Highlights
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New evaluation and validation toward neutron reaction data on chromium isotopes at incident energies below 200 MeV
2026, 50(7): 074101. doi: 10.1088/1674-1137/ae5807
Chromium (Cr) serves as an indispensable structural material in accelerator-driven systems (ADSs) and Generation IV reactors, where the precision of its neutron reaction data is important for ensuring reactor safety and operational reliability. However, significant discrepancies persist in both experimental data and evaluations for key reaction channels, such as $(n, p)$ and $(n, 2n)$, across the chromium isotopes ${}^{50,52,53,54}{\rm{Cr}}$. This paper presents a novel evaluation and validation of neutron reaction data for these isotopes at incident energies below 200 MeV, incorporating 571 experimental datasets from EXFOR covering cross sections, angular distributions, energy spectra, and double - differential cross sections. The newly evaluated data provide more reliable key cross sections: the ${}^{52}{\rm{Cr}}(n,2n)$ cross section resolves discrepancies and supports the data of Liskien et al.; the ${}^{52}{\rm{Cr}}(n, p)$ cross-section aligns well with natural chromium data across all energies and is validated by competition analysis. The results accurately replicate double differential cross sections and energy spectra, with neutron emission spectra matching experimental peaks and charged - particle spectra agreeing with measurements for ${}^{50,52}{\rm{Cr}}$. Moreover, the abundance - weighted sum of $(n, p)$ and $(n, 2n)$ cross sections for chromium isotopes agrees well with natural chromium data, confirming systematic consistency. All evaluations are validated using 62 ICSBEP 2014 benchmark facilities with $ k_{{\rm{eff}}}$ sensitivity to chromium neutron data > 1%. For the PMI002_01 experiment, the calculated $ k_{{\rm{eff}}}$ value decreased by $\sim 1000$ pcm relative to the CENDL - 3.2 results, improving agreement with the benchmark; in the OKTAVIAN shielding benchmark, the neutron leakage spectrum also reproduced experiments well. -
Effective field theory description of light dilaton
2026, 50(7): 073112. doi: 10.1088/1674-1137/ae6da0
Dilatons, the CP-even pseudo-Nambu-Goldstone bosons arising from spontaneous scale symmetry breaking, offer a compelling alternative to axion-like particles (ALPs) yet lack a comprehensive low-energy framework. We address this by constructing a systematic effective field theory (EFT) for the dilaton based on a manifestly scale-invariant regularization scheme. This approach derives universal linear couplings to the trace anomaly while preserving consistent renormalization group evolution. We establish a hierarchical EFT tower connecting the ultraviolet conformal sector to the infrared, encompassing the dilaton-extended SMEFT, low-energy EFT up to dimension-7, and a chiral Lagrangian describing meson and baryon interactions. We perform a comprehensive phenomenological analysis across two distinct mass regimes, where the dilaton manifests as either a conventional particle or a wave-like particle. For MeV-scale dilatons behaving as conventional particles, we obtain constraints from LHC production, semi-invisible B- and K-meson decays, and supernova cooling. For ultralight dilatons acting as dark matter, we project sensitivities for atomic clocks and atom interferometers. This unified EFT framework would pave the way for extended phenomenological studies across the full mass spectrum of the light dilaton. -
Analysis of molecular state ηcD* and J/ψD* in the effective Lagrangian approach
2026, 50(7): 073105. doi: 10.1088/1674-1137/ae5f08
In this work, we investigate the production and decay of molecular states with quark content $cc\bar c\bar q$ and $J^P=1^+$ using a phenomenological analysis and an effective Lagrangian approach. Based on an SU(3) flavor-symmetry analysis to identify golden channels, we further explore the dynamics of these processes under the molecular assumptions of ${\eta_c D^*}$ and ${J/\psi D^*}$. Our results indicate that the production branching ratio in $B_c$ decays is sizable: it can be of order $10^{-4}$ for the molecular configuration ${{\eta}_cD^*}$ and $10^{-5}$ for the molecule ${J/\psi D^*}$. In addition, we find that the decay widths of the two molecular configurations ${{\eta}_cD^*}$ and ${J/\psi D^*}$ are not significant, at the level of ${\cal{O}}$($\text{MeV}$).
