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Nuclear Theory·nucl-th

Monday·March 3, 2025

4 papers—3 primary·1 cross-listed

All4Primary3Cross-lists1
  1. 01

    [Submitted on 28 Feb 2025]

    Continuum Effects and the Trojan Horse Mechanism in Halo Nuclei-Induced Reactions: Implications for Heavy Isotope Synthesis

    Jin Lei

    Nonelastic breakup (NEB) reactions induced by the halo nucleus Be on Zn at 28.7 MeV are investigated using the Ichimura-Austern-Vincent (IAV) model combined with the Continuum Discretized Coupled Channels (CDCC) method. NEB cross sections calculated with full CDCC wave functions (including continuum states), ground-state-only CDCC wave functions, and single-channel calculations are compared. The results indicate that continuum effects are negligible and that NEB cross sections are dominated by the ground-state contribution. This validates the use of simpler models like the distorted wave Born approximation for such reactions. Additionally, by varying the binding energy in a toy model, the feasibility of using halo nuclei in the Trojan Horse Method (THM) for synthesizing heavy isotopes is explored. It is demonstrated that THM significantly enhances sub-barrier fusion cross sections due to the weak binding of halo nuclei, offering a promising approach for the synthesis of new elements.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2502.20672 [pdf]
    PRC(2025)·2 citations
  2. 02

    [Submitted on 28 Feb 2025]

    Bound-state formation and thermalization within the Lindblad approach

    Jan Rais🇩🇪 · Hendrik van Hees🇩🇪 · Carsten Greiner🇩🇪

    The Lindblad equation, as one approach to open quantum systems, describes the density matrix of a particle or a chain of interacting particles, which are in contact with a thermal bath. Still, it is not fully understood yet, how arbitrary systems evolve towards a stationary distribution, which guarantees thermalization in a thermodynamical context, and how to systematically incorporate the variety of assumptions that are made in this approach in order to preserve thermal Gibbs states. Despite these shortcomings, Lindblad dynamics was successfully employed in heavy-ion physics (quarkonia) and also became of interest in quantum-computer applications. In this paper, we consider a problem borrowed from heavy-ion collisions, namely the formation of bound states, as for example the deuteron, in the non-relativistic regime by using the already well understood techniques of Lindblad dynamics. However, only recently, we were able to extend this toolbox by showing, that the position-space Lindblad equation can be reformulated in terms of a diffusion-advection equation with sources and therefore provides a hydrodynamical formulation of a dissipative quantum master equation. Making use of this advanced machinery and insights, we describe the possible formation of a bound state, which is realized by a Pöschl-Teller-like potential, of a particle in interaction with a heat bath in a 1-dim setting. We analyse the possibility of a thermalization and the time-scale of the formation, population and depopulation of the bound state. Finally, we also show an example of a much deeper potential, where we allow for three bound states, just in the spirit of quarkonia. Besides this, we discuss general aspects of open quantum systems, like decoherence, entropy production etc.

    Comments:
    30 pages, 33 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Quantum Physics (quant-ph)
    arXiv:
    2502.21047 [pdf]
    1 citation
  3. 03

    [Submitted on 28 Feb 2025]

    Charge symmetry breaking in hypernuclei within RMF model

    Ting-Ting Sun🇨🇳 · Yusuke Tanimura🇰🇷 · Hiroyuki Sagawa🇯🇵 · Emiko Hiyama🇯🇵

    We study the charge symmetry breaking (CSB) effect in the binding energy of mirror hypernuclei in the mass region in relativistic mean field (RMF) models introducing and interactions. The phenomenological CSB interaction is introduced and the strength parameter is fitted to reproduce the experimental binding energy difference between the mirror hypernuclei B and C. This model is applied to calculate the CSB energy anomaly in mirror hypernuclei with the mass . The model is further applied to predict the binding energy difference of mirror hypernuclei of =40 with the isospin , and nuclei together with various hyper Ca isotopes and their mirror hypernuclei. Finally the binding energy systematics of 48 hypernuclei are predicted with/without the CSB effect by the PK1 and TM2 energy density functionals (EDFs).

    Comments:
    4 figures, 2 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2502.21161 [pdf]
    PLB(2025)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE