Chinese Physics C

Highlights

Stable circular orbits and greybody factor of Hayward-Letelier-AdS black holes
Allah Ditta, Sulaman Shaukat, Faisal Javed, Abdelmalek Bouzenada, G. Mustafa, Bander Almutairi

2025, 49(11): 115104. doi: 10.1088/1674-1137/ade4a7

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This paper explores the dynamical feature of Hayward-Letelier black holes in AdS spacetime, emphasizing the effects of the Hayward parameter g, mass M, cosmological constant L, and modification parameter α on their geometry, thermodynamics, and observational features. By utilizing an effective potential method, we investigate the paths of particles, innermost stable circular orbit, and behavior of photon spheres, which connects them to the appearance of black hole shadows. Thermodynamic features such as Hawking temperature and entropy are studied for investigating the effect of L and thermal fluctuations on the stability of black holes. These discoveries connect theoretical ideas with observational astrophysics, which enhances our comprehension of ordinary black holes in AdS models. In this study, we analytically compute the greybody factor for a massless scalar field propagating in the vicinity of a black hole under the assumption of weak coupling to gravity. We investigate the behavior of the effective potential concerning the black hole's mass and charge, revealing that it reaches its maximum at lower values of the cloud of strings parameter. Our results indicate that the radial absorption rate of the scalar field exhibits significant fluctuations, which is influenced by the charge of the black hole and clouds of string, with implications for the dynamics of scalar fields in strong gravitational fields.
Sensitivity study of the tau lepton electric dipole moment at the Super Tau-Charm Facility
Xulei Sun, Yongcheng Wu, Xiaorong Zhou

2025, 49(11): 113001. doi: 10.1088/1674-1137/adf6e0

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This study investigates the intrinsic electric dipole moment (EDM) of the τ lepton, which is an important quantity in the search for physics beyond the Standard Model (BSM). In preparation for future measurements at the Super Tau-Charm Facility (STCF), we employ Monte Carlo simulations of the $ e^+e^- \rightarrow \tau^+\tau^- $ process and optimize the analysis methodology for EDM extraction. Machine learning techniques are implemented to efficiently identify signal events ($ \tau^\pm\rightarrow \pi^\pm\pi^0\nu_\tau $), which result in a significant improvement in signal-to-noise ratio. Our optimized event selection algorithm achieves 80.0% signal purity with 6.3% efficiency. We develop an analytical approach for τ lepton momentum reconstruction and derive the squared spin density matrix along with optimal observables, which maximize the sensitivity to $ d_\tau $. The relationship between these observables and the EDM is established with the estimated sensitivity of $ |d_\tau| < 3.89\times 10^{-18}\,e\cdot\mathrm{cm} $ at a 68% confidence level. These results provide a foundation for future experimental measurements of the τ lepton EDM in STCF experiments.
Measurement of separate electron and positron spectra from 10 to 20 GeV with the geomagnetic field on DAMPE
F. Alemanno, Q. An, P. Azzarello, F. C. T. Barbato, P. Bernardini, X. J. Bi, H. V. Boutin, I. Cagnoli, M. S. Cai, E. Casilli, E. Catanzani, J. Chang, D. Y. Chen, J. L. Chen, Z. F. Chen, Z. X. Chen, P. Coppin, M. Y. Cui, T. S. Cui, Y. X. Cui, I. De Mitri, F. de Palma, A. Di Giovanni, T. K. Dong, Z. X. Dong, G. Donvito, J. L. Duan, K. K. Duan, R. R. Fan, Y. Z. Fan, F. Fang, K. Fang, C. Q. Feng, L. Feng, J. M. Frieden, P. Fusco, M. Gao, F. Gargano, E. Ghose, K. Gong, Y. Z. Gong, D. Y. Guo, J. H. Guo, S. X. Han, Y. M. Hu, G. S. Huang, X. Y. Huang, Y. Y. Huang, M. Ionica, L. Y. Jiang, Y. Z. Jiang, W. Jiang, J. Kong, A. Kotenko, D. Kyratzis, S. J. Lei, M. B. Li, W. H. Li, W. L. Li, X. Li, X. Q. Li, Y. M. Liang, C. M. Liu, H. Liu, J. Liu, S. B. Liu, Y. Liu, F. Loparco, C. N. Luo, M. Ma, P. X. Ma, T. Ma, X. Y. Ma, G. Marsella, M. N. Mazziotta, D. Mo, Y. Nie, X. Y. Niu, A. Parenti, W. X. Peng, X. Y. Peng, C. Perrina, E. Putti-Garcia, R. Qiao, J. N. Rao, Y. Rong, R. Sarkar, P. Savina, A. Serpolla, Z. Shangguan, W. H. S

2025, 49(11): 115001. doi: 10.1088/1674-1137/adfa04

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The cosmic-ray (CR) electrons and positrons in space are of considerable significance for studying the origin and propagation of CRs. The satellite-borne detector Dark Matter Particle Explorer (DAMPE) has been used to measure the separate electron and positron spectra, as well as the positron fraction. In this study, the Earth's magnetic field is used to distinguish CR electrons and positrons, as the DAMPE detector does not carry an onboard magnet. The energy for the measurements ranges from 10 to 20 GeV, which is currently limited at high energy by the zenith-pointing orientation of DAMPE. The results are consistent with previous measurements based on the magnetic spectrometer by AMS-02 and PAMELA, whereas the results of Fermi-LAT appear to be systematically shifted to larger values.

