Catálogo de publicaciones - revistas

<jats:title>Abstract</jats:title> <jats:p>Scrupulous theoretical study of <jats:sup>8</jats:sup>Be nucleus states, both clustered and non-clustered, is performed over a wide range of excitation energies. The quantities that characterize the degree of the alpha-clustering of these states, i.e., spectroscopic factors, cluster form factors, and alpha-decay widths, are computed in the framework of the developed accurate ab initio approach. Other basic properties of the <jats:sup>8</jats:sup>Be spectrum, including the binding and excitation energies and the mean values of the isospin, are calculated simultaneously. In the majority of instances, the results of the computation turn out to be in good agreement with the spectroscopic data. A number of predictions are made, and corresponding verification experiments are proposed. Prospects of the developed approach for nuclear spectroscopy are demonstrated. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>By adopting the adiabatic assumption in the cooling process, we discuss a novel mechanism of <jats:inline-formula> <jats:tex-math><?CDATA $ \Upsilon(1S) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_124106_M2.jpg" xlink:type="simple" /> </jats:inline-formula> suppression that occurs due to the fast heating process at the early stage of the fireball, instead of its finite decay width in a finite temperature medium generated by heavy ion collisions. We calculate the transition probability after the fast heating dissociation as a function of the temperature of the medium and the nuclear modification factor in central collisions and find that the suppression is not negligible at RHIC, even if the width of <jats:inline-formula> <jats:tex-math><?CDATA $ \Upsilon(1S) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_124106_M3.jpg" xlink:type="simple" /> </jats:inline-formula> becomes zero. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Fragment production in spallation reactions yields key infrastructure data for various applications. Based on the empirical SPACS parameterizations, a Bayesian-neural-network (BNN) approach is established to predict the fragment cross sections in proton-induced spallation reactions. A systematic investigation has been performed for the measured proton-induced spallation reactions of systems ranging from intermediate to heavy nuclei systems and incident energies ranging from 168 MeV/u to 1500 MeV/u. By learning the residuals between the experimental measurements and SPACS predictions, it is found that the BNN-predicted results are in good agreement with the measured results. The established method is suggested to benefit the related research on nuclear astrophysics, nuclear radioactive beam sources, accelerator driven systems, proton therapy, etc.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>In this work, the characteristics of 2<jats:italic>νββ</jats:italic> decays for six nuclei ( <jats:inline-formula> <jats:tex-math><?CDATA $^{36}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_124108_M2.jpg" xlink:type="simple" /> </jats:inline-formula>Ar, <jats:inline-formula> <jats:tex-math><?CDATA $^{46}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_124108_M3.jpg" xlink:type="simple" /> </jats:inline-formula>Ca, <jats:inline-formula> <jats:tex-math><?CDATA $^{48}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_124108_M4.jpg" xlink:type="simple" /> </jats:inline-formula>Ca, <jats:inline-formula> <jats:tex-math><?CDATA $^{50}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_124108_M5.jpg" xlink:type="simple" /> </jats:inline-formula>Cr, <jats:inline-formula> <jats:tex-math><?CDATA $^{70}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_124108_M6.jpg" xlink:type="simple" /> </jats:inline-formula>Zn, and <jats:inline-formula> <jats:tex-math><?CDATA $^{136}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_124108_M7.jpg" xlink:type="simple" /> </jats:inline-formula>Xe) in a mass range from <jats:inline-formula> <jats:tex-math><?CDATA $A = 36$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_124108_M8.jpg" xlink:type="simple" /> </jats:inline-formula> to <jats:inline-formula> <jats:tex-math><?CDATA $A = 136$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_124108_M9.jpg" xlink:type="simple" /> </jats:inline-formula> are studied within the nuclear shell model (NSM) framework. Calculations are presented for the half-lives, nuclear matrix elements (NMEs), phase space factors ( <jats:inline-formula> <jats:tex-math><?CDATA $G_{2\nu}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_124108_M10.jpg" xlink:type="simple" /> </jats:inline-formula>), and convergence of the NMEs. The theoretical results agree well with the experimental data. In addition, we predict the half-lives of <jats:inline-formula> <jats:tex-math><?CDATA $2\nu\beta\beta$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_124108_M11.jpg" xlink:type="simple" /> </jats:inline-formula> decays for four nuclei. We focus on the convergence of the NMEs by analyzing the number of contributing intermediate <jats:inline-formula> <jats:tex-math><?CDATA $1^{+}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_124108_M12.jpg" xlink:type="simple" /> </jats:inline-formula> states ( <jats:inline-formula> <jats:tex-math><?CDATA $N_{\rm{C}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_124108_M13.jpg" xlink:type="simple" /> </jats:inline-formula>) for the nuclei of interest. We assume that <jats:inline-formula> <jats:tex-math><?CDATA $N_{\rm{C}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_124108_M14.jpg" xlink:type="simple" /> </jats:inline-formula> is safely determined when the accumulated NMEs saturate 99.7% of the final calculated magnitude. From the calculations of the involved nuclei, we discover a connection between <jats:inline-formula> <jats:tex-math><?CDATA $N_{\rm{C}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_124108_M15.jpg" xlink:type="simple" /> </jats:inline-formula> and the total number of intermediate <jats:inline-formula> <jats:tex-math><?CDATA $1^{+}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_124108_M16.jpg" xlink:type="simple" /> </jats:inline-formula> states ( <jats:inline-formula> <jats:tex-math><?CDATA $N_{\rm{T}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_124108_M17.jpg" xlink:type="simple" /> </jats:inline-formula>). According to the least squares fit, we conclude that the correlation is <jats:inline-formula> <jats:tex-math><?CDATA $N_{\rm{C}}=\left( 10.8\pm 1.2\right) \times N_{\rm{T}}^{\left( 0.29\pm 0.02\right)}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_124108_M18.jpg" xlink:type="simple" /> </jats:inline-formula>. