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Nuclear Theory·nucl-th

Monday·February 3, 2025

11 papers—3 primary·8 cross-listed

All11Primary3Cross-lists8
  1. 01

    Patterns of spin and pseudo-spin symmetries in nuclear relativistic mean-field approaches

    L. Heitz🇫🇷 · J.P. Ebran🇫🇷 · E. Khan🇫🇷

    The behavior of spin doublets is known to play a major role in nuclear structure and shell effects. Pseudo-spin doublets are also known to impact the single-particle spectrum. The covariant framework, having these two effects encoded in its approach, is an excellent tool to understand the main mechanism driving theses spin and pseudo-spin symmetries and their breaking. A perturbative expansion of the degeneracy raising related to spin and pseudo-spin effects is proposed, up to second order. It allows to understand the main behavior of spin and pseudo-spin energy doublets, such as their A dependence, as well as their common footing and differences. In the case of the spin symmetry, only the lower component of the Dirac bi-spinor is involved, whereas in the case of the pseudo-spin one, both the upper and lower components are involved. Their interplay with the covariant potentials is also analyzed.

    nucl-thPRC(2025)·1 citation
  2. 02

    Exploring total fission cross sections of neutron- and proton-induced reactions of exotic nuclei at relativistic energies using the INCL-ABLA++ models

    J.L.Rodríguez-Sánchez🇪🇸 · A.Graña-González🇪🇸 · J.-C.David🇫🇷 · G.García-Jiménez🇺🇸 · J.Hirtz🇫🇷 · A.Kelić-Heil🇩🇪

    Spallation-induced fission reactions, in combination with state-of-the-art dynamical calculations, provide a robust framework for studying the nuclear dissipation mechanism in nuclear matter over a wide range of deformations. Experimental datasets of neutron- and proton-induced fission, accumulated over the last decades, cover a wide range of nuclei from the pre-actinide to the actinide region. In this work, these datasets are used to benchmark the dynamical Liège intranuclear cascade model INCL++ integrated with the ABLA++ de-excitation code, which has been improved by updating the calculation of particle separation energies to the atomic mass evaluation (AME2020) and incorporating phenomenological corrections to enhance the description of fission-barrier heights. The results show good agreement with the available experimental data of total fission cross sections induced by protons and neutrons, thereby confirming the applicability and predictive capability of these models. Moreover, the improved framework is used to investigate the fission cross sections of exotic heavy fissile nuclei, far from the valley of stability, with masses .

    nucl-thPRC(2025)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE