Erratum: Relativistic quasiparticle time blocking approximation: Dipole response of open-shell nuclei [Phys. Rev. C 78, 014312 (2008)]

Литвинова, Елена; Ring, P.; Tselyaev, V.

doi:10.1103/physrevc.78.049902

Cited by 88 publications

(272 citation statements)

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“…In fact, such couplings have been introduced successfully in the relativistic scheme using the spectral representation in Refs. [24]. On the non-relativistic side, such techniques have also been used in the context of the non-spectral representation without [62,63] and with [64] pairing.…”

Section: Discussionmentioning

confidence: 99%

“…is not described well in this simple RPA approach. It has been shown in recent investigations of the coupling to complex configurations within the framework of the relativistic time-blocking approximation (RTBA) or the relativistic quasiparticle-time-blocking approximation (RQTBA) [24] that such couplings can be taken into account successfully in a fully consistent way starting from one density functional E[ρ]. So far, relativistic investigations of this type have been carried out with discrete methods.…”

Section: Isoscalar Giant Monopole Resonancesmentioning

confidence: 99%

“…Their essential advantage is of course the fact that the zero range of the effective interaction reduces considerably the numerical effort in practical applications. Because of their simplicity they are nowadays much used in many complex calculations going beyond the mean field approach [24,25]. However, so far they have not been used much for the dynamic investigations and it is only quite recently that a code has been developed to diagonalize the RPA equations for relativistic Point Coupling models [21] and it has been shown that this latter approach reproduces excitation and collective phenomena, in particular Giant Multipole Resonances, with a quality comparable to that of standard finite-range forces.…”

Section: Introductionmentioning

confidence: 99%

“…In particular one needs simpler forces for applications going beyond the mean field approach such as Particle Vibrational Coupling (PVC) [24] or configuration mixing calculations in the framework of the Generator Coordinate Method (GCM) [25]. Therefore over the years several attempts have been made to develop relativistic point coupling (PC) models with forces of zero range [26], in analogy to non-relativistic Skyrme-functionals.…”

Section: Introductionmentioning

confidence: 99%

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Continuum random-phase approximation for relativistic point coupling models

Daoutidis

Ring

2009

Phys. Rev. C

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Relativistic Continuum Random Phase Approximation (CRPA) is used to investigate collective excitation phenomena in several spherical nuclei along the periodic table. We start from relativistic mean field calculations based on a covariant density functional with density dependent zero range forces. From the same functional an effective interaction is obtained as the second derivative with respect to the density. This interaction is used in relativistic continuum-RPA calculations for the investigation of isoscalar monopole, isovector dipole and isoscalar quadrupole resonances of spherical nuclei. In particular we study the low-lying E1 strength in the vicinity of the neutron evaporation threshold. The properties of the resonances, such as centroid energies and strengths distributions are compared with results of discrete RPA calculations for the same model as well as with experimental data.

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Section: Discussionmentioning

confidence: 99%

Section: Isoscalar Giant Monopole Resonancesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Continuum random-phase approximation for relativistic point coupling models

Daoutidis

Ring

2009

Phys. Rev. C

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“…These approaches have been supplemented by considering a self-consistent mean field (see, e.g., Ref [5]) or the self-consistency between the mean-field and the effective interaction [6][7][8]. The latter made it possible to perform the calculation with one unique set of interaction parameters (e.g., the Skyrme force [6,8]) instead of two sets of parameters as used in non-self-consistent approaches (one for the effective interaction and another for the mean field).…”

Section: Introductionmentioning

confidence: 99%

Self-consistent calculations of the strength function and radiative neutron capture cross section for stable and unstable tin isotopes

Авдеенков

Goriely²,

Kamerdzhiev

et al. 2011

Phys. Rev. C

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The E1 strength function for 15 stable and unstable Sn even-even isotopes from A = 100 to A = 176 are calculated using a self-consistent microscopic theory which, in addition to the standard (quasiparticle) randomphase approximation [(Q)RPA] approach, takes into account phonon coupling and the single-particle continuum (by means of the discretization procedure) with a cutoff of 100 MeV. Our analysis shows two distinct regions for which the integral characteristics of both the giant and pygmy resonances behave rather differently. For neutron-rich nuclei, starting from 132 Sn, we obtain a giant E1 resonance which significantly deviates from the widely used systematics extrapolated from experimental data in the β-stability valley. We show that the inclusion of phonon coupling is necessary for a proper description of the low-energy pygmy resonances and the corresponding transition densities for A < 132 nuclei, while in the A > 132 region the influence of phonon coupling is significantly smaller. The radiative neutron capture cross sections leading to the stable 124 Sn and unstable 132 Sn and 150 Sn nuclei are calculated with both the (Q)RPA and the beyond-(Q)RPA strength functions and shown to be sensitive to both the predicted low-lying strength and the phonon-coupling contribution. The comparison with the widely used phenomenological generalized Lorentzian approach shows considerable differences both for the strength function and the radiative neutron capture cross section. In particular, for the neutron-rich 150 Sn, the reaction cross section is found to be increased by a factor greater than 20. We conclude that the present approach may provide a complete and coherent description of the γ -ray-strength function for astrophysics applications. In particular, such calculations are highly recommended for a reliable estimate of the electromagnetic properties of exotic nuclei.

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Low-lying dipole response in the relativistic quasiparticle time blocking approximation and its influence on neutron capture cross sections

et al. 2009

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We have computed dipole strength distributions for nickel and tin isotopes within the Relativistic Quasiparticle Time Blocking Approximation (RQTBA). These calculations provide a good description of data, including the neutron-rich tin isotopes (130.132)Sn. The resulting dipole strengths have been implemented in Hauser-Feshbach calculations of astrophysical neutron capture rates relevant for r-process nucleosynthesis studies. The RQTBA calculations show the presence of enhanced dipole strength at energies around the neutron threshold for neutron rich nuclei. The computed neutron capture rates are sensitive to the fine structure of the low lying dipole strength. which emphasizes the importance of a reliable knowledge of this excitation mode. (C) 2009 Elsevier B.V. All rights reserved

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Erratum: Relativistic quasiparticle time blocking approximation: Dipole response of open-shell nuclei [Phys. Rev. C 78, 014312 (2008)]

Cited by 88 publications

References 0 publications

Continuum random-phase approximation for relativistic point coupling models

Continuum random-phase approximation for relativistic point coupling models

Self-consistent calculations of the strength function and radiative neutron capture cross section for stable and unstable tin isotopes

Low-lying dipole response in the relativistic quasiparticle time blocking approximation and its influence on neutron capture cross sections

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