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Nuclear Theory·nucl-th

Tuesday·June 10, 2025

15 papers—4 primary·11 cross-listed

All15Primary4Cross-lists11
  1. 01

    Charge symmetry breaking effects of - mixing in relativistic mean-field model

    Yusuke Tanimura🇰🇷 · Tomoya Naito🇯🇵 · Hiroyuki Sagawa🇯🇵 · Myung-Ki Cheoun🇰🇷

    We present a relativistic mean-field model that incorporates charge symmetry breaking (CSB) of nuclear force via - meson mixing, along with corrections to the electromagnetic interaction including the nucleon form factors, first-order vacuum polarization, and Coulomb exchange and pairing terms. The model parameters are refitted using the mass differences of mirror nuclei and ground-state properties of magic nuclei, yielding DD-ME-CSB parameter set. The DD-ME-CSB parameter set reproduces the mass differences of mirror nuclei reasonably well up to , demonstrating the importance of - mixing. A connection of the present model to a Skyrme-type CSB interaction is also established through a gradient expansion of the energy density functional.

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

    Effects of vibration and rigidity modes of motion on the spectral statistics of spherical nuclei

    H. Sabri · A. Hosseinnezhad

    In this paper, we investigated the effects of \b{eta}-vibration and \b{eta}-rigidity on the energy levels from the viewpoint of statistical fluctuations of nuclear systems. To this aim, a parameter-free collective solution of the Bohr Hamiltonian in the five-dimensional harmonic oscillator potential with a linear energy dependence and an asymptotic limit of the slope are used to determine all of the observed normal states in even-even nuclei with ~ 2.00 - 2.15 ratio in the A ~ 90 -140 mass region. Different sequences are prepared of the energy levels, both experimental values and theoretical predictions, which are categorized as their spin-parity, \b{eta} oscillator quanta, and seniority numbers and analyzed in the framework of random matrix theory to show their statistical situation in comparison with regular and correlated limits. Also, up to 2226 levels with the same 2+ spin-parity assignment are determined for different systems in which the stiffness parameter for them changed between a = 0 and a =1 limits and then analyzed in the same process. The results showed a transition between correlated behavior and regularity when the rigidity increased in considered systems. Also, there are apparent relations between the chaocity degrees of considered sequences and the considered criteria for classifications.

    nucl-th0 citations
  3. 03

    What is the Quark-Gluon Plasma made of?

    Berndt Müller🇺🇸

    This article surveys our present understanding of the internal structure of the fully developed quark-gluon plasma at temperatures outside the crossover region. The theoretical part of the review covers perturbative and nonperturbative approaches to quark-gluon plasma structure, in particular, hard-thermal loop effective theory, lattice QCD and the functional renormalization group. The phenomenological part of the review scrutinizes the information that has been derived from bulk observables and hard probes in relativistic heavy ion collisions in terms of how it informs our knowledge about the structure of the quark-gluon plasma. The final section lists possible avenues for future progress.

    nucl-thhep-ph3 citations
  4. 04

    Dependence of angular momentum of fission fragments on total kinetic energy in spontaneous fission of Cf

    A. Rahmatinejad (1) · T. M. Shneidman (1) · G.G. Adamian (1) · N.V. Antonenko (1,2) ((1) Joint Institute for Nuclear Research, Russia, (2) Tomsk Polytechnic University, Russia)

    A weak dependence of the angular momentum of Ba fragments, produced in the spontaneous fission of Cf, on the total kinetic energy (TKE) was recently observed \cite{Giha2025}. To investigate this phenomenon, we propose a model describing the evolution of the fissioning nucleus toward scission. The model assumes that after tunneling through the fission barrier, the nucleus can be represented by a superposition of dinuclear systems (DNS). We calculate main fission observables, including mass, TKE, and neutron multiplicity distributions, and compare them with experimental data. The angular motion in the DNS is treated quantum-mechanically, yielding the angular momentum distribution of DNS nuclei at scission configurations leading to Ba fragments. Within this framework, we successfully reproduce and explain the experimentally observed dependence of the average angular momentum of Ba on TKE.

    nucl-thPRC(2025)·1 citation

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first authorsco-authorsvia INSPIRE