Configuration mixing in the neutron-deficient $^{186-196}$Pb isotopes

TL;DR

This paper uses the interacting boson model with configuration mixing to analyze energy levels, transition rates, and deformations in neutron-deficient lead isotopes, revealing complex state mixing and challenging existing classifications.

Contribution

It provides detailed theoretical calculations of energy levels, transition rates, and quadrupole deformations in $^{186-196}$Pb, highlighting the importance of configuration mixing in these isotopes.

Findings

Identification of significant configuration mixing effects.

Reassessment of level classifications in $^{190-194}$Pb.

Quantitative estimates of quadrupole deformations.

Abstract

In this article we report the results of detailed interacting boson model calculations with configuration mixing for the neutron-deficient Pb isotopes. Calculated energy levels and $B(E2)$ values for $^{188-196}$Pb are discussed and some care is suggested concerning the current classification on the basis of level systematics of the $4_1^+$ and $6_1^+$ states in $^{190-194}$Pb. Furthermore, quadrupole deformations are extracted for $^{186-196}$Pb and the mixing between the different families (0p-0h, 2p-2h, and 4p-4h) is discussed in detail. Finally, the experimental and the theoretical level systematics are compared.