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The nuclear structure of 229Th

✍ Scribed by K. Gulda; W. Kurcewicz; A.J. Aas; M.J.G. Borge; D.G. Burke; B. Fogelberg; I.S. Grant; E. Hagebø; N. Kaffrell; J. Kvasil; G. Løvhøiden; H. Mach; A. Mackova; T. Martinez; G. Nyman; B. Rubio; J.L. Tain; O. Tengblad; T.F. Thorsteinsen

Book ID
104335238
Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
373 KB
Volume
703
Category
Article
ISSN
0375-9474

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✦ Synopsis

The γ-rays following the β -decay of 229 Ac have been investigated by means of γ-ray singles and γγ-coincidence measurements using Ge detectors. Multipolarities of 40 transitions in 229 Th have been established by measuring conversion electrons with a mini-orange electron spectrometer. The half-lives of the 146.35, 164.53 and 261.96 keV levels have been measured using the advanced time delayed βγγ(t) method. The low-lying states in 229 Th and observed transition rates have been interpreted within the quasiparticle-phonon model with inclusion of Coriolis coupling. Two octupole correlated parity partner bands, with K π = 5/2 ± and K π = 3/2 ± , were identified in 229 Th.

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