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Nuclear Theory·nucl-th

Friday·November 1, 2019

12 papers—5 primary·7 cross-listed

All12Primary5Cross-lists7
  1. 01

    [Submitted on 30 Oct 2019]

    Indirect methods in nuclear astrophysics with relativistic radioactive beams

    Thomas Aumann🇩🇪 · Carlos A. Bertulani🇩🇪

    Reactions with radioactive nuclear beams at relativistic energies have opened new doors to clarify the mechanisms of stellar evolution and cataclysmic events involving stars and during the big bang epoch. Numerous nuclear reactions of astrophysical interest cannot be assessed directly in laboratory experiments. Ironically, some of the information needed to describe such reactions, at extremely low energies (e.g., keVs), can only be studied on Earth by using relativistic collisions between heavy ions at GeV energies. In this contribution, we make a short review of experiments with relativistic radioactive beams and of the theoretical methods needed to understand the physics of stars, adding to the knowledge inferred from astronomical observations. We continue by introducing a more detailed description of how the use of relativistic radioactive beams can help to solve astrophysical puzzles and several successful experimental methods. State-of-the-art theories are discussed at some length with the purpose of helping us understand the experimental results reported. The review is not complete and we have focused most of it to traditional methods aiming at the determination of the equation of state of symmetric and asymmetric nuclear matter and the role of the symmetry energy. Whenever possible, under the limitations of our present understanding of experimental data and theory, we try to pinpoint the information still missing to further understand how stars evolve, explode, and how their internal structure might be.

    Comments:
    70 pages, 66 figures, 458 references. 1 more figure and new references added
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Experiment (nucl-ex)
    arXiv:
    1910.14094 [pdf]
    PPNP(2020)·22 citations
  2. 02

    [Submitted on 30 Oct 2019]

    Prospects of Event Shape Sorting

    Boris Tomasik · Jakub Cimerman

    Event Shape Sorting is a novel method which is devised to organise a sample of collision events in such a way, that events with similar final state distribution of hadrons end up sorted close to each other. Such events are likely to have evolved similarly. Thus the method allows to focus at finer features of the collision evolution because it would allow for averages over similar events that do not wash away these features. The algorithm is shortly explained. We also point out the distinction of Event Shape Sorting from the well established technique of Event Shape Engineering.

    Comments:
    Proceedings of WPCF 2019, June 3-7, Dubna, Russia. We put colored version of the figures on the arxiv (only BW in the printed proceedings)
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1910.14183 [pdf]
    Phys.Part.Nucl.(2020)·0 citations
  3. 03

    [Submitted on 31 Oct 2019]

    Muonic Lithium atoms: nuclear structure corrections to the Lamb shift

    S. Li Muli🇩🇪 · A. Poggialini🇮🇹 · S. Bacca🇩🇪

    In view of the future plans to measure the Lamb shift in muonic Lithium atoms we address the microscopic theory of the -Li and -Li systems. The goal of the CREMA collaboration is to measure the Lamb shift to extract the charge radius with high precision and compare it to electron scattering data or atomic spectroscopy to see if interesting puzzles, such as the proton and deuteron radius puzzles, arise. For this experiment to be successful, theoretical information on the nuclear structure corrections to the Lamb shift is needed. For -Li and -Li there exist only estimates of nuclear structure corrections based on experimental data that suffer from very large uncertainties. We present the first steps towards an ab initio computation of these quantities using few-body techniques.

    Comments:
    Submission to SciPost, 10 pages, 4 figure, Proceedins of the 24th European conference on few-body problems in physics (EFB24) at the University of Surrey, Guildford, United Kingdom, from 2 to 6 September 2019
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1910.14370 [pdf]
    SciPost Phys.Proc.(2020)·9 citations
  4. 04

    [Submitted on 31 Oct 2019]

    Rapidity-dependent eccentricity scaling in relativistic heavy-ion collisions

    Rodrigo Franco🇧🇷 · Matthew Luzum🇧🇷

    There is a well-established relation between the spatial asymmetry in the initial stage of a heavy-ion collision and the final momentum anisotropy, which allows for a separation of effects from initial conditions vs. later evolution and has proved exceptionally powerful. However, until recently it has only been studied in two dimensions -- either through boost-invariant simulations or studying only quantities at mid-rapidity. We explore an extension to 3 dimensions, in order to determine whether a similar understanding can be obtained for the rapidity dependence of the collision system. In particular, we introduce rapidity-dependent eccentricities and investigate a trivial extension of the 2D eccentricity scaling of elliptic and triangular flow, as well as a way to systematically improve these initial-state estimators. We then explore the dependence of the resulting response coefficients on shear viscosity and initial total energy.

    Comments:
    7 pages, 10 figures; v2: addition of Appendix B with discussion about another possible term in gradient expansion of eccentricities, version accepted for publication
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1910.14598 [pdf]
    PLB(2020)·12 citations
  5. 05

    [Submitted on 31 Oct 2019]

    Searching for three-nucleon short-range correlations

    Misak M. Sargsian🇺🇸 · Donal B. Day🇺🇸 · Leonid L. Frankfurt🇮🇱 · Mark I. Strikman🇺🇸

    Three nucleon short range correlations~(SRCs) are one of the most elusive structures in nuclei. Their observation and the subsequent study of their internal makeup will have a significant impact on our understanding of the dynamics of super-dense nuclear matter which exists at the cores of neutron stars. We discuss the kinematic conditions and observables that are most favorable for probing 3N-SRCs in inclusive electro-nuclear processes and make a prediction for a quadratic dependence of the probabilities of finding a nucleon in 2N- and 3N- SRCs. We demonstrate that this prediction is consistent with the limited high energy experimental data available, suggesting that we have observed, for the first time, 3N-SRCs in electro-nuclear processes. Our analysis enables us to extract , the probability of finding 3N-SRCs in nuclei relative to the A=3 system.

    Comments:
    7 pages and 4 figures, to be published in Physical Review C
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1910.14663 [pdf]
    PRC(2019)·16 citations

Affiliations

first authorsco-authorsvia INSPIRE