Highlights
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Resonance of hypernuclei with complex momentum representation
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
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
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.
Just Accepted
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Black holes in general relativity coupled with nonlinear electrodynamics surrounded by perfect fluid dark matter: Thermodynamics, particle motion and black hole shadow
Published: 2025-03-31
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Note on single-trace EYM amplitudes with MHV configuration
Published: 2025-03-31
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Relativistic Hartree-Fock model for axial-symmetric nuclei with quadruple and octupole deformations
Published: 2025-03-30
Recent
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Model for Glauber-type calculations of beam fragmentation at low energies
2025, 49(5): 054106-054106-7. doi: 10.1088/1674-1137/adb2fcShow AbstractIn this study, a Glauber-type model for describing nuclear fragmentation in light targets at energies below 100
$A\cdot$ MeV is presented. It is developed based on the Glauber model within the nucleon transparent limit, in which the Lorentz-invariant phase space factor is introduced to account for energy and momentum conservation. Accordingly, the scope of the applicability of the model is discussed. The longitudinal momentum distributions of the most neutron-rich nuclei (10Be, 9Li, and 8He), which were produced in a few nucleon removal reactions during the 11B fragmentation of a Be target at beam energies of 10, 30, and 100$A\cdot$ MeV, are calculated. The results of the calculations are then compared to the predictions of statistical fragmentation models, such as the Goldhaber model. Using the new model, the asymmetric longitudinal momentum distributions at low energies are explained by the kinematical locus and geometry of the reaction. -
Neutrino observables in gauged
${\boldsymbol U({\bf 1})_{\boldsymbol L_{\boldsymbol\alpha}- {\boldsymbol L}_{\boldsymbol\beta}} }$ models with two Higgs doublet and one singlet scalars2025, 49(5): 053003-053003-11. doi: 10.1088/1674-1137/adabceShow AbstractWe discuss neutrino sector in models with two Higgs doublet and one singlet scalar fields under local$ U(1)_{L_\alpha- L_\beta} $ symmetry. A neutrino mass matrix is formulated for these models via a type-I seesaw mechanism by introducing right-handed neutrinos. The neutrino mass matrix has more degrees of freedom than minimal scenarios that have only one new scalar field, but its structure is still restricted by symmetry. Subsequently, we find that the sum of neutrino mass can be lower than that of minimal scenarios and easily satisfies observed constraints. In addition, we can fit neutrino data for$ U(1)_{L_e - L_{\mu(\tau)}} $ cases that are disfavored in minimal models. Furthermore, some correlations among sum of neutrino mass and CP violating phases are still observed, although we have more free parameters. -
Effect of nucleus deformation on final-state flow harmonics
2025, 49(5): 054110-054110-13. doi: 10.1088/1674-1137/adb306Show AbstractIn this study, we explore the effect of the deformation of nuclei on collective flow in relativistic heavy-ion collisions. The parameter associated with the geometrical deformation in the Glauber model is tuned to reproduce the empirical multiplicity probability distributions correctly. Subsequently, the particle spectra and collective flows for Au+Au and U+U collisions are evaluated using a hybrid hydrodynamic code CHESS. We analyze the effects of the degrees of freedom associated with the initial conditions on the final-state flow harmonics by exploring the parameter space of U+U collisions. The connection between the deformation parameters, specifically
$ \beta_2 $ and$ \beta_4 $ , and the flow anisotropies is scrutinized. In particular, deviations in elliptic flow at$ p_{\mathrm{T}}\sim 2 $ GeV are observed at smaller values of$ \beta_2 $ in Au+Au collisions. In contrast, for U+U collisions, the averaged overall flow harmonics are found to be less sensitive to geometrical parameters. Despite the difference in model specifications, our findings largely confirm those obtained in previous studies employing different approaches, which indicate that flow harmonics can be used as a sensible probe for initial geometry fluctuations and to discriminate between different theoretical models.
Current Issued
2025 Vol. 49, No. 4
Published: 28 March 2025
Published: 28 March 2025
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IF: 3.6
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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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