Structure and decay of the pygmy dipole resonance in 
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Kimura, Masaaki

doi:10.1103/physrevc.95.034331

Cited by 18 publications

(15 citation statements)

References 67 publications

(217 reference statements)

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“…One candidate is 24 Mg, where it has been suggested that some peaks of the ISGMR strength are due either to 20 Ne + α, or to 12 C + 12 C vibrations, or even to a more exotic vibration of a pentagon of α clusters (with an additional α lying in the center) [81]. Similar predictions have been made for some of the peaks appearing the ISGDR strength of 20 Ne and 44 Ti [82] (see also [83,84]).…”

Section: Cluster Modelsmentioning

confidence: 67%

The compression-mode giant resonances and nuclear incompressibility

Garg

Colò

2018

Progress in Particle and Nuclear Physics

239

186

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The compression-mode giant resonances, namely the isoscalar giant monopole and isoscalar giant dipole modes, are examples of collective nuclear motion. Their main interest stems from the fact that one hopes to extrapolate from their properties the incompressibility of uniform nuclear matter, which is a key parameter of the nuclear Equation of State (EoS). Our understanding of these issues has undergone two major jumps, one in the late 1970s when the Isoscalar Giant Monopole Resonance (ISGMR) was experimentally identified, and another around the turn of the millennium since when theory has been able to start giving reliable error bars to the incompressibility. However, mainly magic nuclei have been involved in the deduction of the incompressibility from the vibrations of finite nuclei.The present review deals with the developments beyond all this. Experimental techniques have been improved, and new open-shell, and deformed, nuclei have been investigated. The associated changes in our understanding of the problem of the nuclear incompressibility are discussed. New theoretical models, decay measurements, and the search for the evolution of compressional modes in exotic nuclei are also discussed.

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Section: Cluster Modelsmentioning

confidence: 67%

The compression-mode giant resonances and nuclear incompressibility

Garg

Colò

2018

Progress in Particle and Nuclear Physics

239

186

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“…Main interest are properties of the IS LED modes such as the cluster and vortical aspects. For this aim, we apply the method of the shifted basis AMD (sAMD) [43][44][45] combined with the cluster generator coordinate method (GCM). The sAMD+GCM has been recently constructed to describe both the single-particle excitation and large amplitude cluster mode.…”

Section: Introductionmentioning

confidence: 99%

Isoscalar dipole excitations inO16

Kanada-En’yo

Shikata

2019

Phys. Rev. C

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Isoscalar (IS) monopole and dipole excitations in 16 O were investigated by the method of shifted basis antisymmetrized molecular dynamics combined with the generator coordinate method. Significant strengths of the IS monopole and dipole transitions were obtained in the low-energy region below the giant resonances. In addition to the compressive mode, which mainly contributes to the high-energy strengths for the IS dipole giant resonance, we obtained a variety of low-energy dipole modes such as the vortical dipole mode in the 1 − 1 state of the vibrating tetrahedral 4α and the 12 C+α cluster structure in the 1 − 2 state. The 1 − 1 state contributes to the significant low-energy strength of the IS dipole transition as 5% of the energy-weighted sum rule, which describes well the experimental data observed by the α inelastic scattering.

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“…[1][2][3][4][5][6][7][8][9] and Refs. [10,11] for review articles) and their complex nature has been extensively discussed and interpreted in terms of oscillations of a neutron skin against a core, mixing of isoscalar and isovector nature, coupling with a toroidal motion, single-particle versus collective behavior, deformation effects (see for instance some recent publications [12][13][14][15][16][17][18][19][20][21][22][23]). Experimental evidence on the existence of low-energy excitations related to a neutron excess was also reported in Refs.…”

Section: Introductionmentioning

confidence: 99%

Soft breathing modes in neutron-rich nuclei with the subtracted second random-phase approximation

2019

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We analyze the isoscalar response related to breathing modes with particular attention being paid to low-lying excitations in neutron-rich nuclei. We use the subtracted second random-phase approximation (SSRPA) to describe microscopically the response. By increasing the neutron excess, we study the evolution of the response in Ca isotopes going from 40 Ca to 48 Ca and to 60 Ca as well as in N = 20 isotones going from 40 Ca to 36 S and to 34 Si. Finally, the case of 68 Ni is investigated. We predict soft monopole modes in neutron-rich nuclei which are driven by neutron excitations. At variance with dipole pygmy modes, these neutron excitations are not only strongly dominant at the surface of the nucleus but over its entire volume. The effect of the mixing with two particle-two hole configurations induced by the SSRPA model is analyzed. The properties of such soft neutron modes are investigated in terms of their excitation energies, transition densities and wave-function components. Their collectivity is also discussed as a function of the isospin asymmetry and of the mass of the nucleus. The link between such low-energy compression modes and a compressibility modulus introduced for neutron-rich infinite matter is finally studied.

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Structure and decay of the pygmy dipole resonance in Ne26

Cited by 18 publications

References 67 publications

The compression-mode giant resonances and nuclear incompressibility

The compression-mode giant resonances and nuclear incompressibility

Isoscalar dipole excitations inO16

Soft breathing modes in neutron-rich nuclei with the subtracted second random-phase approximation

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