Number conserving particle-hole RPA for superfluid nuclei

We present a number conserving particle-hole RPA theory for collective excitations in the transition from normal to superfluid nuclei. The method derives from an RPA theory developed long ago in quantum chemistry using antisymmetric geminal powers, or equivalently number projected HFB states, as ref...

Full description

Saved in:
Bibliographic Details
Published in:Physics letters. B 2019-08, Vol.795, p.537-541
Main Authors: Dukelsky, J., García-Ramos, J.E., Arias, J.M., Pérez-Fernández, P., Schuck, P.
Format: Article
Language:English
Subjects:
Number conserving particle-hole RPA
Number projected HFB
Superfluid nuclei
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We present a number conserving particle-hole RPA theory for collective excitations in the transition from normal to superfluid nuclei. The method derives from an RPA theory developed long ago in quantum chemistry using antisymmetric geminal powers, or equivalently number projected HFB states, as reference states. We show within a minimal model of pairing plus monopole interactions that the number conserving particle-hole RPA excitations evolve smoothly across the superfluid phase transition close to the exact results, contrary to particle-hole RPA in the normal phase and quasiparticle RPA in the superfluid phase that require a change of basis at the broken symmetry point. The new formalism can be applied in a straightforward manner to study particle-hole excitations on top of a number projected HFB state.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2019.07.003