Role of residual interaction in the relativistic description of M1 excitation

Oishi, T.; Kružić, Goran; Paar, Nils

doi:10.1088/1361-6471/abaeb1

Cited by 17 publications

(41 citation statements)

References 68 publications

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Section: Magnetic Dipole Transitions In the Relativistic Quasiparticle Random Phase Approximationmentioning

confidence: 99%

“…In further studies of open shell nuclei, it is shown that pairing correlations have a significant impact on the centroid energy and major peak position of the M1 mode [21,22]. From the analysis of M1 mode in the Ca isotope chain, the role of the isovector-pseudovector (IV-PV) residual interaction has been discussed [22]. It has been shown that the experimental data on M1 mode could improve and optimize the theoretical aspects to describe the residual interactions in the RQRPA.…”

Section: Magnetic Dipole Transitions In the Relativistic Quasiparticle Random Phase Approximationmentioning

confidence: 99%

“…Clearly, further theoretical studies of M1 transitions are required to resolve open questions on their properties. To respond to some of the open challenges, recently a novel theory framework has been established for studies of M1 excitations, based on the relativistic nuclear energy density functional [21,22]. This framework has been employed in several studies, including the analysis of basic M1 properties, their isotopic dependence and relationship with spinorbit interaction, the role of pairing properties, constraining the quenching of the g factors for the free nucleons, and others.…”

Section: Introductionmentioning

confidence: 99%

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Nuclear magnetic transitions in the relativistic energy density functional approach

Paar

Kružić²,

Oishi

2021

EPJ Web Conf.

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Recently a novel theory framework has been established for description of magnetic dipole (M1) transitions in finite nuclei, based on relativistic nuclear energy density functional with point coupling interactions. The properties of M1 transitions have been studied, including the sum rules, spin, orbital, isoscalar and isovector M1 transition strengths in magic and open shell nuclei. It is shown that pairing correlations and spinorbit interaction plays an important role in the description of M1 transition strength distributions. The analysis of the evolution of M1 transition properties in the isotope chain 100-140 Sn shows the interplay between single and double-peak structures, determined by the evolution of single-particle states, their occupations governed by the pairing correlations, and two-quasiparticle transitions involved. Comparison of the calculated B(M1) transition strength with recent data from inelastic proton scattering on 112-124 Sn, shows that quenching of the g factors geff/gfree =0.80-0.93 is required to reproduce the experimental data. Further experimental investigations are needed to determine accurately the quenching factor.

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Section: Magnetic Dipole Transitions In the Relativistic Quasiparticle Random Phase Approximationmentioning

confidence: 99%

Section: Magnetic Dipole Transitions In the Relativistic Quasiparticle Random Phase Approximationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nuclear magnetic transitions in the relativistic energy density functional approach

Paar

Kružić²,

Oishi

2021

EPJ Web Conf.

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“…[2,3,[7][8][9][10]. For example, in studies based on the Skyrme energy-density functional (EDF) [11][12][13][14][15] as well as on the relativistic EDF [16,17], the interplay between the SO splittings and the residual interactions has been investigated. In addition, the M1 transition is sensitive to the pairing correlations in open-shell nuclei [17,18].…”

Section: Introductionmentioning

confidence: 99%

“…For example, in studies based on the Skyrme energy-density functional (EDF) [11][12][13][14][15] as well as on the relativistic EDF [16,17], the interplay between the SO splittings and the residual interactions has been investigated. In addition, the M1 transition is sensitive to the pairing correlations in open-shell nuclei [17,18]. Note that, although the concept of M1 transition originates in the electo-magnetic interaction, this transition can be invoked also by strong-interaction probes [9,[19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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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Evolution of magnetic dipole strength in Sn100−140 isotope chain and the quenching of nucleon g factors

2021

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The evolution of electromagnetic transitions along isotope chains is of particular importance for the nuclear structure and dynamics, as well as for the r-process nucleosynthesis. Recent measurement of inelastic proton scattering on even-even 112−124 Sn isotopes provides a novel insight into the isotopic dependence of E1 and M1 strength distributions. We investigate M1 transitions in eveneven 100−140 Sn isotopes from a theoretical perspective, based on relativistic nuclear energy density functional. The M1 transition strength distribution is characterized by an interplay between single and double-peak structures, that can be understood from the evolution of single-particle states, their occupations governed by the pairing correlations, and two-quasiparticle transitions involved. It is shown that discrepancy between model calculations and experiment on B(M1) transition strength is considerably reduced than previously known, and the quenching of the g-factors for the free nucleons needed to reproduce the experimental data on M1 transition strength amounts g ef f /g f ree =0.80-0.93. Since some of the B(M1) strength above the neutron threshold may be missing in the inelastic proton scattering measurement, further experimental studies are required to confirm if only small modifications of the bare g-factors are actually needed when applied in finite nuclei.

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Role of residual interaction in the relativistic description of M1 excitation

Cited by 17 publications

References 68 publications

Nuclear magnetic transitions in the relativistic energy density functional approach

Nuclear magnetic transitions in the relativistic energy density functional approach

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

Evolution of magnetic dipole strength in Sn100−140 isotope chain and the quenching of nucleon g factors

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