A study of Gamow-Teller transitions for N = Z nuclei, 24Mg, 28Si, and 32S, by a deformed QRPA

Ha, Eunja; Cheoun, Myung-Ki

doi:10.1140/epja/i2017-12216-7

Cited by 15 publications

(3 citation statements)

References 46 publications

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“…Ever since, the GTR represents one of the most extensively investigated collective excitation in nuclear physics (for more details see e.g., [408,409]). More recent interest in the GTR is motivated by its relevance for understanding nuclear structure and spin-isospin dependence of modern effective interactions [410,411,412,413,414,415,416,417], nuclear beta decay [418,419,420] and beta delayed neutron emission [421]and double-beta decay [422,423,424,425,426,427,428,429]. Detailed knowledge of GT ± transitions, not only in stable nuclei but also away from the valley of stability, is of a particular importance for understanding weak interaction rates in stellar environment [430,431,432,433,434], r-process stellar nucleosynthesis [435,436] and nuclear response to low-energy neutrinos of relevance for neutrino detectors and neutrino nucleosynthesis in stellar environment [437,438,439,440,441,442,443].…”

Section: Gamow-teller Resonancementioning

confidence: 99%

Nuclear equation of state from ground and collective excited state properties of nuclei

Roca-Maza

Paar

2018

Progress in Particle and Nuclear Physics

194

110

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This contribution reviews the present status on the available constraints to the nuclear equation of state (EoS) around saturation density from nuclear structure calculations on ground and collective excited state properties of atomic nuclei. It concentrates on predictions based on self-consistent mean-field calculations, which can be considered as an approximate realization of an exact energy density functional (EDF). EDFs are derived from effective interactions commonly fitted to nuclear masses, charge radii and, in many cases, also to pseudo-data such as nuclear matter properties. Although in a model dependent way, EDFs constitute nowadays a unique tool to reliably and consistently access bulk ground state and collective excited state properties of atomic nuclei along the nuclear chart as well as the EoS. For comparison, some emphasis is also given to the results obtained with the so called ab initio approaches that aim at describing the nuclear EoS based on interactions fitted to few-body data only. Bridging the existent gap between these two frameworks will be essential since it may allow to improve our understanding on the diverse phenomenology observed in nuclei. Examples on observations from astrophysical objects and processes sensitive to the nuclear EoS are also briefly discussed. As the main conclusion, the isospin dependence of the nuclear EoS around saturation density and, to a lesser extent, the nuclear matter incompressibility remain to be accurately determined. Experimental and theoretical efforts in finding and measuring observables specially sensitive to the EoS properties are of paramount importance, not only for low-energy nuclear physics but also for nuclear astrophysics applications. 7 The expression introduced by Migdal in Ref. [43] neglected the term in a AS . 8 From a macroscopic picture it would correspond to an isotropic compression. 9 From a macroscopic picture it would correspond to a non-isotropic compression. 15

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Section: Gamow-teller Resonancementioning

confidence: 99%

Nuclear equation of state from ground and collective excited state properties of nuclei

Roca-Maza

Paar

2018

Progress in Particle and Nuclear Physics

194

110

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“…In the right panel, the np pairing effects are shown to push the distribution to the higher energy region even without the deformation. Contrary to the p-h repulsive force, the np pairing is mainly attractive, by which the Fermi energy difference of protons and neutrons is reduced by its attractive interaction and, consequently, gives rise to the high-lying GT transition between more deeply bound neutrons and protons SPSs [22]. As a result, the two peaks and their magnitudes appear explicitly by the np pairing.…”

Section: Resultsmentioning

confidence: 99%

Neutron--Proton Pairing Correlations and Deformation for $N = Z$ Nuclei in $sd$- and $pf$-shell by Deformed BCS and Deformed QRPA

Ha¹,

Cheoun²,

Sagawa³

2019

Acta Phys. Pol. B

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We investigate neutron-proton (np) pairing correlation effect on the shell evolution of ground-state energies along with the deformation for N = Z nuclei in sd-and pf-shell, such as 24 Mg and 72 Kr. We start from a simple shell-filling model constructed by a deformed Woods-Saxon potential characterized as β 2 deformation, and then we include all kinds of pairing correlations in the residual interaction. In this work, like-and unlike-pairing correlation decomposed as isoscalar (IS) T = 0 and isovector (IV) T = 1 component are explicitly taken into account to estimate the ground-state energies. It turns out that the IS condensation can explain the oblate deformation for 72 Kr. We also test those effects on the Gamow-Teller (GT) transition for another N = Z nucleus, 56 Ni, which explicitly exhibits the effects by the IS condensation and the deformation.

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“…As it has been emphasized in Ref. [9], recent interest in the GTR studies is motivated by its importance for understanding the spin and spin-isospin dependence of modern effective interactions [10][11][12][13][14][15][16][17], nuclear beta decay [18][19][20][21][22][23][24][25][26], beta delayed neutron emission [27], as well as double beta decay [28][29][30][31][32][33][34][35][36]. In addition, accurate description of GT ± transitions, including both in stable and exotic nuclei, is relevant for the description of a variety of astrophysically relevant weak interaction processes [37][38][39][40][41], electron capture in presupernova stars [42][43][44], r-process [45,46] and neutrino-nucleus interaction of relevance for neutrino detectors and neutrino nucleosynthesis in stellar environment [47][48][49][50][51][52]…”

Section: Introductionmentioning

confidence: 99%

Nuclear charge-exchange excitations based on relativistic density-dependent point-coupling model

Vale,

Niu,

Paar

2020

Preprint

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Spin-isospin transitions in nuclei away from the valley of stability are essential for the description of astrophysically relevant weak interaction processes. While they remain mainly beyond the reach of experiment, theoretical modeling provides important insight into their properties. In order to describe the spin-isospin response, the proton-neutron relativistic quasiparticle random phase approximation (PN-RQRPA) is formulated using the relativistic density-dependent point coupling interaction, and separable pairing interaction in both the T = 1 and T = 0 pairing channels. By implementing recently established DD-PCX interaction with improved isovector properties relevant for the description of nuclei with neutron-to-proton number asymmetry, the isobaric analog resonances (IAR) and Gamow-Teller resonances (GTR) have been investigated.In contrast to other models that usually underestimate the IAR excitation energies in Sn isotope chain, the present model accurately reproduces the experimental data, while the GTR properties depend on the isoscalar pairing interaction strength. This framework provides not only an improved description of the spin-isospin response in nuclei, but it also allows future large scale calculations of charge-exchange excitations and weak interaction processes in stellar environment.

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A study of Gamow-Teller transitions for N = Z nuclei, 24Mg, 28Si, and 32S, by a deformed QRPA

Cited by 15 publications

References 46 publications

Nuclear equation of state from ground and collective excited state properties of nuclei

Nuclear equation of state from ground and collective excited state properties of nuclei

Neutron--Proton Pairing Correlations and Deformation for $N = Z$ Nuclei in $sd$- and $pf$-shell by Deformed BCS and Deformed QRPA

Nuclear charge-exchange excitations based on relativistic density-dependent point-coupling model

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