E0 transitions in 202,204Pb and intruder-state systamatics of even-even lead isotopes

The interplay between particle-particle and particle-hole terms of the residual interaction is discussed in connection with the microscopic description of 2
 1
 +
 states in single-closed shell nuclei. The consistency of the quasi-particle random-phase approximation is examined and found to be guaranteed by the inclusion in the calculations of particle-particle diagrams.

Peculiarities of the microscopic description of quadrupole excitations in single-closed shell nuclei

The microscopic description of the first 2+ and 3− levels of spherical nuclei (90≦A≦150 and 186≦A≦206) is examined, both in the Tamm-Dancoff and the Random Phase Approximations. Peculiar effects of the schematic model are discussed. The consistency of the theory is investigated.

Peculiarities of the microscopic description of multipole excitations: Doubly-open shell spherical nuclei

The relationship between collectivity and ground state correlations is analyzed for the single closed shell lead isotopes. The effects of the schematic approximation are discussed, within the framework of both the quasiparticle Random Phase Approximation and the quasiparticle Tamm-Dancoff approach. The consistency of the RPA is investigated.

S.M. Peltier

Papers

Schematicity and ground state correlations in the lead isotopes

Peculiarities of the microscopic description of quadrupole excitations in single-closed shell nuclei

A possible test for ground-state correlations in superfluid nuclei

Consistency tests in QRPA calculations