Acta Physica Polonica B

Vol. 40, No. 3, March 2009, page 555

Warm Nuclei: Nuclear Structure Effects on the Order-to-Chaos Transition Region

S. Leoni, G. Benzoni, N. Blasi, A. Bracco, S. Brambilla, F. Camera, A. Corsi, F.C.L. Crespi, P. Mason, B. Million, D. Montanari, M. Pignanelli, E. Vigezzi, O. Wieland, M. Matsuo, Y.R. Shimizu, P. Bednarczyk, M. Castoldi, D. Curien, G.G. Duchêne, B. Herskind, M. Kmiecik, A. Maj, W. Meczynski, J. Robin, J. Styczen, M. Zieblinski, K. Zuber, A. Zucchiatti

The \gamma -decay from the warm rotation in the transition region between order and chaos is studied in the superdeformed (SD) nuclei 151Tb and 196Pb, using the EUROBALL IV array. A number of observables, testing the decay dynamics in the SD well, are compared with predictions from a Monte Carlo simulation of the \gamma -decay based on microscopic calculations of discrete levels and decay probabilities. Agreement with the data is found only assuming an enhancement of the B(E1) strength around 1 MeV by a factor of 10–100, which is consistent with the evidence for octupole vibrations in both mass regions. The work shows the relevance of \gamma -spectroscopy in the order-to-chaos regime to highlight specific nuclear structure effects.

PACS numbers: 21.10.Re, 23.20.Lv, 25.70.Gh, 27.70.+q

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