High-spin states in 222Th
作者： D. Ward , G.D. Dracoulis , J.R. Leigh , R.J. Charity , D.J. Hinde
DOI: 10.1016/0375-9474(83)90379-2
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摘要: Abstract Levels to spin 16 + in the ground band and 17 − octupole 222 Th have been identified using reaction 208 Pb( 18 O, 4n) at 93 MeV. To suppress intense γ-ray background from fission a residue detector was built operated coincidence with Ge(Li) NaI(Tl) detectors. The apparent moment of inertia ground-state rotational rises very rapidly increasing spin, however, no indications backbending were observed. low has an aligned angular momentum J ≈ 3 h relative band. Strong cross-band E1 transitions competed collective E2 within each Analysis showed that ratios B( E 1) 2) experimental uncertainty independent both parity parent state. average multiplicity per cascade measured for Th. results reasonable agreement computer code ORNL-ALICE.
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