Naslov
Calculation of beta-decay rates in a relativistic model with momentum-dependent self-energies

Autori
Marketin, Tomislav ; Vretenar, Dario ; Ring, Peter

Izvornik
Physical Review C (0556-2813) 75 (2007), 2; 024304-7

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
PACS: 21.30.Fe; 21.60.Jz

Sažetak
The relativistic proton-neutron quasiparticle random phase approximation (PN-RQRPA) is applied in the calculation of - decay half-lives of neutron-rich nuclei in the Z28 and Z50 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 + 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 beta(-)-decay rates.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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