Chinese Physics C

Highlights

Moments from momentum derivatives in lattice QCD
Zhuoyi Pang, Jian-Hui Zhang, Dian-Jun Zhao

2025, 49(10): 101001. doi: 10.1088/1674-1137/aded04

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We 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
Tetsuaki Moriguchi, Momo Mukai, Naoto Kaname, Akira Ozawa, Shinji Suzuki, Yasushi Abe, Hiroki Arakawa, Tomoya Fujii, Daiki Hamakawa, Sakumi Harayama, Shun Hosoi, Yasuto Inada, Kumi Inomata, Reo Kagesawa, Daisuke Kajiki, Daiki Kamioka, Masanori Kanda, Atsushi Kitagawa, Takaaki Kobayashi, Daisuke Nagae, Sarah Naimi, Kunimitsu Nishimuro, Shunichiro Omika, Misaki Otsu, Mamoru Sakaue, Shinji Sato, Hibiki Seki, Naru Shinozaki, Takeshi Suzuki, Keisuke Tomita, Takayuki Yamaguchi, Yoshitaka Yamaguchi, Asahi Yano, Kenjiro Yokota

2025, 49(10): 104001. doi: 10.1088/1674-1137/ade95b

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We 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.
Unveiling the electromagnetic structure and intrinsic dynamics of spin-3/2 hidden-charm pentaquarks: A comprehensive QCD analysis
Ulaş Özdem

2025, 49(10): 103106. doi: 10.1088/1674-1137/ade95a

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In 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.

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Experimental overview on the charmed baryon decays
Pei-Rong Li, Xiao-Rui Lyu, Yangheng Zheng

Published: 2025-10-19

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Published: 2025-10-19

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Search for the lepton number violating process ${{\boldsymbol J}/{\boldsymbol\psi }{\bf\to}{\boldsymbol K}^{\bf +}{\boldsymbol K}^{\bf +}{\boldsymbol e}^{\bf -}{\boldsymbol e}^{\bf -}{\bf +}{\boldsymbol {c.c.}}}$
M. Ablikim, M. N. Achasov, P. Adlarson, X. C. Ai, R. Aliberti, A. Amoroso, Q. An, Y. Bai, O. Bakina, Y. Ban, H.-R. Bao, V. Batozskaya, K. Begzsuren, N. Berger, M. Berlowski, M. B. Bertani, D. Bettoni, F. Bianchi, E. Bianco, A. Bortone, I. Boyko, R. A. Briere, A. Brueggemann, H. Cai, M. H. Cai, X. Cai, A. Calcaterra, G. F. Cao, N. Cao, S. A. Cetin, X. Y. Chai, J. F. Chang, T. T. Chang, G. R. Che, Y. Z. Che, C. H. Chen, Chao Chen, G. Chen, H. S. Chen, H. Y. Chen, M. L. Chen, S. J. Chen, S. L. Chen, S. M. Chen, T. Chen, X. R. Chen, X. T. Chen, X. Y. Chen, Y. B. Chen, Y. Q. Chen, Z. Chen, Z. K. Chen, J. C. Cheng, L. N. Cheng, S. K. Choi, X. Chu, G. Cibinetto, F. Cossio, J. Cottee-Meldrum, H. L. Dai, J. P. Dai, A. Dbeyssi, R. E. de Boer, D. Dedovich, C. Q. Deng, Z. Y. Deng, A. Denig, I. Denisenko, M. Destefanis, F. De Mori, B. Ding, X. X. Ding, Y. Ding, Y. X. Ding, J. Dong, L. Y. Dong, M. Y. Dong, X. Dong, M. C. Du, S. X. Du, X. L. Du, Y. Y. Duan, Z. H. Duan, P. Egorov, G. F. Fan, J. J. Fan, Y. H. Fan, J. Fang, S.

