Electric dipole moments in 230, 232U and implications for tetrahedral shapes

Ntshangase S.S. ; Bark R.A. ; Aschman D.G. ; Bvumbi S. ; Datta P. ; Davidson P.M. ; Dinoko T.S. ; Elbasher M.E.A. ; Juhasz K. ; Khaleel E.M.A. ; Krasznahorkay A. ; Lawrie E.A. ; Lawrie J.J. ; Lieder R.M. ; Majola S.N.T. ; Masiteng P.L. ; Mohammed H. ; Mullins S.M. ; Nieminen P. ; Nyako B.M. ; Papka P. ; Roux D.G. ; Sharpey-Shafer J.F. ; Shirinda O. ; Stankiewicz M.A. ; Timar J. ; Wilson A.N. (2010)


The nuclei 230U and 232U were populated in the compound nucleus reactions 232Th(α,6n) and 232Th(α,4n), respectively. Gamma rays from these nuclei were observed in coincidence with a recoil detector. Acomprehensive set of in-band E2 transitions were observed in the lowest lying negative-parity band of 232Uwhile one E2 transition was also observed for 230U. These allowed B(E1; I - → I + - 1)/B(E2; I - → I - - 2) ratios to be extracted and compared with systematics. The values are similar to those of their Th and Ra isotones. The possibility of a tetrahedral shape for the negative-parity U bands appears difficult to reconcile with the measured Q2 values for the isotone 226Ra. © 2010 The American Physical Society.

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