2007/01/10 by T. Marketin, D. Vretenar, P. Ring · 1 citation
Engineering · Physics and Astronomy · #Atomic physics #Isoscalar #Mean field theory #Meson #Momentum (technical analysis) #Neutron #Nuclear Physics and Applications #Nuclear matter #Nuclear physics #Nuclear physics research studies #Nuclear reactor physics and engineering #Nucleon #Pairing #Particle physics #Physics #Quantum electrodynamics #Quantum mechanics #Quasiparticle #Random phase approximation #nucl-th
paper · pdf · doi:10.1103/physrevc.75.024304
published as Phys.Rev.C75:024304,2007 · 16 pages, 3 figures, submitted to Physical Review C
arxiv created 2007/01/10 · openalex publication_date 2007/02/15 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The relativistic proton-neutron quasiparticle random phase approximation (PN-RQRPA) is applied in the calculation of \ensuremathβ-decay half-lives of neutron-rich nuclei in the Z\ensuremath≈28 and Z\ensuremath≈50 regions. The study is based on the relativistic Hartree-Bogoliubov calculation of nuclear ground states, using effective Lagrangians with density-dependent meson-nucleon couplings, and also extended by the inclusion of couplings between the isoscalar meson fields and the derivatives of the nucleon fields. This leads to a linear momentum dependence of the scalar and vector nucleon self-energies. The residual QRPA interaction in the particle-hole channel includes the \ensuremathπ+\ensuremathρ exchange plus a Landau-Migdal term. The finite-range Gogny interaction is employed in the T=1 pairing channel, and the model also includes a proton-neutron particle-particle interaction. The results are compared with available data, and it is shown that an extension of the standard relativistic mean-field framework to include momentum-dependent nucleon self-energies naturally leads to an enhancement of the effective (Landau) nucleon mass, and thus to an improved PN-QRPA description of \ensuremathβ^\ensuremath--decay rates.