Impact factor of Chinese Physics C is 3.6 in 2023 Impact factor of Chinese Physics C is 3.6 in 2022 2021 Impact Factor 2.944
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  • Resonance of hypernuclei with complex momentum representation
    Hantao Zhang, Chao-Feng Chen, Xian-Rong Zhou, Zhongzhou Ren
    2025, 49(4): 044101. doi: 10.1088/1674-1137/ad9a8c
    By combining the Skyrme-Hartree-Fock method with complex momentum representation (CMR), the resonant states of $ {}^{17}_\Lambda $O, $ {}^{41}_{\Lambda} $Ca, $ {}^{49}_{\Lambda} $Ca, and $ {}^{57}_\Lambda $Ni were investigated. The phase shifts for hyperon-nucleus elastic scattering were determined with continuum level density (CLD), and the scattering length as well as the resonance energy were obtained by utilizing the effective range expansion. Our method, abbreviated as CMR-CLD, exhibits good consistency with traditional approaches and provides ground work for investigating scattering and resonance problems in deformed and multi-hyperon hypernuclei.
  • Inferring a spinning black hole in an expanding universe via the S2 star around the galactic center
    Jin-Tao Yao, Xin Li
    2025, 49(4): 045106. doi: 10.1088/1674-1137/ad9304
    The nearest black hole to Earth, Sagittarius A$ ^\star $ (Sgr A$ ^\star $), with its intense gravitational field, provides a unique opportunity to explore black hole mysteries. Over the past few decades, monitoring of the S2 star has provided extensive valuable data that can be utilized to examine various gravity theories and black hole paradigms. This paper focuses on the most intriguing objects in astronomy, spinning black holes, and investigates the effects of spin on orbital motion. By applying the Markov Chain Monte Carlo algorithm to publicly available observational data of the S2 star, our findings indicate that current data fail to constrain the spin of Sgr A$ ^\star $. Simulated stars with smaller semi-major axes reveal that the direction of Lense-Thirring precession aligns with the spin direction of Sgr A$ ^\star $. Additionally, by incorporating the cosmological constant, which accounts for the expansion of the universe, into our analysis, we establish an upper limit of $ \Lambda \lesssim 7.3 \times 10^{-34} \text{ km}^{-2} $ on the cosmological constant at the $ 1\sigma $ confidence level. Future long-term monitoring of S-cluster stars, combined with enhanced observational precision, may enable the determination of the spin of Sgr A$ ^\star $ and further tighten the bound on the cosmological constant.
  • An empirical formula of nuclear β-decay half-lives with the transition-strength contribution
    Lei Tian, Wei-Feng Li, Ji-Yu Fang, Zhong-Ming Niu
    2025, 49(4): 044110. doi: 10.1088/1674-1137/ad9303
    An empirical formula of nuclear β-decay half-lives is proposed by including the transition-strength contribution. The inclusion of the transition-strength contribution can reduce nuclear β-decay half-lives by about an order of magnitude, and its effect gradually increases toward the neutron-rich or heavy nuclear regions. For nuclear β-decay half-lives less than 1 s, the empirical formula can describe the experimental data within approximately2 times, which is more accurate than the sophisticated microscopic models. The transition-strength contribution can also be effectively considered by refitting the parameters of other empirical formulas without the transition-strength term although they will still significantly deviate from the new empirical formula in light or heavy neutron-rich nuclear regions. This indicates that the inclusion of the transition-strength contribution in the empirical formula is crucial for the global description of nuclear β-decay half-lives. The extrapolation ability of the new empirical formula was verified by the newly measured β-decay half-lives.
