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Nuclear Theory·nucl-th

Wednesday·December 28, 2016

10 papers—6 primary·4 cross-listed

All10Primary6Cross-lists4
  1. 01

    [Submitted on 24 Dec 2016]

    The deuteron wave function and neutron form factors from the elastic electron deuteron scattering

    N.A. Khokhlov

    A study of the deuteron structure in the framework of relativistic quantum mechanics is presented. Point-form (PF) relativistic quantum mechanics (RQM) is applied to the elastic eD scattering. The deuteron wave function and neutron form factors are fitted to the electromagnetic deuteron form factors. We also compare results obtained by different realistic deuteron wave functions stemming from Nijmegen-I, Nijmegen-II, JISP16, CD-Bonn, Paris, Argonne, Idaho and Moscow (with forbidden states) potentials. It is shown that the electromagnetic deuteron form factors may be described without exchange currents.

    Comments:
    17 pages, 6 figures, International conference Nuclear Theory in the super computer era 2016, NTSE 2016, Khabarovsk, Russia, September 19 23, 2016. arXiv admin note: text overlap with arXiv:1503.02770
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1612.08172 [pdf]
    2 citations
  2. 02

    [Submitted on 26 Dec 2016]

    In-Medium Similarity Renormalization Group Approach to the Nuclear Many-Body Problem

    H. Hergert🇺🇸 · S. K. Bogner🇺🇸 · J. G. Lietz🇺🇸 · T. D. Morris🇺🇸 · S. J. Novario🇺🇸 · N. M. Parzuchowski🇺🇸 · F. Yuan🇺🇸

    We present a pedagogical discussion of Similarity Renormalization Group (SRG) methods, in particular the In-Medium SRG (IMSRG) approach for solving the nuclear many-body problem. These methods use continuous unitary transformations to evolve the nuclear Hamiltonian to a desired shape. The IMSRG, in particular, is used to decouple the ground state from all excitations and solve the many-body Schrödinger equation. We discuss the IMSRG formalism as well as its numerical implementation, and use the method to study the pairing model and infinite neutron matter. We compare our results with those of Coupled cluster theory, Configuration-Interaction Monte Carlo, and the Self-Consistent Green's Function approach. The chapter concludes with an expanded overview of current research directions, and a look ahead at upcoming developments.

    Comments:
    73 pages, to appear in Lecture Notes in Physics (Springer), "An advanced course in computational nuclear physics: Bridging the scales from quarks to neutron stars", edited by M. Hjorth-Jensen, M. P. Lombardo, and U. van Kolck
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1612.08315 [pdf]
    Lect.Notes Phys.(2017)·27 citations
  3. 03

    [Submitted on 27 Dec 2016]

    Leading order relativistic hyperon-nucleon interactions in chiral effective field theory

    Kai-Wen Li🇨🇳 · Xiu-Lei Ren🇨🇳 · Li-Sheng Geng🇨🇳 · Bing-Wei Long🇨🇳

    We apply a recently proposed covariant power counting in nucleon-nucleon interactions to study strangeness interactions in chiral effective field theory. At leading order, Lorentz invariance introduces 12 low energy constants, in contrast to the heavy baryon approach, where only five appear. The Kadyshevsky equation is adopted to resum the potential in order to account for the non-perturbative nature of hyperon-nucleon interactions. A fit to the hyperon-nucleon scattering data points yields , which is comparable with the sophisticated phenomenological models and the next-to-leading order heavy baryon approach. However, one cannot achieve a simultaneous description of the nucleon-nucleon phase shifts and strangeness hyperon-nucleon scattering data at leading order.

    Comments:
    14 pages, 8 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1612.08482 [pdf]
    CPC(2018)·59 citations
  4. 04

    [Submitted on 27 Dec 2016]

    Collective Excitations in Hot QCD Plasma

    Navid Abbasi🇮🇷 · Davood Allahbakhshi🇮🇷 · Ali Davody🇩🇪 · Seyed Farid Taghavi🇮🇷

    We study the long wavelength excitations in rotating QCD fluid in presence of an external magnetic field at finite vector and axial charge densities. We consider the fluctuations of vector and axial charge currents coupled to energy and momentum fluctuations and compute the covariant dispersion relations of the six corresponding hydrodynamic modes. Among them, there are always two scalar Chiral Magnetic-Vortical-Heat (CMVH) waves; In the absence of magnetic field (vorticity) these waves reduce to CVH (CMH) waves. While CMVH waves are the mixed of CMH and CVH waves, they have generally different velocities compared to the sum of velocities of the latter waves. The other four modes, which are made out of scalar-vector fluctuations, are mixed Sound-Alfvén waves. We show that in the direction parallel to both magnetic field and vorticity, these four modes are the two ordinary sound modes together with two Chiral Alfvén waves (CAW).

    Comments:
    34 pages, 3 figures, 4 tables, v2: one table removed, anomalous transport coefficients corrected, a subsection on Chiral Heat Wave added, references added, v3: PRD version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
    arXiv:
    1612.08614 [pdf]
    PRD(2017)·13 citations
  5. 05

    [Submitted on 27 Dec 2016]

    Refined Glauber model versus Faddeev calculations and experimental data for spin observables

    M. N. Platonova🇷🇺 · V. I. Kukulin🇷🇺

    Spin-dependent observables in intermediate-energy elastic scattering within the framework of the refined Glauber model are considered. The improvements include an account of all ten and helicity amplitudes at respective energies constructed on the basis of modern phase-shift analysis, accurate deuteron wave functions taken from the modern force model and account of charge-exchange effects. Predictions of the refined diffraction model for the differential cross section and analyzing powers are compared with exact three-body Faddeev calculations and the recent experimental data. An amazingly good agreement between the results of both theoretical approaches as well as between the refined Glauber model and experiment in a wide angular range not only for differential cross section but also for vector and tensor analyzing powers has been found in the first time. Possible reasons for this agreement are discussed.

    Comments:
    This submission corresponds to the preprint version of the previuosly published paper [Phys. Rev. C 81, 014004 (2010)]. Misprints found in formulas of the original paper have been corrected [see Erratum recently published in Phys. Rev. C 94, 069902 (2016)]
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1612.08694 [pdf]
    PRC(2010)·51 citations
  6. 06

    [Submitted on 27 Dec 2016]

    Energy Dependent Separable Optical Potentials for (d,p) Reactions

    L. Hlophe · Ch. Elster

    An important ingredient for applications of nuclear physics to e.g. astrophysics or nuclear energy are the cross sections for reactions of neutrons with rare isotopes. Since direct measurements are often not possible, indirect methods like reactions must be used instead. Those reactions may be viewed as effective three-body reactions and described with Faddeev techniques. An additional challenge posed by reactions involving heavier nuclei is the treatment of the Coulomb force. To avoid numerical complications in dealing with the screening of the Coulomb force, recently a new approach using the Coulomb distorted basis in momentum space was suggested. In order to implement this suggestion separable representations of neutron- and proton-nucleus optical potentials, which are not only complex but also energy dependent, need to be introduced. Including excitations of the nucleus in the calculation requires a multichannel optical potential, and thus separable representations thereof.

    Comments:
    14 pages, 6 figures, submitted to the Proceedings of the International Conference `Nuclear Theory in the Supercomputing Era - 2016' (NTSE-2016), Khabarovsk, Russia, Sept. 19-23, 2016
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1612.08710 [pdf]
    0 citations

Affiliations

first authorsco-authorsvia INSPIRE