Catálogo de publicaciones - revistas

<jats:title>Abstract</jats:title> <jats:p>In order to confirm the existence of the dibaryon state <jats:inline-formula> <jats:tex-math><?CDATA $ d^*(2380) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023105_M1.jpg" xlink:type="simple" /> </jats:inline-formula> observed at WASA@COSY, we estimate the cross section for production of the possible dibaryon and anti-dibaryon pair <jats:inline-formula> <jats:tex-math><?CDATA $ {d^*}{\bar{d}^*} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023105_M2.jpg" xlink:type="simple" /> </jats:inline-formula> in the energy region of the upcoming experiments at <jats:inline-formula> <jats:tex-math><?CDATA $ {\bar{{\rm{P}}}} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023105_M3.jpg" xlink:type="simple" /> </jats:inline-formula>anda. Based on some qualitative properties of <jats:inline-formula> <jats:tex-math><?CDATA $ {d^*} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023105_M4.jpg" xlink:type="simple" /> </jats:inline-formula> extracted from the analyses in the non-relativistic quark model, the production cross section for this spin-3 particle pair are calculated with the help of a phenomenological effective relativistic and covariant Lagrangian approach. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>In our previous work [Phys. Rev. C <jats:bold>101</jats:bold>, 014003 (2020)], the photoproduction reaction <jats:inline-formula> <jats:tex-math><?CDATA $\gamma p \to K^{\ast +} \Lambda$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023106_M1.jpg" xlink:type="simple" /> </jats:inline-formula> was investigated within an effective Lagrangian approach. The reaction amplitudes were constructed by including the <jats:italic>t</jats:italic>-channel <jats:italic>K</jats:italic>, <jats:inline-formula> <jats:tex-math><?CDATA $K^\ast$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023106_M2.jpg" xlink:type="simple" /> </jats:inline-formula>, and <jats:italic>κ</jats:italic> exchanges, <jats:italic>u</jats:italic>-channel Λ, Σ, and <jats:inline-formula> <jats:tex-math><?CDATA $\Sigma^\ast$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023106_M3.jpg" xlink:type="simple" /> </jats:inline-formula> exchanges, <jats:italic>s</jats:italic>-channel <jats:italic>N</jats:italic>, <jats:inline-formula> <jats:tex-math><?CDATA $N(2000)5/2^+$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023106_M4.jpg" xlink:type="simple" /> </jats:inline-formula>, and <jats:inline-formula> <jats:tex-math><?CDATA $N(2060)5/2^-$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023106_M5.jpg" xlink:type="simple" /> </jats:inline-formula> exchanges, and interaction current. The data on the differential cross sections and spin density matrix elements were described simultaneously. In this study, we investigate the photoproduction reaction <jats:inline-formula> <jats:tex-math><?CDATA $\gamma n \to K^{\ast 0} \Lambda$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023106_M6.jpg" xlink:type="simple" /> </jats:inline-formula> based on the same reaction mechanism as that of <jats:inline-formula> <jats:tex-math><?CDATA $\gamma p \to K^{\ast +} \Lambda$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023106_M7.jpg" xlink:type="simple" /> </jats:inline-formula> to obtain a unified description of the data for <jats:inline-formula> <jats:tex-math><?CDATA $\gamma p \to K^{\ast +} \Lambda$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023106_M8.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $\gamma n \to K^{\ast 0} \Lambda$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023106_M9.jpg" xlink:type="simple" /> </jats:inline-formula> within the same model. All hadronic coupling constants, form factor cutoffs, and the resonance masses and widths in the present calculations remain the same as in our previous work for <jats:inline-formula> <jats:tex-math><?CDATA $\gamma p \to K^{\ast +} \Lambda$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023106_M10.jpg" xlink:type="simple" /> </jats:inline-formula>. The available differential cross-section data for <jats:inline-formula> <jats:tex-math><?CDATA $\gamma n \to K^{\ast 0} \Lambda$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023106_M11.jpg" xlink:type="simple" /> </jats:inline-formula> are well reproduced. Further analysis shows that the cross sections of <jats:inline-formula> <jats:tex-math><?CDATA $\gamma n \to K^{\ast 0} \Lambda$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023106_M12.jpg" xlink:type="simple" /> </jats:inline-formula> are dominated by the contributions of the <jats:italic>t</jats:italic>-channel <jats:italic>K</jats:italic> exchange, while the <jats:italic>s</jats:italic>-channel <jats:inline-formula> <jats:tex-math><?CDATA $N(2000)5/2^+$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023106_M13.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $N(2060)5/2^-$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023106_M14.jpg" xlink:type="simple" /> </jats:inline-formula> exchanges also provide considerable contributions. