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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Acoustic Black Hole in Hayward Spacetime: Shadow, Quasinormal Modes and Analogue Hawking Radiation
Published: 2026-06-24, doi: 10.1088/1674-1137/ae7282
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Frame Dependence in Generalized Chiral Kinetic Theory
Published: 2026-06-24, doi: 10.1088/1674-1137/ae740d
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Correlation between diffuseness and EMC effect of nuclei with A≥ 12
Published: 2026-06-21, doi: 10.1088/1674-1137/ae6ed4
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Effective field theory description of light dilaton
2026, 50(7): 073112-073112-24. doi: 10.1088/1674-1137/ae6da0Show AbstractDilatons, 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.
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Research on the contribution of s-process to the abundance of 94Mo
2026, 50(7): 074102-074102-7. doi: 10.1088/1674-1137/ae5ef4Show AbstractThis paper addresses a long-standing problem in astrophysics—the origin of the solar system abundance of the proton-rich isotope $ ^{94}\text{Mo} $ by proposing a valuable novel mechanism. The main contribution of this work is that it challenges the traditional view of "$ ^{94}\text{Mo} $ as a pure p-process nuclide". For the first time, it demonstrates that within the s-process environment of low-mass AGB stars, a new s-process path ($ ^{93}\text{Zr} \rightarrow $ $ ^{93}\text{Nb} $ $ \rightarrow ^{94}\text{Nb} \rightarrow ^{94}\text{Mo} $) for producing $ ^{94}\text{Mo} $ can be opened, enabled by the significant enhancement of the effective decay rates of $ ^{93}\text{Zr} $ and $ ^{94}\text{Nb} $ due to the high-temperature astrophysical environment. The results show that this s-process channel can contribute up to a maximum of approximately 10.6% to the solar system abundance of $ ^{94}\text{Mo} $. This work provides a new s-process perspective on the origin of $ ^{94}\text{Mo} $ and has implications for reevaluating the sources of other "shielded" p-nuclei.
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The medium modification of the charge-weighted Energy-Energy Correlators in Pb+Pb collisions at ${\sqrt{{\boldsymbol s}_{\boldsymbol{NN}}}\bf =5.02}$ TeV
2026, 50(7): 074103-074103-9. doi: 10.1088/1674-1137/ae62ffShow AbstractWe report a systematic study and predictions of medium-induced modifications in charge-dependent jet substructure using the charge-weighted Energy-Energy Correlators (EEC) in 0−10% central Pb+Pb collisions at $ \sqrt{s_{NN}} = 5.02\ {\rm{TeV}} $. Charged-hadron jets, as well as flavor-separated quark- and gluon-initiated jets with momenta of 40−60 GeV and R = 0.4, are analyzed. The ratio of the charge-weighted distribution to the inclusive EEC, which reflects the magnitude of charge correlations, is uniformly negative, demonstrating the dominance of opposite-charge pairs due to charge conservation. A clear flavor dependence is observed: gluon-initiated jets exhibit weaker opposite-charge correlations in the transition and small-RL regions than quark-initiated jets, but stronger opposite-charge correlations at larger RL. In Pb+Pb collisions, the A+A-to-p+p ratio for charge correlations exhibits a universal, flavor-independent pattern: jet quenching enhances opposite-charge correlations at small angles while suppressing them at large angles, leading to a steeper RL dependence of charge correlations in A+A and indicating more rapid decorrelation as RL increases. A distinctive V-shaped modification, together with a plateau-like enhancement, appears in the transition and small-RL regions, independent of jet flavor. By factorizing the EEC into the charged-hadron–pair multiplicity and the average energy-weighting distribution, we identify an enhanced but smeared energy weighting of opposite-charge pairs at small RL as the origin of this modification. These observations indicate that medium-induced broadening of parton-level splittings in the hot, dense medium dissociates the charged di-hadron pairs (such as $ \pi^+\pi^{-} $) present in p+p collisions. The plateau-like enhancement of charge correlations is also found to be unrelated to selection-bias effects.
Current Issued
2026 Vol. 50, No. 6
Published: 01 June 2026
Published: 01 June 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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