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

Roger Thompson, A. Ikeda, R. K. Sheline, J. C. Cunnane, S. W. Yates, P. J. Daly

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19 Scopus citations


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 3 2[512] orbital. Since the 188Os ground state contains admixtures of both K = 3 2and K = 1 2 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 = 1 2 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.

Original languageEnglish
Pages (from-to)444-460
Number of pages17
JournalNuclear Physics, Section A
Issue number3
StatePublished - Jul 7 1975

Bibliographical note

Funding Information:
The level structure of the transitional nucleus ~SSOs has been investigated principally in studies of the radioactive decay of 17 h lSSRe \[-refs. 1-9)\] and 41 h 18SIr \[refs. 6, 9, 10)\]. In early analyses of the decay results, Warner and Sheline 6) and Yamazaki 7) concluded that the 188Os level scheme was more consistent with the Bohr-Mottelson symmetric rotor description ~x) than with the Davydov-Fillipov * Present address : Nuclear Structure Research Laboratory, The University of Rochester, Rochester, New York 14627. *t Work supported by the US Atomic Energy Commission and in part by the National Science Foundation. *** Present address: t Work supported Argonne National Laboratory, Argonne, Illinois 60439. by the US Atomic Energy Commission. 444


  • Nuclear reactions
  • Radioactivity

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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