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Constraints on the canonical single-field slow-roll inflation model from observations
Published: 2026-08-19, doi: 10.1088/1674-1137/ae8cf2
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Charge Separation Measurements in Au+Au collisions at ${ \sqrt{{\boldsymbol s}_{\boldsymbol{NN}}}} $ = 7.7–200 GeV in Search of the Chiral Magnetic Effect
Published: 2026-08-10
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The S-wave topped meson
Published: 2026-07-16, doi: 10.1088/1674-1137/ae7963
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Effect of gravitational lensing around a black hole in a dark matter halo in the presence of plasma
2026, 50(10): 105103-105103-16. doi: 10.1088/1674-1137/ae7961Show AbstractThis article is devoted to investigating the observational properties of a Schwarzschild black hole (BH) surrounded by a dark matter (DM) halo. First, we briefly review the spacetime and analyze the event horizon radius. Subsequently, we explore the dynamics of massive and massless particles around the Schwarzschild BH surrounded by a dark matter halo, including the innermost stable circular orbit (ISCO) and photon sphere radii. We find that the ISCO radius increases under the influence of the spacetime parameters. Additionally, we investigate weak gravitational lensing assuming a uniform or non-uniform plasma surrounding the BH. Finally, we examine the impact of the plasma on the BH shadow and employ the Event Horizon Telescope (EHT) observational data to constrain the BH's parameters.
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Automated extraction of Collins–Soper kernel from lattice QCD using an autonomous AI physicist system
2026, 50(10): 103104-103104-8. doi: 10.1088/1674-1137/ae71a9Show AbstractWe employ PHYSMASTER, an AI-assisted agentic system that integrates theoretical reasoning, numerical computation, and long-horizon workflow automation, to address long-standing challenges in non-perturbative lattice analyses, including low signal-to-noise ratios at large transverse separations, complex systematic uncertainties, and labor-intensive manual workflows. Using the extraction of the Collins–Soper (CS) kernel from quasi–transverse-momentum-dependent wave functions (quasi-TMDWFs) via large-momentum effective theory (LaMET) as a showcase, we demonstrate that, once the theoretical framework, renormalization prescription, and physically motivated ansätze are specified, PHYSMASTER can automate high-dimensional fitting, renormalization, continuum–chiral extrapolation, and non-perturbative reconstruction. For the dataset considered here, the resulting multi-stage analysis can be completed within a few hours after the lattice correlators are prepared, while yielding results consistent with perturbative QCD and state-of-the-art lattice calculations. The framework stabilizes the large-$ b_\perp$ region out to 1 fm and provides a generalizable, reproducible paradigm for AI-automated studies of parton structure and other non-perturbative observables in lattice QCD.
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Neutrino masses, anomalous magnetic moments and dark matter with vector-like fermions and an inert scalar doublet
2026, 50(10): 103102-103102-32. doi: 10.1088/1674-1137/ae6b41Show AbstractThe beyond-the-standard-model scenario presented in this work is motivated by the observations of neutrino masses, the anomalous magnetic moments of the electron and muon, and dark matter in the Universe. We explain these observations by extending the standard model with two generations of vector-like fermions and an inert scalar doublet, all of which are odd under a $Z_2$ symmetry. The light neutrino masses and mixings are generated radiatively while maintaining consistency with bounds on lepton flavor violation. Loop diagrams featuring the same fields also explain the anomalous magnetic moments. Similarly, the correct dark matter relic abundance is reproduced without conflicting with direct detection constraints, or those from big bang nucleosynthesis or cosmic microwave background observations. Finally, prospective signatures at the LHC are discussed.
Current Issued
2026 Vol. 50, No. 8
Published: 27 July 2026
Published: 27 July 2026
Archive
IF: 3.1
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 5, 2026): Determination of Fragmentation Functions from Charge Asymmetries in Hadron Production
- Cover Story (Issue 4, 2026): Initial performance results of the JUNO detector
- Cover Story (Issue 3, 2026): Comprehensive investigation on baryon number violating nucleon decays involving an axion-like particle
- Cover Story (Issue 2, 2026) |The images of Brans-Dicke-Kerr type naked singularities
- Cover Story (Issue 1, 2026) A focused review of quintom cosmology: from quintom dark energy to quintom bounce
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