Nuclear Theory·nucl-th

Friday·March 21, 2025

12 papers—5 primary·7 cross-listed

01
[Submitted on 19 Mar 2025]
Study of light $ϕ$ -mesic nuclei with HAL QCD $ϕN$ interactions
I. Filikhin🇺🇸 · R. Ya. Kezerashvili🇺🇸 · B. Vlahovic🇺🇸
We explore the possible existence of light $ϕ$ -mesic nuclei using HAL QCD $ϕN$ interactions for the $^{2} S_{1/2}$ and $^{4} S_{3/2}$ channels. Particularly, using the Faddeev formalism in configuration space, the $ϕN N$ system, and $_{ϕ}^{9}$ Be and $_{ϕϕ}^{6}$ He nuclei within the framework of the three-body cluster model, are investigated. The $ϕ α$ effective potential, obtained through a folding procedure, involves the HAL QCD $ϕN$ interaction in the $^{4} S_{3/2}$ channel which does not lead to a bound state of the $ϕN$ pair while the $ϕN$ $^{2} S_{1/2}$ channel yields the bound state as the $_{ϕ}^{3}$ H nucleus. The $^{4} S_{3/2}$ potential ensures that the folding procedure is appropriate because there are no open channels like $ϕ + N$ and $ϕ + 2 N$ near or below the $ϕ + 4 N$ threshold, and it utilizes different matter distributions of $^{4}$ He proposed in the literature. The folding potential is approximated by the Woods-Saxon formula. The mirror systems $ϕ$ + $α$ + $α$ and $ϕ$ + $ϕ$ + $α$ have energy ranges from 1-11 MeV and 3-10~MeV, respectively. The predicted binding energies represent the minimal values for the hypothetical $ϕ$ mesic nuclei $_{ϕ}^{5}$ He, $_{ϕ}^{9}$ Be and $_{ϕϕ}^{6}$ He. The phenomenological $α α$ and $ϕϕ$ potentials are adopted from the literature.
Comments:
19 pages,6 figures. arXiv admin note: substantial text overlap with arXiv:2408.13415, arXiv:2407.12190
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2503.15692 [pdf]
J.Subatomic Part.Cosmol.(2025)·3 citations
02
[Submitted on 19 Mar 2025]
Electromagnetic moments in the Sn-Gd region determined within nuclear DFT
H. Wibowo · B. C. Backes · J. Dobaczewski · R. P. de Groote · A. Nagpal · A. Sánchez-Fernández · X. Sun · J. L. Wood
Within the nuclear DFT framework, employing the Skyrme UNEDF1 functional and incorporating pairing correlations, we determined the spectroscopic electric quadrupole and magnetic dipole moments of the $ν 11/ 2^{-}$ and $π 7/ 2^{+}$ configurations in heavy, deformed, open-shell odd nuclei with $50 \leq Z \leq 64$ . The notions of self-consistent shape and spin polarisations due to odd nucleons responsible for generating total electric quadrupole and magnetic dipole moments were transformed into detailed computational procedures. The alignment of intrinsic angular momentum along the axial symmetry axis, necessitating signature and time-reversal symmetry breaking, followed by the restoration of rotational symmetry, proved to be essential components of the method. In contrast, the restoration of particle number symmetry yields modifications of only about 1%. With the isovector spin-spin terms of the functional previously adjusted in near doubly magic nuclei across the mass chart, the calculations were parameter-free. Effective charges and $g$ -factors were not employed. A reasonably good agreement was achieved between the calculated and measured electric quadrupole moments. A similarly fair description of the magnetic dipole moments was obtained for the intruder configurations $ν 11/ 2^{-}$ alongside a poor description of those for $π 7/ 2^{+}$ .
Comments:
35 pages, 19 figures, and supplemental material, version accepted for publication in the Journal of Physics G: Nuclear and Particle Physics
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2503.15738 [pdf]
J.Phys.G(2025)·7 citations
03
[Submitted on 19 Mar 2025]
Neutrinoless $β β$ decay in the interacting boson model based on the nuclear energy density functionals
Kosuke Nomura🇯🇵
