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.
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. Duchene, B. Herskind, M. Kmiecik, A. Maj, W. Meczynski, J. Robin, J. Styczen, M. Zieblinski, K. Zuber, A. Zucchiatti. - In: ACTA PHYSICA POLONICA B. - ISSN 0587-4254. - 40:3(2009), pp. 555-564. ((Intervento presentato al convegno Zakopane conference in nuclear physics tenutosi a Zakopane, Poland nel 2008.
Warm nuclei : nuclear structure effects on the order-to-chaos transition region
S. Leoni;G. Benzoni;A. Bracco;F. Camera;A. Corsi;F. C. L. Crespi;P. Mason;D. Montanari;M. Pignanelli;
2009
Abstract
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.
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