dorsal/arxiv
View SchemaNew results for the fully renormalized proton-neutron quasiparticle random phase approximation
| Authors | C. M. Raduta, A. A. Raduta |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0501004 |
| URL | https://arxiv.org/abs/nucl-th/0501004 |
| DOI | 10.1016/j.nuclphysa.2005.03.013 |
| Journal | Nucl.Phys.A756:153-175,2005 |
Abstract
A many-body Hamiltonian describing a system of Z protons and N neutrons moving in spherical shell model mean field and interacting among themselves through proton-proton and neutron-neutron pairing and a dipole-dipole proton-neutron interaction of both particle-hole and particle-particle type, is treated within a fully renormalized (FR) pnQRPA approach. Two decoupling schemes are formulated. One of them decouples the equations of motion of particle total number conserving and non-conserving operators. One ends up with two very simple dispersion equations for phonon operators which are formally of Tamm-Dancoff types. For excitations in the (N-1,Z+1) system, Ikeda sum rule is fully satisfied provided the BCS equations are renormalized as well and therefore solved at a time with the FRpnQRPA equations. Next, one constructs two operators ${\cal R}^{\dagger}_{1\mu}$, ${\cal R}_{1,-\mu}(-)^{1-\mu}$ which commutes with the particle total number conserving operators, ${\cal A}^{\dagger}_{1\mu}$ and ${\cal A}_{1,-\mu}(-)^{1-\mu}$, and moreover could be renormalized so that they become bosons. Then, a phonon operator is built up as a linear combination of these four operators. The FRpnQRPA equations are written down for this complex phonon operator and the ISR is calculated analytically. This formalism allows for an unified description of the dipole excitations in four neighboring nuclei (N-1,Z+1),(N+1,Z-1),(N-1,Z-1),(N+1,Z+1). The phonon vacuum describes the (N,Z) system ground state.
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"abstract": "A many-body Hamiltonian describing a system of Z protons and N neutrons\nmoving in spherical shell model mean field and interacting among themselves\nthrough proton-proton and neutron-neutron pairing and a dipole-dipole\nproton-neutron interaction of both particle-hole and particle-particle type, is\ntreated within a fully renormalized (FR) pnQRPA approach. Two decoupling\nschemes are formulated. One of them decouples the equations of motion of\nparticle total number conserving and non-conserving operators. One ends up with\ntwo very simple dispersion equations for phonon operators which are formally of\nTamm-Dancoff types. For excitations in the (N-1,Z+1) system, Ikeda sum rule is\nfully satisfied provided the BCS equations are renormalized as well and\ntherefore solved at a time with the FRpnQRPA equations. Next, one constructs\ntwo operators ${\\cal R}^{\\dagger}_{1\\mu}$, ${\\cal R}_{1,-\\mu}(-)^{1-\\mu}$ which\ncommutes with the particle total number conserving operators, ${\\cal\nA}^{\\dagger}_{1\\mu}$ and ${\\cal A}_{1,-\\mu}(-)^{1-\\mu}$, and moreover could be\nrenormalized so that they become bosons. Then, a phonon operator is built up as\na linear combination of these four operators. The FRpnQRPA equations are\nwritten down for this complex phonon operator and the ISR is calculated\nanalytically. This formalism allows for an unified description of the dipole\nexcitations in four neighboring nuclei (N-1,Z+1),(N+1,Z-1),(N-1,Z-1),(N+1,Z+1).\nThe phonon vacuum describes the (N,Z) system ground state.",
"arxiv_id": "nucl-th/0501004",
"authors": [
"C. M. Raduta",
"A. A. Raduta"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/j.nuclphysa.2005.03.013",
"journal_ref": "Nucl.Phys.A756:153-175,2005",
"title": "New results for the fully renormalized proton-neutron quasiparticle random phase approximation",
"url": "https://arxiv.org/abs/nucl-th/0501004"
},
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