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  • Collective impact of higher-order deformations of target nuclei on the fusion dynamics of heavy-ion induced reactions
    Harshit Sharma, Raj Kumar, Manoj K. Sharma
    2025, 49(6): 064110-064110-12. doi: 10.1088/1674-1137/adbace
    Show Abstract
    Several studies on fusion reaction dynamics focused on the impact of quadrupole $\beta_2^{\pm}$ deformation. However, existing literature highlights the importance of the octupole $\beta_3^{\pm}$ and hexadecapole $\beta_4^{\pm}$ deformations associated with both the projectile and target nuclei. However, the collective influence of these deformations ($\beta_2$, $\beta_3$, and $\beta_4$) on the fusion reaction dynamics has not been examined explicitly. In this study, we investigated the collective influence of higher-order deformations up to $\beta_4$ on the barrier characteristics, in particular $V_B$, $R_B$, and $\hbar\omega$, and their impact on the fusion cross-sections of heavy-ion induced reactions in the mass range $163\leq{ {A}}\leq182$. The reactions were examined at both compact and elongated configurations of the deformed nuclei. Heavy ion-induced reactions, which consist of target nuclei with higher-order deformations up to $\beta_4$, reveal a notable alteration in the barrier characteristics $V_B$ and $R_B$, along with a significant change in orientation $\theta_i$ for both compact and elongated configurations. In addition, the incorporation of deformations up to $\beta_4$ and their corresponding orientations $\theta_i$ contributes to enhanced capture cross-sections $\sigma_{cap}$ as well as integrated cross-sections $\sigma_{int.}$, resulting in better agreement with experimental data for $^{16}{\rm{O}}$-induced reactions with $^{148}{\rm{Nd}}$, $^{149-150}{\rm{Sm}}$, and $^{32}{\rm{S}}$-induced reactions with $^{150}{\rm{Sm}}$. We conclude that the incorporation of deformations of all orders up to $\beta_4$ at their optimized compact and elongated configurations is essential because it provides better outcomes compared to the optimized configurations of $\beta_2$ and $\beta_3$ deformed nuclei.
  • Electron-ion collision spectroscopy at the CRYRING@ESR electron cooler
    C. Brandau, S. Fuchs, V. Hannen, E. O. Hanu, C. Krantz, M. Lestinsky, M. Looshorn, E. B. Menz, S. X. Wang, S. Schippers
    2025, 49(6): 064001-064001-9. doi: 10.1088/1674-1137/adbf81
    Show Abstract
    Electron-ion collision spectroscopy at heavy-ion storage rings aims at precision measurements of resonance features that occur in the cross sections of electron collision processes such as electron-impact ionization of ions or electron-ion recombination. As part of the international Facility for Antiproton and Ion Research (FAIR) project, the low-energy ion storage ring CRYRING@ESR has been coupled with the heavy-ion accelerators operated by the GSI Helmholtz Center for Heavy-Ion Research in Darmstadt, Germany. This has created a new opportunity for stringent strong field quantum electrodynamics tests through electron-ion collision spectroscopy of heavy few-electron ions. The present contribution provides details of the electron-ion collision spectroscopy setup at CRYRING@ESR and associated data-analysis procedures along with first results for nonresonant and resonant recombination of berylliumlike lead ions. A recombination rate enhancement factor of 3.5 was observed for nonresonant recombination at zero electron-ion collision energy. For resonant recombination excellent agreement with recent theoretical results was obtained when these were shifted by 340 meV in energy.
  • Lattice QCD study of ΛcΛc scattering
    Hanyang Xing, Yiqi Geng, Chuan Liu, Liuming Liu, Peng Sun, Jiajun Wu, Zhicheng Yan, Ruilin Zhu
    2025, 49(6): 063107-063107-8. doi: 10.1088/1674-1137/adc11f
    Show Abstract
    We present the first lattice result of the near threshold $ \Lambda_c\Lambda_c $ scattering with $ I(J^P) = 0(0^+) $. The calculation is performed on two $ N_f = 2+1 $ Wilson-Clover ensembles with pion mass $ m_\pi \sim 303 $ MeV and lattice spacing $ a = 0.07746 $ fm. Lüscher's finite volume method is utilized to extract the scattering parameters from the finite-volume spectrum. The coupled channel $ \Xi_{cc}N $ is ignored in the scattering analysis based on the observation that the energy levels computed from the $ \Lambda_c\Lambda_c $ and $ \Xi_{cc}N $ operators do not mix. The $ \Sigma_c\Sigma_c $ channel is not included either since the energy range explored in this study is well below its threshold. Our results indicate that the interaction in the $ \Lambda_c\Lambda_c $ single channel is repulsive, and the scattering length is determined to be $ a_0 = -0.21(4)(8) $ fm, where the first error is statistical and the second is systematic.
Current Issued
Chinese Physics C
2025 Vol. 49, No. 4
Published: 28 March 2025
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Chinese Physics C
IF: 3.6

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ISSN 1674-1137 CN 11-5641/O4

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