A microscopic model aimed at the description of charge-exchange nuclear excitations along isotopic chains which include open-shell systems is developed. It consists of the quasiparticle random phase approximation (QRPA) made on top of Hartree-Fock-Bardeen-Cooper-Schrieffer (HF-BCS). The calculations are performed by using the Skyrme interaction in the particle-hole channel and a zero-range, density-dependent pairing force in the particle-particle channel. At variance with the (many) versions of QRPA which are available in the literature, in our work special emphasis is put on the full self-consistency. Its importance, as well as the role played by the charge-breaking terms of the nuclear Hamiltonian, like the Coulomb interaction, the charge symmetry and charge independence breaking (CSB-CIB) forces and the electromagnetic spin-orbit, are elucidated by means of numerical calculations of the isobaric analog resonances (IAR). The theoretical energies of these states along the chain of the Sn isotopes agree well with the experimental data in the stable isotopes. Predictions for unstable systems are presented.

The fully self-consistent charge-exchange QRPA and its application to the Isobaric Analog Resonances / S. Fracasso, G. Colo'. - In: PHYSICAL REVIEW. C, NUCLEAR PHYSICS. - ISSN 0556-2813. - 72:6(2005), pp. 064310.64310-1-064310.64310-9. [10.1103/PhysRevC.72.064310]

The fully self-consistent charge-exchange QRPA and its application to the Isobaric Analog Resonances

S. Fracasso;G. Colo'
2005

Abstract

A microscopic model aimed at the description of charge-exchange nuclear excitations along isotopic chains which include open-shell systems is developed. It consists of the quasiparticle random phase approximation (QRPA) made on top of Hartree-Fock-Bardeen-Cooper-Schrieffer (HF-BCS). The calculations are performed by using the Skyrme interaction in the particle-hole channel and a zero-range, density-dependent pairing force in the particle-particle channel. At variance with the (many) versions of QRPA which are available in the literature, in our work special emphasis is put on the full self-consistency. Its importance, as well as the role played by the charge-breaking terms of the nuclear Hamiltonian, like the Coulomb interaction, the charge symmetry and charge independence breaking (CSB-CIB) forces and the electromagnetic spin-orbit, are elucidated by means of numerical calculations of the isobaric analog resonances (IAR). The theoretical energies of these states along the chain of the Sn isotopes agree well with the experimental data in the stable isotopes. Predictions for unstable systems are presented.
HF calculations; isobaric analogue resonances; nuclear forces; nuclei with mass number 90 to 149; RPA calculations
Settore FIS/01 - Fisica Sperimentale
2005
Article (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/16659
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