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Nuclear Theory·nucl-th

Tuesday·November 1, 2022

9 papers—6 primary·3 cross-listed

All9Primary6Cross-lists3
  1. 01

    [Submitted on 30 Oct 2022]

    Production cross-sections of new superheavy elements with Z = 119-120 in fusion-evaporation reactions

    Zi-Han Wang · Peng-Hui Chen · Xiang-Hua Zeng · Zhao-Qing Feng

    We have calculated production cross sections of new superheavy elements with atomic number Z=119,120 in the fusion-evaporation reactions of Ca+Es, Ca+Fm, Sc+Es, Sc+Cf, Ti+Bk, Ti+Cf, V+Cm, V+Cf, Cr+Am, Cr+Cm, Mn+Pu, Mn+Am, Fe+Np, Fe+Pu, Co+U, Co+Np, Ni+Pa, Ni+U, Cu+Th, Cu+Pa, and Zn+Th within the dinuclear system model systematically. The inner fusion barriers have been extracted from the driving potential or potential energy surface which could be used to predict the relative fusion probability roughly. The influence of mass asymmetry of the colliding partners on the production of new superheavy elements (SHE) has been investigated systematically. It is found that fusion probability increase along with the increasing mass asymmetry of colliding systems. The Ti-induced reactions have the largest cross-sections of the new SHE. The dependence of production cross-sections of new superheavy elements on the isospin of projectile nuclei has been discussed. The new SHE of 119 has been predicted as the synthesis cross sections around serval picobarns in the Ti-induced reactions. Production cross-section of the element of 120 has been evaluated as large as 1 picobarn in the reactions Ti (Cf, 2n) 120 at = 26 MeV. The optimal projectile-target combinations and beam energies for producing new SHE with atomic number Z=119-120 are proposed for the forthcoming experiments.

    Comments:
    12 pages, 7 figures. arXiv admin note: text overlap with arXiv:2210.08941
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2210.16821 [pdf]
    Nucl.Phys.Rev.(2022)·2 citations
  2. 02

    [Submitted on 30 Oct 2022]

    Muonic-Atom Spectroscopy and Impact on Nuclear Structure and Precision QED Theory

    Aldo Antognini🇨🇭 · Sonia Bacca🇩🇪 · Andreas Fleischmann🇩🇪 · Loredana Gastaldo🇩🇪 · Franziska Hagelstein🇨🇭 · Paul Indelicato🇫🇷 · Andreas Knecht🇨🇭 · Vadim Lensky🇩🇪 · Ben Ohayon🇨🇭 · Vladimir Pascalutsa🇩🇪 · Nancy Paul🇫🇷 · Randolf Pohl🇩🇪 · Frederik Wauters🇩🇪

    Recent progress in laser and x-ray spectroscopy of muonic atoms offers promising long-term possibilities at the intersection of atomic, nuclear and particle physics. In muonic hydrogen, laser spectroscopy measurements will determine the ground-state hyperfine splitting (HFS) and additionally improve the Lamb shift by a factor of 5. Precision spectroscopy with cryogenic microcalorimeters has the potential to significantly improve the charge radii of the light nuclei in the range. Complementary progress in precision should be achieved on the theory of nucleon- and nuclear-structure effects. The impact of this muonic-atom spectroscopy program will be amplified by the upcoming results from H and He spectroscopy, simple molecules such as HD and Penning trap measurements. In this broader context, one can test ab-initio nuclear theories, bound-state QED for two- or three-body systems, and determine fundamental constants, such as the Rydberg () and the fine-structure () constants.

    Comments:
    8 pages, 2 figures, submitted as community input for the NuPECC Long Range Plan 2024 (https://indico.ph.tum.de/event/7050/)
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Atomic Physics (physics.atom-ph)
    arXiv:
    2210.16929 [pdf]
    16 citations
  3. 03

    [Submitted on 31 Oct 2022]

    Probing fluctuations and correlations of strangeness by net-kaon cumulants in Au+Au collisions at GeV

    Qian Chen🇨🇳 · Han-Sheng Wang🇨🇳 · Guo-Liang Ma🇨🇳

    We calculate the cumulants and correlation functions of net-kaon multiplicity distributions in Au+Au collisions at GeV using a multiphase transport model (AMPT) with both a new coalescence mechanism and all charge conservation laws. The AMPT model can qualitatively describe the centrality dependences of the net-kaon cumulants and cumulant ratios measured by the STAR experiment. By focusing on the stage evolution of the cumulants, cumulant ratios, and correlation functions, we reveal several key effects on the fluctuations and correlations of strangeness during the dynamical evolution of relativistic heavy-ion collisions, including strangeness production and diffusion, hadronization, hadronic rescatterings, and weak decays. Without considering the quantum chromodynamics critical fluctuations in the dynamic model, we demonstrate that the net-kaon fluctuations can largely represent the net-strangeness fluctuations. Our results provide a baseline for understanding the net-kaon and net-strangeness fluctuations, which help to search for the possible critical behaviors at the critical end point in relativistic heavy-ion collisions.