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Weakly bound states often occur in nuclear physics. To precisely understand their properties, the coupling to the continuum should be worked out explicitly. As the first step, we use a simple nuclear model in the continuum and on a lattice to investigate the influence of a third particle on a loosely bound state of a particle and a heavy core. Our approach is consistent with the Lüscher formalism.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>We report the dark matter search results obtained using the full 132 ton·day exposure of the PandaX-II experiment, including all data from March 2016 to August 2018. No significant excess of events is identified above the expected background. Upper limits are set on the spin-independent dark matter-nucleon interactions. The lowest 90% confidence level exclusion on the spin-independent cross section is 2.2 × 10<jats:sup>−46</jats:sup> cm<jats:sup>2</jats:sup> at a WIMP mass of 30 GeV/c<jats:sup>2</jats:sup>. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Recently, the non-trivial solutions for 4-dimensional black holes of Einstein-Gauss-Bonnet gravity had been discovered. In this paper, considering a charged particle entering into a 4-dimensional Gauss-Bonnet-Maxwell black hole, we calculate the black hole thermodynamic properties using the Hamilton-Jacobi equation. In the normal phase space, the cosmological constant and Gauss-Bonnet parameter are fixed, the black hole satisfies the first and second laws of thermodynamics, and the weak cosmic censorship conjecture (WCCC) is valid. On the other hand, in the case of extended phase space, the cosmological constant and Gauss-Bonnet parameter are treated as thermodynamic variables. The black hole also satisfies the first law of thermodynamics. However, the increase or decrease in the black hole's entropy depends on some specific conditions. Finally, we observe that the WCCC is violated for the near-extremal black holes in the extended phase space.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>To solve the cosmological constant fine tuning problem, we investigate an (n+1)-dimensional generalized Randall-Sundrum brane world scenario with two <jats:inline-formula> <jats:tex-math><?CDATA $(n-1)$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_125102_M2.jpg" xlink:type="simple" /> </jats:inline-formula>-branes instead of two 3-branes. Adopting an anisotropic metric ansatz, we obtain the positive effective cosmological constant <jats:inline-formula> <jats:tex-math><?CDATA $\Omega_{\rm eff}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_125102_M3.jpg" xlink:type="simple" /> </jats:inline-formula> of order <jats:inline-formula> <jats:tex-math><?CDATA $10^{-124}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_125102_M4.jpg" xlink:type="simple" /> </jats:inline-formula> and only require a solution <jats:inline-formula> <jats:tex-math><?CDATA $\simeq50-80$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_125102_M5.jpg" xlink:type="simple" /> </jats:inline-formula>. Meanwhile, both the visible and hidden branes are stable because their tensions are positive. Therefore, the fine tuning problem can be solved quite well. Furthermore, the Hubble parameter <jats:inline-formula> <jats:tex-math><?CDATA $H_{1}(z)$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_125102_M6.jpg" xlink:type="simple" /> </jats:inline-formula> as a function of redshift <jats:inline-formula> <jats:tex-math><?CDATA $z$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_125102_M7.jpg" xlink:type="simple" /> </jats:inline-formula> is in good agreement with the cosmic chronometers dataset. The evolution of the universe naturally shifts from deceleration to acceleration. This suggests that the evolution of the universe is intrinsically an extra-dimensional phenomenon. It can be regarded as a dynamic model of dark energy that is driven by the evolution of the extra dimensions on the brane. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Global symmetry can guarantee the stability of dark matter particles (DMps). However, the nonminimal coupling between dark matter (DM) and gravity can break the global symmetry of DMps, which in turn leads to their decay. Under the framework of nonminimal coupling between scalar singlet dark matter (ssDM) and gravity, it is worth exploring the extent to which the symmetry of ssDM is broken. It is suggested that the total number of decay products of ssDM cannot exceed current observational constraints. Along these lines, the data obtained with satellites such as Fermi-LAT and AMS-02 suggest that the scale of ssDM global symmetry breaking can be limited. Because the mass of many promising DM candidates is likely to be in the GeV-TeV range, we determine reasonable parameters for the ssDM lifetime within this range. We find that when the mass of ssDM is around the electroweak scale (246 GeV), the corresponding 3σ lower limit of the lifetime of ssDM is <jats:inline-formula> <jats:tex-math><?CDATA $5.3\times10^{26}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_12_125103_M2.jpg" xlink:type="simple" /> </jats:inline-formula> s. Our analysis of ssDM around the electroweak scale encompasses the most abundant decay channels of all mass ranges so that the analysis of the behavior of ssDM under the influence of gravity is more comprehensive. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>According to a corrected dispersion relation proposed in the study on the string theory and quantum gravity theory, the Rarita-Schwinger equation was precisely modified, which resulted in the Rarita-Schwinger-Hamilton-Jacobi equation. Using this equation, the characteristics of arbitrary spin fermion quantum tunneling radiation from non-stationary Kerr-de Sitter black holes were determined. A number of accurately corrected physical quantities, such as surface gravity, chemical potential, tunneling probability, and Hawking temperature, which describe the properties of black holes, were derived. This research has enriched the research methods and enabled increased precision in black hole physics research.</jats:p>