## Just Accepted

Display Method:

Published:

**Abstract:**

This study utilizes the Bayesian neural network (BNN) method in machine learning to learn and predict the cross-section data of

^{28}Si projectile fragmentation for different targets at different energies, and to quantify the uncertainty. The detailed modeling process of BNN is presented, and its prediction results are compared with Cummings, Nilsen, EPAX2, EPAX3, and FRACS models, as well as experimental measurement values. The results reveal that the BNN method achieves the smallest root-mean-square error (RMSE) and the highest agreement with the experimental values compared to other models. Only the BNN method and FRACS model show a significant odd-even staggering effect, but BNN method is more closer to the experimental value. Furthermore, the BNN method is the only model capable of reproducing data features with low cross-section values at Z = 9, and the average ratio of the BNN's predicted to experimental values is close to 1.0. These results demonstrate that the BNN method can accurately reproduce and predict the fragment production cross sections of the

^{28}Si projectile fragmentation, as well as its ability to capture key data characteristics.

Published:

**Abstract:**

The paper reports an analytical formula for the production cross section of

*e*

^{+}

*e*

^{−}annihilation to hadrons in the vicinity of a narrow resonance, particularly in the

*τ*-charm region, while considering initial state radiation. Despite some approximations in its derivation, the comparison between the analytical formula and direct integration of ISR shows good accuracy, indicating that the analytical formula meets current experimental requirements. Furthermore, the paper presents a comparison of the cross section between the analytical formula and calculations using the ConExc Monte Carlo generator. The efficiency of the analytical formula in significantly reducing computing time makes it a favorable choice for the regression procedure to extract the parameters of narrow charmonium resonances in experiments.

Published:

**Abstract:**

The recently discovered satellite dwarf galaxy Ursa Major III provides a promising opportunity to explore the signatures resulting from dark matter (DM) annihilation, due to its proximity and large J-factor. Owing to the absence of an excess of

*γ*-ray signatures originating from Ursa Major III, observations of

*γ*-rays, such as those from Fermi-LAT, can be utilized to set constraints on the DM annihilation cross section. In this study, we determine the DM density profile, and consider the relationship between DM density and velocity dispersion at different locations within Ursa Major III through Jeans analysis. We calculate the J-factor of Ursa Major III for s-wave annihilation, along with the effective J-factors for p-wave and Sommerfeld enhanced annihilation scenarios. Utilizing these derived J-factors, we set stringent constraints on DM annihilation cross sections in three scenarios. Given the substantial impact of member star identification on the J-factor of Ursa Major III, we further calculate J-factors with the condition of excluding the largest velocity outlier. Our analysis reveals a notable reduction in the median value and an increase in the deviation of J-factors, thereby leading to considerably weaker constraints.

Published:

**Abstract:**

We propose searching for dark photon signals in the decay channel of

*η*mesons, specifically through the leptonic decay (

*PbPb*collisions at current and future hadron colliders. Our findings support the potential for detecting dark photon signals at the LHC, High-Luminosity LHC, High-Energy LHC, and the Future Circular Collider.

Published:

**Abstract:**

The neutron total cross-section of

Published:

**Abstract:**

In this paper, we study the optical properties of asymmetric thin-shell wormholes (ATWs) with torsion charge. Utilizing the cut-and-paste method developed by Visser, we construct these wormholes and determine their key physical properties such as the radius of the photon sphere and critical impact parameters under different torsion charges. Furthermore, we investigate the effective potential and the behavior of photon motion within the wormhole spacetime, identifying a relationship between photon trajectories and impact parameters. The study focuses on scenarios where thin accretion disks act as the primary light source. It reveals that the optical features of the ATW with torsion charge significantly differ from those of a black hole (BH). Notably, an increase in the torsion charge leads to a reduction in the sizes of both extra photon rings and lensing bands, which serve as important markers for distinguishing and characterizing ATW spacetimes from BHs.

Published:

**Abstract:**

Excited states of

*n*)

*γ*-

*γ*coincidence measurement, further enriching the level scheme of

Published:

**Abstract:**

An analysis of the off-shell

Published:

**Abstract:**

A method for the treatment of the pairing correlations at finite temperature is proposed within the path integral formalism. It is based on the square root extraction of the pairing term in the Hamiltonian of the system. Gap equations, as well as expressions of the pairing gap parameter Δ, the energy

*E*and the heat capacity

*C*are established. The formalism is first tested using the Richardson model which enables comparison with exact solution. The results obtained using the present formalism are also compared to the Finite Temperature BCS (FTBCS) ones. An improvement compared to the FTBCS model is noted especially at low temperature. Indeed, it is shown that the agreement between the Δ values of the present work and the exact ones is very good at low temperature. This leads to a better agreement between the values of

*E*and

*C*of the present model and the exact values than with the FTBCS values. However, a critical value of the temperature still exists. Realistic cases are then considered using single-particle energies of a deformed Woods-Saxon mean-field for the nuclei

Published:

**Abstract:**

Naked singularities form during the gravitational collapse of inhomogeneous matter clouds. The final nature of the singularity depends on the initial conditions of the matter properties and types of matter profiles. These naked singularities can also be divided into two types: null-like and timelike singularities. The spacelike singularity of the Schwarzschild black hole can be distinguished from the null and timelike naked singularity spacetimes. In light of this, we investigate the precession of timelike bound orbits in the null naked singularity spacetime, as well as tidal force effects and geodesic deviation features. As a result, we find that the orbital precession of the timelike bound orbits in null naked singularity spacetime could be distinguished from the Schwarzschild precession case. The radial component of the tidal force has an intriguing profile, whereas the angular component has a profile which is comparable to that of a Schwarzschild black hole scenario. The geodesic deviation equation is then solved numerically, yielding results that resemble a Schwarzschild black hole. These characteristic features can then be used to discern amongst these singularities.

Published:

**Abstract:**

We calculate the form factor

Published:

**Abstract:**

We are conducting an investigation to explore late-time cosmic acceleration through various dark energy parametrizations (Wettrich, Efstathiou, and Ma-Zhang) within the Horava-Lifshitz gravity framework. As an alternative to general relativity, this theory introduces anisotropic scaling at ultraviolet scales. Our primary objective is to constrain the key cosmic parameters and the Baryon Acoustic Oscillation (BAO) scale, specifically the sound horizon (

*r*) by utilizing 24 uncorrelated measurements of Baryon Acoustic Oscillations (BAO) derived from recent galaxy surveys, span a redshift range from

_{d}*z*= 0.106 to

*z*= 2.33. Additionally, we integrate the most recent Hubble constant measurement by Riess in 2022 (denoted as R22) as an extra prior. For Wettrich, Efstathiou, and Ma-Zhang, our analysis of Baryon Acoustic Oscillation (BAO) data yields sound horizon results of

*r*=148.1560 ± 2.7688 Mpc,

_{d}*r*=148.6168 ± 10.2469 Mpc, and

_{d}*r*=147.9737 ± 10.6096 Mpc, respectively. Incorporating the R22 prior into the BAO dataset results in

_{d}*r*=139.5806 ± 3.8522 Mpc,

_{d}*r*=139.728025 ± 2.7858 Mpc, and

_{d}*r*=139.6001 ± 2.7441 Mpc. These outcomes highlight a distinct inconsistency between early and late observational measurements, analogous to the

_{d}*H*

_{0}tension. A notable observation is that, when we don't include the R22 prior, the outcomes for

*r*tend to be in agreement with Planck and SDSS results. Following this, we conducted the Cosmography test and presented a comparative study of each parametrization within the ΛCDM paradigm. Our diagnostic analyses demonstrate that all models fit seamlessly within the phantom region. All dark energy parametrizations predict an Equation of State parameter close to

_{d}
Published:

**Abstract:**

In this work, considering the preformation factor of the emitted two protons in parent nucleus

**47**, 025102 (2020)] to systematically study the

*σ*= 0.683. For comparison, the Gamow-like model (GLM) proposed by Liu

*et al*. [Chin. Phys. C

**45**, 044110 (2021)], the generalized liquid drop model (GLDM) proposed by Cui

*et al*. [Phys. Rev. C

**101**, 014301 (2020)], effective liquid drop model (ELDM) proposed by M. Gonalves

*et al*. [Phys. Lett. B

**774**, 14 (2017)], the two-potential approach with Skyrme-Hartree-Fock (TPASHF) proposed by Pan

*et al*. [Chin. Phys. C

**45**, 124104 (2021)], the phenomenological model with a screened electrostatic barrier (SEB) propoesed by Zou

*et al*. [Chin. Phys. C

**45**, 104101 (2021)], the unified fission model (UFM) proposed by Xing

*et al*. [Chin. Phys. C

**45**, 124105 (2021)],the Coulomb and proximity potential model for deformed nuclei (CPPMDN) proposed by Santhosh [Phys. Rev. C

**104**, 064613 (2021)], a two-parameter empirical formula proposed by Liu

*et al*. [Chin. Phys. C

**45**, 024108 (2021)], and a four-parameter empirical formula proposed by Sreeja

*et al*. [Eur. Phys. J. A

**55**, 33 (2019)] are also used. In addition, we use this model to predict the

Published:

**Abstract:**

In this paper, we research into the anomalous Chromomagnetic Dipole Moment (CMDM), denoted as

*B*, and the heavy bosons

Published:

**Abstract:**

The transverse momentum distributions of charged hadrons produced in proton-proton collisions at center-of-mass energies (

*T*), non-extensivity parameter (

*q*), and kinetic freezeout volume (

*V*). Additionally, the mean transverse momentum and the initial temperature of the particle source are determined through the fit function and the string percolation method, respectively. An alternative method is employed to calculate the kinetic freezeout temperature and transverse flow velocity from the

*T*. Furthermore, thermodynamic quantities at the freezeout, including energy density (

*ε*), particle density (

*n*), entropy density (

*s*), pressure (

*P*), and squared speed of sound (

*T*and

*q*.It is also observed that, with a decrease in pseudorapidity, all thermodynamic quantities, except the

*V*and

*q*, increase. This trend is attributed to greater energy transfer along the mid pseudorapidity.

*q*increases towards higher values of pseudorapidity, indicating that particles close to the beam axis are far from equilibrium. The

*V*, however, remains nearly independent of pseudorapidity. The excitation function of these parameters (

*q*) shows a direct (inverse) correlation with collision energy. The

*ε*,

*n*,

*s*, and

*P*show a strong dependence on collision energies at low pseudorapidities. Explicit verification of the thermodynamic inequality

Published:

**Abstract:**

We investigate the soft behavior of the tree-level Rutherford scattering processes mediated via

*t*-channel one-graviton exchange. We consider two types of Rutherford scattering processes,

*e.g*., a low-energy massless structureless projectile (up to spin-1) hits a static massive composite particle carrying various spins (up to spin-2), and a slowly-moving light projectile hits a heavy static composite target. The unpolarized cross sections in the first type are found to exhibit universal forms at the first two orders in

Published:

**Abstract:**

The inner fission barriers of the even-even uranium isotopes from the proton to the neutron drip line are studied with the deformed relativistic Hartree-Bogoliubov theory in continuum. A periodic-like evolution for the ground state shapes is shown with the neutron number, i.e., spherical shapes at shell closures

*r*-process nucleosynthesis.

Published:

**Abstract:**

The decay of Higgs boson into two spin-1/2 particles provides an ideal system to reveal quantum entanglement and Bell-nonlocality. Future

*Z*boson in the production of

Published:

**Abstract:**

A method based on the dinuclear system (DNS) has been proposed to describe the angular distribution of products in multinucleon transfer (MNT) reactions. Taking into account fluctuation effects, the angular distributions of reactions involving

^{136}Xe+

^{208}Pb,

^{136}Xe+

^{209}Bi,

^{86}Kr+

^{166}Er,

^{ 84}Kr+

^{209}Bi, and

^{84}Kr+

^{208}Pb have been studied, demonstrating a good agreement with experimental data. Moreover, the double differential cross-sections (

^{136}Xe+

^{208}Pb and

^{136}Xe+

^{209}Bi has been analyzed to explore the mechanism of angular distribution in MNT reactions. Additionally, the optimal angles for detecting the

*N*=126 isotopes have been determined through an analysis of the influence of the proton and neutron numbers of the projectiles on the angular distribution of the

*N*=126 isotopic line. The results of this study could provide valuable insights for experimental detection.

Published:

**Abstract:**

We investigate the inelastic signatures of dark matter-nucleus interactions, explicitly focusing on the ramifications of polarization, dark matter splitting, and the Migdal effect. Direct detection experiments, crucial for testing the existence of dark matter, encounter formidable obstacles such as indomitable neutrino backgrounds and the elusive determination of dark matter spin. To overcome these challenges, we explore the potential of polarized-target dark matter scattering, examining the impact of nonvanishing mass splitting and the role of the Migdal effect in detecting dark matter. Our analysis demonstrates the valuable utility of the polarized triple-differential event rate as an effective tool for studying inelastic dark matter. It enables us to investigate both angular and energy dependencies, providing valuable insights into the scattering process.

Published:

**Abstract:**

We present the angular distribution of the four-fold

Published:

**Abstract:**

In this work, our goal is to construct inverse potentials for various

*?*-channels of neutron-proton scattering using piece-wise smooth Morse function as a reference. The phase equations for single-channel states and the coupled ones of multi-channel scattering have been solved numerically using the Runge-kutta 5

^{th}order method. We employ a piece-wise smooth reference potential comprising three Morse functions as initial input. Leveraging a machine learning-based Genetic Algorithm, we optimize the model parameters to minimize the mean-squared error between simulated and anticipated phase shifts. Remarkably, our approach yields inverse potentials for both single and multi-channel scattering, achieving a convergence to a mean-squared error of

*r*' for

*r*], are found to be [5.445(5.424), 1.770(1.760)]

Published:

**Abstract:**

Accurate cross sections of neutron induced fission reactions are required in the design of advanced nuclear systems and in the development of fission theory. The time projection chamber (TPC), with its track reconstruction and particle identification capabilities, is supposed to be the best detector for high-precision fission cross section measurements. The TPC developed by the back-streaming white neutron source (Back-n) team of China Spallation Neutron Source (CSNS) was used as the fission fragment detector in the measurement. In the present work, the cross sections of the

^{232}Th(

*n*,

*f*) reaction at five neutron energies in the 4.50 ~ 5.40 MeV region were measured. The fission fragments and α particles could be well identified using our TPC, which leads to higher detection efficiency of the fission fragments and smaller uncertainty of the measured cross sections. Our work is the first measurement of

^{232}Th(

*n, f*) reaction using the TPC for the detection of fission fragments. With uncertainties smaller than 5%, the present cross sections are consistent with the data in different evaluation libraries including JENDL-4.0, ROSFOND-2010, CENDL-3.2, ENDF/B-VIII.0 and BROND-3.1, whose uncertainties can be reduced after future improvements of the measurement.

Published:

**Abstract:**

By varying the intrinsic initial geometry, the p/d/

^{3}He+Au collisions at the Relativistic Heavy Ion Collider (RHIC) provide a unique opportunity to understand the collective behavior and probe the possible sub-nucleon fluctuations in small systems. In this paper, we employ the hybrid model

^{3}He+Au collisions. With fine-tuned parameters,

Published:

**Abstract:**

In this work, we study masses and decays of triply-heavy pentaquarks

Published:

**Abstract:**

We investigate the bound-state equations in two-dimensional QCD in the

Published:

**Abstract:**

We investigate the soft behavior of the tree-level Rutherford scattering process. We consider two types of Rutherford scattering, a low-energy massless point-like projectile (say, a spin-

Published:

**Abstract:**

We study the isotropization process of Bianchi-I space-times in the Horndeski theory with

Published:

**Abstract:**

In this paper we consider a nonsingular two-field bounce scenario with non-minimal kinetic coupling between two scalar fields. We derive the constraints on the model parameters from the finiteness of the physical quantities at the classical level and from the relation between the late-time accelerated expansion and particle production up to the bounce phase. We then determine the allowed parameter space for the model.

Published:

**Abstract:**

This manuscript aims to study cosmic warm inflation (WI) in the framework of

*Q*represents the nonmetricity (NM) scalar. To accomplish this task, we introduce the Tsallis, Renyi, and Barrow holographic dark energy (HDE) entropies into the standard Friedmann equations. Utilizing the slow-roll (SR) approximation, we find exact analytic solutions for the inflaton field, the effective potential necessary to produce inflation, and the scale factor for both low and high-dissipative regimes. We calculate key parameters, including SR parameters, the number of e-folds, the scalar spectral index and its running, and finally tensor-to-scalar ratio to assess the accuracy of the chosen DE models in light of the published observational data. The allowed ranges of the involved free parameters are found from the limits on inflationary observables imposed by the Planck data. It is concluded that the obtained results are consistent with proposed theoretical predictions up to

Published:

**Abstract:**

We study the Einstein images of a charged Rastall AdS black hole (BH) within the fabric of AdS/CFT correspondence. Considering the holographic setup, we analyze the amplitude of the total response function for various values of model parameters. With an increase in parameter

*λ*and temperature

*T*, the amplitude of the response function is decreased, while it is increased with the increase of the electric charge

*e*and chemical potential

*μ*. The influence of frequency

*ω*also plays an important role in the bulk field, as it is found that the decreasing

*ω*leads to an increase in the periods of the waves, which means that the amplitude of the response function also depends on the wave source. The relation between

*T*to the inverse of the horizon

*λ*is interpreted under fixed values of other involved parameters. These, in turn, affect the behavior of the response function and the Einstein ring, which may be used to differentiate the present work from previous studies. Via a special optical system, we construct the holographic images of the BH in bulk. These results show that the Einstein ring always appears with concentric stripes at the position of the north pole, and this ring transforms into the luminosity-deformed ring or bright light spot when the distant observer lies away from the north pole. Finally, we finish this work with a discussion of the influence of the associated parameters on the Einstein ring radius, which is consistent with wave optics.

Published:

**Abstract:**

The spin characteristics of black holes offer valuable insights into the evolutionary pathways of their progenitor stars, crucial for understanding the broader population properties of black holes. Traditional Hierarchical Bayesian inference techniques employed to discern these properties often entail substantial time investments, and consensus regarding the spin distribution of Binary Black Hole (BBH) systems remains elusive. In this study, leveraging observations from GWTC-3, we adopt a machine learning approach to infer the spin distribution of black holes within BBH systems. Specifically, we develop a Deep Neural Network (DNN) and train it using data generated from a Beta distribution. Our training strategy, involving the segregation of data into 10 bins, not only expedites model training but also enhances the DNN's versatility and adaptability to accommodate the burgeoning volume of gravitational wave observations. Utilizing Monte Carlo-bootstrap (MC-bootstrap) to generate observation-simulated samples, we derive spin distribution parameters:

Published:

**Abstract:**

Traditionally ones look at the cosmological constant as the dark energy which mimics matter with negative energy. Since matter with negative energy provides a repulsive force which is totally different from usual gravitational forces, ones believe the cosmological constant will effectively contribute a repulsive force. However we have to notice that the concept of gravitational force is valid only in the Newtonian dynamics viewpoint. We will show that the aforementioned traditional understanding about the gravitational force contributed by the cosmological constant is not completely correct in the current paper. Our strategy is investigating the Newtonian limit of Einstein equation with a cosmological constant. The involved subtleties are discussed in detail. We interestingly find that the effect of the cosmological constant on the Newtonian gravity theory is an attraction force instead of a repulsive force for usual matters. As ones expected, such correction force is ignorably small. But ideally our findings can be used to distinguish dark energy and cosmological constant, because one contributes a repulsive force while the other contributes an attractive force.

Published:

**Abstract:**

**Background:**The search of the heavier elements has yielded many surprises and enhanced our knowledge in the direction of nuclear synthesis and associated dynamical aspects. Although new elements and their associated isotopes have been synthesized, the amount of information with the Z ≥ 102, remains somewhat scarce. Further, in the domain of transfermium elements, the nuclear shell structure is of significant relevance for ensuring nuclear stability. Hence, the shell effects become indispensable for such nuclei.

**Purpose:**Persistent experimental and theoretical endeavors have been conducted to examine the reactions induced by heavy ions and the subsequent decay mechanisms in the realm of superheavy mass. In addition, the region of transfermium elements is itself of great interest because of the neutron / proton shell effects. Here, Our objective is to analyze the subsequent decay mechanisms of nuclides of

*Z*= 102 nucleus, i.e.

^{248}

*No*

^{*}and

^{250}

*No*

^{*}.

**Methods:**An extensive study is conducted using the dynamical cluster-decay model (DCM) based on Quantum Mechanical Fragmentation Theory (QMFT). The focus is on investigating compound nucleus (CN) and non-compound nucleus (nCN) mechanisms, including fusion-fission (ff), Quasi fission (QF), and fast fission (FF). The specific isotopes of interest are

^{248}

*No*

^{*}and

^{250}

*No*

^{*}, with attention given to the role of centre of mass energy

*P*) uses a function that is dependent upon the center of mass energy. The lifetimes of the fusion-fission (ff) quasi fission (QF) channels are also investigated.

_{CN}**Results:**Here, CN and nCN decay mechanisms for two isotopes of

*Z*=102 nobelium are analysed over the range of centre-of-mass

*P*to determine the mechanisms of decay of

_{CN}^{248}

*No*

^{*}and

^{250}

*No*

^{*}isotopes. The fusion-fission lifetimes and quasi fission lifetimes are compared with the dinuclear system (DNS) approach.

**Conclusions:**Among the considered isotopes of

*Z*= 102 i.e.,

^{248}

*No*

^{*}formed in

^{40}

*Ca*+

^{208}

*Pb*reaction and

^{250}

*No*

^{*}via to different entrance channels

^{44}Ca+

^{206}Pb and

^{64}Ni+

^{186}W show asymmetric fragmentation with the effect of

^{122}

*Sn*and

^{128}

*Te*are observed near the magic shell closure

*Z*= 50 and

*N*= 82. As the excitation energy increases, the lifetime of fusion-fission and quasi fission decreases.

Published:

**Abstract:**

This study examines the properties of heavy quarkonia

*X*by treating them as bound states of

*Q*and

*Q*represents either a charm or a bottom quark. The branching ratios for the radiative leptonic decays

*X*. Furthermore, we apply Lorentz transformations from the rest frame of

*X*to the center-of-mass frame of

*X*states, such as

Published:

**Abstract:**

In this study, we introduce a novel approach in quantum field theories to estimate the action using the artificial neural networks (ANNs). The estimation is achieved by learning on system configurations governed by the Boltzmann factor,

Published:

**Abstract:**

We operated a p-type point contact high purity germanium (PPCGe) detector (CDEX-1B, 1.008 kg) in the China Jinping Underground Laboratory (CJPL) for 500.3 days to search for neutrinoless double beta (

^{76}Ge. A total of 504.3 kg

^{76}Ge

**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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