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Nuclear Theory·nucl-th

Friday·May 9, 2025

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 01

    Point-proton density distributions of stable nuclei

    Tianyu Wu · Baohua Sun · Huihui Xie · Junyao Xu · Ge Guo

    Point-proton density distributions are deduced for 130 stable nuclei from to from nuclear charge densities determined in elastic electron scattering. There are 171 cases are presented in model-dependent forms, including the modified Harmonic-oscillator function, two-parameter Femi function (2pF), three-parameter Femi function, three-parameter Gaussian function, and 97 in Fourier-Bessel series model-independent forms. Independent of density functions, the point-proton root-mean-square (rms) radii of the derived point-proton density show excellent agreement with each other. We identify cases where the tabulated data of charge densities and charge radii are inconsistent, and the deduced point-proton density distributions are inaccurate due to insufficient experimental momentum transfer coverage or inconsistent scattering experiments. For the widely used 2pF distribution, it is found that the surface diffuseness parameters can be empirically calculated from those of charge density, while the half-density radius parameters follow the rule. The derived point-proton density distributions can be used as input in nuclear reaction studies and compared with nuclear model predictions.

    nucl-thnucl-exAtom.Data Nucl.Data Tabl.(2025)·2 citations
  2. 02

    The candidates of 2 condensate around the 16O nucleus studied by the real-time evolution method

    Y.M. Htet · T. Oishi · M. Kimura · Q. Zhao · B. Zhou

    Background: Searching for alpha condensation around a core nucleus, a new class of nuclear clustering, is an interesting topic. Previous theoretical studies predicted 16O + 2 condensed states. However, in those studies, the strong mixing with non-resonant states made the identification of true resonant states non-trivial. Purpose: To address this issue, we aim to provide a more robust theoretical verification of the 16O + 2 condensation. Our goal is to clearly identify the resonant states and predict their properties, such as decay widths. Method: We employ the real-time evolution method (REM), which generates physically important basis states using the equation of motion, minimizing contamination from the continuum. The analytical continuation in the coupling constant (ACCC) was used to estimate the -decay widths. Results: The present calculations show much better convergence of eigenstates, and the and states showed remarkable isoscalar monopole transition strengths, which were in good agreement with the predictions of Ichikawa et al. The small alpha-decay widths for these states suggest that experimental observation appears feasible. Conclusion: The present results show the reasonable agreement with a previous work, firmly establishing the and states approximately 5 and 1 MeV below the 16O + 2 threshold as candidates for the 2 condensation around the core nucleus 16O. The REM proved effective in identifying these states.

    nucl-thnucl-exPRC(2025)·0 citations
  3. 03

    Insights into Neutron Star Matter: EoS Models and Observations

    Zuhua Ji🇨🇳 · Jiarui Chen🇨🇳 · Yan Chen🇨🇳

    The equation of state (EoS) for neutron stars is a crucial topic in astrophysics, nuclear physics, and quantum chromodynamics (QCD), influencing their structure, stability, and observable properties. This review classifies EoS models into hadronic matter, hybrid, and quark matter models, analyzing their assumptions, predictions, and constraints. While hadronic models characterize nucleonic matter, potentially including contributions from hyperons or mesons, hybrid models introduce phase transitions to quark matter, and quark models hypothesize the presence of deconfined quark matter cores or entirely quark-composed stars. By synthesizing results from recent theoretical and observational studies, this review aims to offer a comprehensive understanding of the methodologies used in constructing neutron star EoS, their implications, and future directions.

    nucl-thastro-ph.HEgr-qc3 citations
  4. 04

    Manifest Gauge Invariance for Structure Dependent Radiative Corrections to Processes Involving Atoms and Nuclei

    Ryan Plestid🇺🇸 · Mark B. Wise🇺🇸

    Radiative corrections to reactions involving atoms or nuclei can become sensitive to the structure of the bound state. Generically, one encounters correlation functions of multiple currents which must satisfy Ward identities. At intermediate steps, however the Ward identities are obscured, and often violated by physically motivated approximation schemes. In this paper we outline a method to construct a representation of the aforementioned correlators that manifests gauge invariance in the limit of a heavy target (i.e., when recoil energy can be neglected). This representation then enables manifestly gauge invariant approximation schemes. Furthermore, the proposed representation naturally separates the largest contributions that dominate scattering amplitudes in the limit of a heavy constituent (e.g., proton) mass. We analyze elastic electron scattering from nuclei in detail, and also discuss radiative corrections to processes mediated by the weak interaction.

    nucl-thhep-phnucl-ex4 citations
  5. 05

    Comparison of integral equations used to study for a stable

    Sebastian M. Dawid🇺🇸 · Fernando Romero-López🇨🇭 · Stephen R. Sharpe🇺🇸

    We perform a detailed comparison between three formalisms used in recent studies of scattering, which aim to understand the properties of the doubly-charmed tetraquark, . These methods are the three-particle relativistic field theory (RFT) formalism, the two-body Lippmann-Schwinger (LS) equation with chiral effective field theory potentials, and the two-particle relativistic framework proposed by Baiao Raposo and Hansen (BRH approach). In a simplified single-channel setting, we derive the conditions under which the infinite-volume integral equations from the RFT and BRH approaches reduce to the LS form. We present numerical examples showing that differences between these methods can be largely removed by adjusting short-range couplings. We also address a number of technical issues in the RFT approach.

    nucl-thhep-lathep-phJHEP(2025)·12 citations

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first authorsco-authorsvia INSPIRE