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Nuclear Theory·nucl-th

Thursday·June 1, 2023

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    [Submitted on 30 May 2023]

    Density Dependence of the Symmetry Energy in the Post PREX-CREX Era

    Brendan T. Reed · F. J. Fattoyev · C. J. Horowitz · J. Piekarewicz

    The recently published CREX results suggest a rather peculiar picture for the density dependence of the symmetry energy. Whereas PREX favors a large neutron skin thickness in Pb, thereby suggesting a stiff equation of state, CREX suggests instead a much softer equation of state. This discrepancy has caused a large spur in the theoretical community since no model has been able to simultaneously reproduce within the PREX and CREX results. Motivated by a novel correlation between a CREX observable and a combination of bulk symmetry energy parameters, we calibrate three new covariant energy density functionals that reproduce binding energies and charge radii of spherical nuclei - and also accommodate the constraints imposed by PREX and CREX. Given that these models suggest a stiff equation of state at high densities, predictions for neutron star properties are also discussed.

    Comments:
    10 pages, resubmitted to PRC
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2305.19376 [pdf]
    PRC(2024)·66 citations
  2. 02

    [Submitted on 31 May 2023]

    Uncertainties in ab initio nuclear structure calculations with chiral interactions

    P. Maris · H. Le · A. Nogga · R. Roth · J.P. Vary

    We present theoretical ground state energies and their uncertainties for p-shell nuclei obtained from chiral effective field theory internucleon interactions as a function of chiral order, fitted to two- and three-body data only. We apply a Similary Renormalization Group transformation to improve the numerical convergence of the many-body calculations, and discuss both the numerical uncertainties arising from basis truncations and those from omitted induced many-body forces, as well as chiral truncation uncertainties. With complete Next-to-Next-to-Leading (N2LO) order two- and three-body interactions, we find significant overbinding for the ground states in the upper p-shell, but using higher-order two-body potentials, in combination with N2LO three-body forces, our predictions agree with experiment throughout the p-shell to within our combined estimated uncertainties. The uncertainties due to chiral order truncation are noticeably larger than the numerical uncertainties, but they are expected to become comparable to the numerical uncertainties at complete N3LO.

    Comments:
    19 pages, 7 tables, 4 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2305.19648 [pdf]
    Front.in Phys.(2023)·12 citations
  3. 03

    [Submitted on 31 May 2023]

    Many-body correlations for nuclear physics across scales: from nuclei to quark-gluon plasmas to hadron distributions

    Giuliano Giacalone🇩🇪

    It is an experimental fact that multi-particle correlations in the final states of high-energy nucleus-nucleus collisions are sensitive to collective correlations of nucleons in the wave functions of the colliding nuclei. Here, I show that this connection is more direct than it intuitively seems. With an energy deposition scheme inspired by high-energy quantum chromodynamics, and within a linearized description of initial-state fluctuations in the quark-gluon plasma, I exhibit relations between -particle correlations in the final states of nuclear collisions and -nucleon density distributions in the colliding nuclei. This result formally justifies the sensitivity of the outcome of high-energy collisions to features such as nuclear deformations. It paves the way, thus, to systematic studies of the impact of state-of-the-art nuclear interactions in such processes.

    Comments:
    23 pages; 6 figures; ancillary files contain Monte Carlo simulator (py-Jazma.py) and data analysis code (py-Jazma_analysis.py); v2 matches the published version: fixed Eqs (37) and (41), removed discussion leading to previous Eq (57), improved description of the Monte Carlo generator in Sec. 6.1, removed previous Eq (74) from the Conclusion
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2305.19843 [pdf]
    EPJA(2023)·43 citations
  4. 04

    [Submitted on 31 May 2023]

    Transfer reactions of exotic nuclei including core deformations: Be and C

    P. Punta · J. A. Lay · A. M. Moro

    Background: Reactions with halo nuclei from deformed regions exhibit important deviations from the inert core+valence picture. Structure and reaction formalisms have recently been extended or adapted to explore the possibility of exciting the underlying core. Purpose: We will study up to what extent transfer reactions involving halo nuclei Be and C can be reproduced with two different models that have previously shown a good success reproducing the role of the core in light halo nuclei. Methods: We focus on the structure of Be and C with two core+valence models: Nilsson and a semi-microscopic particle-rotor model using Antisymmetrized Molecular Dinamic calculations of the cores. These models are later used to study C(d,p)C and Be(p,d)Be transfer reactions within the Adiabatic Distorted Wave Approximation. Results are compared with three different experimental data sets. Results: A good reproduction of both the structure and transfer reactions of Be and C is found. The Nilsson model provides an overall better agreement for the spectrum and reactions involving C while the semi-microscopic model is more adequate for Be, as expected, since the C core is closer to an ideal rotor. Conclusions: Both models show promising results for the study of transfer reactions with halo nuclei. We expect that including microscopic information in the Nilsson model, following the spirit of the semi-microscopic model, can provide a useful, yet simple framework for studying newly discovered halo nuclei.

    Comments:
    11 pages, 11 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2305.19945 [pdf]
    PRC(2023)·11 citations

Affiliations

first authorsco-authorsvia INSPIRE