Highlights
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Search for the leptonic decay
${\boldsymbol D^{\bf +}{\bf\to}{\boldsymbol e}^{\bf +}\boldsymbol\nu_{\boldsymbol e}}$ 2025, 49(6): 063001. doi: 10.1088/1674-1137/adc11d
We search for the leptonic decay$ D^+\to e^+\nu_{e} $ using an$ e^+e^- $ collision data sample with an integrated luminosity of 20.3 fb$ ^{-1} $ collected with the BESIII detector at a center-of-mass energy of 3.773 GeV. Significant signal is not observed, and an upper limit on the branching fraction of$ D^+\to e^+\nu_{e} $ is set as$ 9.7 \times 10^{-7} $ , at a confidence level of 90%. Our upper limit is an order of magnitude smaller than the previous limit for this decay mode. -
Note on single-trace EYM amplitudes with MHV configuration
2025, 49(6): 063105. doi: 10.1088/1674-1137/adc189
In the maximally-helicity-violating (MHV) configuration, tree-level single-trace Einstein-Yang-Mills (EYM) amplitudes with one or two gravitons have been shown to satisfy a formula in which each graviton splits into a pair of collinear gluons. In this study, we extend this formula to more general cases. We present a general formula that expresses tree-level single-trace MHV amplitudes in terms of pure gluon amplitudes. In this formula, each graviton turns into a pair of collinear gluons. -
Configuration-interaction relativistic Hartree-Fock model
2025, 49(6): 064104. doi: 10.1088/1674-1137/adbdba
The configuration interaction relativistic Hartree-Fock (CI-RHF) model is developed in this work. Compared to the conventional configuration interaction shell model (CISM), the CI-RHF model can be applied to study the structural properties of a wide range of nuclei without readjusting any parameters, as the effective Hamiltonian for different model spaces can be deduced consistently from a universal density-dependent Lagrangian based on the Hartree-Fock single-particle basis. The convergence of intermediate-state excitations has been examined in evaluating the effective interactions, and the core-polarization effects are illustrated, taking$ ^{18} {\rm{O}}$ as an example. Employing the CI-RHF model, both the bulk properties and low-lying spectra of even-even nuclei$^{18-28} {\rm{Ne}}$ have been well-reproduced with the model space restricted to the$ sd $ shell. Studies of the isotopic evolution concerning charge radii and low-lying spectra highlight the shell closure at$ N=14 $ for neon isotopes. Furthermore, the cross-shell calculations extending from the$ sd $ to$ pf $ shell successfully reproduced the low-lying spectra of$ ^{30} {\rm{Ne}}$ and$ ^{32} {\rm{Ne}}$ . Notably, remarkably low excitation energies$ E(2^{+}_{1}) $ of$ ^{30} {\rm{Ne}}$ suggest the disappearance of the conventional magicity$ N=20 $ .
Just Accepted
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Application of physics-informed neural network on multidimensional quantum tunneling
Published: 2025-06-02
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Constraint of symmetry energy slope using neutron skins of 48Ca, 64Ni, 124Sn, and 208Pb and its impact on neutron star radius
Published: 2025-06-02
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The robust occurrence of ∆I = 2 bifurcation in scissors rotation bands
Published: 2025-06-02
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Nuclear matter and neutron star properties constrained by CREX results and astrophysical constraints: A covariance study
2025, 49(7): 074109-074109-15. doi: 10.1088/1674-1137/adc65bShow AbstractThe ground state properties of finite, bulk matter, and neutron stars are investigated using a proposed effective interaction (HPU4) of the relativistic mean field model (RMF) that incorporates self and cross-couplings of σ, ω, and ρ mesons with nucleons. This interaction has been constructed by fitting data on binding energies and charge radii of finite nuclei, neutron skin (
