PaperPanorama
FAQ

Nuclear Theory·nucl-th

Monday·February 17, 2025

12 papers—3 primary·9 cross-listed

All12Primary3Cross-lists9
  1. 01

    [Submitted on 14 Feb 2025]

    Improvement to Generalized Separable Expansion Method in Lippmann-Schwinger Equation

    Hiroyuki Kamada

    Realistic nucleon-nucleon (NN) potentials are generally not in separable form, but there is a way to convert them into separable potentials, called the generalized separable expansion (GSE). When the separable potential is substituted into a three-body Faddeev equation, which generally has two Jacobi momenta, the integral equation is conveniently reduced to a one-variable integral equation. The two-body scattering t-matrix of the conventional GSE does not have an exact singularity at the energy threshold of the two-body bound state. The newly introduced GSE improves this by treating the singularity analytically.

    Comments:
    8pages, no figure
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2502.09911 [pdf]
    PTEP(2025)·8 citations
  2. 02

    [Submitted on 14 Feb 2025]

    Chiral symmetry and peripheral neutron- scattering

    Yilong Yang · Evgeny Epelbaum · Jie Meng · Lu Meng · Pengwei Zhao

    We propose and demonstrate that peripheral neutron- scattering at low energies can serve as a sensitive and clean probe of the long-range three-nucleon forces. To this aim, we perform {\it ab initio} quantum Monte Carlo calculations using two- and three-nucleon interactions derived in chiral effective field theory up to third expansion order. We show that the longest-range three-nucleon force stemming from the two-pion exchange plays a crucial role in the proper description of the neutron- -wave phase shifts. Our Letter reveals the predictive power of chiral symmetry in the few-body sector and opens a new direction for probing and constraining three-nucleon forces.

    Comments:
    6 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2502.09961 [pdf]
    PRL(2025)·18 citations
  3. 03

    [Submitted on 14 Feb 2025]

    Modeling of acceleration in heavy-ion collisions: occurrence of temperature below the Unruh temperature

    G. Yu. Prokhorov🇷🇺 · D. A. Shohonov🇷🇺 · O. V. Teryaev🇷🇺 · N. S. Tsegelnik🇷🇺 · V. I. Zakharov🇷🇺

    It has recently been shown that extremely strong electric fields can be created in central collisions of heavy ions, due to which the Schwinger effect can be significant. A direct analogue of the electric field in hydrodynamics is the acceleration of the medium. Using the parton-hadron-string dynamics (PHSD) framework we model the Au-Au collisions at intermediate collision energies GeV and obtain the spatial distribution of acceleration at different time moments. The present study demonstrates that extremely high acceleration of the order of 1 GeV may be generated in both central and non-central collisions, and that the distribution exhibits a core-corona structure. Consequently, in contrast to the case with an electric field, the Unruh effect is expected to be significant. It is demonstrated that for the confined phase the temperature is less than the Unruh temperature. Conversely, in the deconfined phase, the relationship is inverse. The obtained results thus support the prediction about the existence of states with at the early stages of the collision and the associated complementary description of thermalization in terms of the novel phase transition at the Unruh temperature.

    Comments:
    15 pages, 7 figures, To appear in Physical Review C
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
    arXiv:
    2502.10146 [pdf]
    PRC(2025)·16 citations

Affiliations

first authorsco-authorsvia INSPIRE