Catálogo de publicaciones - revistas

<jats:title>Abstract</jats:title> <jats:p>The <jats:inline-formula> <jats:tex-math><?CDATA $ \Lambda $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124001_M425.jpg" xlink:type="simple" /> </jats:inline-formula> separation energy for <jats:inline-formula> <jats:tex-math><?CDATA $ \Lambda $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124001_M426.jpg" xlink:type="simple" /> </jats:inline-formula> hypernuclei, denoted <jats:inline-formula> <jats:tex-math><?CDATA $ B_\Lambda $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124001_M427.jpg" xlink:type="simple" /> </jats:inline-formula>, measured in 1967, 1968, and 1973 are recalibrated using the current best estimates of the mass of particles and nuclei. The recalibrated <jats:inline-formula> <jats:tex-math><?CDATA $ B_\Lambda $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124001_M428.jpg" xlink:type="simple" /> </jats:inline-formula> are systematically larger (except in the case of <jats:inline-formula> <jats:tex-math><?CDATA $ ^6_\Lambda $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124001_M429.jpg" xlink:type="simple" /> </jats:inline-formula>He) than the originally published values by about 100 keV. The effect of this level of recalibration is very important for light hypernuclei, especially for the hypertriton. The early <jats:inline-formula> <jats:tex-math><?CDATA $ B_\Lambda $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124001_M430.jpg" xlink:type="simple" /> </jats:inline-formula> values measured in 1967, 1968, and 1973 are widely used in theoretical research, and the new results provide better constraints for the conclusions of such studies. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Differential and angle-integrated cross sections for the <jats:sup>10</jats:sup>B(<jats:italic>n</jats:italic>, <jats:italic>α</jats:italic>)<jats:sup>7</jats:sup>Li, <jats:sup>10</jats:sup>B(<jats:italic>n</jats:italic>, <jats:italic>α</jats:italic> <jats:sub>0</jats:sub>) <jats:sup>7</jats:sup>Li and <jats:sup>10</jats:sup>B(<jats:italic>n</jats:italic>, <jats:italic>α</jats:italic> <jats:sub>1</jats:sub>) <jats:sup>7</jats:sup>Li<jats:sup>*</jats:sup> reactions have been measured at CSNS Back-<jats:italic>n</jats:italic> white neutron source. Two enriched (90%) <jats:sup>10</jats:sup>B samples 5.0 cm in diameter and ~85.0 μg/cm<jats:sup>2</jats:sup> in thickness each with an aluminum backing were prepared, and back-to-back mounted at the sample holder. The charged particles were detected using the silicon-detector array of the Light-charged Particle Detector Array (LPDA) system. The neutron energy <jats:italic>E<jats:sub>n</jats:sub> </jats:italic> was determined by TOF (time-of-flight) method, and the valid <jats:italic>α</jats:italic> events were extracted from the <jats:italic>E<jats:sub>n</jats:sub> </jats:italic>-Amplitude two-dimensional spectrum. With 15 silicon detectors, the differential cross sections of <jats:italic>α</jats:italic>-particles were measured from 19.2° to 160.8°. Fitted with the Legendre polynomial series, the (<jats:italic>n</jats:italic>, <jats:italic>α</jats:italic>) cross sections were obtained through integration. The absolute cross sections were normalized using the standard cross sections of the <jats:sup>10</jats:sup>B(<jats:italic>n</jats:italic>, <jats:italic>α</jats:italic>)<jats:sup>7</jats:sup>Li reaction in the 0.3 – 0.5 MeV neutron energy region. The measurement neutron energy range for the <jats:sup>10</jats:sup>B(<jats:italic>n</jats:italic>, <jats:italic>α</jats:italic>)<jats:sup>7</jats:sup>Li reaction is 1.0 eV≤<jats:italic>E<jats:sub>n</jats:sub> </jats:italic> &lt; 2.5 MeV (67 energy points), and that for the <jats:sup>10</jats:sup>B(<jats:italic>n</jats:italic>, <jats:italic>α</jats:italic> <jats:sub>0</jats:sub>) <jats:sup>7</jats:sup>Li and <jats:sup>10</jats:sup>B(<jats:italic>n</jats:italic>, <jats:italic>α</jats:italic> <jats:sub>1</jats:sub>) <jats:sup>7</jats:sup>Li<jats:sup>*</jats:sup> reactions is 1.0 eV ≤ <jats:italic>E<jats:sub>n</jats:sub> </jats:italic> &lt; 1.0 MeV (59 energy points). The present results have been analyzed by the resonance reaction mechanism and the level structure of the <jats:sup>11</jats:sup>B compound system, and compared with existing measurements and evaluations. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>This work uses the Boltzmann transport model to study the thermal production of <jats:inline-formula> <jats:tex-math><?CDATA $J/\psi$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124101_M2.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $\psi(2S)$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124101_M3.jpg" xlink:type="simple" /> </jats:inline-formula> in the quark gluon plasma (QGP) produced by <jats:inline-formula> <jats:tex-math><?CDATA $\sqrt{s_{\rm NN}}=5.02$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124101_M4.jpg" xlink:type="simple" /> </jats:inline-formula> TeV Pb-Pb collisions. The <jats:inline-formula> <jats:tex-math><?CDATA $J/\psi$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124101_M5.jpg" xlink:type="simple" /> </jats:inline-formula> nuclear modification factors are studied in detail alongside the mechanisms of primordial production and the recombination of charm and anti-charm quarks in the thermal medium. The <jats:inline-formula> <jats:tex-math><?CDATA $\psi(2S)$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124101_M6.jpg" xlink:type="simple" /> </jats:inline-formula> binding energy is much smaller in the hot medium compared to the ground state; thus, <jats:inline-formula> <jats:tex-math><?CDATA $\psi(2S)$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124101_M7.jpg" xlink:type="simple" /> </jats:inline-formula> with middle to low <jats:inline-formula> <jats:tex-math><?CDATA $p_{\rm T}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124101_M8.jpg" xlink:type="simple" /> </jats:inline-formula> can be thermally regenerated in the later stages of QGP expansions, enabling <jats:inline-formula> <jats:tex-math><?CDATA $\psi(2S)$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124101_M9.jpg" xlink:type="simple" /> </jats:inline-formula> to inherit larger collective flows from the bulk medium. We quantitatively study the nuclear modification factors of both <jats:inline-formula> <jats:tex-math><?CDATA $J/\psi$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124101_M10.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $\psi(2S)$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124101_M11.jpg" xlink:type="simple" /> </jats:inline-formula> in different centralities and transverse momentum bins for <jats:inline-formula> <jats:tex-math><?CDATA $\sqrt{s_{\rm NN}}=5.02$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124101_M12.jpg" xlink:type="simple" /> </jats:inline-formula> TeV Pb-Pb collisions. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>In order to describe charge exchange reactions at intermediate energies, we implemented as a first step the formulation of the normal eikonal approach. The calculated differential cross-sections based on this approach deviated significantly from the conventional DWBA calculations for CE reactions at 140 MeV/nucleon. Thereafter, improvements were made in the application of the eikonal approximation so as to keep a strict three-dimensional form factor. The results obtained with the improved eikonal approach are in good agreement with the DWBA calculations and with the experimental data. Since the improved eikonal approach can be formulated in a microscopic way, it is easy to apply to CE reactions at higher energies, where the phenomenological DWBA is a priori difficult to use due to the lack, in most cases, of the required phenomenological potentials.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>The multinucleon transfer (MNT) process has been proposed as a promising approach to produce neutron-rich superheavy nuclei (SHN). MNT reactions based on the radioactive targets <jats:sup>249</jats:sup>Cf, <jats:sup>254</jats:sup>Es, and <jats:sup>257</jats:sup>Fm are investigated within the framework of the improved version of a dinuclear system (DNS-sysu) model. The MNT reaction <jats:sup>238</jats:sup>U + <jats:sup>238</jats:sup>U was studied extensively as a promising candidate for producing SHN. However, based on the calculated cross-sections, it was found that there is little possibility to produce SHN in the reaction <jats:sup>238</jats:sup>U + <jats:sup>238</jats:sup>U. In turn, the production of SHN in reactions with radioactive targets is likely. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>We propose a method for extracting the properties of the isobaric mass parabola based on the total double <jats:inline-formula> <jats:tex-math><?CDATA $ \beta $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124104_M1.jpg" xlink:type="simple" /> </jats:inline-formula>-decay energies of isobaric nuclei. Two important parameters of the mass parabola, the location of the most <jats:inline-formula> <jats:tex-math><?CDATA $ \beta $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124104_M2.jpg" xlink:type="simple" /> </jats:inline-formula>-stable nuclei <jats:inline-formula> <jats:tex-math><?CDATA $ Z_{A} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124104_M3.jpg" xlink:type="simple" /> </jats:inline-formula> and the curvature parameter <jats:inline-formula> <jats:tex-math><?CDATA $ b_{A} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124104_M4.jpg" xlink:type="simple" /> </jats:inline-formula>, are obtained for 251 <jats:italic>A</jats:italic> values, based on the total double <jats:inline-formula> <jats:tex-math><?CDATA $ \beta $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124104_M5.jpg" xlink:type="simple" /> </jats:inline-formula>-decay energies of nuclei compiled in the AME2016 database. The advantage of this approach is that the pairing energy term <jats:inline-formula> <jats:tex-math><?CDATA $ P_{A} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124104_M6.jpg" xlink:type="simple" /> </jats:inline-formula> caused by the odd-even variation can be removed in the process, as well as the mass excess <jats:inline-formula> <jats:tex-math><?CDATA $ M(A,Z_{A}) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124104_M7.jpg" xlink:type="simple" /> </jats:inline-formula> of the most stable nuclide for the mass number <jats:italic>A</jats:italic>, which are employed in the mass parabolic fitting method. The Coulomb energy coefficient <jats:inline-formula> <jats:tex-math><?CDATA $ a_{c} = 0.6910 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124104_M9.jpg" xlink:type="simple" /> </jats:inline-formula> MeV is determined by the mass difference relation for mirror nuclei, and the symmetry energy coefficient is also studied by the relation <jats:inline-formula> <jats:tex-math><?CDATA $ a_{\rm sym}(A) = 0.25b_{A}Z_{A} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124104_M10.jpg" xlink:type="simple" /> </jats:inline-formula>. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>In this study, we compared the effect of the isospin asymmetry of proton and neutron density distributions in the neutron skin-type (NST) case and in the Hartree-Fock formalism (HF) on the half-life of alpha emitters with the atomic number in the range of <jats:inline-formula> <jats:tex-math><?CDATA $82\leqslant Z\leqslant 92$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124105_M1.jpg" xlink:type="simple" /> </jats:inline-formula>. The NST case and HF formalism based on the Skyrme-SLy4 effective interaction reveal different isospin asymmetries for selected alpha emitters. Furthermore, the obtained results reveal an increase in the <jats:italic>α</jats:italic>-decay widths of about 30% for the NST case in comparison with the equivalent values obtained by HF formalism. The standard deviations for calculated half-lives within the NST case and HF formalism are about 0.438 and 0.391, respectively. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>We study the structure of neutron-rich calcium isotopes in the shell model with realistic interactions. The CD-Bonn and Kuo-Brown (KB) interactions are used. As these interactions do not include the three-body force, their direct use leads to poor results. We tested whether the adjustment of the single particle energies (SPEs) would be sufficient to include the three-body correlations empirically. It turns out that the CD-Bonn interaction, after the adjustment of SPEs, gives good agreement with the experimental data for the energies and spectroscopy. For the KB interaction, both the SPEs and monopole terms require adjustments. Thus, the monopole problem is less serious for modern realistic interactions which include perturbations up to the third order. We also tested the effect of the non-central force on the shell structure. It is found that the effect of the tensor force in the CD-Bonn interaction is weaker than in the KB interaction.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>All existing experimental evidence for the bound state nature of <jats:inline-formula> <jats:tex-math><?CDATA $X(3872)$ ?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124107_M1.jpg" xlink:type="simple" /> </jats:inline-formula> relies on observing its decay products, which are measured with a finite experimental mass resolution that is typically <jats:inline-formula> <jats:tex-math><?CDATA $\Delta m \geqslant 2 $ ?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124107_M2.jpg" xlink:type="simple" /> </jats:inline-formula> MeV , and much larger than its alleged binding energy, <jats:inline-formula> <jats:tex-math><?CDATA $B_X=0.00\,(18)$ ?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124107_M3.jpg" xlink:type="simple" /> </jats:inline-formula> MeV. On the other hand, we have found recently that there is a clear cancellation in the <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_43_12_124107_M4.jpg" xlink:type="simple" /> </jats:inline-formula> channel of the invariant <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_43_12_124107_M5.jpg" xlink:type="simple" /> </jats:inline-formula> mass around the threshold between continuum and the bound state. This is very much like a similar cancellation in the proton-neutron continuum with the deuteron in the <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_43_12_124107_M6.jpg" xlink:type="simple" /> </jats:inline-formula> channel. Based on comparative fits with a common Tsallis distribution of the experimental cross-sections for prompt production of deuterons and <jats:inline-formula> <jats:tex-math><?CDATA $X(3872)$ ?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124107_M7.jpg" xlink:type="simple" /> </jats:inline-formula> in pp collisions with a finite <jats:inline-formula> <jats:tex-math><?CDATA $p_T$ ?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_12_124107_M8.jpg" xlink:type="simple" /> </jats:inline-formula>, we find a strong argument for questioning the bound state nature of this state, which also suggests that the large observed production rate could be consistent with a half-bound state. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>A microscopic high spin study of neutron deficient and normally deformed <jats:sup>133,135,137</jats:sup>Sm has been carried out in projected shell model framework. The theoretical results have been obtained for the spins, parities and energy values of yrast and excited bands. Besides this, the band spectra, band head energies, moment of inertia and electromagnetic transition strengths are also predicted in these isotopes. The calculations successfully give a deeper understanding of the mechanism of the formation of yrast and excited bands from the single and multi-quasi particle configurations. The results on moment of inertia predict an alignment of a pair of protons in the proton (1<jats:italic>h</jats:italic> <jats:sub>11/2</jats:sub>)<jats:sup>2</jats:sup> orbitals in the yrast ground state bands of <jats:sup>133-137</jats:sup>Sm due to the crossing of one quasiparticle bands by multi-quasiparticle bands at higher spins. The discussion in the present work is based on the deformed single particle scheme. Any future experimental confirmation or refutation of our predictions will be a valuable information which can help to understand the deformed single particle structure in these odd mass neutron deficient <jats:sup>133-137</jats:sup>Sm. </jats:p>