PaperPanorama
FAQ

Nuclear Theory·nucl-th

Tuesday·August 27, 2024

11 papers—6 primary·5 cross-listed

All11Primary6Cross-lists5
  1. 01

    Bound states of Be and He nuclei with ++ and ++ cluster models

    Igor Filikhin🇺🇸 · Roman Ya. Kezerashvili🇺🇸 · Branislav Vlahovic🇺🇸

    We investigate the Be and He mesic nuclei within the framework of the three-body cluster model as the ++ and ++ systems, using the Faddeev formalism in configuration space. The - potential is determined through a folding procedure of the HAL QCD - interaction in the channel with the matter distribution of He. The phenomenological - and - potentials are taken from the literature. Additionally, we construct a Wood-Saxon (WS) type interaction to simulate the - potential, also taken from the literature, based on an effective Lagrangian approach that includes meson loops in the -meson self-energy. A comparison of binding energies obtained for both types of the - interactions reveals qualitative agreement. %between the obtained approaches. We predict the binding energy for the Be and He mesic nuclei as the mirror ++ and ++ systems in the range of 1-11 MeV and 3-10 MeV, respectively. The range of values of the binding energies relies on the choice of the WS - interaction parameters.

    nucl-thPRC(2024)·12 citations
  2. 02

    Evaluation of fission fragment moments of inertia for spontaneous fission of Cf-252

    D.E. Lyubashevsky · P.V. Kostryukov · A.A. Pisklyukov · J.D. Shcherbina

    Current work discusses methods for estimating the moments of inertia of fission fragments for spontaneous fission of the isotope Cf-252, in particular, two main approaches are mentioned: statistical and microscopic. In addition, the methods of the classical and superfluid approaches to the calculation of the moments of inertia are discussed, as well as their application to different models of nuclei. Within this framework, the influence of different oscillation modes and nucleon exchange on the moments of inertia and spin distributions of fission fragments is evaluated. The authors emphasizes the need for a comparative analysis of theoretical predictions with experimental data for a deeper understanding of the internal structure of nuclei and fission mechanisms.

    nucl-thCPC(2025)·2 citations
  3. 03

    Bubble Ar and Its New Breathing Modes

    Ge Ren · Chun-Wang Ma · Xi-Guang Cao · Yu-Gang Ma

    The bubble nuclei are important components of exotic nuclear structures characterized by special depletions of central densities. Focusing on bubble structures of Ar, the characterizations of bubble nuclei were explored with the framework of the extended quantum molecular dynamics model. Three density distribution modes were uncovered for the first time, i.e. micro-bubble, bubble, and cluster resonances, which show unique spectral signature compared to the monopole resonance spectrum as the excitation intensity was increased in bubbles. Of pivotal importance is the revelation that the bubble mode's oscillation frequency closely resembles macroscopic bubble dynamics, building a connection between classical macroscopic phenomena and the quantum complexity of the nuclear structure. The discovery marks a crucial step forward in deciphering the relationship between classical and quantum domains within the enigmatic world of atomic nuclei.

    nucl-thPLB(2024)·6 citations
  4. 04

    Convergence of the hydrodynamic gradient expansion in relativistic kinetic theory

    Lorenzo Gavassino

    We rigorously prove that, in any relativistic kinetic theory whose non-hydrodynamic sector has a finite gap, the Taylor series of all hydrodynamic dispersion relations has a finite radius of convergence. Furthermore, we prove that, for shear waves, such radius of convergence cannot be smaller than times the gap size. Finally, we prove that the non-hydrodynamic sector is gapped whenever the total scattering cross-section (expressed as a function of the energy) is bounded below by a positive non-zero constant. These results, combined with well-established covariant stability criteria, allow us to derive a rigorous upper bound on the shear viscosity of relativistic dilute gases.

    nucl-thastro-ph.HEhep-thPRD(2024)·11 citations
  5. 05

    Analysis of flow factorization and event-plane correlations based on a maximum likelihood estimator

    Chong Ye🇨🇳 · Cesar A. Bernardes🇧🇷 · Wei-Liang Qian🇨🇳 · Sandra S. Padula🇧🇷 · Rui-Hong Yue🇨🇳 · Yogiro Hama🇧🇷 · Takeshi Kodama🇧🇷

    In this study, we use the maximum likelihood estimator (MLE) to explore factorization and event-plane correlations in relativistic heavy-ion collisions. Our analyses incorporate both numerical simulations and publicly available data from the CMS Collaboration. We focus on Au+Au collisions at 200 GeV and Pb+Pb collisions at 2.76 TeV. The differential flows obtained for various centrality windows and momentum cuts are consistent with conventional methodologies such as multi-particle cumulants and event-plane methods. Leveraging these findings, we proceed to undertake further analysis of flow factorization and event-plane correlations. These quantities are relevant because of their sensitivity to initial-state fluctuations. While higher-order correlators might provide different implementations of factorization ratio, the MLE estimator is readily applied to these scenarios. Moreover, MLE's unique capabilities allow us to compute specific correlators that are typically inaccessible by other means. As an asymptotically normal and unbiased estimator, MLE provides a valuable alternative tool for flow and correlation analysis.

    nucl-th3 citations
  6. 06

    Collisional and radiative energy loss in small systems

    Coleridge Faraday🇿🇦 · W. A. Horowitz🇿🇦

    We present an energy loss model which includes small system size corrections to both the radiative and elastic energy loss. Our model is used to compute the nuclear modification factor of light and heavy flavor hadrons, averaged over realistic collision geometries for central and peripheral and central collisions at LHC and RHIC. We find that the predicted suppression in small systems is almost entirely due to elastic energy loss. Our results are keenly sensitive to the crossover between elastic energy loss calculated with hard thermal loop propagators and vacuum propagators, respectively, which leads to a large theoretical uncertainty. We find that the is largely insensitive to the form of the elastic energy loss distribution - Gaussian or Poisson - surprisingly so in small systems where the central limit theorem is inapplicable. We present an expansion of the in terms of the moments of the energy loss probability distribution, which allows for a rigorous understanding of the dependence of the on the underlying energy loss distribution.

    nucl-thhep-phPRC(2025)·11 citations

Affiliations

first authorsco-authorsvia INSPIRE