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

Vale, Deni; Niu, Y.; Paar, Nils

doi:10.1103/physrevc.103.064307

Cited by 19 publications

(24 citation statements)

References 120 publications

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“…For all three nuclei shown in Fig. 1, the non-perturbed IV-spin-M1 strength is equal to the higher-energy GT(−) strength: R M1 ∼ = R GT(−) (E x ) with E x = 13, 6.6, and 8.5 MeV in 16 O, 42 Ca, and 48 Ca, respectively. By analyzing the transition components, this equivalence can be explained from the identical set of quasi-particle transitions.…”

Section: A Non-perturbed Responsementioning

confidence: 91%

“…That is, ν(1d 5/2 ) −→ ν(1d 3/2 ) in IV M1, and ν(1d 5/2 ) −→ π(1d 3/2 ) in GT(−), for 18 O, where the symbol π (ν) indicates the proton (neutron) state. Similarly for 42,48 Ca,…”

Section: A Non-perturbed Responsementioning

confidence: 95%

“…In Fig. 1, the non-perturbed response functions for GT and M1 modes obtained with the DD-PC1 interaction are displayed for 18 O, 42 Ca, and 48 Ca. Since their operators introduced in Eq.…”

Section: A Non-perturbed Responsementioning

confidence: 99%

“…In Fig. 2, the M1 and GT distributions are presented for 48 Ca and 208 Pb, by using the DD-PC1 and DD-PCX interactions combined with the IV-PV interaction term with the coupling constant, α IV−PV . Notice that the pairing correlations vanish in these systems, and thus, only the effect of IV-PV coupling is seen [16].…”

Section: B Iv-pv Residual Interactionmentioning

confidence: 99%

“…However, it is well known that both types of excitation are remarkably affected by so-called residual interactions [17,35,36,38,39,46]. In open-shell nuclei, the effect of isoscalar and isovector pairing correlations has been shown as relevant [40,45,47,48]. The isobaric-analog symmetry between the GT and M1 transition properties in real systems has not been completely clarified.…”

Section: Introductionmentioning

confidence: 99%

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Symmetry breaking of Gamow-Teller and magnetic-dipole transitions and its restoration in calcium isotopes

Oishi,

Ravlic,

Paar

2022

Preprint

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Nuclear magnetic-dipole (M1) and Gamow-Teller (GT) transitions provide insight into the spinisospin properties of atomic nuclei. By considering them as unified spin-isospin transitions, the M1/GT transition strengths and excitation energies are subject to isobaric-analog symmetry. The excitation properties associated to the M1/GT symmetry need to be clarified within consistent theoretical approach. In this work, the relationship between the M1 and GT transitions in Ca isotopes is investigated in a unified framework based on the relativistic energy-density functional (REDF) with point-coupling interactions, using the relativistic quasi-particle random-phase approximation (RQRPA). It is shown that the isovector-pseudovector (IV-PV) residual interaction affects these transitions. The symmetry of M1 and giant-GT transitions can be disrupted by this interaction in closed-shell nuclei. In open-shell Ca isotopes, the proton-neutron pairing in the residual RQRPA interaction also plays a role in GT transitions. Due to the interplay between these interactions, the M1/GT symmetry can be restored especially in the 42 Ca nucleus, i.e., the giant-GT strength can become comparable to that of the M1 mode in terms of the unified spin-isospin transitions by fixing the PN-pairing strength so as to reproduce the experimental low-lying GT-excitation energies. The mirror symmetry of both M1 and GT transitions is also demonstrated for open-shell mirror partners, 42 Ca and 42 Ti. Further improvements are required to achieve more accurate simultaneous reproduction of M1 and GT-transition energies in the REDF framework.

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Section: A Non-perturbed Responsementioning

confidence: 91%

Section: A Non-perturbed Responsementioning

confidence: 95%

“…In Fig. 1, the non-perturbed response functions for GT and M1 modes obtained with the DD-PC1 interaction are displayed for 18 O, 42 Ca, and 48 Ca. Since their operators introduced in Eq.…”

Section: A Non-perturbed Responsementioning

confidence: 99%

Section: B Iv-pv Residual Interactionmentioning

confidence: 99%