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Probing the order-to-chaos region in superdeformed 151Tb and 196Pb nuclei with continuum gamma transitions
1Dipartimento di Fisica and INFN, Sezione di Milano,Via Celoria 16, 20133 Milano, Italy.
Abstract:
The gamma decay associated with the warm rotation of the superdeformed nuclei 151Tb and 196Pb has been measured with the EUROBALL IV array. Several independent quantities provide a stringent test of the population and decay dynamics in the superdeformed well. A Monte Carlo simulation of the gamma decay based on microscopic calculations gives remarkable agreement with the data only assuming a large enhancement of the B(E1) strength for 1-2 MeV gamma rays, which may be related to the evidence for octupole vibrations in both mass regions.
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