188Os ground state band. The consequences of the mixed character of the target state on the (d, t) population of members of the Kπ = 2+ γ-vibration and of higher-lying two-quasiparticle bands are also discussed.

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    Present address : Nuclear Structure Research Laboratory, The University of Rochester, Rochester, New York 14627.

    †††

    Present address: Argonne National Laboratory, Argone, Illinois 60439.

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