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Discovery Prospects for a Leptophilic Gauge Boson Z_ℓ at CEPC and ILC
S.O. Kara

Published: 2025-11-23

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Published: 2025-11-23

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Particle-number conserving analysis of the πd_5/2 band in ^{117,119,121,123,125}Cs
Qing-Qing Zhang, Anshul Dadwal, Xiao-Tao He

Published: 2025-11-23

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Published: 2025-11-23

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Hyperons in neutron-star cores: confronting maximum mass observational constraint of 2M_⊙
Anuj Sharma, Mukul Kumar, Raj K. Jagota, Shashi K. Dhiman

Published: 2025-11-23

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Published: 2025-11-23

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Alpha-decay systematics and a new scaling law in heavy and superheavy nuclei
Hisham Anwer, A. R. Abdulghany

2026, 50(1): 014111-014111-16. doi: 10.1088/1674-1137/ae0307

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This paper presents a systematic investigation of α-decay properties in even-even isotopic chains of Po ($ Z=84 $), Cm ($ Z=96 $), Hs ($ Z=108 $), and Fl ($ Z=114 $) using a semi-classical approach. Ground-state properties, including binding energies and nucleon density distributions, are calculated by minimizing a Skyrme-based energy density functional augmented with microscopic corrections. The derived nuclear densities and $ Q_\alpha $-values are used to construct the α decay potential through the double-folding model (DFM). The α-decay dynamics are treated quantum mechanically based on the preformed cluster model (PCM) within the Wentzel-Kramers-Brillouin (WKB) approximation. The analysis reveals distinct signatures of spherical shell closures at $ N=126 $ and $ N=184 $, along with secondary anomalies near $ N = 148 $, $ 152 $, and $ 162 $, which are consistent with deformed sub-shell effects predicted by nuclear structure models. The signature of daughter nuclear stability is systematically observed through one or more of the following features: shortened α-decay half-lives, enhanced $ Q_\alpha $ values, increased penetrabilities, and/or reduced assault frequencies. A new universal scaling relation, relating the decay half-lives and a scaled combination of nuclear charge and decay energy, is established, showing strong correlation across a wide mass range. Systematic comparisons demonstrate particular predictive advantages for superheavy nuclei, with the proposed method accurately reproducing observed half-life variations across all isotopic chains. The results confirm the sensitivity of α-decay observables to both spherical and deformed shell effects and reinforce the role of α-decay systematics as powerful tools for probing nuclear structure and guiding predictions in unexplored regions of the nuclear chart.

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Erratum and Addendum: Improvement of nuclear semi-empirical mass formula by including shell effect (Chin. Phys. C, 49(11): 114103 (2025))
Qing Wu, Wei-Feng Li, Zhong-Ming Niu, Hao-Zhao Liang, Min Shi

2025, 49(12): 129001-129001-1. doi: 10.1088/1674-1137/ae23a6

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Cross section measurement of the ⁶Li(n,t)⁴He reaction in the MeV neutron energy range
Yu. M. Gledenov, I. Chuprakov, Guohui Zhang, G. Khuukhenkhuu, M. Odsuren, B. Usukhbayar, L. Krupa, E. Sansarbayar, Jie Liu, Haofan Bai, Cong Xia, Zepeng Wu, Wenkai Ren, D. Berikov, G. Ahmadov, A. K. Bekbayev, B. Mukhametuly, E. S. Korshikov, N. T. Temerbulatova, E. B. Myrzabekova, O. Daulbayev, Y. Arynbek

2025, 49(12): 124004-124004-8. doi: 10.1088/1674-1137/ae0306

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Cross sections of the ⁶Li(n, t)⁴He reaction were measured in the fast neutron energy range from 3.3 to 5.3 MeV using a gridded ionization chamber (GIC) and well–calibrated experimental setup at the EG–5 Van de Graaff accelerator of the Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research (FLNP, JINR). Lithium fluoride (⁶LiF) samples with varying thicknesses and krypton–CO₂ gas mixtures with different pressures were used to optimize the detection of both alpha particles and tritons. Neutron fluxes were monitored using two high–purity (99.999%) ²³⁸U₃O₈ samples placed inside the GIC, complemented by an externally calibrated ³He long counter. The measured ⁶Li(n, t)⁴He cross–section data were compared with existing results of measurements and evaluations from EXFOR and ENDF nuclear data libraries, and the results showed a good agreement in the measured neutron energy range. These new measurements provide reliable cross–section data that contribute to the refinement of evaluated nuclear data files and support applications in nuclear physics, tritium production, and reactor design.

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Current Issued

2025 Vol. 49, No. 11
Published: 01 November 2025

Particles And Fields
Nuclear Physics
Particle And Nuclear Astrophysics And Cosmology