Highlights
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New constraints on coherent elastic neutrino–nucleus scattering by the νGeN experiment
2025, 49(5): 053004. doi: 10.1088/1674-1137/adb9c8
The$ \nu $ GeN experiment searches for coherent elastic neutrino-nucleus scattering (CE$ \nu $ NS) at the Kalinin Nuclear Power Plant. A 1.41 kg high-purity low-threshold germanium detector surrounded by active and passive shielding is deployed at the minimal distance of 11.1 m allowed by the lifting mechanism from the center of the reactor core, utilizing one of the highest antineutrino fluxes among competing experiments. The direct comparison of the count rates obtained during reactor-ON and reactor-OFF periods with the energy threshold of 0.29 keV$ _{ee} $ shows no statistically significant difference. New upper limits on the number of CE$ \nu $ NS events are evaluated on the basis of the residual ON$ - $ OFF count rate spectrum. -
Model-independent constraints on the Hubble constant using lensed quasars and the latest supernova
2025, 49(5): 055107. doi: 10.1088/1674-1137/adbc87
The Hubble constant$H_0$ , a key parameter quantifying the present expansion rate of the universe, remains a subject of significant debate due to the persistent tension between early- and late-universe measurements. Strong gravitational lensing (SGL) time delays provide an independent avenue to constrain$H_0$ . In this paper, we utilize seven SGL systems from the TDCOSMO sample to constrain$H_0$ , employing the model-independent approaches: deep neural networks (DNN), Gaussian process (GP), polynomial fitting (polyfit) and Padé approximant (PA). Using these methods, we reconstruct unanchored luminosity distances from the Pantheon+ SNe Ia dataset and obtain$H_0=72.3^{+3.8}_{-3.6}$ km s−1 Mpc−1,$H_0=72.4^{+1.6}_{-1.7}$ km s−1 Mpc−1,$H_0=70.7^{+3.0}_{-3.1}$ km s−1 Mpc−1 and$H_0=74.0^{+2.7}_{-2.7}$ km s−1 Mpc−1, respectively. These estimates are consistent within 1σ level and align with local distance ladder results. Notably, the GP method achieves uncertainties that are half those of the DNN approach, whereas the DNN method offers more reliable confidence intervals in reconstruction at high redshifts. Our findings underscore the potential of these methodologies to refine constraints on$H_0$ and contribute to resolving the Hubble tension with future advancements. -
Model for Glauber-type calculations of beam fragmentation at low energies
2025, 49(5): 054106. doi: 10.1088/1674-1137/adb2fc
In this study, a Glauber-type model for describing nuclear fragmentation in light targets at energies below 100$A\cdot$ MeV is presented. It is developed based on the Glauber model within the nucleon transparent limit, in which the Lorentz-invariant phase space factor is introduced to account for energy and momentum conservation. Accordingly, the scope of the applicability of the model is discussed. The longitudinal momentum distributions of the most neutron-rich nuclei (10Be, 9Li, and 8He), which were produced in a few nucleon removal reactions during the 11B fragmentation of a Be target at beam energies of 10, 30, and 100$A\cdot$ MeV, are calculated. The results of the calculations are then compared to the predictions of statistical fragmentation models, such as the Goldhaber model. Using the new model, the asymmetric longitudinal momentum distributions at low energies are explained by the kinematical locus and geometry of the reaction.
Just Accepted
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The CP violations and branching ratios for Bc+→ D(s)+π+π−(K+K−) from interference of the vector mesons in Perturbative QCD
Published: 2025-05-20
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The Fox-Wolfram Moment of Jet Production in Relativistic Heavy Ion Collisions
Published: 2025-05-18
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Influence of neutron-pairs condensation on the charge radii difference of mirror nuclei
Published: 2025-05-18
Recent
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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. 5
Published: 29 April 2025
Published: 29 April 2025
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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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Cover Story
- Cover Story (Issue 1, 2025) Comments on Prediction of Energy Resolution inthe JUNO Experiment
- Cover Story (Issue 12, 2024) | Doubly heavy meson puzzle: precise prediction of the mass spectra and hadronic decay with coupled channel effects to hunt for beauty-charm family
- Cover Story (Issue 9, 2024) Measurement of solar pp neutrino flux using electron recoil data from PandaX-4T commissioning run
- Cover Story (Issue 11, 2024) ｜ Form factor for Dalitz decays from J/ψ to light pseudoscalars
- Cover Story (Issue 3, 2024) | First measurement of the ground-state mass of 22Al helps to evaluate the ab-initio theory
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