Barrier penetration and rotational damping of thermally excited superdeformed nuclei

Abstract

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 effect of the decay-out on the excited superdeformed states are discussed in detail for ${}^{152}$Dy, ${}^{143}$Eu and ${}^{192}$Hg.

33pages, 32 figures, submitted to Nucl.Phys.A

References in corpus (6)

• Simple model for decay of superdeformed nuclei
• Shell Model for Warm Rotating Nuclei
• Decay out of a Superdeformed Band
• Spreading Width for Decay out of a Superdeformed Band
• Theoretical study of the decay-out spin of superdeformed bands in the Dy and Hg regions
• Shell Effects on Rotational Damping in Superdeformed Nuclei

Cited by in corpus (9)

• Open problems in microscopic theory of large-amplitude collective motion
• Nuclear size and rapidity dependence of the saturation scale from QCD evolution and experimental data
• Microscopic derivation of the Bohr-Mottelson collective Hamiltonian and its application to quadrupole shape dynamics
• Probing the order-to-chaos region in superdeformed 151Tb and 196Pb nuclei with continuum gamma-transitions
• Energy averages and fluctuations in the decay out of superdeformed bands
• Microscopic Determinations of Fission Barriers, (MEAN-Field and Beyond)
• Rotational damping in a multi-$j$ shell particles-rotor model
• Addendum: Attenuation of the intensity within a superdeformed band
• Variance of the decay intensity of superdeformed bands