Effect of pairing on nuclear dynamic

Scamps, Guillaume; Lacroix, Denis

doi:10.22323/1.184.0048

Cited by 3 publications

(5 citation statements)

References 12 publications

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“…SkI4 reproduces the width, but has a lot of missing strength, whereas SLy4 and NRAPR reproduce the central strength around 15 to 20 MeV with a degree of success, but the calculated widths are far too narrow. We comment that the use of time-dependent pairing may widen the response function and shift the peak positions [67,88]. Additionally, inclusion of beyond mean-field effects may also significantly alter the calculated response [89].…”

Section: Electric Dipole Response In the Time-dependent Hartree-fock ...mentioning

confidence: 99%

Dipole response of76Se above 4 MeV

et al. 2013

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The dipole response of 76 34 Se in the energy range from 4 to 9 MeV has been analyzed using a ( γ, γ ) polarized photon scattering technique, performed at the High Intensity γ-Ray Source facility, to complement previous work performed using unpolarized photons. The results of this work offer both an enhanced sensitivity scan of the dipole response and an unambiguous determination of the parities of the observed J = 1 states. The dipole response is found to be dominated by E1 excitations, and can reasonably be attributed to a pygmy dipole resonance. Evidence is presented to suggest that a significant amount of directly unobserved excitation strength is present in the region, due to unobserved branching transitions in the decays of resonantly excited states. The dipole response of the region is underestimated when considering only ground state decay branches. We investigate the electric dipole response theoretically, performing calculations in a 3D cartesianbasis time-dependent Skyrme-Hartree-Fock framework.

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Section: Electric Dipole Response In the Time-dependent Hartree-fock ...mentioning

confidence: 99%

Dipole response of76Se above 4 MeV

et al. 2013

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“…This discrepancy could be attributed to the rotational mode caused by deformation of the ground band as reported by experiments [9,21]. It is also noted the linear response method occasionally underestimates the observed B(E2) as reported by Scamps and Lacroix [35] which could be another reason of the disagreement in 44 S and 42 Si.…”

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confidence: 82%

“…In this paper, we report the low-lying quadrupole excitation modes in 46 Ar, 44 S and 42 Si generated by the strong quadrupole correlation between protons and neutrons. To access the low-lying quadrupole modes of these isotopes, we apply the Canonical-basis timedependent Hartree-Fock-Bogoliubov (Cb-TDHFB) theory [33] which has been successfully applied to the study of the dipole [33,34] and quadrupole [35] resonances of nuclei of wide mass range. The Cb-TDHFB can describe self-consistently the dynamical effects of pairing correlation which has a significant role to generate the low-lying quadrupole strength as reported in Ref.…”

Section: Introductionmentioning

confidence: 99%

Low-lying 2$^+$ states generated by $pn$-quadrupole correlation and $N=28$ shell quenching

Ebata,

Kimura

2014

Preprint

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The quadrupole vibrational modes of neutron-rich N =28 isotones ( 48 Ca, 46 Ar, 44 S and 42 Si) are investigated using the canonical-basis time-dependent Hartree-Fock-Bogoliubov theory with several choice of energy density functionals, including nuclear pairing correlation. It is found that the quenching of N =28 shell gap and the proton holes in the sd-shell trigger quadrupole correlation and increase the collectivity of the low-lying 2 + state in 46 Ar. It is also found that the pairing correlation plays an important role to increase the collectivity. We also demonstrate that the same mechanism to enhance the low-lying collectivity applies to other N =28 isotones 44 S and 42 Si, and it generates a couple of low-lying 2 + states which can be associated with the observed 2 + states.

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“…To access the E2 modes, we use the canonical-basis time-dependent Hartree-Fock-Bogoliubov (Cb-TDHFB) theory [4] which can be successfully applied to the study of the dipole and quadrupole modes of even-even isotopes [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…We investigate the low-lying quadrupole excitation (E2) modes in 46 Ar, 44 S and 42 Si generated by the strong quadrupole correlation between protons and neutrons. To access the E2 modes, we apply the canonical-basis time-dependent Hartree-Fock-Bogoliubov (Cb-TDHFB) theory [4] which can be successfully applied to the study of the dipole and quadrupole modes of even-even isotopes [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Quenching of N = 28 Shell Gap and a Low-Lying Quadrupole Mode in the Vicinity of Neutron-Rich N = 28 Isotones

Ebata

Kimura

2015

Proceedings of the Conference on Advances in Radioactive Isotope Science (ARIS2014)

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We investigate the low-lying 2 + states of N = 28 isotones ( 48 Ca, 46 Ar, 44 S and 42 Si) with using the canonical-basis time-dependent Hartree-Fock-Bogoliubov theory in which the pairing is taken into account self-consistently. The quadrupole mode with very small excitation energies emerges in 46 IntroductionThe low-energy excited modes are quite sensitive to the underlying shell structure and the pairing correlations, and hence, the quenched magic shell gaps of unstable nuclei should generate unique collective modes. One of the interesting example is the N=28 shell gap that is known to be quenched in the vicinity of 44 S, and has been paid considerable experimental [1] and theoretical attention [2].Since there is a ∆l=2 difference of orbital angular momentum between f 7/2 and p 3/2 states, the quench of N=28 shell gap will induce the strong quadrupole correlation in the low-lying state. Furthermore, the protons in Si, S and Ar isotopes occupy the middle of the sd-shell, and hence, the strong quadrupole correlation should also exist in the proton side. Therefore, when the N=28 shell gap is quenched, the strong quadrupole correlations among protons and neutrons will be ignited and can be expected to lead to a variety of the excitation modes. Indeed, various exotic phenomena such as the shape transition in Si and S isotopes and the shape coexistence are theoretically suggested [3].We investigate the low-lying quadrupole excitation (E2) modes in 46 Ar, 44 S and 42 Si generated by the strong quadrupole correlation between protons and neutrons. To access the E2 modes, we use the canonical-basis time-dependent Hartree-Fock-Bogoliubov (Cb-TDHFB) theory [4] which can be successfully applied to the study of the dipole and quadrupole modes of even-even isotopes [4][5][6].

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Effect of pairing on nuclear dynamic

Cited by 3 publications

References 12 publications

Dipole response of76Se above 4 MeV

Dipole response of76Se above 4 MeV

Low-lying 2$^+$ states generated by $pn$-quadrupole correlation and $N=28$ shell quenching

Quenching of N = 28 Shell Gap and a Low-Lying Quadrupole Mode in the Vicinity of Neutron-Rich N = 28 Isotones

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