Toroidal, compressive, and 
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 properties of low-energy dipole modes in 
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Kanada-En’yo, Yoshiko; Shikata, Yuki

doi:10.1103/physrevc.95.064319

Cited by 23 publications

(29 citation statements)

References 65 publications

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“…∞ 0 dr r 2 ρ tr p + ρ tr n . The IS1 transitions have recently been intensively discussed because it has of particular importance to study the cluster structure (See recent theoretical and experimental papers [14,46,47] and references therein). Figure 10 plots the IS1 strength distributions as a function of the excitation energies.…”

Section: E Isoscalar Dipole Transitionsmentioning

confidence: 99%

Emergence of nuclear clustering in electric-dipole excitations ofLi6

Satsuka

Horiuchi

2019

Phys. Rev. C

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Nuclear clustering plays an important role, especially in the dynamics of light nuclei. The importance of the emergence of the nuclear clustering was discussed in the recent measurement of the photoabsorption cross sections as it offered the possibility of the coexistence of various excitation modes which are closely related to the nuclear clustering. To understand the excitation mechanism, we study the electric-dipole (E1) responses of 6 Li with a fully microscopic six-body calculation. The ground-state wave function is accurately described with a superposition of correlated Gaussian (CG) functions with the aid of the stochastic variational method. The final-state wave functions are also expressed by a number of the CG functions including important configurations to describe the six-body continuum states excited by the E1 field. We found that the out-of-phase transitions occur due to the oscillations of the valence nucleons against the 4 He cluster at the low energies around 10 MeV indicating "soft" giant-dipole-resonance(GDR)-type excitations, which are very unique in the 6 Li system but could be found in other nuclear systems. At the high energies beyond ∼ 30 MeV typical GDR-type transitions occur. The 3 He-3 H clustering plays an important role to the GDR phenomena in the intermediate energy regions around 20 MeV.

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Section: E Isoscalar Dipole Transitionsmentioning

confidence: 99%

Emergence of nuclear clustering in electric-dipole excitations ofLi6

Satsuka

Horiuchi

2019

Phys. Rev. C

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“…Using the dipole operators we analyze the toroidal nature of the dipole excitations in the same matter as done in Ref. [33], which discussed dipole excitations of 10 Be. The detailed definition of j(r) as well as that of the density operator ρ(r) is explained in appendix of Ref.…”

Section: Isd Operators and Transition Strengthsmentioning

confidence: 99%

“…[33]. In the case of 10 Be, the system is approximately understood by the 6 He+α clustering, and the TD dominant dipole excitation in the 1 − 1 state is described by rotation of the 6 He cluster.…”

Section: B Intrinsic Structuresmentioning

confidence: 99%

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Cluster and toroidal aspects of isoscalar dipole excitations in C12

2018

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We investigated cluster and toroidal aspects of isoscalar dipole excitations in 12 C based on the shifted basis antisymmetrized molecular dynamics combined with the generator coordinate method, which can describes 1p-1h excitations and 3α dynamics. In the E = 10 − 15 MeV region, we found two low-energy dipole modes separating from the giant dipole resonance. One is the developed 3α-cluster state and the other is the toroidal dipole mode. The cluster state is characterized by the large amplitude cluster motion beyond the 1p-1h model space, whereas the toroidal dipole mode is predominantly described by 1p-1h excitations on the ground state. The low-energy dipole states are remarkably excited by the toroidal dipole operator, which can measure the nuclear vorticity. For compressive dipole transition strengths, a major part is distributed in the 30 − 50 MeV region for the giant dipole resonance, and 5% of the total energy weighted sum exist in the E < 20 MeV region.

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“…Folowing our recent study of 208 Pb [1], the usual interpretation of pygmy E1 mode [2] can be questioned in favor of isoscalar toroidal mode. Besides, there are predictions that low-lying 1 − states in light nuclei 10 Be [3], 24 Mg [4], 20 Ne [5] have mainly vortical character ( Fig. 1).…”

Section: Introductionmentioning

confidence: 98%

Toroidal Modes in Nuclei by Inelastic Electron Scattering

Repko¹,

Kvasil²

2019

Acta Phys. Pol. B Proc. Suppl.

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Electron scattering is a tool that can provide relatively clean view of the nuclear structure in both ground and excited states, as it depends on the well-known electromagnetic interaction. But since the common expressions for its cross section were derived with certain assumptions, in this paper we describe several nontrivial steps necessary for a proper theoretical calculation within the current density-functional framework, namely with Skyrme QRPA for axial nuclei, with aim to enable comparison of the theoretically predicted low-lying 1 − toroidal modes with future (e, e ) experiments.

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Toroidal, compressive, and E1 properties of low-energy dipole modes in Be10

Cited by 23 publications

References 65 publications

Emergence of nuclear clustering in electric-dipole excitations ofLi6

Emergence of nuclear clustering in electric-dipole excitations ofLi6

Cluster and toroidal aspects of isoscalar dipole excitations in C12

Toroidal Modes in Nuclei by Inelastic Electron Scattering

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