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Nuclear Theory·nucl-th

Wednesday·April 15, 2026

9 papers—3 primary·6 cross-listed

All9Primary3Cross-lists6
  1. 01

    Parameter-free deformation variables of the proxy-SU(3) symmetry in even-even atomic nuclei with Z=28-82, N=28-126

    Dennis Bonatsos · V. K. B. Kota · Andriana Martinou · S. K. Peroulis · D. Petrellis · P. Vasileiou · T. J. Mertzimekis · N. Minkov

    The proxy-SU(3) approximation to the shell model, which restores the SU(3) symmetry of the 3-dimensional harmonic oscillator beyond the sd shell, predicts the collective deformation variables beta and gamma of even-even atomic nuclei in a parameter-free way, based on the most symmetric irreducible representation (irrep) of SU(3) allowed by the Pauli principle and the short-range nature of the nucleon-nucleon interaction, which in group theoretical language is the highest weight (hw) irrep. In the few cases in which the hw irrep turns out to be completely symmetric, thus being able to accommodate only the ground state band, the next hw (nhw) irrep becomes indispensable. In the present article complete tables of the hw and nhw irreps are given for all atomic nuclei ranging from Z=28, N=28 to Z=82, N=126, along with the corresponding parameter-free predictions for the deformation variables beta and gamma. A few examples using the tabulated results for providing microscopic insight for specific effects in various regions of the nuclear chart are also given.

    nucl-th0 citations
  2. 02

    Symplectic no-core configuration interaction framework for nuclear structure

    Anna E. McCoy · Mark A. Caprio · Patrick J. Fasano · Tomas Dytrych

    We present the symplectic no-core configuration interaction (SpNCCI) framework, in which the nuclear many-body problem is solved a symmetry-adapted basis that explicitly encodes approximate symmetries associated with nuclear collectivity and deformation. In this framework, calculations are carried out in a basis organized into Sp(3,R) irreducible representations (irreps), each of which can be expressed as an infinite tower of U(3) irreps. In this framework, matrices of realistic relative two-body operators, such as the nuclear Hamiltonian, are computed directly in the Sp(3,R) many-body basis, obviating the need to expand all Sp(3,R) many-body states in, e.g., a U(3)-coupled configuration basis. Instead, many-body matrix elements are obtained via a recurrence relation that expresses a given matrix element in terms of matrix elements between basis states with fewer oscillator quanta. To use this recurrence method for computing matrix elements of relative two-body operators, we must first expand each operator into components of U(3) tensors. To this end, we present a method for decomposing arbitrary operators into U(3) tensor components.

    nucl-th1 citation
  3. 03

    Dynamics of density fluctuations in atomic nuclei

    Francesca Bonaiti · Gaute Hagen · Thomas Papenbrock

    We study the spatiotemporal patterns of density fluctuations in O and Ca using nuclear interactions from chiral effective field theory and the time-dependent coupled-cluster method. We find that two-particle-two-hole excitations generate small-amplitude fluctuations that are fast, short-ranged and of stochastic character.

    nucl-thnucl-exPRL(2026)·0 citations

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first authorsco-authorsvia INSPIRE