    Comments:
    11 pages, 7 figures; final published version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2210.17125 [pdf]
    PRC(2023)·6 citations
  4. 04

    [Submitted on 31 Oct 2022]

    Directed flow of from heavy-ion collisions and hyperon puzzle of neutron stars

    Akira Ohnishi🇯🇵 · Asanosuke Jinno🇯🇵 · Koichi Murase🇯🇵 · Yasushi Nara🇯🇵

    We examine the potential from the chiral effective field theory (EFT) via the directed flow from heavy-ion collisions. We implement the potential obtained from the EFT in a vector potential version of relativistic quantum molecular dynamics. We find that the potentials obtained from the EFT assuming weak momentum dependence reproduce the directed flow measured by the STAR collaboration in the Beam Energy Scan program. While the directed flow is not very sensitive to the density dependence of the potential, the directed flow at large rapidities is susceptible to the momentum dependence. Thus understanding the directed flow of hyperons in a wide range of beam energy and rapidity is helpful in understanding hyperon potentials in dense matter.

    Comments:
    Talk given at HYP2022 (the 14th International Conference on Hypernuclear and Strange Particle Physics), June 27-July 1, 2022, Prague, Czech Republic. 6 pages, 2 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2210.17202 [pdf]
    EPJ Web Conf.(2022)·3 citations
  5. 05

    [Submitted on 31 Oct 2022]

    The Fusion-by-Diffusion model as a tool to calculate cross sections for the production of superheavy nuclei

    T. Cap · M. Kowal · K. Siwek-Wilczyńska

    This article summarizes recent progress in our understanding of the reaction mechanisms leading to the formation of superheavy nuclei in cold and hot fusion reactions. Calculations are done within the Fusion-by-Diffusion (FBD) model using the new nuclear data tables by Jachimowicz et al. [At. Data Nucl. Data Tables 138, 101393 (2021)]. The synthesis reaction is treated in a standard way as a three-step process (i.e., capture, fusion, and survival). Each reaction step is analyzed separately. Model calculations are compared with selected experimental data on capture, fissionlike and fusion cross sections, fusion probabilities, and evaporation residue excitation functions. The role of the angular momentum in the fusion step is discussed in detail. A set of fusion excitation functions with corresponding fusion probabilities is provided for cold and hot synthesis reactions.

    Comments:
    submitted to EPJ A Topical Issue: Heavy and Super-Heavy Nuclei and Elements: Production and Properties
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2210.17214 [pdf]
    EPJA(2022)·10 citations
  6. 06

    [Submitted on 31 Oct 2022]

    Wavefunction matching for solving quantum many-body problems

    Serdar Elhatisari · Lukas Bovermann · Yuanzhuo Ma · Evgeny Epelbaum · Dillon Frame · Fabian Hildenbrand · Myungkuk Kim · Youngman Kim · Hermann Krebs · Timo A. Lähde · Dean Lee · Ning Li and 6 other authors

    Ab initio calculations play an essential role in our fundamental understanding of quantum many-body systems across many subfields, from strongly correlated fermions to quantum chemistry and from atomic and molecular systems to nuclear physics. One of the primary challenges is to perform accurate calculations for systems where the interactions may be complicated and difficult for the chosen computational method to handle. Here we address the problem by introducing a new approach called wavefunction matching. Wavefunction matching transforms the interaction between particles so that the wavefunctions up to some finite range match that of an easily computable interaction. This allows for calculations of systems that would otherwise be impossible due to problems such as Monte Carlo sign cancellations. We apply the method to lattice Monte Carlo simulations of light nuclei, medium-mass nuclei, neutron matter, and nuclear matter. We use high-fidelity chiral effective field theory interactions and find good agreement with empirical data. These results are accompanied by new insights on the nuclear interactions that may help to resolve long-standing challenges in accurately reproducing nuclear binding energies, charge radii, and nuclear matter saturation in ab initio calculations.

    Comments:
    24 pages, 10 figues, 13 tables. This version is the same as the version arXiv:2210.17488v2, and the final version is available at the Nature website
    Subjects:
    Nuclear Theory (nucl-th); Quantum Gases (cond-mat.quant-gas); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Quantum Physics (quant-ph)
    arXiv:
    2210.17488 [pdf]
    Nature(2024)·110 citations

Affiliations

first authorsco-authorsvia INSPIRE