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Nuclear Theory·nucl-th

Thursday·February 20, 2025

5 papers—4 primary·1 cross-listed

All5Primary4Cross-lists1
  1. 01

    Non-local high- transport in anisotropic QCD matter

    João Barata🇨🇭 · Xiaojian Du🇪🇸 · Andrey V. Sadofyev🇵🇹

    We perform a numerical study of non-local partonic transport in anisotropic QCD matter, relevant to the evolution of hard probes in the aftermath of high-energy nuclear scattering events. The recently derived master equation, obtained from QFT considerations, differs from Boltzmann transport by incorporating a non-local elastic scattering kernel arising from density gradients. After rewriting the master equation in a form suitable for numerical implementation and assuming a static density profile, we compare the non-local evolution to Boltzmann transport, demonstrating that the new interaction kernel is essential for accurately describing the azimuthal structure of the final-state momentum distribution. We further study the non-local partonic transport in the case of a matter profile governed by two-dimensional hydrodynamics, accounting for its flow and generalizing the evolution equation. Our results demonstrate the necessity of going beyond classical transport at high- to accurately capture the structure of jets propagating through structured QCD matter. The master equation used in the numerical simulations can be seamlessly integrated into state-of-the-art transport codes.

    nucl-thhep-phPRD(2025)·10 citations
  2. 02

    Perturbative quantum Monte Carlo calculation with high-fidelity nuclear forces

    Jun Liu🇨🇳 · Teng Wang🇨🇳 · Bing-Nan Lu🇨🇳

    Quantum Monte Carlo (QMC) is a family of powerful tools for addressing quantum many-body problems. However, its applications are often plagued by the fermionic sign problem. A promising strategy is to simulate an interaction without sign problem as the zeroth order and treat the other pieces as perturbations. According to this scheme, we construct precision nuclear chiral forces on the lattice and make perturbative calculations around a sign-problem-free interaction respecting the Wigner-SU(4) symmetry. We employ the recently developed perturbative QMC (ptQMC) method to calculate the perturbative energies up to the second order. This work presents the first ptQMC calculations for two-body next-to-next-to-next-to leading order (NLO) chiral forces and elucidates how the hierarchical nature of the chiral interactions helps organize and simplify the ptQMC calculations. We benchmark the algorithm for the deuteron, where exact solutions serve as rigorous reference points. We also reproduce the famous Tjon line by correlating the perturbative He binding energies with the non-perturbative H binding energies. These comprehensive demonstrations underscore the efficacy of ptQMC in resolving high-fidelity nuclear interactions, establishing its potential as a robust tool for \textit{ab initio} nuclear structure studies.

    nucl-thEPJA(2025)·13 citations
  3. 03

    Nuclear -cluster structures from valence-space microscopic cluster model

    Zhen Wang · Dong Bai · Zhongzhou Ren

    Alpha clustering is an important dynamic in nuclear physics, with growing interest to its study in heavy nuclei in recent years. Theoretically, the microscopic cluster models taking nucleons as relevant degrees of freedom have been widely used to study -cluster structures in light nuclei. However, a straightforward application on same footing in heavy nuclei is obstructed by the complexity of handling numerous nucleons. As a simplified alternative, the macroscopic cluster models built upon cluster degrees of freedom are usually employed in heavy nuclei, though these approaches typically lose several critical structural details. In this work, we propose to study the -cluster structures within the framework of valence-space microscopic cluster model (VS-MCM), which is a hybrid between microscopic and macroscopic cluster models and inherits features from both models, making it capable to investigate the -cluster structures in heavy nuclei from a relatively microscopic viewpoint. In VS-MCM, the valence clusters are described by antisymmetrized microscopic wave functions, with single-particle orbits in core nuclei removed systematically from the model space via the Pauli projection to simulate the antisymmetrization between clusters and doubly magic cores. As a proof of principle, we apply the VS-MCM to study the -cluster structures in Ne and Ti at first, with the theoretical energy levels of the bands for Ne and Ti showing reasonable agreement with experimental data. These calculations lay the foundation for future applications of VS-MCM in general cluster structures across the nuclide chart, where more clusters and valence nucleons can exist outside the heavy doubly magic core, opening new avenues to study the and cluster decays in heavy nuclei microscopically.

    nucl-thPLB(2025)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE