Highlights
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Octupole correlations in stable nucleus 153Eu within reflection-asymmetric particle rotor model
2025, 49(1): 014103. doi: 10.1088/1674-1137/ad78d6
The observed low-lying$K=5/2^\pm$ positive- and negative-parity bands in the stable nucleus 153Eu are investigated using the reflection-asymmetric triaxial particle rotor model. The experimental energy spectra, energy staggering parameters, and intraband$E2$ and$M1$ transition probabilities are well reproduced. The calculated interband$B(E1)$ values are found to depend sensitively on the octupole deformation parameter$\beta_{30}$ , although the energy spectra and intraband$E2$ and$M1$ transitions can be reproduced without the octupole degree of freedom. The observed enhanced$E1$ transition probabilities can be reproduced with$\beta_{30}=0.05$ . The detailed analysis of the intrinsic wave functions shows these nearly degenerate positive- and negative-parity bands are built on two individual proton configurations, i.e., dominated by$\pi g_{7/2}[\Omega=5/2]$ and$\pi h_{11/2}[\Omega=5/2]$ , respectively, which differs from the parity doublet bands built on a single parity-mixed configuration. -
Measurement of the integrated luminosity of data samples collected during 2019-2022 by the Belle II experiment
2025, 49(1): 013001. doi: 10.1088/1674-1137/ad806c
A series of data samples was collected with the Belle II detector at the SuperKEKB collider from March 2019 to June 2022. We determine the integrated luminosities of these data samples using three distinct methodologies involving Bhabha ($e^+e^- \to e^+e^-(n\gamma)$ ), digamma ($e^+e^- \to \gamma\gamma(n\gamma)$ ), and dimuon ($e^+e^- \to \mu^+ \mu^- (n\gamma)$ ) events. The total integrated luminosity obtained with Bhabha, digamma, and dimuon events is (426.88 ± 0.03 ± 2.61) fb−1, (429.28 ± 0.03 ± 2.62) fb−1, and (423.99 ± 0.04 ± 3.83) fb−1, where the first uncertainties are statistical and the second are systematic. The resulting total integrated luminosity obtained from the combination of the three methods is (427.87 ± 2.01) fb−1. -
Holographic bottom-up approach to Σ baryons
2025, 49(1): 013104. doi: 10.1088/1674-1137/ad7d75
In this study, we discuss the description of neutral Σ baryons with$ I(J^P)=1(1/2^+) $ and$ I(J^P)=1(3/2^+) $ using two bottom-up approaches: the deformed background and static dilaton models. In both models, we consider a non-linear Regge trajectory extension motivated by the strange nature of Σ baryons. We find that both models describe these systems with an RMS error smaller than 10%. We also perform a configurational entropy calculation in both models to discuss hadronic stability.
Just Accepted
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Application of the Woods-Saxon potential in studying quadrupole and octupole excited states using machine learning
Published: 2025-01-15
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One-loop analytical expressions for gg/γγ → ϕiϕj in Higgs Extensions of the Standard Models and its applications
Published: 2025-01-15
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Constraints on branes' geometry from massive vector KK modes
Published: 2025-01-15
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Revisiting the alpha-decay reduced width of the lightest uranium isotope 214U
2025, 49(3): 034105-034105-8. doi: 10.1088/1674-1137/ad9302Show AbstractThe lightest uranium isotope
$ {\rm^{214}U} $ has been produced at the Heavy Ion Research Facility in Lanzhou, China. The α-decay reduced width ($ \delta^{2} $ ) of$ {\rm^{214}U} $ has been found to be significantly larger than those of other nuclei by a factor of 2. However, the extraction of$ \delta^{2} $ depends on the penetration probability (P) through the barrier, and P is related to the theoretical method of obtaining it and the form of the α-core potential. The aim of this study is to investigate whether the selections of the α-core potential and the method of calculating P can affect the above conclusion. Four different phenomenological α-core potentials and two microscopic double-folding potentials, together with the Wentzel-Kramers-Brillouin (WKB) approximation and transfer matrix (TM) approach, are used to obtain P. The value of P obtained using the WKB approximation is about 20%−40% smaller than the one obtained using the TM approach. Thus, the deduced$ \delta^{2} $ is overestimated. The choice of α-core potential can significantly affect the value of$ \delta^{2} $ . With the spherical form for the α-core potentials, the$ \delta^{2} $ of$ {\rm^{214}U} $ obtained with both the WKB and TM approaches are about twice as large as those of the surrounding nuclei. With the deformed double-folding potential, the ratio between$ \delta^{2} $ of$ {\rm^{214}U} $ and that of the surrounding nuclei is observed to be slightly below 2. The effects of nuclear deformation and the α-core potential should be considered when studying the α-decay reduced width in the$ N_{p}N_{n} $ systematics. -
Layout optimization and performance analysis of large array of imaging atmospheric Cherenkov telescopes
2025, 49(3): 035001-035001-10. doi: 10.1088/1674-1137/ad8e3fShow AbstractThe large array of imaging atmospheric Cherenkov telescopes (LACT) is a planned array of 32 Cherenkov telescopes, each featuring 6-m diameter mirrors, to be constructed at the LHAASO site. This study focused on optimizing the array layout and analyzing the performance of LACT. Two observation modes were examined: large zenith angle observations for ultra-high energy events and small zenith angle observations for lower energy thresholds. For large zenith angles (60°), simulations indicate that an 8-telescope subarray can achieve an effective area of
$ 3 \; \rm km^2 $ with excellent angular resolution. For small zenith angles, we optimized the layout of 4-telescope cells and the full 32-telescope array. The energy threshold of the full array is approximately 200 GeV, which is particularly crucial for studying transient phenomena such as gamma-ray bursts (GRBs) and active galactic nuclei (AGNs). This study provides essential guidance for finalizing the LACT layout design and estimating performance under various observational conditions. It also highlights the potential of LACT for conducting deep observations of ultra-high energyγ-ray sources, performing morphological studies of PeVatrons, and advancing time-domain γ-ray astronomy. -
Universal thermodynamic relations with constant corrections for five-dimensional de Sitter spacetime
2025, 49(3): 035106-035106-9. doi: 10.1088/1674-1137/ad9d1eShow AbstractIn this study, we built upon the method proposed by Goon and Penco for analyzing the universality of thermodynamic relations with corrections in de Sitter (dS) black holes. Additionally, based on our analysis of non-linear magnetically charged black holes in dS spacetime, five-dimensional dS hairy spacetime, and five-dimensional charged-dS rotating black holes, we demonstrate the universality of thermodynamic relations in dS black holes. This establishes a universal conjecture relating shifted thermodynamic quantities for arbitrary black-hole backgrounds. We consider that these universal relations will offer new insights into the realm of quantum gravity.
Current Issued
2025 Vol. 49, No. 1
Published: 27 December 2024
Published: 27 December 2024
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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
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- Particle and nuclear astrophysics
- Cosmology
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Cover Story
- 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
- Cover Story (Issue 9, 2024) Measurement of solar pp neutrino flux using electron recoil data from PandaX-4T commissioning run
- Cover Story (Issue 11, 2024) ｜ Form factor for Dalitz decays from J/ψ to light pseudoscalars
- Cover Story (Issue 3, 2024) | First measurement of the ground-state mass of 22Al helps to evaluate the ab-initio theory
- Cover Story (Issue 2, 2024) | Quark/gluon taggers light the way to new physics
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