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Nuclear Theory·nucl-th

Friday·December 23, 2022

11 papers—3 primary·8 cross-listed

All11Primary3Cross-lists8
  1. 01

    Microscopic Calculation of Fission Product Yields for Odd-Mass Nuclei

    N. Schunck · M. Verriere · G. Potel Aguilar · R. C. Malone · J. A. Silano · A. P. D. Ramirez · A. P. Tonchev

    Fission data are essential inputs to reaction networks involved in nucleosynthesis simulations and nuclear forensics. In such applications as well as in the description of multi-chance fission, the characteristics of fission for odd-mass nuclei are just as important as those for even-even nuclei. The fission theories that aim at explicitly describing fission dynamics are typically based on some variant of the nuclear mean-field theory. In such cases, the treatment of systems with an odd number of particles is markedly more involved, both formally and computationally. In this article, we use the blocking prescription of the Hartree-Fock-Bogoliubov theory with Skyrme energy functionals to compute the deformation properties of odd-mass uranium isotopes. We show that the resulting fission fragment distributions depend quite significantly on the spin of the odd neutron. By direct calculation of the spin distribution of the fissioning nucleus, we propose a methodology to rigorously predict the charge and mass distributions in odd-mass nuclei.

    nucl-thPRC(2023)·12 citations
  2. 02

    Smallest drop of QGP: Thermodynamic properties in p-Pb collisions

    Fernando G. Gardim🇧🇷 · Renata Krupczak🇧🇷 · Tiago Nunes da Silva🇧🇷

    The extreme conditions of temperature and density produced in ultrarelativistic collisions of heavy nuclei facilitate the formation of the most fundamental fluid in the universe, the deconfined phase of Quantum Chromodynamics called quark-gluon plasma. Despite the extensive experimental evidence collected over the past decade of its production in colliding systems such as Au-Au and Pb-Pb, establishing quark-gluon plasma formation in the collision of smaller systems, such as p-Pb, remains an open question. In this study, we describe the evolution of matter formed in p-Pb collisions at 5.02 TeV using a state-of-the-art hybrid model based on viscous relativistic hydrodynamics. We investigate the thermodynamic properties of the medium and final state observables. Our findings are compared with experimental data and first-principles calculations derived from lattice quantum chromodynamics. The results support the formation of a collective phase of strongly interacting matter in high-multiplicity p-Pb collisions.

    nucl-thhep-phPRC(2024)·14 citations
  3. 03

    Anisotropic electron transport in the nuclear pasta phase

    Mateus R. Pelicer🇧🇷 · Marco Antonelli🇫🇷 · Débora P. Menezes🇧🇷 · Francesca Gulminelli🇫🇷

    The presence of nuclear pasta is expected to modify the transport properties in the mantle of neutron stars. The non-spherical geometry of the pasta nuclear clusters leads to anisotropies in the collision frequencies, impacting the thermal and electrical conductivity. We derive analytical expressions for the anisotropic collision frequencies using the Boltzmann equation in the relaxation time approximation. The average parallel, perpendicular and Hall electrical conductivities are computed in the high-temperature regime above crustal melting, considering incoherent elastic electron-pasta scattering and randomly oriented pasta structures. Numerical values are obtained at different densities and temperatures by using the IUFSU parametrization of the non-linear Walecka model to determine the crustal structure. We find that the anisotropy of the collision frequencies grows with the length of the pasta structures and, independently of the magnetic field, the presence of rod and slab phases decreases the conductivity by more than one order of magnitude. Our numerical results indicate that, even if the pasta structures might survive above the crustal melting point, no strong anisotropies are to be expected in the conduction properties in this temperature regime, even in the presence of a very high magnetic field.

    nucl-thastro-ph.HEcond-mat.dis-nnMNRAS(2023)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE