## 2024 Vol. 48, No. 3

Display Method: |

2024, 48(3): 033101. doi: 10.1088/1674-1137/ad13f6

**Abstract:**

We study the decays of

*T*-odd observables are identified. We discuss the possible effects of new physics (NP) and find that the

*T*-odd observables are sensitive to them as they vanish in the standard model. Special attention is given to the interference of (pseudo)scalar operators with (axial)vector operators in polarized

2024, 48(3): 033102. doi: 10.1088/1674-1137/ad1a98

**Abstract:**

We present a complete study on the

2024, 48(3): 033103. doi: 10.1088/1674-1137/ad102b

**Abstract:**

In the standard model QCD Lagrangian, a term of

*CP*violating gluon density is theoretically expected to have a physical coefficient

*CP*problem. To solve this puzzle in an appealing context of two Higgs doublets, we propose a

*CP*problem can be allowed near the TeV scale.

2024, 48(3): 033104. doi: 10.1088/1674-1137/ad181c

**Abstract:**

In this study, we apply the QCD sum rules to investigate the vector fully-light tetraquark states with an explicit

*P*-wave between the diquark and antidiquark pairs. We observed that the

*P*-wave are approximately

2024, 48(3): 033105. doi: 10.1088/1674-1137/ad13f5

**Abstract:**

In the low energy realization of the quirk assisted Standard Model, the couplings between the exotic particles "quirks" and gauge bosons may contribute to the

*W*mass and muon

*W*-boson mass increment strictly constrains the mixing and coupling parameters and the quirk mass

2024, 48(3): 033106. doi: 10.1088/1674-1137/ad1b3d

**Abstract:**

A new method based on the maximum entropy principle for reconstructing the parton distribution function (PDF) from moments is proposed. Unlike traditional methods, the new method does not require any artificial assumptions. For the case of moments with errors, we introduce Gaussian functions to soften the constraints of moments. Through a series of tests, the effectiveness and reconstruction efficiency of this new method are evaluated comprehensively, demonstrating that this method is reasonable and can achieve high-quality reconstruction with at least the first six moments as input. Finally, we select a set of lattice quantum chromodynamics (QCD) results regarding moments as input and provide reasonable reconstruction results for the pion.

2024, 48(3): 033107. doi: 10.1088/1674-1137/ad1cdb

**Abstract:**

An analytical study with respect to the nonlinear corrections for the nuclear gluon distribution function in the next-to-leading order approximation at small

*x*is presented. We consider the nonlinear corrections to the nuclear gluon distribution functions at low values of

*x*and

*x*and an increase in atomic number A.

2024, 48(3): 034001. doi: 10.1088/1674-1137/ad1678

**Abstract:**

The elastic scattering angular distributions of

2024, 48(3): 034002. doi: 10.1088/1674-1137/ad1a0a

**Abstract:**

The ground-state mass excess of the

*B*

*ρ*-defined isochronous mass spectrometry method at the cooler storage ring in Lanzhou. The new mass excess value allowed us to determine the excitation energies of the two low-lying

*ab initio*valence-space in-medium similarity renormalization group calculations with four sets of interactions derived from the chiral effective field theory. The mechanism leading to the large mirror energy differences is investigated and attributed to the occupation of the

2024, 48(3): 034003. doi: 10.1088/1674-1137/ad147e

**Abstract:**

A study of the inelastic scattering of neutrons with an energy of

*γ*-quanta emitted by the studied nuclei due to neutron-induced nuclear reactions using the tagged neutron method. Two types of detector systems were used to register

*γ*-quanta. The

*γ*-ray yields were measured using a high-purity germanium (HPGe) detector. The angular distributions of

*γ*-rays were obtained using a system of 18 scintillation detectors based on bismuth germanite Bi

*γ*-radiation accompanying the inelastic scattering of neutrons with an energy of

2024, 48(3): 034101. doi: 10.1088/1674-1137/ad181b

**Abstract:**

Recent measurements of the two neutrino double beta decay high precision electron spectra, combined with charge exchange or

*β*-decay experimental data, have revealed severe constraints across current nuclear many body calculations. Our calculations show that the quasi-particle random phase approximation (QRPA) approach can adequately reproduce the measured spectra for the two open shell nuclei,

2024, 48(3): 034102. doi: 10.1088/1674-1137/ad18d2

**Abstract:**

Wobbling motion in a system comprising a triaxial rotor and a single quasiparticle is studied employing the particle-rotor model. The energy spectra, wobbling frequencies, electromagnetic transition probabilities,

*g*-factors, angular momentum components, spin coherent state maps, and static quadrupole moments are investigated. These investigations were conducted with regard to the Fermi surface transitioning from the lowest

2024, 48(3): 034103. doi: 10.1088/1674-1137/ad1582

**Abstract:**

Recently, the synthesis of new elements above

*Z*= 118 has been a hot topic in nuclear physics. Meanwhile, the

*α*-decay chain is expected to be the unique tool to identify these heaviest nuclei. We have systematically calculated the

*α*-decay energies and half-lives on the same footing for superheavy nuclei (SHN) within the cluster model along with a slightly modified Woods-Saxon (W.S.) potential as the nuclear potential. Based on the available experimental data, the key radius parameter (

*R*) in the

*α*-core potential is determined via the systematic trend from the

*α*-decay and isotopic chains. The

*α*-decay energy (

*Z*≤ 120, during which the decay width is obtained using a new treatment for the asymptotic behavior of the

*α*-core wave function. The theoretical values and experimental data are found to be in excellent agreement for the nuclei

*R*parameter. Predicting the

*α*-decay chains for new elements

*Z*= 119 and

*Z*= 120 can be useful in ongoing or forthcoming experiments.

2024, 48(3): 034104. doi: 10.1088/1674-1137/ad1a97

**Abstract:**

A new empirical formula for the astrophysical

*S*-factor has been suggested as a function of the Coulomb interaction parameter, center of mass energy, and barrier height. About 22 fusion reactions with

^{40,48}Ca as projectiles were considered for different targets, leading to compound nuclei with atomic and mass numbers varying between 40

*S*-factor. This study's findings showed better agreement with those of available experiments when compared to Wong's formula. The present work leads to a smaller standard deviation value than Wong's formula when used to correlate the experimental data of calcium-induced fusion reactions. Wong's formula provides a good approximation of fusion cross-sections when the center of mass energy is below the fusion barrier when compared to above the fusion barrier.

2024, 48(3): 034105. doi: 10.1088/1674-1137/ad18d3

**Abstract:**

We investigate the effects of the

*σ*meson mass (

*R*), which are all dependent on the symmetry energy, contribute to determining

*R*) increase with the increase in

2024, 48(3): 034106. doi: 10.1088/1674-1137/ad1b3e

**Abstract:**

In this study, we utilize the complexity-action duality to study the evolution of complexity in a holographic QCD model at finite temperature and chemical potential. By inserting a fundamental string as a probe, we investigated the properties of complexity growth in this Einstein-Maxwell-scalar gravity system, which is affected by the string velocity, chemical potential, and temperature. Our results show that the complexity growth is maximized when the probe string is stationary, and it decreases as the velocity of the string increases. When the string approaches relativistic velocities, the complexity growth always increases monotonically with respect to the chemical potential. Furthermore, we find that the complexity growth can be used to identify phase transitions and crossovers in the model.

2024, 48(3): 034107. doi: 10.1088/1674-1137/ad1925

**Abstract:**

Key nuclear inputs for the astrophysical

*r*-process simulations are the weak interaction rates. Consequently, the accuracy of these inputs directly affects the reliability of nucleosynthesis modeling. The majority of the stellar rates, used in simulation studies are calculated by invoking the Brink-Axel (BA) hypothesis. The BA hypothesis assumes that the strength functions of all parent excited states are the same as for the ground state, only shifted in energies. However, the BA hypothesis has to be tested against microscopically calculated state-by-state rates. In this project, we study the impact of the BA hypothesis on calculated stellar

*Z*,

*A*] ≤ [82, 208]). The calculations were performed using the deformed proton-neutron quasiparticle random-phase approximation (

*pn*-QRPA) model with a simple plus quadrupole separable and schematic interaction. Waiting-point and several key

*r*-process nuclei lie within the considered mass region of the nuclear chart. We computed electron capture and

^{11}, 30]). Our results show that the BA hypothesis invoked U1F

2024, 48(3): 034108. doi: 10.1088/1674-1137/ad1d4b

**Abstract:**

In this study, a microscopic shell-model description of the low-lying collective states in the weakly deformed nucleus

*γ*, and

*β*quasibands is obtained without the adjustable kinetic energy term. Furthermore,

*γ*degrees of freedom are shown to play a crucial role in the description of spectroscopy of this nucleus. A modified

*γ*-unstable type of odd-even staggering, observed experimentally between the states of the quasi-

*γ*band. The current approach enables the characterization of observed intraband and interband quadrupole collectivity. The findings of this study propose an alternative interpretation of the fundamental question regarding the nature of low-energy vibrations, as well as the emergence of deformation and collectivity in weakly deformed atomic nuclei.

2024, 48(3): 035101. doi: 10.1088/1674-1137/ad1a0c

**Abstract:**

General relativity has been very successful since its proposal more than a century ago. However, various cosmological observations and theoretical consistency still motivate us to explore extended gravity theories. Horndeski gravity stands out as one attractive theory by introducing only one scalar field. Here we formulate the post-Newtonian effective field theory of Horndeski gravity and investigate the conservative dynamics of inspiral compact binary systems. We calculate the leading effective Lagrangian for a compact binary and obtain the periastron advance per period. In particular, we apply our analytical calculation to two binary systems, PSR B 1534+12 and PSR J0737-3039, and constrain the relevant model parameters. This theoretical framework can also be systematically extended to higher orders.

2024, 48(3): 035102. doi: 10.1088/1674-1137/ad1ed8

**Abstract:**

Black holes (BHs) exhibiting coordinate singularities but lacking essential singularities throughout the spacetime are referred to as regular black holes (RBHs). The initial formulation of RBHs was presented by Bardeen, who considered the Einstein equation coupled with a nonlinear electromagnetic field. In this study, we investigate the gravitational perturbations, including the axial and polar sectors, of the Bardeen (Anti-) de Sitter black holes. We derive the master equations with source terms for both axial and polar perturbations and subsequently compute the quasinormal modes (QNMs) through numerical methods. For the Bardeen de Sitter black hole, we employ the 6th-order WKB approach. The numerical results reveal that the isospectrality is broken in this case. Conversely, the QNM frequencies are calculated using the HH method for the Bardeen Anti-de Sitter black hole.

**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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