Highlights
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Moments from momentum derivatives in lattice QCD
2025, 49(10): 101001. doi: 10.1088/1674-1137/aded04We show that the traditional moments approach in lattice quantum chromodynamics based on operator product expansion can be realized such that it utilizes derivatives in momentum rather than in distance. This avoids power divergent mixings, and thus allows to extract moments order by order to all orders in principle. Further, by exploiting the symmetry of lattice matrix elements, we can determine the even and odd moments separately. As a demonstrative example, we determine the first three moments beyond the tensor charge
$ g_T$ of the isovector quark transversity distribution in the nucleon. -
Improvements of time-of-flight detector utilizing a thin foil and crossed static electric and magnetic fields
2025, 49(10): 104001. doi: 10.1088/1674-1137/ade95bWe developed a time-of-flight (TOF) detector with a thin foil for mass measurements of unstable nuclei using the Rare-RI Ring at the RIKEN RI beam factory. Compared to the previous design, the developed TOF detector employed modified electrodes, and its static electric and magnetic fields were reduced. We improved the detection efficiency and stability of operation. Its specification and design were finally fixed for mass measurements. We also developed a position-sensitive detector based on the principles of the TOF detector. This study utilized larger microchannel plate (MCP) detectors than those of the prototype. By improving acceptance, we demonstrated the performance of the position-sensitive detector with very low material thickness.
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Unveiling the electromagnetic structure and intrinsic dynamics of spin-3/2 hidden-charm pentaquarks: A comprehensive QCD analysis
2025, 49(10): 103106. doi: 10.1088/1674-1137/ade95aIn this study, we investigate the electromagnetic properties
$ - $ specifically, the magnetic dipole, electric quadrupole, and magnetic octupole moments$ - $ of six hidden-charm pentaquark states:$ [u u][d c] \bar c $ ,$ [dd][u c] \bar c $ ,$ [u u][s c] \bar c $ ,$ [dd] [s c] \bar c $ ,$ [s s][u c] \bar c $ , and$ [s s][d c] \bar c $ . Employing the framework of QCD light-cone sum rules and utilizing two distinct diquark-diquark-antiquark interpolating currents, we focus on pentaquark configurations with spin-parity quantum numbers$ \rm{\mathit{J}}^{\rm{\mathit{P}}}=3/2^- $ . The numerical results demonstrate significant deviations between the magnetic dipole moments predicted using different diquark-diquark-antidiquark structures. These results suggest that multiple pentaquark states with identical quantum numbers and quark constituents may exhibit distinct magnetic dipole moments, depending on their internal quark configurations. The obtained electromagnetic moments, particularly the variations in magnetic dipole moments, may provide insights into the internal structure of hidden-charm pentaquark states.
Just Accepted
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Evaluation of the moments of inertia of forced split fragments for nuclei 232Th (n,f) and 238U (n,f)
Published: 2025-09-30
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Anisotropic quark propagation and Zeeman effect in an external magnetic field
Published: 2025-09-29
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3H and 3He nuclei production in a combined thermal and coalescence framework for heavy-ion collisions in the few-GeV energy regime
Published: 2025-09-29
Recent
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Investigation of cluster states around 20Ne including spin-orbit coupling and its extension to heavier nuclei
2025, 49(12): 124103-124103-10. doi: 10.1088/1674-1137/adf317Show AbstractClustering, as a fundamental dynamical feature existing widely in many-body systems, has aroused tremendous interest in nuclear physics over the last few decades. The α-cluster concept has been used successfully to describe the energy spectra and electromagnetic transitions for a series of nuclei above the doubly magic core. In the present study, we have systematically investigated the spectroscopic properties of three-nucleon and α-cluster states in 19F and 21Ne within the binary cluster-core model (BCM) plus the extra spin-orbit potential. The calculated energy levels and electromagnetic transition strengths, with few exceptions, are in good agreement with experimental data, confirming the reliability and integrity of BCM. Furthermore, such a BCM is extended to the case of cluster states approaching shell closures in heavier nuclei, such as 43Sc, 59Cu, and 93Mo, leading to satisfactory reproductions and predictions on energy levels and reduced transition rates. It is expected that the present study can provide further insight into the cluster degrees of freedom in odd-A nuclei.
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Theoretical study of Strong gravitational lensing around Dyonic ModMax black hole: constraints from EHT observations
2025, 49(12): 125102-125102-10. doi: 10.1088/1674-1137/adf4a0Show AbstractIn this study, we investigate the properties of the Dyonic ModMax black hole solution using strong gravitational lensing. Additionally, we calculate the time delay between two relativistic images of a background object. First, we analyze expressions for the photon orbits in the spacetime of the Dyonic ModMax black hole. To obtain observational consequences, we provide expressions for the observable quantities, such as angular radius and magnifications. The numerous observations suggest that many nearby galaxies contain supermassive central black holes. In our model, such a supermassive black hole can be characterized by two additional parameters: γ and Q. Notably, the bending angle
$ \alpha_D(b) $ and the angular position$ \theta_\infty $ decrease with increasing charge of the black hole Q, while the parameter γ displays opposite behavior to that of Q. By using observational data of supermassive black holes$ \mathrm{SgrA}^* $ and$ \mathrm{M}87^* $ , we obtain constraints for these parameters. -
Refinement of an analytical capture cross section formula
2025, 49(12): 124106-124106-8. doi: 10.1088/1674-1137/adfe53Show AbstractAn analytical formula with high accuracy is proposed for a systematic description of the capture cross sections at near-barrier energies from light to superheavy reaction systems. Based on the empirical barrier distribution method, three key input quantities are refined by introducing nuclear surface correction to the Coulomb parameter z for calculating the barrier height, incorporating the reaction Q-value and shell correction into the barrier distribution width calculations, and considering the deep inelastic scattering effects of superheavy systems on the barrier radius. With these refinements, the accuracy of not only the calculated barrier height but also the predicted capture cross sections is substantially improved. The average deviation (in logarithmic scale) between the predicted cross sections and the experimental data for 426 reaction systems with
$ 35 < Z_1 Z_2 < 2600 $ is sharply reduced from 3.485 to 0.113.
Archive
ISSN 1674-1137 CN 11-5641/O4
Original research articles, Ietters and reviews Covering theory and experiments in the fieids of
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Cover Story
- Cover Story (Issue 9, 2025): Precise measurement of χc0 resonance parameters and branching fractions of χc0,c2→π+π-/ K+K-
- Cover Story (Issue 8, 2025) A Novel Perspective on Spacetime Perturbations: Bridging Riemannian and Teleparallel Frameworks
- Cover Story (Issue 7, 2025) Evidence of the negative parity linear chain states in 16C
- 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