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Suzuki, Y.; Hara, Shigehiro

doi:10.1103/physrevc.39.658

Cited by 22 publications

(21 citation statements)

References 29 publications

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“…This is not surprising since the overlaps between the two bases for the low-lying states of p and sd-shell nuclei have been found to be comparatively large in the low-N Ω subspaces [212]. This approach has been further applied to study the monopole and quadrupole strengths in light nuclei [214,215]. It has been also applied to the α+ 12 C cluster system and found to contain the important shell-model configurations needed to describe low-lying spectrum of 16 O [216,217].…”

Section: Cluster Modelmentioning

confidence: 99%

Symmetry-guided large-scale shell-model theory

Launey

Dytrych

Draayer

2016

Progress in Particle and Nuclear Physics

127

173

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In this review, we present a symmetry-guided strategy that utilizes exact as well as partial symmetries for enabling a deeper understanding of and advancing ab initio studies for determining the microscopic structure of atomic nuclei. These symmetries expose physically relevant degrees of freedom that, for large-scale calculations with QCD-inspired interactions, allow the model space size to be reduced through a very structured selection of the basis states to physically relevant subspaces. This can guide explorations of simple patterns in nuclei and how they emerge from first principles, as well as extensions of the theory beyond current limitations toward heavier nuclei and larger model spaces. This is illustrated for the ab initio symmetry-adapted no-core shell model (SA-NCSM) and two significant underlying symmetries, the symplectic Sp(3, R) group and its deformation-related SU(3) subgroup. We review the broad scope of nuclei, where these symmetries have been found to play a key role -from the light p-shell systems, such as 6 Li, 8 B, 8 Be, 12 C, and 16 O, and sd-shell nuclei exemplified by 20 Ne, based on first-principle explorations; through the Hoyle state in 12 C and enhanced collectivity in intermediate-mass nuclei, within a no-core shell-model perspective; up to strongly deformed species of the rare-earth and actinide regions, as investigated in earlier studies. A complementary picture, driven by symmetries dual to Sp(3, R), is also discussed. We briefly review symmetry-guided techniques that prove useful in various nuclear-theory models, such as Elliott model, ab initio SA-NCSM, symplectic model, pseudo-SU(3) and pseudo-symplectic models, ab initio hyperspherical harmonics method, ab initio lattice effective field theory, exact pairing -plusshell model approaches, and cluster models, including the resonating-group method. Important implications of these approaches that have deepened our understanding of emergent phenomena in nuclei, such as enhanced collectivity, giant resonances, pairing, halo, and clustering, are discussed, with a focus on emergent patterns in the framework of the ab initio SA-NCSM with no a priori assumptions.

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Section: Cluster Modelmentioning

confidence: 99%

Symmetry-guided large-scale shell-model theory

Launey

Dytrych

Draayer

2016

Progress in Particle and Nuclear Physics

127

173

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“…These considerations motivate us to develop and investigate a novel model, the ab initio symmetry-adapted no-core shell model (SA-NCSM) [18], which, by taking advantage of symmetries inherent to the nuclear dy- * Corresponding author:dytrych@ujf.cas.cz namics [19][20][21][22], can provide access to heavier nuclei and larger model spaces essential to accommodate collective, deformed, and cluster substructures [22][23][24][25][26][27][28][29][30][31][32]. This is achieved by recognizing that the choice of a basis is crucial and that the SA-NCSM affords a solution that is a linear combination of a limited number of basis states of definite nuclear deformation.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of the SU(3) scheme for ab initio large-scale calculations beyond the lightest nuclei

Dytrych

Maris

Launey

et al. 2016

Computer Physics Communications

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We report on the computational characteristics of ab initio nuclear structure calculations in a symmetry-adapted no-core shell model (SA-NCSM) framework. We examine the computational complexity of the current implementation of the SA-NCSM approach, dubbed LSU3shell, by analyzing ab initio results for 6 Li and 12 C in large harmonic oscillator model spaces and SU(3)-selected subspaces. We demonstrate LSU3shell's strong-scaling properties achieved with highly-parallel methods for computing the many-body matrix elements. Results compare favorably with complete model space calculations and significant memory savings are achieved in physically important applications. In particular, a well-chosen symmetry-adapted basis affords memory savings in calculations of states with a fixed total angular momentum in large model spaces while exactly preserving translational invariance.

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“…For light stable nuclei, low-energy IS strengths can be good probes also for cluster states [24][25][26][27][28][29][30][31][32][33][34][35][36]. As discussed by Yamada et al [29] and Chiba et al [35], cluster states can be strongly excited by IS compressive modes such as IS monopole (ISM) and ISD modes.…”

Section: Introductionmentioning

confidence: 99%

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

Kanada-En’yo

Shikata

2017

Phys. Rev. C

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We studied dipole excitations in 10 Be based on an extended version of the antisymmetrized molecular dynamics, which can describe 1p-1h excitations and large amplitude cluster modes. Toroidal and compressive dipole operators are found to be good proves to separate the low-energy and highenergy parts of the isoscalar dipole excitations, respectively. Two low-energy 1 − states, the toroidal dominant 1 − 1 state at E ∼ 8 MeV and the E1 dominant 1 − 2 state at E ∼ 16 MeV, were obtained. By analysis of transition current densities, the 1 − 1 states is understood as a toroidal dipole mode with exotic toroidal neutron flow caused by rotation of a deformed 6 He cluster, whereas the 1 − 2 state is regarded as a neutron-skin oscillation mode, which are characterized by surface neutron flow with inner isoscalar flow caused by the surface neutron oscillation against the 2α core.

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Isoscalar monopole and quadrupole strength ofO16in an α+12

Cited by 22 publications

References 29 publications

Symmetry-guided large-scale shell-model theory

Symmetry-guided large-scale shell-model theory

Efficacy of the SU(3) scheme for ab initio large-scale calculations beyond the lightest nuclei

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

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