Published: 2025-10-19

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Published: 2025-10-19

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A Numerical Study on Gauge Symmetry of Electroweak Amplitudes
Wang-Fa Li, Junmou Chen, Qian-Jiu Wang, Zhao-Huan Yu

Published: 2025-10-18

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Published: 2025-10-18

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Investigation of the α-decay half-lives for even-even nuclei within a deformed two-potential approach
Hong-Qiang You, Ren-Hang Wu, Shuang-Shuang Zhang, Xiao-Tao He

2025, 49(12): 124111-124111-8. doi: 10.1088/1674-1137/ae0430

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In this study, we systematically investigate the α-decay half-lives of 195 even-even nuclei using a deformed two-potential approach (TPA). The cosh potential with fixed diffuseness parameter is adopted as the nuclear potential, for which deformation parameters are taken from the FRDM, WS4, and DRHBc models. The root mean square deviation (RMSD) decreases from 0.515 to 0.385, 0.401, and 0.436, respectively, indicating that incorporating nuclear deformations enables the deformed TPA to accurately reproduce experimental α-decay half-lives. Furthermore, by fitting the diffuseness parameter across various mass regions, the RMSD is further reduced, from 0.385 to 0.330, 0.401 to 0.343, and 0.436 to 0.363. Additionally, the deformed TPA, combined with the fitted diffuseness parameter, is extended to predict the α-decay half-lives of even-even nuclei with Z = 118 and 120. The results suggest that N = 184 may be the next neutron magic number, following N = 126.

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Systematic study of α decay half-life within cluster-formation model
Wen-Chao Dai, Jie-Dong Jiang, Yin Fan, Xiao Liu, Peng-Cheng Chu, Xi-Jun Wu, Xiao-Hua Li

2026, 50(1): 014103-014103-26. doi: 10.1088/1674-1137/ae042c

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In this study, based on the Wentzel-Kramers-Brillouin (WKB) theory, by parameterizing the assault frequency $ \nu $ as a function of the $ \alpha $ decay energy and charge radius of parent nucleus, with the $ \alpha $ decay preformation factor $ P_\alpha $ being calculated through the cluster-formation model (CFM), we systematically investigate the $ \alpha $ decay half-lives of 559 nuclei from the ground state, including 177 even-even, 277 odd-A, and 105 odd-odd nuclei. The calculated results indicate that our model can effectively reproduce the experimental data, with a corresponding standard deviation of 0.408. In addition, we use this model to predict the $ \alpha $ decay half-lives of 70 even-even, odd-A, and odd-odd nuclei with Z = 119 and 120. For comparison, we also use the universal decay law (UDL) proposed by Qi et al. [Phys. Rev. Lett 103, 072501 (2009)] and the unitary Royer formula (DZR) proposed by Deng et al. [Phys. Rev. C 101, 034307 (2020)]. The calculated results are in good agreement.

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Development of cesium laser resonance ionization schemes for PLASEN experiment
Yangfan Guo, Zhou Yan, Xiaofei Yang, Shaojie Chen, Wencong Mei, Hanrui Hu, Yinshen Liu, Dongyang Chen, Chen Zhang, Tianxu Gao, Yipin Jing, Yanlin Ye

2025, 49(12): 124002-124002-6. doi: 10.1088/1674-1137/adf49e

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To study the nuclear properties and deformation of neutron-rich cesium isotopes in their ground and isomeric states at the Beijing Rare Isotope Beam Facility (BRIF), optimal resonance ionization schemes and experimental conditions must be predetermined. In this study, we evaluated several three-step laser resonance ionization schemes for cesium atoms by accessing their ionization efficiency and spectral resolution under varying measurement conditions using high-resolution and high-sensitivity collinear resonance ionization spectroscopy system. Hence, we identified the currently most efficient resonance ionization scheme and optimal experimental conditions, achieving an overall measurement efficiency of 1: 400 with a spectral resolution of about 100 MHz. Under this condition, the extracted hyperfine structure parameters of ¹³³Cs showed excellent agreement with previously reported values. This study establishes a solid foundation for the forthcoming online measurement of neutron-rich cesium isotopes at BRIF.

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Current Issued

2025 Vol. 49, No. 10
Published: 25 September 2025

Particles And Fields
Nuclear Physics
Particle And Nuclear Astrophysics And Cosmology