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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Pear Shape and Tetrahedral Shape Competition in Actinide Nuclei
Published: 2025-05-15
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Radially excited pion: electromagnetic form factor and the box contribution to the muon's g-2
Published: 2025-05-12
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Unveiling Axion Signals in Galactic Supernovae with Future MeV Telescopes
Published: 2025-05-12
Recent
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Weak magnetic effect in quark-gluon plasma and local spin polarization
2025, 49(7): 071001-071001-6. doi: 10.1088/1674-1137/adc120Show AbstractWe propose the weak magnetic effect, which emerges as the dissipative correction to the quark phase space distribution function in quark-gluon plasma close to local thermal equilibrium, as a novel contribution to the observed Lambda hyperon local spin polarization. A finite field strength that is consistent with previous estimates of the magnetic field in heavy-ion collisions can be used to xplain the experimentally observed Lambda local spin polarization through all centrality classes. Moreover, the weak magnetic effect plays an unambiguous role in the ordering between the second-order and third-order modulations of experimental Lambda local spin polarization.
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Search for the leptonic decay
${\boldsymbol D^{\bf +}{\bf\to}{\boldsymbol e}^{\bf +}\boldsymbol\nu_{\boldsymbol e}}$ 2025, 49(6): 063001-063001-10. doi: 10.1088/1674-1137/adc11dShow AbstractWe 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. -
Shadow cast by the Kerr MOG black hole under the influence of plasma and constraints from EHT observations
2025, 49(6): 065107-065107-17. doi: 10.1088/1674-1137/adb9c5Show AbstractThe study of black hole (BH) shadows provides crucial insights into the nature of strong gravitational effects and the intricate structure of spacetime surrounding BHs. In this study, we investigate the shadow of a Kerr MOG BH in a plasma environment, examining the extent to which the presence of plasma alters the characteristics of the observed shadow compared with that in vacuum conditions. Our analysis reveals that the shadow characteristics of M87* and Sgr A* are more compatible with event horizon telescope (EHT) observational data in nonhomogeneous plasma spacetime than in homogeneous plasma spacetime. For a small metric deformation parameter
$ \alpha $ , the shadow aligns within$ 2\sigma $ uncertainty for homogeneous plasma and within$ 1\sigma $ for nonhomogeneous plasma. Next, we determine the energy emission rate for the Kerr MOG BH and analyze the influence of parameters α,$ k_o $ ,$ k_\theta $ , and$ k_r $ on particle emissions in the BH vicinity. We further analyze the deflection angle in the presence of homogeneous and nonhomogeneous plasma profiles. The findings indicate notable differences from the vacuum scenario, underscoring the importance of accounting for plasma effects in examining light propagation around compact objects.
Current Issued
2025 Vol. 49, No. 5
Published: 29 April 2025
Published: 29 April 2025
Archive
IF: 3.6
Monthly issued, founded in 1977
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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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