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Physical Review Letters 100 (2008) 102501
Motional narrowing and ergodic bands in excited superdeformed states of 194Hg
Araceli Lopez-Martens1, Thomas Døssing2, Teng Lek Khoo3, Masayuki Matsuo, Bent Herskind2, Torben Lauritsen3, Michael A. Carpenter3, Robert Janssens3, Greg Hackman, I-Yang Lee4, Augusto Macchiavelli4, Enrico Vigezzi5, K. Yoshida

The Egamma-Egamma coincidence spectra from the electromagnetic decay of excited superdeformed states in 194Hg reveal surprisingly narrow ridges, parallel to the diagonal. 100-150 excited bands are found to contribute to these ridges, which account for nearly all the unresolved E2 decay strength. Comparison with theory suggests that these excited bands have many components in their wavefunctions, yet they display remarkable rotational coherence. This phenomenon can be explained in terms of the combination of shell effects and motional narrowing.
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
2 :  NBI - Niels Bohr Institute
3 :  ANL - Argonne National Laboratory
4 :  LBNL - Lawrence Berkeley National Laboratory
5 :  INFN - Istituto Nazionale di Fisica Nucleare [Milano]
Physique/Physique Nucléaire Expérimentale
nuclear structure – superdeformation – chaos – rotational damping – motional narrowing