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Nuclear Theory·nucl-th

Tuesday·December 27, 2022

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 01

    [Submitted on 26 Dec 2022]

    Diquarkyonic matter: quarks, diquarks and baryons

    Aaron Park🇰🇷 · Su Houng Lee🇰🇷

    In this work, we investigate the color-spin interaction of a quark, a diquark and a baryon with their surrounding baryons and/or quark matter. We extend our previous work by increasing the maximum number of surrounding baryons to 5 and additionally consider all possible diquark probes that are immersed in such surroundings. This is accomplished by classifying all possible flavor and spin states of the resulting multiquark configuration in both the flavor SU(2) and SU(3) symmetric cases. We also discuss the three-body confinement potential and show that this does not contribute to the outcome. Furthermore, we find that a quark becomes more stable than a baryon when the number of surrounding baryons is three or more. Finally, when we consider the internal color-spin factor of a probe, our results show that the effects of the color-spin interaction of a multiquark configuration is consistent with the so-called diquarkyonic configuration.

    Comments:
    24 pages
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2212.13030 [pdf]
    PRD(2023)·4 citations
  2. 02

    [Submitted on 26 Dec 2022]

    Implications of Large- QCD for the NN Interaction

    Thomas R. Richardson🇩🇪 · Matthias R. Schindler🇺🇸 · Roxanne P. Springer🇺🇸

    We present a method for ordering two-nucleon interactions based upon their scaling with the number of QCD colors, , in the limit that becomes large. Available data in the two-nucleon sector shows general agreement with this ordering, indicating that the method may be useful in other contexts where data is less readily available. However, several caveats and potential pitfalls can make the large- ordering fragile and/or vulnerable to misinterpretation. We discuss the application of the large- analysis to two- and three-nucleon interactions, including those originating from weak and beyond-the-standard-model interactions, as well as two-nucleon external currents. Finally, we discuss some open questions in the field.

    Comments:
    23 pages, 1 figure, submitted to Ann. Rev. Nucl. Part. Sci
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2212.13049 [pdf]
    Ann.Rev.Nucl.Part.Sci.(2023)·6 citations
  3. 03

    [Submitted on 26 Dec 2022]

    Gamow shell model description of the radiative capture reaction BC

    G.X. Dong🇨🇳 · X.B. Wang🇨🇳 · N. Michel🇨🇳 · M. Płoszajczak🇫🇷

    In low metallicity supermassive stars, the hot chain can serve as an alternative way to produce the CNO nuclei. In the astrophysical environment of high temperature, the proton capture of B can be faster than its beta decay, thus BC reaction plays an important role in the hot chain. Due to the unstable nature of B and the lack of the B beam, the measurement of BC reaction can only be achieved by the indirect method, and large uncertainties exist. The Gamow shell model in the coupled-channel representation (GSM-CC) is applied to study the proton radiative capture reaction BC. For the calculation of the BC astrophysical factors, all E1, M1, and E2 transitions from the initial continuum states to the final bound states of C are considered. The resonant capture to the first resonant state of C is also calculated. The experimental low-energy levels and the proton emission threshold in C are reproduced by the GSM-CC. The calculated astrophysical factors agrees with the existed experimental data from the indirect measurements. The reaction rates from the direct capture and resonant capture are calculated for the temperature range of astrophysical interest. The calculated total astrophysical factor is dominated by the E1 transition to the ground state of C. The GSM-CC calculations suggest that first increase with the energy of the center of mass , and then decrease with the energy. This agrees with the existing data, which has smaller values at around zero energy and larger value in the energy range of 0.2 MeV 0.6 MeV.

    Comments:
    10 pages, 9 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2212.13172 [pdf]
    PRC(2023)·5 citations
  4. 04

    [Submitted on 26 Dec 2022]

    Nuclear-matter saturation and symmetry energy within --full chiral effective field theory

    W. G. Jiang🇸🇪 · C. Forssén🇸🇪 · T. Djärv🇸🇪 · G. Hagen🇺🇸

    Nuclear saturation and the symmetry energy are key properties of low-energy nuclear physics that depend on fine details of the nuclear interaction. The equation-of-state around saturation is also an important anchor for extrapolations to higher densities and studies of neutron stars. Here we develop a unified statistical framework that uses realistic nuclear forces to link the theoretical modeling of finite nuclei and infinite nuclear matter. We construct fast and accurate emulators for nuclear-matter observables and employ an iterative history-matching approach to explore and reduce the enormous parameter domain of -full chiral interactions. We perform rigorous uncertainty quantification and find that model calibration including \nuc{16}{O} observables gives saturation predictions that are more precise than those that only use few-body data.

    Comments:
    5 pages, 3 figures, updated Supplemental Material can be found in PRC version
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2212.13203 [pdf]
    PRC(2024)·22 citations
  5. 05

    [Submitted on 26 Dec 2022]

    Emulating \emph{ab initio} computations of infinite nucleonic matter

    W. G. Jiang🇸🇪 · C. Forssén🇸🇪 · T. Djärv🇸🇪 · G. Hagen🇺🇸

    We construct efficient emulators for the \emph{ab initio} computation of the infinite nuclear matter equation of state. These emulators are based on the subspace-projected coupled-cluster method for which we here develop a new algorithm called small-batch voting to eliminate spurious states that might appear when emulating quantum many-body methods based on a non-Hermitian Hamiltonian. The efficiency and accuracy of these emulators facilitate a rigorous statistical analysis within which we explore nuclear matter predictions for different parametrizations of a chiral interaction model with explicit -isobars at next-to-next-to leading order. Constrained by nucleon-nucleon scattering phase shifts and bound-state observables of light nuclei up to \nuc{4}{He}, we use history matching to identify non-implausible domains for the low-energy coupling constants of the chiral interaction. Within these domains we perform a Bayesian analysis using sampling/importance resampling with different likelihood calibrations and study correlations between interaction parameters, calibration observables in light nuclei, and nuclear matter saturation properties.

    Comments:
    16 pages, 15 figures, updated Supplemental Material can be found in the PRC version
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2212.13216 [pdf]
    PRC(2024)·35 citations

Affiliations

first authorsco-authorsvia INSPIRE