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Nuclear Theory·nucl-th

Tuesday·November 22, 2016

21 papers—7 primary·14 cross-listed

All21Primary7Cross-lists14
  1. 01

    [Submitted on 21 Nov 2016]

    Influence of Nambu-Goldstone mode on energy-weighted sum of excitation strengths in random-phase approximation

    H. Nakada

    Influence of the Nambu-Goldstone (NG) mode on the energy-weighted sum (EWS) of the excitation strengths is analyzed, within the random-phase approximation (RPA). When a certain symmetry is broken at the mean-field level, a NG mode emerges in the RPA, which can be represented by canonical variables forming a two-dimensional Jordan block. A general formula is rederived which separates out the NG-mode contribution to the EWS, via the projection on the subspace directed by the NG mode. As examples, the formula is applied to the excitation and the rotational excitations in nuclei, further confirming theoretical consistency of the RPA.

    Comments:
    13 pages, to be published in PTEP
    Subjects:
    Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    1611.06623 [pdf]
    PTEP(2017)·3 citations
  2. 02

    [Submitted on 21 Nov 2016]

    The extraction of parameters from final state interactions

    G.Faldt🇸🇪 · C.Wilkin🇬🇧

    It is argued that final state enhancements in production reactions at large momentum transfers, such as pp -> K^+ Lambda p, are primarily sensitive to the position of a virtual bound state pole in the Lambda p system rather than the Lambda p scattering length and effective range. These arguments are supported by a study of the dispersion relation derived to describe such processes as a function of the cut-off energy. This shows that the position of the virtual bound state is independent of the cut-off energy.

    Comments:
    6 pages + 3 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1611.06716 [pdf]
    PRC(2017)·3 citations
  3. 03

    [Submitted on 21 Nov 2016]

    Computational Nuclear Physics and Post Hartree-Fock Methods

    Justin Lietz (MSU)🇺🇸 · Sam Novario (MSU)🇺🇸 · Gustav R. Jansen (ORNL)🇺🇸 · Gaute Hagen (ORNL)🇺🇸 · Morten Hjorth-Jensen (MSU and University of Oslo)🇺🇸

    We present a computational approach to infinite nuclear matter employing Hartree-Fock theory, many-body perturbation theory and coupled cluster theory. These lectures are closely linked with those of chapters 9, 10 and 11 and serve as input for the correlation functions employed in Monte Carlo calculations in chapter 9, the in-medium similarity renormalization group theory of dense fermionic systems of chapter 10 and the Green's function approach in chapter 11. We provide extensive code examples and benchmark calculations, allowing thereby an eventual reader to start writing her/his own codes. We start with an object-oriented serial code and end with discussions on strategies for porting the code to present and planned high-performance computing facilities.

    Comments:
    82 pages, to appear in Lecture Notes in Physics (Springer), "An advanced course in computational nuclear physics: Bridging the scales from quarks to neutron stars", M. Hjorth-Jensen, M. P. Lombardo, U. van Kolck, Editors
    Subjects:
    Nuclear Theory (nucl-th); Strongly Correlated Electrons (cond-mat.str-el); Nuclear Experiment (nucl-ex)
    arXiv:
    1611.06765 [pdf]
    Lect.Notes Phys.(2017)·8 citations
  4. 04

    [Submitted on 21 Nov 2016]

    Phase transition in the SRG flow of nuclear interactions

    Varese S. Timoteo🇧🇷 · Enrique R. Arriola🇪🇸 · S. Szpigel🇧🇷

    We use a chiral interaction at N3LO in the 1S0 channel of the nucleon- nucleon interaction in order to investigate the on-shell transition along the similarity renormalization group flow towards the infrared limit. We find a crossover at a scale that depends on the number of grid points used to discretise the momentum space.

    Comments:
    Talk given at EFB23, Aarhus, August 2016
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1611.06799 [pdf]
    Few Body Syst.(2017)·3 citations
  5. 05

    [Submitted on 21 Nov 2016]

    Laser-Matter Interaction: Classical Regime versus Quantum Regime

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

    Doppler backscattering of optical laser photons on a "flying mirror" of relativistic electrons promises to yield coherent photons with MeV-range energies. We compare the nuclear interaction of such a laser pulse with the standard atom-laser interaction. The mean-field description of atoms must be replaced by a rate equation and the classical field strength, far too faint in nuclei, by the dipole transition rate. Significant nuclear excitation occurs for photon numbers much smaller than typical for atoms. That drastically reduces the requirements on the experimental realization of a "flying mirror".

    Comments:
    5 pages, one figure
    Subjects:
    Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph)
    arXiv:
    1611.06811 [pdf]
    0 citations
  6. 06

    [Submitted on 18 Nov 2016]

    Validity of Chemical Equilibrium Approach in the Study of Kinetic Freeze-out in p-Pb Collisions at LHC

    Inam-ul Bashir🇮🇳 · Hamid Nanda🇮🇳 · Saeed Uddin🇮🇳

    Transverse momentum spectra of identified pions, Kaons , protons and Lambdas produced at mid-rapidity (0 < ycm < 0.5) in p-Pb collisions at root(sNN) = 5.02 TeV is studied for different collision centralities by using a Unified Statistical Thermal Freeze-out Model (USTFM). A fairly good agreement is seen between the calculated results and the experimental data points taken from the ALICE experiment. Kinetic freeze-out conditions are extracted from the fits of the transverse momentum spectra of these hadrons for each centrality class. A comparison of the obtained freeze-out parameters with those of heavy-ion collisions (Pb + Pb) is made and discussed.

    Comments:
    Authors and Collaborators have a different opinions about the publications of a paper. We want to withdraw it from the arXiv till further discussions
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1611.06876 [pdf]
    0 citations
  7. 07

    [Submitted on 21 Nov 2016]

    Ground-state properties of even and odd Magnesium isotopes in a symmetry-conserving approach

    Marta Borrajo · J. Luis Egido

    We present a self-consistent theory for odd nuclei with exact blocking and particle number and angular momentum projection. The demanding treatment of the pairing correlations in a variation-after-projection approach as well as the explicit consideration of the triaxial deformation parameters in a projection after variation method, together with the use of the finite-range density-dependent Gogny force, provides an excellent tool for the description of odd-even and even-even nuclei. We apply the theory to the Magnesium isotopic chain and obtain an outstanding description of the ground-state properties, in particular binding energies, odd-even mass differences, mass radii and electromagnetic moments among others.

    Comments:
    8 pages, 6 figures, accepted for publication in Phys. Let. B
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1611.06982 [pdf]
    PLB(2017)·28 citations

Affiliations

first authorsco-authorsvia INSPIRE