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<jats:title>Abstract</jats:title> <jats:p>The shadow and observation intensity of a black hole surrounded by a thin spherical accretion in the Randall–Sundrum brane world model are investigated. The bulk metric depends on the tidal charge parameter, <jats:italic>q</jats:italic>, and deformation parameter, <jats:italic>C</jats:italic>. It reduces to the metric that possesses similar form with the Reissner–Nordström metric if <jats:inline-formula> <jats:tex-math><?CDATA $ C=0 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_7_075103_M1.jpg" xlink:type="simple" /> </jats:inline-formula>. It is shown that the radius of the photon sphere of this black hole depends only on the tidal charge parameter. The radius of the photon sphere decreases with higher <jats:italic>q</jats:italic>. The observation intensity is mainly influenced by the tidal charge parameter, <jats:italic>q</jats:italic>, and the deformation parameter, <jats:italic>C</jats:italic>, is of secondary importance. In the optical observation, the black holes appear brighter with higher <jats:italic>q</jats:italic> or lower <jats:italic>C</jats:italic>. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Experimentally measured neutron activation cross sections are presented for the <jats:inline-formula> <jats:tex-math><?CDATA $ ^{65} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_7_079001_M1.jpg" xlink:type="simple" /> </jats:inline-formula>Cu(<jats:italic>n</jats:italic>, <jats:italic>α</jats:italic>) <jats:inline-formula> <jats:tex-math><?CDATA $ ^{62m} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_7_079001_M2.jpg" xlink:type="simple" /> </jats:inline-formula>Cu, <jats:inline-formula> <jats:tex-math><?CDATA $ ^{41} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_7_079001_M3.jpg" xlink:type="simple" /> </jats:inline-formula>K(<jats:italic>n</jats:italic>, <jats:italic>α</jats:italic>) <jats:inline-formula> <jats:tex-math><?CDATA $ ^{38} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_7_079001_M4.jpg" xlink:type="simple" /> </jats:inline-formula>Cl, and <jats:inline-formula> <jats:tex-math><?CDATA $ ^{65} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_7_079001_M5.jpg" xlink:type="simple" /> </jats:inline-formula>Cu(<jats:italic>n,2n</jats:italic>) <jats:inline-formula> <jats:tex-math><?CDATA $ ^{64} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_7_079001_M6.jpg" xlink:type="simple" /> </jats:inline-formula>Cu reactions with detailed uncertainty propagation. The neutron cross sections were measured at an incident energy of 14.92 <jats:inline-formula> <jats:tex-math><?CDATA $ \pm $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_7_079001_M7.jpg" xlink:type="simple" /> </jats:inline-formula> 0.02 MeV, and the neutrons were based on the <jats:italic>t</jats:italic>(<jats:italic>d</jats:italic>, <jats:italic>n</jats:italic>)<jats:italic>α</jats:italic> fusion reaction. The <jats:inline-formula> <jats:tex-math><?CDATA $ ^{27} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_7_079001_M8.jpg" xlink:type="simple" /> </jats:inline-formula>Al(<jats:italic>n</jats:italic>, <jats:italic>α</jats:italic>) <jats:inline-formula> <jats:tex-math><?CDATA $ ^{24} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_7_079001_M9.jpg" xlink:type="simple" /> </jats:inline-formula>Na reaction was used as a reference reaction for the normalization of the neutron flux. The pre-calibrated lead-shielded HPGe detector was used to detect the residues' <jats:italic>γ</jats:italic>-ray spectra. The data from the measured cross sections are compared to the previously measured cross sections from the EXFOR database, theoretically calculated cross sections using the TALYS and EMPIRE codes, and evaluated nuclear data. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Heavy Majorana neutrinos beyond the standard model can simultaneously explain the origin of tiny neutrino masses and matter-antimatter asymmetry in our Universe. The existence of heavy Majorana neutrinos will also lead to lepton number violation and the rare lepton-number-violating W decays are possible. With contributions from two different Majorana neutrinos, a nonzero CP asymmetry may be generated from the rate difference between W decay and its CP-conjugate process. The aim of this paper is to investigate the prospects for measuring CP violation in rare W decays via Majorana neutrinos at the LHC. Our calculations show that the induced CP asymmetry is independent of the Majorana neutrino mass for 10 GeV &lt; m<jats:sub>N</jats:sub> &lt; 70 GeV. Such a CP asymmetry if observed, would in turn provide unambiguous evidence of new physics beyond the standard model. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>In this paper we study formulas of the number of states with given total spin I and isospin T, for n nucleons in a single-j shell, denoted by D<jats:sub>IT</jats:sub> (j, n). The Talmi's recursion formulas for the number of states with given z-axis projection of total spin are generalized by further considering the isospin couplings, and are applied to derive explicit formulas of D<jats:sub>IT</jats:sub> (j, n).</jats:p>

<jats:title>Abstract</jats:title> <jats:p>In this article we obtain wormhole solutions in the recently proposed extension of symmetric teleparallel gravity called $f(Q,T)$ gravity. Here, the gravitational Lagrangian $L$ is defined by an arbitrary function $f$ of $Q$ and $T$ (where $Q$ is the non-metricity scalar, while $T$ is the trace of the energy-momentum tensor). In this study, we obtain the field equations for a static spherically symmetric wormhole metric in the context of a general $f(Q,T)$ gravity. We study the wormhole solutions with (i) linear EoS and (ii) anisotropy relation. We adopt two different forms of $f(Q,T)$ (a) linear $f(Q,T)=\alpha Q+\beta T$ and (b) non-linear $f(Q,T)=Q+\lambda Q^2+\eta T$ to investigate these solutions. We investigate the various energy conditions to look for preservation and violation among the solutions that we obtained. We find that NEC is violated in both cases of our assumed forms of $f(Q,T)$. Finally, we perform the stability analysis using Tolman-Oppenheimer-Volkov (TOV) equation.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>Various Higgs factories are proposed to study the Higgs boson precisely and systematically in a model-independent way. In this study, the Particle Flow Network and ParticleNet techniques are used to classify the Higgs decays into multi-categories and the ultimate goal is to realize an ``end-to-end'' analysis. A Monte Carlo simulation study is performed to demonstrate the feasibility, and the performance looks rather promising. This result could be the basis of a ``one-shop" analysis to measure all the branching fractions of the Higgs decays simultaneously. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>The isomeric ratio of <jats:sup>184m, g</jats:sup>Re and the half-life of <jats:sup>184g</jats:sup>Re were measured in the <jats:sup>185</jats:sup>Re (n, 2n) <jats:sup>184</jats:sup>Re reaction at 14.8 MeV, as well as the uncertainty was discussed in detail. The measurements were performed by the activation method implemented for the rhenium sample using the K-400 neutron generator at the Chinese Academy of Engineering Physics (CAEP). Isomeric state and ground state nuclei of <jats:sup>184</jats:sup>Re were identified by their γ-ray spectra. In order to eliminate the effect of the γ-ray emitted from the isomer on the counting of the ground state characteristic peak, the isomeric ratio of <jats:sup>184m, g</jats:sup>Re was calculated to be 0.29 ± 0.11 according to the neutron activation cross-section formula. This result is consistent with previous data within the uncertainty, whereby it can be used to determine parameters that characterize the dependence of the level density on the excitation energy and angular momentum. Through exponential function fitting and a detailed discussion of the uncertainty evaluation, the new recommended half-life of <jats:sup>184g</jats:sup>Re was determined as 35.43 ± 0.16 d, which was consistent with the currently recommended value, however, the uncertainty assessment of the latter was barely documented. In addition, this work indicates that the half-life of the ground state can be obtained by eliminating the contamination of the γ-rays emitted from the isomer, which provides the possibility to determine the half-lives of nuclides containing isomers.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>In the present work, we systematically study the α decay half-lives of uranium (Z=92) isotopes based on Gamow model with a screened electrostatic barrier. There are only two adjustable parameters in our model i.e. the parameter g and the screening parameter t in Hulthen potential for considering the screened electrostatic effect of Coulomb potential. The calculated results are in good agreement with the experimental data while the corresponding root-mean-square (rms) deviations of uranium isotopes with α transition orbital angular momentum l=0 and l=2 are 0.141 and 0.340, respectively. Moreover, we extend this model to predict α decay half-lives of uranium isotopes whose α decay is energetically allowed or observed but not yet quantified in NUBASE2020. For comparison, the modified Hatsukawa formula (XLZ), the unified Royer formula (DZR), the universal decay law (UDL) and the Viola-Seaborg-Sobiczewski formula (VSS) are also used. The predictions are basically consistent with each other. Meanwhile, the results also indicate that N=126 shell closure is still robust at Z=92 and the spectroscopic factor Sα is almost the same for uranium isotopes with the same l.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>Color screening and parton inelastic scattering modify the heavy-quark antiquark potential in the medium that consists of particles from quantum chromodynamics (QCD), leading to suppression of quarkonium production in relativistic heavy-ion collisions. Due to small charm/anti-charm ($c\bar{c}$) pair production number in proton-nucleus (pA) collisions, the correlation between different $c\bar{c}$ pairs is negligible, which makes the Schr\"odinger equation viable for tracking the evolution of only one $c\bar{c}$ pair. We employ the time-dependent Schr\"odinger equation with in-medium $c\bar{c}$ potential to study the evolution of charmonium wave functions in the hydrodynamic like QCD medium produced in pA collisions. We explore different parametrizations of real and imaginary parts of $c\bar{c}$ potential and calculate the nuclear modification factors ($R_{\rm pA}$) of $J/\psi$ and $\psi(2S)$ in $\sqrt{s_{NN}}=5.02$ TeV energy p-Pb collisions at Large Hadron Collider (LHC). Comparing a strong and a weak screening scenario with experimental data in this approach, we arrive at the conclusion that the color screening is weak at temperature close to deconfined phase transition. Moreover, the imaginary part of the potential is crucial to describe the experimental data which is consistent with widely studied semi-classical approaches where the dissociation rates are essential.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>The integrated luminosities of the XYZ data samples collected in 2016--2017 at center-of-mass energies between 4.19 and 4.28 GeV are measured with a precision better than 1% by analyzing large-angle Bhabha scattering events. The integrated luminosities of the data sets collected in 2010--2014 are updated by considering an additional correction related to the detector performance. These results are essential for precision measurements of the production cross sections of the charmonium and charmonium-like states.</jats:p>