$\Delta r_{{np}}$ ) of$ ^{48} {\rm{Ca}}$ nucleus, and astrophysical observations of the maximum masses of neutron stars.$\Delta r_{np}$ ($ ^{48} {\rm{Ca}}$ ) = 0.146±0.019 fm is achieved with soft symmetry energy ($ J_{0} $ = 27.91±1.31 MeV) and its corresponding slope ($ L_{0} $ = 42.85±14.26 MeV) at saturation density. An equation of state (EoS) with a composition of β-equilibrated nucleonic and leptonic matter is computed. The nuclear matter and neutron star properties are also analyzed for this interaction and agree well with the astrophysical observations, such as the NICER and GW170817 events. We also perform a statistical analysis to estimate the theoretical errors in coupling parameters and neutron star observables and to determine the correlation coefficients. We observe that the neutron skins of$ ^{208} {\rm{Pb}}$ and$ ^{48} {\rm{Ca}}$ are strongly correlated and exhibit a strong dependence on$ J_{0} $ ,$ L_{0} $ and the curvature of symmetry energy ($ K_{\text{sym}} $ ) as suggested from their correlations. A strong correlation of$ R_{1.4} $ with ρ-meson-nucleon coupling quantified by the term$ g_{\rho N} $ and mixed interaction terms$ \sigma\rho_{\mu}\rho^{\mu} $ and$ \sigma^{2}\rho_{\mu}\rho^{\mu} $ is also observed. -
Search for Cabibbo-suppressed decays
${\boldsymbol\Lambda_{\boldsymbol c}^{\bf +} }$ → Σ0K+π0 and$ {\boldsymbol\Lambda_{\boldsymbol c}^{\bf +} }$ → Σ0K+π+π−2025, 49(7): 073001-073001-13. doi: 10.1088/1674-1137/adc88dShow AbstractUtilizing 4.5$ \text{fb}^{-1} $ of$ e^+e^- $ annihilation data collected at center-of-mass energies ranging from 4599.53 MeV to 4698.82 MeV by the BESIII detector at the BEPCII collider, we searched for singly Cabibbo-suppressed hadronic decays$ \Lambda_{c}^{+}\to\Sigma^{0} K^{+}\pi^{0} $ and$ \Lambda_{c}^{+}\to\Sigma^{0}K^{+} \pi^+ \pi^- $ with a single-tag method. No significant signals were observed for both decays. The upper limits on the branching fractions at the 90% confidence level were determined to be$ 5.0\times 10^{-4} $ for$ \Lambda_{c}^{+}\to\Sigma^{0} K^{+}\pi^{0} $ and$ 6.5\times 10^{-4} $ for$ \Lambda_c^{+}\to\Sigma^0K^{+}\pi^{+}\pi^{-} $ . -
Study of the true ternary fission of 248Cf isotope in equatorial and collinear geometries
2025, 49(7): 074103-074103-10. doi: 10.1088/1674-1137/adc7e4Show AbstractThis paper presents a comprehensive investigation of the true ternary fission of the
$ ^{248}\text{Cf} $ isotope. Using the Three-Cluster Model ($ \text{TCM} $ ) based on the$ \text{WKB} $ approximation, detailed calculations were performed for all possible fragment configurations, considering the equatorial and collinear geometries. The fragment charge numbers (Z) were systematically filtered within the range of$ Z = 20 $ to$ Z = 52 $ , and all combinations were examined for three positional arrangements: fragments$ A_{1} $ ,$ A_{2} $ , and$ A_{3} $ occupying the middle position in collinear geometry. For each combination, key quantities were calculated, including driving potential (${V {\text{-}} Q}$ ), penetration probability (P), relative yield (Y), decay constant (λ), and half-life ($ T_{\frac{1}{2}} $ ). The selection of optimal fragment combinations was based on higher penetration probability or minimum driving potential, ensuring a systematic approach to identifying the most favorable fission configurations. Redundancy from permutations of$ Z_{1} $ ,$ Z_{2} $ , and$ Z_{3} $ was eliminated by treating them equivalently. The results highlight the significant influence of fragment geometry and nuclear structure, particularly shell effects, on the fission dynamics. This work provides new insights into the complex mechanisms of true ternary fission, contributing to the broader understanding of nuclear stability and fragment distributions in such processes. The novelty of this study relative to similar research is the investigation of the effects of fragments permutations, geometries, and neutron emission on the fission process.
Current Issued
2025 Vol. 49, No. 6
Published: 29 May 2025
Published: 29 May 2025
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IF: 3.6
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ISSN 1674-1137 CN 11-5641/O4
Original research articles, Ietters and reviews Covering theory and experiments in the fieids of
- Particle physics
- Nuclear physics
- Particle and nuclear astrophysics
- Cosmology
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