PaperPanorama
FAQ

Nuclear Theory·nucl-th

Friday·January 21, 2022

13 papers—5 primary·8 cross-listed

All13Primary5Cross-lists8
  1. 01

    [Submitted on 20 Jan 2022]

    The LiBe reaction rate in the light of the new LUNA data

    S. B. Dubovichenko · A. S. Tkachenko · R. Ya. Kezerashvili · N. A. Burkova · A. V. Dzhazairov-Kakhramanov

    We present new calculations of the astrophysical factor and reaction rate for the LiBe reaction at energies of 10 keV to 5 MeV in the framework of a modified potential cluster model with forbidden states, including low lying resonances. The astrophysical factor is compared with the available experimental data and calculations done within different models. The results for the factor are in good agreement with the data set (for MeV) and calculations (for MeV) of LUNA collaboration (Phys. Rev. C 102 052802, 2020). The recommended extrapolated zero value turned out to be 101 eV b. Using the theoretical total cross-sections the LiBe capture reaction rate is calculated at temperatures ranging from 0.01 to 10 and compared with NACRE and NACRE II. Analytical expressions for the factor and reaction rate are given, and the effect of low-lying resonances on the reaction rate is estimated. We suggest to update the NACRE and NACRE II databases in light of the new LUNA data and present calculations.

    Comments:
    17 pages, 10 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2201.07987 [pdf]
    PRC(2022)·17 citations
  2. 02

    [Submitted on 20 Jan 2022]

    Sub-barrier fusion reactions

    K. Hagino

    The concept of compound nucleus was proposed by Niels Bohr in 1936 to explain narrow resonances observed in scattering of a slow neutron off atomic nuclei. A compound nucleus is a metastable state with a long lifetime, in which all the degrees of freedom are in a sort of thermal equilibrium. Fusion reactions are defined as reactions to form such compound nucleus by merging two atomic nuclei. Here a short description of heavy-ion fusion reactions at energies close the Coulomb barrier is presented. This includes: (i) an overview of a fusion process, (ii) a strong interplay between nuclear structure and fusion, (iii) fusion and multi-dimensional/multi-particle quantum tunneling, and (iv) fusion for superheavy elements.

    Comments:
    26 pages, 19 figures. Contribution to the "Handbook of Nuclear Physics", Springer, 2022, I. Tanihata, H. Toki and T. Kajino, eds
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2201.08061 [pdf]
    5 citations
  3. 03

    [Submitted on 20 Jan 2022]

    Strangeness and baryon-baryon interactions in chiral effective field theory

    J. Haidenbauer🇩🇪 · U.-G. Meißner🇩🇪

    Studies of the baryon-baryon interaction involving hyperons within chiral effective field theory, so far performed up to next-to-leading order (NLO) in the chiral expansion, have shown that for the strangeness (, ) and (, ) sectors a consistent and satisfactory description of the available scattering data and experimental constraints can be achieved based on the assumption of broken SU(3) flavor symmetry. We explore the possible extension of this approach at the NLO level to strangeness and baryon-baryon systems where empirical information is rather scarce. Specifically we address the question how measurements of two-body correlation functions in heavy-ion collisions and/or in high-energetic proton-proton collisions can help to constrain the interaction in channels like or .

    Comments:
    10 pages, 3 figures, contribution to Chiral Dynamics 2021
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2201.08238 [pdf]
    PoS(2024)·6 citations
  4. 04

    [Submitted on 20 Jan 2022]

    On the Stability of Superheavy Nuclei

    Krzysztof Pomorski🇵🇱 · Artur Dobrowolski🇵🇱 · Bozena Nerlo-Pomorska🇵🇱 · Michal Warda🇵🇱 · Johann Bartel🇫🇷 · Zhigang Xiao🇨🇳 · Yongjing Chen🇨🇳 · Lile Liu🇨🇳 · Jun-Long Tian🇨🇳 · Xinyue Diao🇨🇳

    Potential energy surfaces of even-even superheavy nuclei are evaluated within the macroscopic-microscopic approximation. A very rapidly converging analytical Fourier-type shape parametrization is used to describe nuclear shapes throughout the periodic table, including those of fissioning nuclei. The Lublin Strasbourg Drop and another effective liquid-drop type mass formula are used to determine the macroscopic part of nuclear energy. The Yukawa-folded single-particle potential, the Strutinsky shell-correction method, and the BCS approximation for including pairing correlations are used to obtain microscopic energy corrections. The evaluated nuclear binding energies, fission-barrier heights, and Q-alpha energies show a relatively good agreement with the experimental data. A simple one-dimensional WKB model a la Swiatecki is used to estimate spontaneous fission lifetimes, while alpha-decay probabilities are obtained within a Gamow-type model.

    Comments:
    13 pages, 19 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2201.08268 [pdf]
    EPJA(2022)·17 citations
  5. 05

    [Submitted on 20 Jan 2022]

    Volume extrapolation via eigenvector continuation

    Nuwan Yapa🇺🇸 · Sebastian König🇺🇸

    We develop an extension of eigenvector continuation (EC) that makes it possible to extrapolate simulations of quantum systems in finite periodic boxes across large ranges of box sizes. The formal justification for this approach, which we call finite-volume eigenvector continuation (FVEC), is provided by matching periodic functions at different box sizes. As concrete FVEC implementation we use a discrete variable representation based on plane-wave states and present several applications calculated within this framework.

    Comments:
    7 pages, 4 figures, published version
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2201.08313 [pdf]
    PRC(2022)·21 citations

Affiliations

first authorsco-authorsvia INSPIRE