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Nuclear Theory·nucl-th

Monday·March 3, 2025

4 papers—3 primary·1 cross-listed

All4Primary3Cross-lists1
  1. 01

    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.

    nucl-thPRC(2025)·2 citations
  2. 02

    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.

    nucl-thhep-phquant-ph1 citation
  3. 03

    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).

    nucl-thPLB(2025)·8 citations
  4. 04

    Probing double hadron resonance by complex momentum representation method

    Wen-Wan He🇨🇳 · Mao Song🇨🇳 · Jian-You Guo🇨🇳 · Xuan Luo🇨🇳 · Gang Li🇨🇳

    Resonances are ubiquitous phenomena in nature, and physicists have developed many methods to explore resonant states. Of particular note is the complex momentum representation(CMR) method, which has been developed and widely used in the study of resonant states in atomic, molecular and nuclear physics. Here, for the first time, we have developed this novel method to study hadron resonant states. The CMR method is applied to probe the bound and resonant states for the and systems, in which the resonant states are exposed clearly in complex momentum plane and the resonance parameters can be determined precisely without imposing unphysical parameters. The results show that the CMR method has achieving higher accuracy than other widely used methods. This method is not only very effective for narrow resonances, but also can be reliably applied to broad resonances.

    ↳ hep-phnucl-thPRD(2025)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE