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Nuclear Theory·nucl-th

Wednesday·October 19, 2022

8 papers—3 primary·5 cross-listed

All8Primary3Cross-lists5
  1. 01

    [Submitted on 18 Oct 2022]

    Fission Fragments Mass Yields of Actinide Nuclei

    Krzysztof Pomorski · Bożena Nerlo-Pomorska

    A new, rapidly convergent Fourier over spheroid parametrization is developed to describe the shape of a fissioning nucleus: its elongation, non-axiality and left-right asymmetry and neck formation. The 4D Potential Energy Surfaces (PES) of even-even actinide nuclei are evaluated within the macro-micro model. The Langevin trajectories generated on such PESs allow for obtaining the fission fragments' mass and kinetic energy yields. The charge equilibration at the scission configuration and the post-scission neutron emission are also discussed.

    Comments:
    Seminar given at the Zakopane Conference on Nuclear Physics, Zakopane, Aug. 29th - Sep. 4th, 2022. 10 pages and 6 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2210.09637 [pdf]
    Acta Phys.Polon.Supp.(2023)·8 citations
  2. 02

    [Submitted on 18 Oct 2022]

    First-order QCD transition in a primordial magnetic field

    Gaoqing Cao🇨🇳

    Recalling the expectation of an extremely strong primordial magnetic field , we recheck transitions among the phases of chiral symmetry restoration (), chiral symmetry breaking (), and pion superfluidity ()in the QCD epoch of the early Universe. For homogeneous phases in a finite , a sensible scheme is adopted to determine the phase boundaries of , which is also superconductivity phase itself. In the first part, the QCD phase diagrams are studied in detail within the chiral effective Polyakov-Nambu--Jona-Lasinio model and the transitions involving are found to be of first order at relatively small . As expected from the Meissner effect, the regime of shrinks with increasing and completely vanishes beyond a threshold value. In the second part, the bubble dynamics is illuminated for the stronger first-order transition, , in the more convenient Polyakov-quark-meson model. The coupled equations of motion of pion condensate and magnetic field are solved consistently to give the bubble structure. Then, based on bubble collisions, we explore gravitational wave (GW) emission by developing a simple toy model in advance; and the characteristic frequency of the relic GW is estimated to be of the order or in our galaxy.

    Subjects:
    Nuclear Theory (nucl-th); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2210.09794 [pdf]
    PRD(2023)·7 citations
  3. 03

    [Submitted on 18 Oct 2022]

    Extended superscaling with two-particle emission in electron and neutrino scattering

    V.L. Martinez-Consentino🇪🇸 · J.E. Amaro🇪🇸 · P.R. Casale🇪🇸 · I. Ruiz Simo🇪🇸

    An extended superscaling analysis of quasielastic electron scattering data is proposed by parametrizing the scaling function as the sum of a symmetric function corresponding to the emission of a single particle plus a contribution from the phase space of two-particle emission. The phase space of two-particle emission (2p2h) is multiplied by a q-dependent parameter that has been fitted to describe the tail behavior of the scaling function. This approach allows for an alternative description of the quasielastic electron scattering data, incorporating the contributions from both single-particle and two-particle emission processes induced by the one-body current and explaining the asymmetry of the scaling function. In a factorized schematic model based on the independent-pair approximation, the 2p2h parameter is related to the high-momentum distribution of the pair averaged over 2p-2h excitations. However, in the phenomenological fitting approach undertaken here, this coefficient includes other contributions such as interference with two-body currents and effects of the final-state interactions. We present predictions for the inclusive two-nucleon emission cross section induced by electrons and neutrinos.

    Comments:
    15 pages, 8 figures. Major revision, changed title and abstract
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2210.09982 [pdf]
    PRD(2023)·14 citations

Affiliations

first authorsco-authorsvia INSPIRE