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>In this study, the heavy to heavy decay of <jats:inline-formula> <jats:tex-math><?CDATA $ B^0_s\rightarrow D^{*+}D^- $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023107_M1.jpg" xlink:type="simple" /> </jats:inline-formula> is evaluated through the factorization approach by using the final state interaction as an effective correction. Under the factorization approach, this decay mode occurs only through the annihilation process, so a small amount is produced. Feynman's rules state that six meson pairs can be assumed for the intermediate states before the final meson pairs are produced. By taking into account the effects of twelve final state interaction diagrams in the calculations, a significant correction is obtained. These effects correct the value of the branching ratio obtained by the pure factorization approach from <jats:inline-formula> <jats:tex-math><?CDATA $ (2.41\pm1.37)\times10^{-5} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023107_M2.jpg" xlink:type="simple" /> </jats:inline-formula> to <jats:inline-formula> <jats:tex-math><?CDATA $ (8.27\pm2.23)\times10^{-5} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023107_M3.jpg" xlink:type="simple" /> </jats:inline-formula>. The value obtained for the branching ratio of the <jats:inline-formula> <jats:tex-math><?CDATA $ B^0_s\rightarrow D^{*+}D^- $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_023107_M4.jpg" xlink:type="simple" /> </jats:inline-formula> decay is consistent with the experimental results. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Cross sections of the <jats:sup>58,60,61</jats:sup>Ni(<jats:italic>n</jats:italic>, <jats:italic>α</jats:italic>)<jats:sup>55,57,58</jats:sup>Fe reactions were measured at 8.50, 9.50 and 10.50 MeV neutron energies based on the HI-13 tandem accelerator of China Institute of Atomic Energy (CIAE) with enriched <jats:sup>58</jats:sup>Ni, <jats:sup>60</jats:sup>Ni, and <jats:sup>61</jats:sup>Ni foil samples with backings. A twin gridded ionization chamber (GIC) was used as the charged particle detector, and an EJ-309 liquid scintillator was used to obtain the neutron energy spectra. The relative and absolute neutron fluxes were determined via three highly enriched <jats:sup>238</jats:sup>U<jats:sub>3</jats:sub>O<jats:sub>8</jats:sub> samples inside the GIC. The uncertainty of the present data of the <jats:sup>58</jats:sup>Ni(<jats:italic>n</jats:italic>, <jats:italic>α</jats:italic>)<jats:sup>55</jats:sup>Fe reaction is smaller than most existing measurements. The present data of <jats:sup>60</jats:sup>Ni(<jats:italic>n</jats:italic>, <jats:italic>α</jats:italic>)<jats:sup>57</jats:sup>Fe and <jats:sup>61</jats:sup>Ni(<jats:italic>n</jats:italic>, <jats:italic>α</jats:italic>)<jats:sup>58</jats:sup>Fe reactions are the first measurement results above 8 MeV. The present experimental data could be reasonably reproduced by calculations with TALYS-1.9 by adjusting several default values of theoretical model parameters. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Neutron-deficient actinide nuclei provide a valuable window to probe heavy nuclear systems with large proton-neutron ratios. In recent years, several new neutron-deficient Uranium and Neptunium isotopes have been observed using <jats:italic>α</jats:italic>-decay spectroscopy [Z. Y. Zhang <jats:italic>et al.</jats:italic>, Phys. Rev. Lett. <jats:bold>122</jats:bold>, 192503 (2019); L. Ma <jats:italic>et al.</jats:italic>, Phys. Rev. Lett. <jats:bold>125</jats:bold>, 032502 (2020); Z. Y. Zhang <jats:italic>et al.</jats:italic>, Phys. Rev. Lett. <jats:bold>126</jats:bold>, 152502 (2021)]. In spite of these achievements, some neutron-deficient key nuclei in this mass region are still unknown in experiments. Machine learning algorithms have been applied successfully in different branches of modern physics. It is interesting to explore their applicability in <jats:italic>α</jats:italic>-decay studies. In this work, we propose a new model to predict the <jats:italic>α</jats:italic>-decay energies and half-lives within the framework based on a machine learning algorithm called the Gaussian process. We first calculate the <jats:italic>α</jats:italic>-decay properties of the new actinide nucleus <jats:inline-formula> <jats:tex-math><?CDATA $ {}^{214}{\rm{U}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_024101_M1.jpg" xlink:type="simple" /> </jats:inline-formula>. The theoretical results show good agreement with the latest experimental data, which demonstrates the reliability of our model. We further use the model to predict the <jats:italic>α</jats:italic>-decay properties of some unknown neutron-deficient actinide isotopes and compare the results with traditional models. The results may be useful for future synthesis and identification of these unknown isotopes. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>In this study, we investigate the effect of rotation on the masses of scalar and vector mesons in the framework of the 2-flavor Nambu-Jona-Lasinio model. The existence of rotation produces a tedious quark propagator and a corresponding polarization function. By applying the random phase approximation, the meson mass is numerically calculated. It is found that the behavior of scalar and pseudoscalar meson masses under angular velocity <jats:italic>ω</jats:italic> is similar to that at a finite chemical potential; both rely on the behavior of the constituent quark mass and reflect the property related to chiral symmetry. However, vector meson <jats:italic>ρ</jats:italic> masses have a more profound relation to rotation. After analytical and numerical calculations, it turns out that at low temperature and small chemical potential, the mass for spin component <jats:inline-formula> <jats:tex-math><?CDATA $ s_z = 0,\pm 1 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_024102_M1.jpg" xlink:type="simple" /> </jats:inline-formula> of a vector meson under rotation exhibits a very simple mass splitting relation <jats:inline-formula> <jats:tex-math><?CDATA $ m_{\rho}^{s_z}(\omega) = m_\rho(\omega = 0)-\omega s_z $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_024102_M2.jpg" xlink:type="simple" /> </jats:inline-formula>, similar to