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Nuclear Theory·nucl-th

Monday·October 15, 2018

6 papers—5 primary·1 cross-listed

All6Primary5Cross-lists1
  1. 01

    [Submitted on 11 Oct 2018]

    The role of the Heisenberg principle in Constrained Molecular Dynamics model

    K. Wang · A. Bonasera · H. Zheng · G. Q. Zhang · Y. G. Ma · W. Q. Shen

    We implement the Heisenberg principle into the Constrained Molecular Dynamics (CoMD) model with a similar approach to the Pauli principle using the one-body occupation probability . Results of the modified and the original model with comparisons to data are given. The binding energies and the radii of light nuclei obtained with the modified model are more consistent to the experimental data than the original one. The collision term and the density distribution are tested through a comparison to p+C elastic scattering data. Some simulations for fragmentation and superheavy nuclei production are also discussed.

    Comments:
    6pages, 10 figures, submitted to PRC
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1810.05180 [pdf]
    IJMPE(2019)·1 citation
  2. 02

    [Submitted on 11 Oct 2018]

    Ernest Henley's Isospin and the Ensuing Progress

    Gerald A. Miller🇺🇸

    Ernest Henley's contributions to understanding isospin symmetry and the experimental and theoretical progress that followed are reviewed. Many experimentalists and theorists worked to bring Ernest's early vision of the subject to fruition. This progress and wide-ranging impact is described.

    Comments:
    Chapter in IJPME volume celebrating the contributions of Prof. Ernest M. Henley
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1810.05239 [pdf]
    IJMPE(2018)·0 citations
  3. 03

    [Submitted on 12 Oct 2018]

    Kinetic approach to polarization-vorticity coupling and hydrodynamics with spin

    Avdhesh Kumar

    Recently introduced equilibrium Wigner functions for spin-one-half particles are used in the semiclassical kinetic equations to study the relation between spin polarization and vorticity. It is found, in particular, that such a framework does not necessarily imply that the thermal-vorticity and spin polarization tensors are equal. Subsequently, a procedure to formulate the hydrodynamic framework for particles with spin-one-half, based on the semiclassical expansion, is outlined.

    Comments:
    6 pages, WPCF 2018 proceeding
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1810.05364 [pdf]
    Acta Phys. Pol. B Proc. Suppl. 12, 393 (2…·4 citations
  4. 04

    [Submitted on 11 Oct 2018]

    Supplemental note for "Two-fermion emission from spin-singlet and triplet resonances in one dimension"

    Tomohiro Oishi🇭🇷

    Time-dependent calculation has been a suitable method to investigate the quantum dynamical processes. In Ref. [1] = [T. Oishi et al., J. of Phys. G 45, 105101 (2018)], we applied this method to the one-dimensional two-fermion tunneling in the nuclear-physics scale. Beside the specific results presented therein, some basic formalism and methods, which can be helpful for further discussions and developments to investigate time-dependent quantum systems, have been awaiting our description. This note is devoted to describe those supplemental contents. We do not limit the story to the nuclear physics, but keep it applicable to other scales and/or targets.

    Comments:
    5 pages
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1810.05521 [pdf]
    0 citations
  5. 05

    [Submitted on 12 Oct 2018]

    An introduction to Bootstrap for nuclear physics

    A. Pastore

    This guide aims at providing a general introduction to bootstrap methods. By using simple examples taken from nuclear physics, I discuss how such a method can be used to quantify error bars of an estimator. I also investigate the use of bootstrap to estimate parameters of a simple liquid drop model. In particular, I investigate how the method compares with standard techniques based on likelihood estimator and how to take into account correlations to better evaluate confidence interval of parameters.

    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1810.05585 [pdf]
    J.Phys.G(2019)·23 citations
  6. 06

    [Submitted on 12 Oct 2018] (cross-list from nucl-ex)

    Direct Observation of Proton-Neutron Short-Range Correlation Dominance in Heavy Nuclei

    M. Duer · A. Schmidt · J.R. Pybus · E.P. Segarra · A.W. Denniston · R. Weiss · O. Hen · E. Piasetzky · L.B. Weinstein · N. Barnea · I. Korover · E. O. Cohen · H. Hakobyan · the CLAS Collaboration

    We measured the triple coincidence A(e,e'np) and A(e,e'pp) reactions on carbon, aluminum, iron, and lead targets at Q2 > 1.5 (GeV/c)2, xB > 1.1 and missing momentum > 400 MeV/c. This was the first direct measurement of both proton-proton (pp) and neutron-proton (np) short-range correlated (SRC) pair knockout from heavy asymmetric nuclei. For all measured nuclei, the average proton-proton (pp) to neutron-proton (np) reduced cross-section ratio is about 6%, in agreement with previous indirect measurements. Correcting for Single-Charge Exchange effects decreased the SRC pairs ratio to ~ 3%, which is lower than previous results. Comparisons to theoretical Generalized Contact Formalism (GCF) cross-section calculations show good agreement using both phenomenological and chiral nucleon-nucleon potentials, favoring a lower pp to np pair ratio. The ability of the GCF calculation to describe the experimental data using either phenomenological or chiral potentials suggests possible reduction of scale- and scheme-dependence in cross section ratios. Our results also support the high-resolution description of high-momentum states being predominantly due to nucleons in SRC pairs.

    Comments:
    Accepted for publication in PRL. 9 pages, 3 figures, 3 tables and supplementary materials
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1810.05343 [pdf]
    PRL(2019)·135 citations

Affiliations

first authorsco-authorsvia INSPIRE