Barrier penetration and rotational damping of thermally excited superdeformed nuclei
✍ Scribed by K. Yoshida; M. Matsuo; Y.R. Shimizu
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 581 KB
- Volume
- 696
- Category
- Article
- ISSN
- 0375-9474
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✦ Synopsis
We construct a microscopic model of thermally excited superdeformed states that describes both the barrier penetration mechanism, leading to the decay-out transitions to normal deformed states, and the rotational damping causing fragmentation of rotational E2 transitions. We describe the barrier penetration by means of a tunneling path in the two-dimensional deformation energy surface, which is calculated with the cranked Nilsson-Strutinsky model. The individual excited superdeformed states and associated E2 transition strengths are calculated by the shell-model diagonalization of the many-particle-many-hole excitations interacting with the delta-type residual two-body force. The effects of the decay-out on the excited superdeformed states are discussed in detail for 152 Dy, 143 Eu and 192 Hg. The model predicts that the decay-out brings about a characteristic decrease in the effective number of excited superdeformed rotational bands.