Clustering in structure and reactions using configuration interaction techniques

Kravvaris, Konstantinos; Volya, Alexander

doi:10.1103/physrevc.100.034321

Cited by 22 publications

(24 citation statements)

References 104 publications

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“…For light nuclei, there has been recent progress in ab initio descriptions of α-cluster systems including the GFMC method, with applications to the α-cluster structure of 8 Be and 12 C, along with electromagnetic transitions (103); the nuclear lattice EFT, with applications to the Hoyle state energy and the astrophysically relevant α-α scattering problem (35,119,120); and the HH method, with applications to GR modes in 4 He (121). Of particular note are recent developments that combine RGM with configurationinteraction methods (70,122), as well as with ab initio NCSM and SA-NCSM (34,42,83; see Section 4.2.1). Reference 123 provides a review of cluster models, including some of the earliest techniques that treat particles within localized clusters, such as RGM (44,124) and the related generator coordinate method (125), as well as molecular dynamics approaches (126,127).…”

Section: α-Induced Reactionsmentioning

confidence: 99%

Nuclear Dynamics and Reactions in the Ab Initio Symmetry-Adapted Framework

Launey

Mercenne

Dytrych

2021

Annu. Rev. Nucl. Part. Sci.

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We review the ab initio symmetry-adapted (SA) framework for determining the structure of stable and unstable nuclei, along with related electroweak, decay, and reaction processes. This framework utilizes the dominant symmetry of nuclear dynamics, the shape-related symplectic SP(3,ℝ) symmetry, which has been shown to emerge from first principles and to expose dominant degrees of freedom that are collective in nature, even in the lightest species or seemingly spherical states. This feature is illustrated for a broad scope of nuclei ranging from helium to titanium isotopes, enabled by recent developments of the ab initio SA no-core shell model expanded to the continuum through the use of the SA basis and that of the resonating group method. The review focuses on energies, electromagnetic transitions, quadrupole and magnetic moments, radii, form factors, and response function moments for ground-state rotational bands and giant resonances. The method also determines the structure of reaction fragments that is used to calculate decay widths and α-capture reactions for simulated X-ray burst abundance patterns, as well as nucleon–nucleus interactions for cross sections and other reaction observables. Expected final online publication date for the Annual Review of Nuclear and Particle Science, Volume 71 is September 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Section: α-Induced Reactionsmentioning

confidence: 99%

Nuclear Dynamics and Reactions in the Ab Initio Symmetry-Adapted Framework

Launey

Mercenne

Dytrych

2021

Annu. Rev. Nucl. Part. Sci.

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“…Hypothesis of a 6 + state with parameters from microscopic calculations [24] Resonating Group Method (RGM) and no-core shell model (NCSM) approach, described in detail in Ref. [25], was used in [24] to calculate the α spectroscopic factors for the states in 10 Be. The α spectroscopic factors for the yrast 6 + state in 10 Be, that appears at 13.5 MeV in these calculations, are 0.1 and 0.66 for the elastic and inelastic channels respectively.…”

Section: Discussionmentioning

confidence: 99%

Search for the high-spin members of the α:2n:α band in Be10

et al. 2020

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Background Clustering plays an important role in the structure of 10 Be. Exotic molecular-like configurations, such as α:2n:α, have been suggested at relatively low excitation energies.Purpose To search for the high-spin states that may belong to the molecular-like α:2n:α configuration in 10 Be.Method Measuring excitation functions for 6 He+α scattering, populating states in the excitation energy range from 4.5 MeV to 8 MeV in 10 Be using a 6 He rare-isotope beam and a thick helium gas target.Results No new excited states in 10 Be have been observed. Stringent limitation on the possible degree of α-clustering of the hypothetical yrast 6 + state has been obtained. ConclusionsThe high-spin members of the α:2n:α molecular-like rotational band configuration, that is considered to have a 0 + bandhead at 6.18 MeV, either do not exist or have small overlap with the 6 He(g.s.)+α channel.

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“…For light nuclei, there has been recent progress in ab initio descriptions of alpha cluster systems, including the Green's function Monte Carlo method with applications to the α-cluster structure of 8 Be and 12 C, along with electromagnetic transitions (104); the nuclear lattice effective field theory with applications to the Hoyle state energy and the astrophysically relevant α-α scattering problem (120,121,35); and the hyperspherical harmonics method, with applications to giant resonance modes in 4 He (122). Of particular note are recent developments that combine RGM with configuration-interaction methods (123,71), as well as with ab initio no-core shell model and SA-NCSM (34,84,42) (cf. Sec.…”

Section: Alpha-induced Reactionsmentioning

confidence: 99%

Nuclear Dynamics and Reactions in the Ab Initio Symmetry-Adapted Framework

Launey,

Mercenne,

Dytrych

2021

Preprint

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We review the ab initio symmetry-adapted (SA) framework for determining the structure of stable and unstable nuclei, along with related electroweak, decay and reaction processes. This framework utilizes the dominant symmetry of nuclear dynamics, the shape-related symplectic Sp(3, R) symmetry, which has been shown to emerge from first principles and to expose dominant degrees of freedom that are collective in nature, even in the lightest species or seemingly spherical states. This feature is illustrated for a broad scope of nuclei ranging from helium to titanium isotopes, enabled by recent developments of the ab initio symmetry-adapted no-core shell model expanded to the continuum through the use of the SA basis and that of the resonating group method. The review focuses on energies, electromagnetic transitions, quadrupole and magnetic moments, radii, form factors, and response function moments, for ground-state rotational bands and giant resonances. The method also determines the structure of reaction fragments that is used to calculate decay widths and alpha-capture reactions for simulated x-ray burst abundance patterns, as well as nucleon-nucleus interactions for cross sections and other reaction observables.

show abstract

Clustering in structure and reactions using configuration interaction techniques

Cited by 22 publications

References 104 publications

Nuclear Dynamics and Reactions in the Ab Initio Symmetry-Adapted Framework

Nuclear Dynamics and Reactions in the Ab Initio Symmetry-Adapted Framework

Search for the high-spin members of the α:2n:α band in Be10

Nuclear Dynamics and Reactions in the Ab Initio Symmetry-Adapted Framework

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