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Nuclear Theory·nucl-th

Friday·December 13, 2019

17 papers—7 primary·10 cross-listed

All17Primary7Cross-lists10
  1. 01

    [Submitted on 11 Dec 2019]

    Multi-gluon correlations and evidence of saturation from dijet measurements at an Electron Ion Collider

    Heikki Mäntysaari🇫🇮 · Niklas Mueller🇺🇸 · Farid Salazar🇺🇸 · Björn Schenke🇺🇸

    We study inclusive and diffractive dijet production in electron-proton and electron-nucleus collisions within the Color Glass Condensate effective field theory. We compute dijet cross sections differentially in both mean dijet transverse momentum and recoil momentum , as well as the anisotropy in the relative angle between and . We use the nonlinear Gaussian approximation to compute multiparticle correlators for general small kinematics, employing running coupling Balitsky-Kovchegov evolution to determine the dipole amplitude at small . Our results cover a much larger kinematic range than accessible in previous computations performed in the correlation limit approximation, where it is assumed that . We validate this approximation in its range of applicability and quantify its failure for . We also predict significant target-dependent deviations from the correlation limit approximation for and , which offers a straightforward test of gluon saturation and access to multi-gluon distributions at a future electron ion collider.

    Comments:
    9 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1912.05586 [pdf]
    PRL(2020)·79 citations
  2. 02

    [Submitted on 11 Dec 2019]

    Variational and parquet-diagram calculations for neutron matter. I. Structure and Energetics

    E.Krotscheck · J. Wang

    We develop the variational/parquet diagram approach to the structure of nuclear systems with strongly state-dependent interactions. For that purpose, we combine ideas of the general Jastrow-Feenberg variational method and the local parquet-diagram theory for bosons with state-dependent interactions (R. A. Smith and A. D. Jackson, Nucl. Phys. {\bf 476}, 448 (1988)). The most tedious aspect of variational approaches, namely the symmetrization of an operator dependent variational wave function, is thereby avoided. We carry out calculations for neutron matter interacting via the Reid and Argonne models of the nucleon-nucleon interaction. While the equation of state is a rather robust quantity that comes out reasonably well even in very simplistic approaches, we show that effective interactions, which are the essential input for calculating dynamic properties, depend sensitively on the quality of the treatment of the many-body problem.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1912.05685 [pdf]
    PRC(2020)·8 citations
  3. 03

    [Submitted on 12 Dec 2019]

    Properties of exotic nuclei and their linkage to the nucleonic interaction

    H. Nakada

    The structure of exotic nuclei sheds new light on the linkage of the nuclear structure to the nucleonic interaction. The self-consistent mean-field (SCMF) theories are useful to investigate this linkage, which are applicable to many nuclei covering almost the whole range of the nuclear chart without artificial truncation of model space. For this purpose, it is desired to develop effective interaction for the SCMF calculations well connected to the bare nucleonic interaction. Focusing on ground-state properties, I show results of the SCMF calculations primarily with the M3Y-type semi-realistic interaction, M3Y-P6 and M3Y-P6a to be precise, and discuss in detail how the nucleonic interaction affects structure of nuclei including those far off the -stability.

    Comments:
    To be published in IJMPE (as a review article)
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1912.05756 [pdf]
    IJMPE(2020)·22 citations
  4. 04

    [Submitted on 12 Dec 2019]

    Issues with Search for Critical Point in QCD with Relativistic Heavy Ion Collisions

    Masayuki Asakawa🇯🇵 · Masakiyo Kitazawa🇯🇵 · Berndt Müller🇺🇸

    A systematic search for a critical point in the phase diagram of QCD matter is underway at the Relativistic Heavy Ion Collider (RHIC) and is planned at several future facilities. Its existence, if confirmed, and its location will greatly enhance our understanding of QCD. In this note we emphasize several important issues that are often not fully recognized in theoretical interpretations of experimental results relevant to the critical point search. We discuss ways in which our understanding on these issues can be improved.

