Particle-Vibration Coupling Effect on the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>β</mml:mi></mml:mrow></mml:math>Decay of Magic Nuclei

Niu, Y.; Niu, Zhong-Ming; Colò, G.; Vigezzi, E.

doi:10.1103/physrevlett.114.142501

Cited by 75 publications

(63 citation statements)

References 51 publications

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“…In the following, we will present results obtained with the subtraction method (while we did not use it in our previous works [7,9,31]). We correspondingly modify the QRPA+QPVC equation (4), by writing…”

Section: Resultsmentioning

confidence: 99%

“…In both cases, it has been possible to show that a conspicuous spreading width is developed with the inclusion of PVC effects, and thus good agreement with experimental data for the GTR and the SDR is obtained. The RPA+PVC model has also been applied to β-decay [31], and great improvement with respect to mere RPA has been found as far as the description of the β-decay half-lives in magic nuclei is concerned.…”

Section: Introductionmentioning

confidence: 99%

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Quasiparticle random-phase approximation with quasiparticle-vibration coupling: Application to the Gamow-Teller response of the superfluid nucleusSn120

et al. 2016

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We propose a self-consistent quasi-particle random phase approximation (QRPA) plus quasiparticle-vibration coupling (QPVC) model with Skyrme interactions to describe the width and the line shape of giant resonances in open-shell nuclei, in which the effect of superfluidity should be taken into account in both the ground state and the excited states. We apply the new model to the Gamow-Teller resonance in the superfluid nucleus 120 Sn, including both the isoscalar spintriplet and the isovector spin-singlet pairing interactions. The strength distribution in 120 Sn is well reproduced and the underlying microscopic mechanisms, related to QPVC and also to isoscalar pairing, are analyzed in detail.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quasiparticle random-phase approximation with quasiparticle-vibration coupling: Application to the Gamow-Teller response of the superfluid nucleusSn120

et al. 2016

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“…A number of PVC models of various levels of refinement and self-consistency have been developed [12][13][14][15][16][17][18][19] and applied to studies of structure phenomena. In this work we present an approach based on nuclear DFT and the particle-core coupling scheme [1,6].…”

Section: Introductionmentioning

confidence: 99%

Beyond-mean-field boson-fermion model for odd-mass nuclei

2016

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A novel method for calculating spectroscopic properties of medium-mass and heavy atomic nuclei with an odd number of nucleons is introduced, based on the framework of nuclear energy density functional theory and the particle-core coupling scheme. The deformation energy surface of the even-even core, as well as the spherical single-particle energies and occupation probabilities of the odd particle(s), are obtained in a self-consistent mean-field calculation determined by the choice of the energy density functional and pairing interaction. This method uniquely determines the parameters of the Hamiltonian of the boson core, and only the strength of the particle-core coupling is specifically adjusted to selected data for a particular nucleus. The approach is illustrated in a systematic study of low-energy excitation spectra and transition rates of axially deformed odd-mass Eu isotopes.

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“…In this framework the coupling between the motion of single-nucleons and the collective vibrations (phonons) is considered, so that 2p2h configurations in the 1p1h⊗phonon coupling scheme, are explicitly taken into account. A non-relativistic version of the PVC approach has led to an overall good description of GT resonances and half-lives, using various Skyrme forces [19,20,21]. The so-called Relativistic Time-Blocking Approximation (RTBA) has also quite successfully investigated the effect of the particle-vibration coupling on Gamow-Teller and spin-dipole modes in a relativistic framework [22,23].…”

Section: Introductionmentioning

confidence: 99%

Nuclear response theory for spin-isospin excitations in a relativistic quasiparticle-phonon coupling framework

Robin

Литвинова

2016

Eur. Phys. J. A

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Abstract.A new theoretical approach to spin-isospin excitations in open-shell nuclei is presented. The developed method is based on the relativistic meson-exchange nuclear Lagrangian of Quantum Hadrodynamics and extends the response theory for superfluid nuclear systems beyond relativistic quasiparticle random phase approximation in the proton-neutron channel (pn-RQRPA). The coupling between quasiparticle degrees of freedom and collective vibrations (phonons) introduces a time-dependent effective interaction, in addition to the exchange of pion and ρ-meson taken into account without retardation. The time-dependent contributions are treated in the resonant time-blocking approximation, in analogy to previously developed relativistic quasiparticle time blocking approximation (RQTBA) in the neutral (non-isospin-flip) channel. The new method is called proton-neutron RQTBA (pn-RQTBA) and applied to Gamow-Teller resonance in a chain of neutron-rich Nickel isotopes 68−78 Ni. A strong fragmentation of the resonance along with quenching of the strength, as compared to pn-RQRPA, is obtained. Based on the calculated strength distribution, beta-decay half-lives of the considered isotopes are computed and compared to pn-RQRPA half-lives and to experimental data. It is shown that a considerable improvement of the half-life description is obtained in pn-RQTBA because of the spreading effects, which bring the lifetimes to a very good quantitative agreement with data.PACS. 21.60.Jz Nuclear Density Functional Theory and extensions (includes Hartree-Fock and randomphase approximations) -23.40.-s beta-decay; double beta-decay; electron and muon capture -21.10.Tg Lifetimes, widths

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Particle-Vibration Coupling Effect on theβDecay of Magic Nuclei

Cited by 75 publications

References 51 publications

Quasiparticle random-phase approximation with quasiparticle-vibration coupling: Application to the Gamow-Teller response of the superfluid nucleusSn120

Quasiparticle random-phase approximation with quasiparticle-vibration coupling: Application to the Gamow-Teller response of the superfluid nucleusSn120

Beyond-mean-field boson-fermion model for odd-mass nuclei

Nuclear response theory for spin-isospin excitations in a relativistic quasiparticle-phonon coupling framework

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