New Ab Initio Approach to Nuclear Reactions Based on the Symmetry-Adapted No-Core Shell Model

Mercenne, Alexis; Launey, Kristina D.; Escher, Jutta; Dytrych, Tomáš; Draayer, J. P.

doi:10.1007/978-3-030-32357-8_44

Cited by 3 publications

(4 citation statements)

References 9 publications

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“…In this way, one can accommodate collective correlations that are essential to account for deformation, as well as include small but critical configurations from the continuum. Such a pattern is encouraging for possible use of the SA framework to provide the structure component to reaction models that properly account for the continuum [230,231] (e.g., see Secs. 4.1 and 4.3.2).…”

Section: 12]mentioning

confidence: 85%

“…One way to address the long-distance behavior of nuclear wave function and to introduce coupling to the continuum is by using a basis that explicitly considers cluster degrees of freedom. This can be done through a combination of the NCSM with the Resonating Group Method (RGM) [287,288,289,231]. In the RGM [290], nucleons are organized within different groups, or clusters, "resonating" through the intercluster exchange of nucleons.…”

Section: The Resonating Group Methodsmentioning

confidence: 99%

Section: The Resonating Group Methodsmentioning

confidence: 99%

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White paper: from bound states to the continuum

Johnson

Launey

Auerbach

et al. 2020

J. Phys. G: Nucl. Part. Phys.

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This white paper reports on the discussions of the 2018 Facility for Rare Isotope Beams Theory Alliance (FRIB-TA) topical program ‘From bound states to the continuum: Connecting bound state calculations with scattering and reaction theory’. One of the biggest and most important frontiers in nuclear theory today is to construct better and stronger bridges between bound state calculations and calculations in the continuum, especially scattering and reaction theory, as well as teasing out the influence of the continuum on states near threshold. This is particularly challenging as many-body structure calculations typically use a bound state basis, while reaction calculations more commonly utilize few-body continuum approaches. The many-body bound state and few-body continuum methods use different language and emphasize different properties. To build better foundations for these bridges, we present an overview of several bound state and continuum methods and, where possible, point to current and possible future connections.

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Section: 12]mentioning

confidence: 85%

Section: The Resonating Group Methodsmentioning

confidence: 99%

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White paper: from bound states to the continuum

Johnson

Launey

Auerbach

et al. 2020

J. Phys. G: Nucl. Part. Phys.

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“…5b). While these calculations limit the antisymmetrization to two nucleons only, this is a first step toward constructing effective nucleon-nucleus potentials for light and medium-mass nuclei for the astrophysically relevant energies [59,60].…”

Section: Optical Potential In the Symmetry-adapted Framework For Nucl...mentioning

confidence: 99%

Emergent symmetries in atomic nuclei: Probing nuclear dynamics and physics beyond the standard model

Launey,

Becker,

Sargsyan

et al. 2023

SciPost Phys. Proc.

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Dominant shapes naturally emerge in atomic nuclei from first principles, thereby establishing the shape-preserving symplectic Sp(3, \mathbb{R}ℝ) symmetry as remarkably ubiquitous and almost perfect symmetry in nuclei. We discuss the critical role of this emergent symmetry in enabling machine-learning descriptions of heavy nuclei, ab initio modeling of \alphaα clustering and collectivity, as well as tests of beyond-the-standard-model physics. In addition, the Sp(3, \mathbb{R}ℝ) and SU(3) symmetries provide relevant degrees of freedom that underpin the ab initio symmetry-adapted no-core shell model with the remarkable capability of reaching nuclei and reaction fragments beyond the lightest and close-to-spherical species.

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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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New Ab Initio Approach to Nuclear Reactions Based on the Symmetry-Adapted No-Core Shell Model

Cited by 3 publications

References 9 publications

White paper: from bound states to the continuum

White paper: from bound states to the continuum

Emergent symmetries in atomic nuclei: Probing nuclear dynamics and physics beyond the standard model

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

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