PaperPanorama
FAQ

Nuclear Theory·nucl-th

Friday·July 9, 2021

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 01

    [Submitted on 8 Jul 2021]

    Parton evolution time dependent transverse shape asymmetry in peripheral Pb-Pb and p-Pb collisions at 5.02 TeV

    De-Xian Wei🇨🇳

    In this paper, we use a multi-phase transport model to simulate the parton evolution time-dependent transverse asymmetry in peripheral Pb-Pb (b=14-15 fm) and p-Pb (b=0-1 fm) collisions at = 5.02 TeV, respectively. The simulated results showed that the initial spatial asymmetry depends on the collision system, while both the initial momentum asymmetry and final momentum asymmetry are independent on the collision system. It is also shown that the final momentum asymmetry is similar to the initial momentum asymmetry. Furthermore, the averaged transverse shape asymmetry, which includes the initial spatial asymmetry, the initial momentum asymmetry, and the final momentum asymmetry, is significantly dependent on the transverse momentum and particle species identity (PID). The PID scales ordering transverse asymmetry indicated that it provides a possible observation for studying the fluctuating droplet properties of quark-gluon plasma, which may produce in heavy-ion collisions.

    Comments:
    8 pages, 6 figures, this version is accepted by IJMPE;
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2107.03546 [pdf]
    IJMPE(2021)·1 citation
  2. 02

    [Submitted on 8 Jul 2021]

    What hath Weinberg wrought? Reflections on what Weinberg's papers on 'Nuclear Forces from Chiral Lagrangians' did and did not accomplish

    Daniel R. Phillips🇺🇸

    I discuss selected legacies of Weinberg's application of chiral Lagrangians to nuclear physics: (1) the use of the chiral expansion to organize the interaction of pions and photons with a nucleus; (2) the much-debated question of why and how the potential derived from a chiral Lagrangian should be inserted in the Schrodinger equation; (3) the emergence of "pionless EFT" as a tool for diagnosing universal correlations that are present in quantum few-body systems of very different sizes, and, perhaps most important of all, (4) an epistemological shift in what is expected of a nuclear-physics calculation.

    Comments:
    20 pages, 3 figures. Contribution to Special Issue of Few-Body Systems: Celebrating 30 years of Steven Weinberg's papers on Nuclear Forces from Chiral Lagrangians. v2: Contains updated discussion of M_N scaling and corrects statements in v1 about Weinberg's choice of regularization and subtraction scheme. v3: Version accepted for publication. Includes additional references to recent work
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2107.03558 [pdf]
    Few Body Syst.(2022)·9 citations
  3. 03

    [Submitted on 8 Jul 2021]

    hyper-nuclear states predicted by NLO chiral baryon-baryon interactions

    M. Kohno🇯🇵 · K. Miyagawa🇯🇵

    The single-particle potential obtained in nuclear matter with the next-to-leading order baryon-baryon interactions in chiral effective field theory is applied to finite nuclei by an improved local-density approximation method. As a premise, phase shifts of elastic scattering and the results of Faddeev calculations for the bound state problem are presented to show the properties of the interactions in the present parametrization. First, the states in N are revisited because of the recent experimental progress, including the discussion on the spin-orbit interaction that is relevant to the location of the -state. Then the levels in Fe are calculated. In particular, the level shift which is expected to be measured experimentally in the near future is predicted. The smallness of the imaginary part of the single-particle potential is explicitly demonstrated.

    Comments:
    7 pages, 7 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2107.03784 [pdf]
    2 citations
  4. 04

    [Submitted on 8 Jul 2021]

    Proton number fluctuations in partial chemical equilibrium

    Boris Tomasik🇸🇰 · Paula Hillmann🇩🇪 · Marcus Bleicher🇩🇪

    We calculate volume-independent ratios of cumulants of the net-proton number distribution up to sixth order in a fireball that cools down after the chemical freeze-out. A hadron resonance gas model is used together with the assumption of partial chemical equilibrium, which fixes the number of observed stable hadrons after the chemical freeze-out. It is shown that due to only weak departure from the statistical Boltzmann distribution, also the volume-independent ratios of higher-order cumulants of the net-proton number show only weak dependence on the temperature. This observation supports the possibility to measure non-critical cumulants at chemical freeze-out even after subsequent cooling in the hadronic phase. Cumulants of the net-baryon number behave similarly, while those for the kaon number vary more strongly with the temperature. Our results are relevant for the current fluctuation studies of the RHIC-BES runs.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2107.03830 [pdf]
    PRC(2021)·6 citations
  5. 05

    [Submitted on 8 Jul 2021]

    Structure Calculations Without Effective Interactions

    J. A. Secrest · J. M. Conroy · H. G. Miller

    Good approximate eigenstates of a Hamiltionian operator which poesses a point as well as a continuous spectrum have beeen obtained using the Lanczos algorithm. Iterating with the bare Hamiltonian operator yields spurious solutions which can easily be identified. The rms radius of the ground state eigenvector, for example, is calculated using the bare operator.

    Comments:
    arXiv admin note: text overlap with arXiv:0711.3529
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2107.03921 [pdf]
    0 citations

Affiliations

first authorsco-authorsvia INSPIRE