the Zeeman splitting of a charged meson under magnetic fields. Furthermore, the mass of the spin component <jats:inline-formula> <jats:tex-math><?CDATA $ s_z = 1 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_024102_M3.jpg" xlink:type="simple" /> </jats:inline-formula> of vector meson <jats:italic>ρ</jats:italic> decreases linearly with <jats:italic>ω</jats:italic> and reaches zero at <jats:inline-formula> <jats:tex-math><?CDATA $ \omega_c = m_\rho(\omega = 0) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_024102_M4.jpg" xlink:type="simple" /> </jats:inline-formula>, which indicates that the system will develop <jats:inline-formula> <jats:tex-math><?CDATA $ s_z = 1 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_024102_M5.jpg" xlink:type="simple" /> </jats:inline-formula> vector meson condensation and the system will be spontaneously spin-polarized under rotation. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>We have calculated the potential energy surfaces for <jats:sup>240</jats:sup>Pu up to the scission point using the density functional theory with different pairing strengths to investigate the effect of pairing correlations on its fission properties. An enhancement in the pairing correlations lowers the barrier heights, isomeric state, and ridge between the symmetric and asymmetric fission valleys significantly. Moreover, it weakens the microscopic shell structure around the Fermi surface, shrinks the scission frontiers, especially for the symmetric and very asymmetric fission regions, and lifts the total kinetic energies (TKEs) for the symmetric fission region. It is also emphasized that the microscopic calculation qualitatively reproduces the trend of the distribution of the measured TKEs, especially for the positions of the peaks at <jats:inline-formula> <jats:tex-math><?CDATA $A_{\rm{frag}}\simeq132$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_024103_M1.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $A_{\rm{frag}}\simeq108$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_024103_M2.jpg" xlink:type="simple" /> </jats:inline-formula>. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>High-order cumulants and factorial cumulants of conserved charges are suggested for the study of the critical dynamics in heavy-ion collision experiments. In this paper, using the parametric representation of the three-dimensional Ising model which is believed to belong to the same universality class as quantum chromo-dynamics, the temperature dependence of the second- to fourth-order (factorial) cumulants of the order parameter is studied. It is found that the values of the normalized cumulants are independent of the external magnetic field at the critical temperature, which results in a fixed point in the temperature dependence of the normalized cumulants. In finite-size systems simulated using the Monte Carlo method, this fixed point behavior still exists at temperatures near the critical. This fixed point behavior has also appeared in the temperature dependence of normalized factorial cumulants from at least the fourth order. With a mapping from the Ising model to QCD, the fixed point behavior is also found in the energy dependence of the normalized cumulants (or fourth-order factorial cumulants) along different freeze-out curves.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>In this study, the Pauli blocking potential between two colliding nuclei in the density overlapping region is applied to describe the heavy nuclei fusion process. Inspired by the Pauli blocking effect in the <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_46_2_024105_M1.jpg" xlink:type="simple" /> </jats:inline-formula>-decay of heavy nuclei, the Pauli blocking potential of single nucleon from the surrounding matter is obtained. In fusion reactions with strong density overlap, the Pauli blocking potential between the projectile and target can be constructed using a single folding model. By considering this potential, the double folding model with a new parameter set is employed to analyze the fusion processes of 95 systems. A wider Coulomb barrier and shallower potential pocket are formed in the inner part of the potential between the two colliding nuclei, compared to that calculated using the Akyüz-Winther potential. The fusion hindrance phenomena at deep sub-barrier energies are described well for fusion systems <jats:inline-formula> <jats:tex-math><?CDATA $ ^{16} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_024105_M2.jpg" xlink:type="simple" /> </jats:inline-formula>O + <jats:inline-formula> <jats:tex-math><?CDATA $ ^{208} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_024105_M3.jpg" xlink:type="simple" /> </jats:inline-formula>Pb and <jats:inline-formula> <jats:tex-math><?CDATA $ ^{58} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_024105_M4.jpg" xlink:type="simple" /> </jats:inline-formula>Ni + <jats:inline-formula> <jats:tex-math><?CDATA $ ^{58} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_2_024105_M5.jpg" xlink:type="simple" /> </jats:inline-formula>Ni. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>We report a benchmark calculation for the Lipkin model in nuclear physics with a variational quantum eigensolver in quantum computing. Special attention is paid to the unitary coupled cluster (UCC) ansatz and structure learning (SL) ansatz for the trial wave function. Calculations with both the UCC and SL ansatz can reproduce the ground-state energy well; however, it is found that the calculation with the SL ansatz performs better than that with the UCC ansatz, and the SL ansatz has even fewer quantum gates than the UCC ansatz.</jats:p>