The neutrinoless $β β$ ( $0 ν β β$ ) decay nuclear matrix elements (NMEs) are calculated in the interacting boson model (IBM), which is based on the nuclear energy density functional (EDF) theory. The Hamiltonian of the IBM that gives rise to the energies and wave functions of the ground and excited states of $0 ν β β$ decay emitting isotopes and corresponding final nuclei is determined by mapping the self-consistent mean-field deformation-energy surface obtained with a given EDF onto the corresponding bosonic energy surface. The transition operators are formulated using the generalized seniority scheme, and the pair structure constants are determined by the inputs provided by the self-consistent calculations. The predicted values of the $0 ν β β$ -decay NMEs with the nonrelativistic and relativistic EDFs are compared with those resulting from different many-body methods. Sensitivities of the predicted NMEs to the model parameters and assumptions are discussed.
Comments:
23 pages, 14 figures, 16 tables
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2503.15741 [pdf]
PRC(2025)·3 citations
04
[Submitted on 20 Mar 2025]
The role of spin-isospin symmetries in nuclear $β$ -decays
Simone Salvatore Li Muli · Tor R. Djärv · Christian Forssén · Daniel R. Phillips
A century ago, Wigner's SU(4) symmetry was introduced to explain the properties of atomic nuclei. Despite recent revived interest, its impact on nuclear structure, transitions, and reactions has not been fully explored. Here, we show that a variety of high-fidelity nuclear interactions predict nuclear states that have $\geq 90$ \% probability of being in a single SU(4) irreducible representation. Meanwhile, our analysis of axial current operators in chiral effective field theory ( $χ$ EFT) reveals that one-body currents at low momentum transfer act only within SU(4) irreducible representations, while two-body currents connect different representations. These selection rules interfere with the expected convergence pattern of the $χ$ EFT expansion and explain key phenomenological observations, e.g., the unnaturally large two-body corrections to the axial-current matrix elements in eight-body nuclei.
Comments:
matching resubmitted version
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2503.16372 [pdf]
PRL(2026)·12 citations
05
[Submitted on 20 Mar 2025]
Acceptance dependence of factorial cumulants, long-range correlations, and the antiproton puzzle
Adam Bzdak🇵🇱 · Volker Koch🇺🇸 · Volodymyr Vovchenko🇺🇸
We analyze joint factorial cumulants of protons and antiprotons in relativistic heavy-ion collisions and point out that they obey the scaling $C^_{nm}^{p, p ˉ} \propto ⟨ N_{p} ⟩^{n} ⟨ N_{p ˉ} ⟩^{m}$ as a function of acceptance when only long-range correlations are present in the system, such as global baryon conservation and volume fluctuations. This hypothesis can be directly tested experimentally without the need for corrections for volume fluctuations. We show that if correlations among protons and antiprotons are driven by global baryon conservation and volume fluctuations only, the equality $C^_{2}^{p} / ⟨ N_{p} ⟩^{2} = C^_{2}^{p ˉ} / ⟨ N_{p ˉ} ⟩^{2}$ holds for large systems created in central collisions. We point out that the experimental data of the STAR Collaboration from phase I of RHIC beam energy scan are approximately consistent with the scaling $C^_{nm}^{p, p ˉ} \propto ⟨ N_{p} ⟩^{n} ⟨ N_{p ˉ} ⟩^{m}$ , but the normalized antiproton correlations are stronger than that of protons, $- C^_{2}^{p ˉ} / ⟨ N_{p ˉ} ⟩^{2} > - C^_{2}^{p} / ⟨ N_{p} ⟩^{2}$ . Existing theoretical baselines, based on global baryon conservation and volume fluctuations, cannot explain the data, to which we refer as the antiproton puzzle. We also discuss high-order factorial cumulants which can be measured with sufficient precision within phase II of RHIC-BES.
Comments:
10 pages, 3 figures, published version
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2503.16405 [pdf]
PRC(2025)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE

Study of light ϕ-mesic nuclei with HAL QCD ϕN interactions

Electromagnetic moments in the Sn-Gd region determined within nuclear DFT

Neutrinoless ββ decay in the interacting boson model based on the nuclear energy density functionals

The role of spin-isospin symmetries in nuclear β-decays

Acceptance dependence of factorial cumulants, long-range correlations, and the antiproton puzzle

Affiliations

Study of light $ϕ$ -mesic nuclei with HAL QCD $ϕN$ interactions

Neutrinoless $β β$ decay in the interacting boson model based on the nuclear energy density functionals

The role of spin-isospin symmetries in nuclear $β$ -decays