    Comments:
    The title has been changed. One reference has been added. Physical Review C in press
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1912.05840 [pdf]
    PRC(2020)·18 citations
  5. 05

    [Submitted on 12 Dec 2019]

    Rate for Laser-Induced Nuclear Dipole Absorption

    Adriana Pálffy🇩🇪 · Paul-Gerhard Reinhard🇩🇪 · Hans A. Weidenmüller🇩🇪

    Using the Brink-Axel hypothesis we derive the rate for nuclear dipole excitation by a laser pulse carrying photons with average energy MeV. As expected . The rate is also proportional to the aperure of the laser pulse. Perhaps less expected is the fact that , irrespective of the degree of coherence of the laser pulse. The expression for , derived for a nearly stationary laser pulse, is valid also for short times and can, thus, be used in simulations via rate equations of multiple nuclear dipole excitations by a single pulse. The explicit dependence of on the parameters of the laser pulse and on nuclear parameters given in the paper should help to optimize experiments on laser-nucleus reactions.

    Comments:
    12 pages, v2 slightly modified to match the published version
    Subjects:
    Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    1912.05991 [pdf]
    PRC(2020)·2 citations
  6. 06

    [Submitted on 12 Dec 2019]

    Implementing chiral three-body forces in terms of medium-dependent two-body forces

    Jeremy W. Holt · Mamiya Kawaguchi · Norbert Kaiser

    Three-nucleon (3N) forces are an indispensable ingredient for accurate few-body and many-body nuclear structure and reaction theory calculations. While the direct implementation of chiral 3N forces can be technically very challenging, a simpler approach is given by employing instead a medium-dependent NN interaction V_med that reflects the physics of three-body forces at the two-body normal-ordered approximation. We review the derivation and construction of V_med from the chiral 3N interaction at next-to-next-to-leading order (N2LO), consisting of a long-range -exchange term, a mid-range -exchange component and a short-range contact term. Several applications of V_med to the equation of state of cold nuclear and neutron matter, the nucleon single-particle potential in nuclear matter, and the nuclear quasiparticle interaction are discussed. We also explore differences in using local vs. nonlocal regulating functions on 3N forces and make direct comparisons to exact results at low order in perturbation theory expansions for the equation of state and single-particle potential. We end with a discussion and numerical calculation of the in-medium NN potential V_med from the next-to-next-to-next-to-leading order (N3LO) chiral 3N force, which consists of a series of long-range and short-range terms.

    Comments:
    31 pages, 15 figures, Published in Frontiers in Physics special volume "The Long-Lasting Quest for Nuclear Interactions: The Past, the Present and the Future"
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1912.06055 [pdf]
    Front.in Phys.(2020)·25 citations
  7. 07

    [Submitted on 12 Dec 2019]

    Ab initio rotation in 10Be

    M. A. Caprio · P. J. Fasano · A. E. McCoy · P. Maris · J. P. Vary

    Ab initio theory describes nuclei from a fully microscopic formulation, with no presupposition of collective degrees of freedom, yet signatures of clustering and rotation nonetheless arise. We can therefore look to ab initio theory for an understanding of the nature of these emergent phenomena. To probe the nature of rotation in 10Be, we examine the predicted rotational spectroscopy from no-core configuration interaction (NCCI) calculations with the Daejeon16 internucleon interaction, and find spectra suggestive of coexisting rotational structures having qualitatively different intrinsic deformations: one triaxial and the other with large axial deformation arising primarily from the neutrons.

    Comments:
    11 pages, 4 figures; contribution to the proceedings of the Third International Workshop "Shapes and Dynamics of Atomic Nuclei: Contemporary Aspects" (SDANCA-19), Sofia, Bulgaria, October 2019, to be published in Bulg. J. Phys
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1912.06082 [pdf]
    Bulg.J.Phys.(2019)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE