Octupole correlations in 225Th

J. R. Hughes*, R. Tölle, J. De Boer, P. A. Butler, C. Günther, V. Grafen, N. Gollwitzer, V. E. Holliday, G. D. Jones, C. Lauterbach, M. Marten-Tölle, S. M. Mullins, R. J. Poynter, R. S. Simon, N. Singh, R. J. Tanner, R. Wadsworth, D. L. Watson, C. A. White

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

The nuclear structure of 225Th has been studied using the reaction 226Ra(α, 5n) 225Th at a beam energy of 50 MeV. In-beam γγ, e-e-, e-n and e-γ coincidences have been measured, along with γ-ray and electron intensities, and these have been used to establish a decay scheme up to spin 39/2h{stroke} and excitation energy 2494 keV. Parity doublets have been observed, forming two "quasimolecular bands", along with enhanced E1 transitions linking states of opposite parity. γ-branching ratios have been measured and an average value of |D0/Q0| = (0.51±0.06)×10-3fm-1 has been deduced. The results are compared with calculations incorporating odd multipole degrees of freedom in the description of the nuclear shape.

Original languageEnglish
Pages (from-to)275-293
Number of pages19
JournalNuclear Physics, Section A
Volume512
Issue number2
DOIs
Publication statusPublished - 1990
Externally publishedYes

Bibliographical note

Funding Information:
We thank Dr. J. Eberth for the loan of the neutron detector, and Dr. H.J. Maier for providing the n6Ra target. We would also like to thank the crews at the Bonn cyclotron and the Daresbury NSF for providing the beams used in this work. This work was supported by the UK Science and Engineering Research Council, from whom J.R. Hughes, S.M. Mullins,. R.J. Poynter and C.A. White acknowledge receipt of SERC postgraduate studentships, the Bundesminister fiir Forschung und Technologic (grants No. 06BN451 and 06LM177II) and by the Minister fiir Wissenschaft und Forschung des Landes Nordrhein-Westfalen.

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