Identification of excited states in 167Os and 168Os: shape coexistence at extreme neutron deficiency
✍ Scribed by D.T. Joss; S.L. King; R.D. Page; J. Simpson; A. Keenan; N. Amzal; T. Bäck; M.A. Bentley; B. Cederwall; J.F.C. Cocks; D.M. Cullen; P.T. Greenlees; K. Helariutta; P.M. Jones; R. Julin; S. Juutinen; H. Kankaanpää; H. Kettunen; P. Kuusiniemi; M. Leino; M. Muikku; A. Savelius; J. Uusitalo; S.J. Williams
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 355 KB
- Volume
- 689
- Category
- Article
- ISSN
- 0375-9474
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✦ Synopsis
Excited states in the very neutron-deficient isotopes 167 Os and 168 Os have been observed using the reaction 112 Sn( 58 Ni, 2pxn). The JUROSPHERE γ -ray spectrometer array was used in conjunction with the RITU gas-filled recoil separator to collect prompt γ radiation in coincidence with recoils implanted in a silicon strip detector located at the focal plane of RITU. Using a selective recoil decay tagging technique it has been possible to unambiguously assign γ -ray transitions to 167 Os and 168 Os through the characteristic α radioactivity of these nuclides. The high-spin structure of the bands is discussed in terms of quasiparticle configurations within the framework of the cranked shell model. The role of shape coexistence in 168 Os is examined with phenomenological three-band mixing calculations.