Acta Physica Polonica B

Vol. 40, No. 3, March 2009, page 725

Search for Fingerprints of Tetrahedral Symmetry in 156Gd

Q.T. Doan, D. Curien, O. Stęzowski, J. Dudek, K. Mazurek, A. Góźdź, J. Piot, G. Duchêne, B. Gall, H. Molique, M. Richet, P. Medina, D. Guinet, N. Redon, Ch. Schmitt, P. Jones, P. Peura, S. Ketelhut, M. Nyman, U. Jakobsson, P.T. Greenlees, R. Julin, S. Juutinen, P. Rahkila, A. Maj, K. Zuber, P. Bednarczyk, N. Schunck, J. Dobaczewski, A. Astier, I. Deloncle, D. Verney, G. de Angelis, J. Gerl

Theoretical predictions suggest the presence of tetrahedral symmetry as an explanation for the vanishing intra-band E2 transitions at the bottom of the odd-spin negative-parity band in 156Gd. The present study reports on experiment performed to address this phenomenon. It allowed to remove certain ambiguouities related to the intra-band E2 transitions in the negative-parity bands, to determine the new inter-band transitions and reduced probability ratios B(E2)/B(E1) and, for the first time, to determine the experimental uncertainties related to the latter observable.

PACS numbers: 23.20.En, 21.65.–f, 21.10.Ma, 21.60.–n

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