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Nuclear Theory·nucl-th

Friday·June 6, 2025

9 papers—3 primary·6 cross-listed

All9Primary3Cross-lists6
  1. 01

    [Submitted on 3 Jun 2025]

    Nuclear Quantum Many-Body Dynamics: From Collective Vibrations to Heavy-Ion Collisions (2nd edition)

    Cédric Simenel🇦🇺

    New edition of the review [EPJA 48, (2012) 152]. The increase in computational power has naturally led to new applications of mean-field (and beyond) methods. This is particularly the case of quasi-fission reactions. Since the first edition, significant progress has also been made in treating pairing correlations dynamically, leading to realistic applications in multi-nucleon transfer, fusion and fission reactions. A new section has been added on fission dynamics. A summary of recent researches on nuclear dynamics with realistic microscopic quantum approaches is presented. The Balian-Veneroni variational principle is used to derive the time-dependent Hartree-Fock (TDHF) equation describing the dynamics at the mean-field level, as well as an extension including small-amplitude quantum fluctuations which is equivalent to the time-dependent random-phase approximation (TDRPA). Such formalisms as well as their practical implementation in the nuclear physics framework with modern three-dimensional codes are discussed. Recent applications to nuclear dynamics, from collective vibrations to heavy-ion collisions are presented. A particular attention is devoted to the interplay between collective motions and internal degrees of freedom. For instance, the harmonic nature of collective vibrations is questioned. Large amplitude collective motions are investigated in the framework of heavy-ion collisions and fission. How fusion is affected by the internal structure of the collision partners, such as their deformation, is discussed. Other mechanisms in competition with fusion, and responsible for the formation of fragments which differ from the entrance channel (transfer reactions, deep-inelastic collisions, and quasi-fission) are investigated. Finally, studies of actinide collisions forming, during very short times of few zeptoseconds, the heaviest nuclear systems available on Earth, are presented.

    Comments:
    71 pages. Review article. arXiv admin note: substantial text overlap with arXiv:1209.3375
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2506.04261 [pdf]
    EPJA(2025)·17 citations
  2. 02

    [Submitted on 5 Jun 2025]

    The quark-gluon plasma: diagnosis with thermal hadron production from the early history until detailed characterization at high energy colliders

    Peter Braun-Munzinger · Krzysztof Redlich · Johanna Stachel

    In nuclear collisions at relativistic energies, matter is created which resembles closely the matter that filled all space until about 15 microseconds after the big bang. Here we summarize selected aspects of the research that led to the establishment of this new sub-field of physics and briefly describe its current `state of the art' with emphasis on matter creation through thermal particle production. In particular, we will focus on particle production at low transverse momentum and explain how its analysis sheds light on one of the key open questions, i.e. what is the mechanism of hadronization of colored objects such as quarks and gluons.

    Comments:
    Contribution to: Quark Gluon Plasma at Fifty -- A commemorative Journey, Publisher: Springer Nature Switzerland AG, Editors: Tapan Nayak, Marco Van Leeuwen, Steffen Bass, Claudia Ratti, James Dunlop
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2506.04733 [pdf]
    3 citations
  3. 03

    [Submitted on 5 Jun 2025]

    The Be photodisintegration cross section within Cluster Effective Field Theory

    Ylenia Capitani🇮🇹 · Elena Filandri🇮🇹 · Chen Ji🇨🇳 · Winfried Leidemann🇮🇹 · Giuseppina Orlandini🇮🇹

    A low-energy calculation of Be photodisintegration cross section is presented within an cluster approach. The and contact interactions are derived from cluster effective field theory. The two-body potentials defined in momentum space are regularized by a Gaussian cutoff. The associated low-energy constants are found by comparing the calculated low-energy T-matrix with its effective range expansion. A three-body state-dependent potential is also introduced in the model. First, the Be three-body binding energy is studied within the non-symmetrized hyperspherical harmonics method. Then, the low-energy cross section is calculated via the Lorentz integral transform method, focussing on the dominant electric dipole transitions. A twofold evaluation of the nuclear current matrix element is presented, employing both the electric dipole transition operator (Siegert theorem) and the one-body convection current operator. This approach is adopted to allow for a discussion of the effect of the many-body currents.

    Comments:
    16 pages, 16 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2506.05040 [pdf]
    PRC(2025)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE