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 ${\cal{O}}$($\text{MeV}$).
Just Accepted
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The S-wave topped meson
Published: 2026-07-16, doi: 10.1088/1674-1137/ae7963
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Quasi-two-body decays B+ → Ds+(R→)K+K- in the perturbative QCD approach
Published: 2026-07-15
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Strong Gravitational Lensing and Shadow Signatures of Anisotropic Black Holes in Plasma
Published: 2026-07-11, doi: 10.1088/1674-1137/ae7706
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Dynamical double-folding potentials for α decay in odd-A nuclei: Comparison between Migdal and CDM3Y6 interactions
2026, 50(9): 094104-094104-12. doi: 10.1088/1674-1137/ae7cffShow AbstractThe dynamical double-folding potential (DDFP) model is extended to investigate the α decays of odd-A nuclei in the region $ 78 \le Z \le 90 $. We present a systematic comparison between the deep-well DDFP based on the CDM3Y6 nucleon-nucleon interaction and the pocket-type DDFP based on the Migdal interaction. Both potentials reproduce the experimental α-decay half-lives satisfactorily, with root-mean-square deviations of $ \sigma = 0.212 $ and 0.250, respectively. The two potentials also yield similar trends in α preformation factors ($ P_\alpha $) for both favored and unfavored transitions, reflecting the high sensitivity of $ P_\alpha $ to shell structure and the variation of the proton pairing gap. Furthermore, our analysis demonstrates that the significant difference in the $ P_\alpha $ magnitude between the two potentials stems fundamentally from their distinct treatments of Pauli blocking effects.
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High-density isovector uncertainty and direct-Urca thresholds in a ρ-flex density-dependent relativistic mean-field model
2026, 50(9): 1-21. doi: 10.1088/1674-1137/ae823dShow AbstractWe investigate the role of the model dependence of the high-density isovector sector in neutron-star matter within a density-dependent relativistic mean-field framework. A 10-dimensional TW-like DD-RMF baseline model is compared with an 11-dimensional ρ-flex extension in which an additional parameter, $ \xi_\rho $, introduces a controlled deformation of the high-density ρ-meson channel while leaving the saturation-point isovector properties unchanged. Bayesian inference is performed for two data combinations: NS+GW, which includes neutron-star mass and radius measurements and GW170817 tidal information, and ALL+GW, which further incorporates low-density χEFT and heavy-ion-collision constraints. For each posterior sample, we construct the beta-equilibrated equation of state, solve the stellar structure and tidal-response equations, and determine the direct-Urca threshold. The Bayesian evidence differences, $ \Delta\ln Z_{\rm{INS}}=-0.23\pm0.08 $ for NS+GW and $ -0.02\pm0.17 $ for ALL+GW, indicate that present data do not statistically require the additional ρ-channel flexibility. The 10D and 11D models yield similar posterior predictions for the beta-equilibrium pressure, sound speed, mass-radius relation, tidal deformability, and maximum mass. In contrast, the 11D extension broadens the allowed ranges of the high-density symmetry energy, proton fraction, direct-Urca threshold density, onset mass, and direct-Urca activation probability. These results demonstrate that current multimessenger constraints primarily restrict the bulk stiffness of beta-equilibrated matter, while residual uncertainty in the high-density isovector sector remains relevant for composition-sensitive and cooling-related observables.
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Probing quantum phase transitions in the sdg-Interacting Boson Model using von neumann entropy
2026, 50(9): 094103-094103-10. doi: 10.1088/1674-1137/ae75fcShow AbstractIn this work, the von Neumann entropy has been calculated and employed as a probe to analyse quantum phase transitions (QPTs) within the $ sdg $-Interacting Boson Model ($ sdg $-IBM). The von Neumann entropy between the $s$-boson and $dg$-boson sectors is used as an indicator of QPTs and as a robust observable for the theoretical analysis of the $ _{\phantom{108-1}48}^{108-116}\mathrm{Cd} $ isotopes. The von Neumann entropy correctly characterises the QPT in the ${U_d}\left( 5 \right) \otimes{U_g}\left( 9 \right) \leftrightarrow S O_{sdg}\left( {15} \right)$ transition region. The numerical results show that the $ _{\phantom{1}48}^{108}\mathrm{Cd} $ and $ _{\phantom{1}48}^{116}\mathrm{Cd} $ isotopes are located in the ${U_d}\left( 5 \right) \otimes{U_g}$ and $S O_{sdg}(15)$ limits, respectively.
Current Issued
2026 Vol. 50, No. 7
Published: 06 July 2026
Published: 06 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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