Catálogo de publicaciones - revistas

<jats:title>Abstract</jats:title> <jats:p>The angle-differential cross sections of neutron-induced deuteron production from carbon were measured at six neutron energies from 25 to 52 MeV relative to those of <jats:italic>n</jats:italic>-<jats:italic>p</jats:italic> elastic scattering at the China Spallation Neutron Source (CSNS) Back-n white neutron source. By employing the <jats:italic>Δ</jats:italic> <jats:italic>E</jats:italic>-<jats:italic>E</jats:italic> telescopes of the Light-charged Particle Detector Array (LPDA) system at 15.1° to 55.0° in the laboratory system, ratios of the angle-differential cross sections of the <jats:sup>12</jats:sup>C(<jats:italic>n</jats:italic>, <jats:italic>xd</jats:italic>) reactions to those of the <jats:italic>n</jats:italic>-<jats:italic>p</jats:italic> scattering were measured, and then, the angle-differential cross sections of the <jats:sup>12</jats:sup>C(<jats:italic>n</jats:italic>, <jats:italic>xd</jats:italic>) reactions were obtained using the angle-differential cross sections of the <jats:italic>n</jats:italic>-<jats:italic>p</jats:italic> elastic scattering from the JENDL-4.0/HE-2015 library as the standard. The obtained results are compared with data from previous measurements, all of which are based on mono-energic neutrons, the evaluated data from the JENDL-4.0/ HE-2015 library and the ENDF-B/VIII.0 library, and those from theoretical calculations based on INCA code and Talys-1.9 code. Being the first white-neutron-source-based systematic measurement of the angle-differential cross sections of neutron-induced deuteron production reactions on carbon in several tens of MeV, the present work can provide a reference to the data library considering the lack of experimental data. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>The formation of large size clusters, and/or their relative motion as a possible excitation mode, are suggested to be closely related to the origin of deformation in specific cases, namely the case of two doubly-magic clusters or two clusters with nearby characterization. New lifetime data in <jats:italic>N</jats:italic> = <jats:italic>Z</jats:italic> <jats:sup>76</jats:sup>Sr and <jats:sup>80</jats:sup>Zr leading to large <jats:italic>B</jats:italic>(<jats:italic>E</jats:italic>2) values are reproduced consistently and well within this approach, along with data for a few neighboring <jats:italic>N</jats:italic> <jats:inline-formula> <jats:tex-math><?CDATA $\approx $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064002_Z-20210331142559.jpg" xlink:type="simple" /> </jats:inline-formula> <jats:italic>Z</jats:italic> nuclei. These results are compared to previous studies of <jats:sup>32</jats:sup>S and <jats:sup>20</jats:sup>Ne and all of them support the ideas of the large-scale cluster approach. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>We studied the effects of centrality fluctuation and deuteron formation on the cumulant ( <jats:inline-formula> <jats:tex-math><?CDATA $C_n$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064003_M2.jpg" xlink:type="simple" /> </jats:inline-formula>) and correlation functions ( <jats:inline-formula> <jats:tex-math><?CDATA $\kappa_n$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064003_M3.jpg" xlink:type="simple" /> </jats:inline-formula>) of protons up to the sixth order in the most central ( <jats:inline-formula> <jats:tex-math><?CDATA $b$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064003_M4.jpg" xlink:type="simple" /> </jats:inline-formula>&lt; 3 fm) Au+Au collisions at <jats:inline-formula> <jats:tex-math><?CDATA $ \sqrt {{s_{{{NN}}}}}\; $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064003_M5.jpg" xlink:type="simple" /> </jats:inline-formula>= 3 GeV in a microscopic transport model (JAM). The results are presented as a function of rapidity acceptance within the transverse momentum 0.4 &lt; p <jats:sub>T</jats:sub> &lt; 2 GeV/ <jats:italic>c</jats:italic>. We compared the results obtained by the centrality bin width correction (CBWC) using charged reference particle multiplicities with the CBWC using impact parameter bins. It was found that, at low energies, the centrality resolution for determining the collision centrality using charged particle multiplicities is not sufficient to reduce the initial volume fluctuation effect for higher-order cumulant analysis. New methods need to be developed to classify events with high centrality resolution for heavy-ion collisions at low energies. Finally, we observed that the formation of deuterons suppresses the higher-order cumulants and correlation functions of protons and found it to be similar to the efficiency effect. This work can serve as a noncritical baseline for the QCD critical point search in the high baryon density region. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>First-principle calculations within the density functional theory framework are used to study the probability of electron capture for the <jats:sup>7</jats:sup>Be nucleus. For this purpose, electron density at the <jats:sup>7</jats:sup>Be nucleus is computed in Al, Au, Pd, Pt, and Pb environments. Our results show that the half-life of <jats:sup>7</jats:sup>Be is changed by implanting <jats:sup>7</jats:sup>Be in host environments. Electron affinity of the media and confinement effects are responsible for the change in the half-life of <jats:sup>7</jats:sup>Be nucleus. Moreover, electric potential at the <jats:sup>7</jats:sup>Be nucleus is calculated. Results show that variations in electric potential are usually consistent with those in electron density at the <jats:sup>7</jats:sup>Be nucleus. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>The self-consistent mean field approximation of the two-flavor NJL model, with a free parameter <jats:inline-formula> <jats:tex-math><?CDATA $\alpha$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064102_M1.jpg" xlink:type="simple" /> </jats:inline-formula> to reflect the competition between the "direct" channel and the "exchange" channel, is employed to study the QCD phase structure at finite isospin chemical potential <jats:inline-formula> <jats:tex-math><?CDATA $\mu_I$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064102_M2.jpg" xlink:type="simple" /> </jats:inline-formula>, finite baryon chemical potential <jats:inline-formula> <jats:tex-math><?CDATA $\mu_B$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064102_M3.jpg" xlink:type="simple" /> </jats:inline-formula> and finite temperature <jats:italic>T</jats:italic>, and especially to study the location of the QCD critical point. Our results show that in order to match the corresponding lattice results of isospin density and energy density, the contributions of the "exchange" channel need to be considered in the framework of the NJL model, and a weighting factor <jats:inline-formula> <jats:tex-math><?CDATA $\alpha=0.5$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064102_M4.jpg" xlink:type="simple" /> </jats:inline-formula> should be taken. It is also found that for fixed isospin chemical potentials, the lower temperature of the phase transition is obtained with increasing <jats:inline-formula> <jats:tex-math><?CDATA $\alpha$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064102_M5.jpg" xlink:type="simple" /> </jats:inline-formula> in the <jats:inline-formula> <jats:tex-math><?CDATA $T-\mu_I$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064102_M6.jpg" xlink:type="simple" /> </jats:inline-formula> plane, and the largest difference of the phase transition temperature with different <jats:inline-formula> <jats:tex-math><?CDATA $\alpha$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064102_M7.jpg" xlink:type="simple" /> </jats:inline-formula>'s appears at <jats:inline-formula> <jats:tex-math><?CDATA $\mu_I \sim 1.5m_{\pi}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064102_M8.jpg" xlink:type="simple" /> </jats:inline-formula>. At <jats:inline-formula> <jats:tex-math><?CDATA $\mu_I=0$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064102_M9.jpg" xlink:type="simple" /> </jats:inline-formula> the temperature of the QCD critical end point (CEP) decreases with increasing <jats:inline-formula> <jats:tex-math><?CDATA $\alpha$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064102_M10.jpg" xlink:type="simple" /> </jats:inline-formula>, while the critical baryon chemical potential increases. At high isospin chemical potential ( <jats:inline-formula> <jats:tex-math><?CDATA $\mu_I=500$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064102_M11.jpg" xlink:type="simple" /> </jats:inline-formula> MeV), the temperature of the QCD tricritical point (TCP) increases with increasing <jats:inline-formula> <jats:tex-math><?CDATA $\alpha$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064102_M12.jpg" xlink:type="simple" /> </jats:inline-formula>, and in the low temperature regions the system will transition from the pion superfluidity phase to the normal phase as <jats:inline-formula> <jats:tex-math><?CDATA $\mu_B$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064102_M13.jpg" xlink:type="simple" /> </jats:inline-formula> increases. At low density, the critical temperature of the QCD phase transition with different <jats:inline-formula> <jats:tex-math><?CDATA $\alpha$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064102_M14.jpg" xlink:type="simple" /> </jats:inline-formula>'s rapidly increases with <jats:inline-formula> <jats:tex-math><?CDATA $\mu_I$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064102_M15.jpg" xlink:type="simple" /> </jats:inline-formula> at the beginning, and then increases smoothly around <jats:inline-formula> <jats:tex-math><?CDATA $\mu_I \gt 300$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064102_M16.jpg" xlink:type="simple" /> </jats:inline-formula> MeV. In the high baryon density region, the increase of the isospin chemical potential will raise the critical baryon chemical potential of the phase transition. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>The tensor-force effects on the evolution of spin-orbit splittings in neutron drops are investigated within the framework of the relativistic Hartree-Fock theory. For a fair comparison on the pure mean-field level, the results of the relativistic Brueckner-Hartree-Fock calculation with the Bonn A interaction are adopted as meta-data. Through a quantitative analysis, we certify that the <jats:inline-formula> <jats:tex-math><?CDATA $ \pi $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064103_M1.jpg" xlink:type="simple" /> </jats:inline-formula>-pseudovector ( <jats:inline-formula> <jats:tex-math><?CDATA $ \pi $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064103_M2.jpg" xlink:type="simple" /> </jats:inline-formula>-PV) coupling affects the evolutionary trend through the embedded tensor force. The strength of the tensor force is explored by enlarging the strength <jats:inline-formula> <jats:tex-math><?CDATA $ f_{\pi} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064103_M3.jpg" xlink:type="simple" /> </jats:inline-formula> of the <jats:inline-formula> <jats:tex-math><?CDATA $ \pi $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064103_M4.jpg" xlink:type="simple" /> </jats:inline-formula>-PV coupling. It is found that weakening the density dependence of <jats:inline-formula> <jats:tex-math><?CDATA $ f_{\pi} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064103_M5.jpg" xlink:type="simple" /> </jats:inline-formula> is slightly better than enlarging it with a factor. We thus provide a semiquantitative support for the <jats:italic>renormalization persistency</jats:italic> of the tensor force within the framework of density functional theory. This will serve as important guidance for further development of relativistic effective interactions with particular focus on the tensor force. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>From a Bayesian analysis of the electric dipole polarizability, the constrained energy of isovector giant dipole resonance, the peak energy of isocalar giant quadrupole resonance, and the constrained energy of isocalar giant monopole resonance in <jats:sup>208</jats:sup>Pb, we extract the isoscalar and isovector effective masses in nuclear matter at saturation density <jats:inline-formula> <jats:tex-math><?CDATA $ \rho_0 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064104_M1.jpg" xlink:type="simple" /> </jats:inline-formula> as <jats:inline-formula> <jats:tex-math><?CDATA $ m_{s,0}^{\ast}/m = 0.87_{-0.04}^{+0.04} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064104_M2.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ m_{v,0}^{\ast}/m = 0.78_{-0.05}^{+0.06} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064104_M3.jpg" xlink:type="simple" /> </jats:inline-formula>, respectively, at 90% confidence level. The constraints obtained on <jats:inline-formula> <jats:tex-math><?CDATA $ m_{s,0}^{\ast} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064104_M4.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ m_{v,0}^{\ast} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064104_M5.jpg" xlink:type="simple" /> </jats:inline-formula> lead to a positive isospin splitting of nucleon effective mass in asymmetric nuclear matter of isospin asymmetry <jats:inline-formula> <jats:tex-math><?CDATA $ \delta $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064104_M6.jpg" xlink:type="simple" /> </jats:inline-formula> at <jats:inline-formula> <jats:tex-math><?CDATA $ \rho_0 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064104_M7.jpg" xlink:type="simple" /> </jats:inline-formula> as <jats:inline-formula> <jats:tex-math><?CDATA $ m_{n-p}^* / m = (0.20^{+0.15}_{-0.14})\delta $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064104_M8.jpg" xlink:type="simple" /> </jats:inline-formula>. In addition, the symmetry energy at the subsaturation density <jats:inline-formula> <jats:tex-math><?CDATA $ \rho^{\ast} = 0.05\; \mathrm{fm}^{-3} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064104_M9.jpg" xlink:type="simple" /> </jats:inline-formula> is determined to be <jats:inline-formula> <jats:tex-math><?CDATA $ E_{\mathrm{sym}}(\rho^{\ast}) = 16.7\pm1.3 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064104_M10.jpg" xlink:type="simple" /> </jats:inline-formula> MeV at 90% confidence level. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Angular correlations between a heavy quark (HQ) and its tagged jet are potentially new tools to gain insight into the in-medium partonic interactions in relativistic heavy-ion collisions. In this work, we present the first theoretical study on the radial profiles of <jats:italic>B</jats:italic> mesons in jets in Pb+Pb collisions at the Large Hadron Collider (LHC). The initial production of a bottom quark tagged jet in <jats:italic>p+p</jats:italic> is computed by SHERPA, which matches the next-to-leading order matrix elements with contributions of parton showers, whereas the massive quark traversing the quark-gluon plasma is described by a Monte Carlo model, SHELL, which can simultaneously simulate light and heavy flavor in-medium energy loss within the framework of Langevin evolution. In <jats:italic>p+p</jats:italic> collisions, we find that at lower <jats:inline-formula> <jats:tex-math><?CDATA $p_T^Q$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064105_M1.jpg" xlink:type="simple" /> </jats:inline-formula> the radial profiles of heavy flavors in jets are sensitive to the heavy quark mass. In 0-10% Pb+Pb collisions at <jats:inline-formula> <jats:tex-math><?CDATA $\sqrt{s_{NN}} = 5.02$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064105_M3.jpg" xlink:type="simple" /> </jats:inline-formula> TeV, we observe an inverse modification pattern of the <jats:italic>B</jats:italic> meson radial profiles in jets at <jats:inline-formula> <jats:tex-math><?CDATA $ 4 \lt p_T^Q \lt 20 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064105_M4.jpg" xlink:type="simple" /> </jats:inline-formula> GeV compared to those of <jats:italic>D</jats:italic> mesons: the jet quenching effects narrow the jet radial profiles of <jats:italic>B</jats:italic> mesons in jets while broadening those of <jats:italic>D</jats:italic> mesons in jets. We find that in <jats:italic>A+A</jats:italic> collisions, the contribution dissipated from the higher <jats:inline-formula> <jats:tex-math><?CDATA $p_T^Q \gt 20$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_6_064105_M5.jpg" xlink:type="simple" /> </jats:inline-formula> GeV region naturally has a narrower initial distribution and consequently leads to a narrower modification pattern of the radial profile; however the diffusion nature of the heavy flavor in-medium interactions will give rise to a broader modification pattern of the radial profile. These two effects consequently compete and offset with each other, and the <jats:italic>b</jats:italic> quarks in jets benefit more from the former and suffer less diffusion effect compared to that of <jats:italic>c</jats:italic> quarks in jets. These findings can be tested in the future experimental measurements at the LHC to gain better understanding of the mass effect of jet quenching. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>In this paper, we explore the properties of holographic entanglement entropy (HEE), mutual information (MI) and entanglement of purification (EoP) in holographic Lifshitz theory. These informational quantities exhibit some universal properties of holographic dual field theory. For most configuration parameters and temperatures, these informational quantities change monotonically with the Lifshitz dynamical critical exponent <jats:italic>z</jats:italic>. However, we also observe some non-monotonic behaviors for these informational quantities in some specific spaces of configuration parameters and temperatures. A particularly interesting phenomenon is that a dome-shaped diagram emerges in the behavior of MI vs <jats:italic>z</jats:italic>, and correspondingly a trapezoid-shaped profile appears in that of EoP vs <jats:italic>z</jats:italic>. This means that for some specific configuration parameters and temperatures, the system measured in terms of MI and EoP is entangled only in a certain intermediate range of <jats:italic>z</jats:italic>. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Cosmic-ray (CR) anti-nuclei are often considered important observables for indirect dark matter (DM) detection at low kinetic energies, below GeV per nucleon. Since the primary CR fluxes drop quickly towards high energies, the secondary anti-nuclei in CR are expected to be significantly suppressed in high energy regions (<jats:inline-formula> <jats:tex-math id="M1">\begin{document}$\gtrsim 100$\end{document}</jats:tex-math> </jats:inline-formula> GeV per nucleon). If DM particles are heavy, the annihilation productions of DM can be highly boosted, and thus the fluxes of anti-nuclei produced by DM annihilation may exceed the secondary background at high energies, which opens a high energy window for indirect DM detection. We investigate the possibility of detecting heavy DM particles which annihilate into high energy anti-nuclei. We use the Monte Carlo generators PYTHIA, EPOS-LHC and DPMJET and the coalescence model to simulate the production of anti-nuclei, and constrain the DM annihilation cross-sections by using the AMS-02 and HAWC antiproton data and the HESS galactic center <jats:inline-formula> <jats:tex-math id="M27">\begin{document}$ \gamma $\end{document}</jats:tex-math> </jats:inline-formula>-ray data. We find that the conclusion depends on the choice of DM density profiles. For the “Cored” type profile with a DM particle mass <jats:inline-formula> <jats:tex-math id="M2">\begin{document}$\gtrsim 10$\end{document}</jats:tex-math> </jats:inline-formula> TeV, the contributions from DM annihilation can exceed the secondary background in high energy regions, which opens the high energy window, while for the “Cuspy” type profile, the excess disappears.</jats:p>