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Nuclear Theory·nucl-th

Monday·November 6, 2017

6 papers—4 primary·2 cross-listed

All6Primary4Cross-lists2
  1. 01

    [Submitted on 3 Nov 2017]

    Evaluation of the hyperon binding energy via statistical production of hypernuclei

    A.S. Botvina · M. Bleicher · N. Buyukcizmeci

    In nuclear reactions of high energy one can simultaneously produce a lot of hypernuclei after the capture of hyperons by nuclear residues. We consider statistical disintegration of such hypernuclear systems and the connection of fragment production with the binding energies of hyperons. It is demonstrated that the hyperon binding energies can be effectively evaluated from the yields of different isotopes of hypernuclei. The double ratio method is suggested for this purpose. The advantage of this procedure is its universality and the possibility to involve many different isotopes. This method can also be applied for multi-strange nuclei, which binding energies were very difficult to measure in previous hypernuclear experiments.

    Comments:
    10 pages, submitted to Jour. Phys. G:Nuclear and Particle Physics
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1711.01159 [pdf]
    PRC(2018)·16 citations
  2. 02

    [Submitted on 3 Nov 2017]

    Bootstrap technique to study correlation between neutron skin thickness and the slope of symmetry energy in atomic nuclei

    D. Muir · A. Pastore · J. Dobaczewski · C. Barton

    We present a new statistical tool based on random sampling to assess the confidence interval of Pearson's and Spearman's correlation coefficients. These estimators are then used to quantify the statistical correlations among the neutron skin thickness of atomic nuclei and the slope of the symmetry energy in the infinite nuclear medium.

    Comments:
    Presented at the XXXV Mazurian Lakes Conference on Physics, Piaski, Poland, September 3-9, 2017
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1711.01190 [pdf]
    Acta Phys.Polon.B(2018)·3 citations
  3. 03

    [Submitted on 3 Nov 2017]

    The deuteron-radius puzzle is alive: A new analysis of nuclear structure uncertainties

    Oscar Javier Hernandez🇩🇪 · Andreas Ekström🇸🇪 · Nir Nevo Dinur🇨🇦 · Chen Ji🇨🇳 · Sonia Bacca🇩🇪 · Nir Barnea🇮🇱

    To shed light on the deuteron radius puzzle we analyze the theoretical uncertainties of the nuclear structure corrections to the Lamb shift in muonic deuterium. We find that the discrepancy between the calculated two-photon exchange correction and the corresponding experimentally inferred value by Pohl et al. [1] remain. The present result is consistent with our previous estimate, although the discrepancy is reduced from 2.6 to 2 . The error analysis includes statistic as well as systematic uncertainties stemming from the use of nucleon-nucleon interactions derived from chiral effective field theory at various orders. We therefore conclude that nuclear theory uncertainty is more likely not the source of the discrepancy.

    Comments:
    updated according to referee's comments
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1711.01199 [pdf]
    PLB(2018)·41 citations
  4. 04

    [Submitted on 3 Nov 2017]

    Transverse Asymmetry in Nucleon Deuteron Scattering in Pionless Effective Field Theory

    Arman Margaryan🇺🇸

    In this dissertation we apply the pionless effective field theory to low energy neutron deuteron elastic scattering process. We calculated some of the polarization observables in neutron deuteron scattering to next-to-next-to-next-to-leading-order, in particular the transverse asymmetry . All of the previous calculations have the same characteristic feature of under-predicting this observable, this is known as the -puzzle. At this order of the pionless EFT new two-body -wave interaction terms enter into the Lagrangian. This interaction terms give crucial contributions to the observable. By varying the interaction coefficients within the allowed error estimates of the pionless EFT we find results that at this order are consistent with the experimental data. Our conclusion is that the -puzzle is likely to be solved within the next few orders of the \EFT. Other observables in neutron-deuteron scattering process are also calculated and are in good agreement with the experimental data.

    Comments:
    Phd Thesis, Duke Univ (2017)
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1711.01245 [pdf]
    1 citation
  5. 05

    [Submitted on 2 Nov 2017] (cross-list from nucl-ex)

    Isospin Dependence of the EMC effect and Short range Correlations

    B. Schmookler🇺🇸 · M. Duer🇮🇱 · A. Schmidt🇺🇸 · S. Gilad🇺🇸 · L.B. Weinstein🇺🇸 · E. Piasetzky🇮🇱 · O. Hen🇺🇸

    Recent studies have shown that the per-nucleon number of Short-Range Correlated (SRC) pairs in nuclei and the strength of the EMC effect are linearly correlated, increasing from light nuclei up to iron and then saturating. This paper shows that the per-proton number of SRC pairs and the strength of the EMC effect are linearly correlated and increase from light to heavy asymmetric neutron-rich nuclei without saturation. These quantities, calculated per neutron, are also linearly related, but saturate (have constant value) remarkably early, starting with 12C. We propose that the observed phenomenological relationships indicate an isospin dependence of the EMC effect which is associated with the dominance of SRCs by neutron-proton pairs from 3He to heavy asymmetric neutron-rich nuclei.

    Comments:
    Having discussed this work with the community, we found several shortcomings that require its withdrawal. There is no way to update it at the present time to address the issues raised. We therefore ask to withdraw it
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1711.00960 [pdf]
    0 citations
  6. 06

    [Submitted on 3 Nov 2017] (cross-list from hep-ph)

    Cluster Expansion Model for QCD Baryon Number Fluctuations: No Phase Transition at

    Volodymyr Vovchenko🇩🇪 · Jan Steinheimer🇩🇪 · Owe Philipsen🇩🇪 · Horst Stoecker🇩🇪

    A Cluster Expansion Model (CEM), representing a relativistic extension of Mayer's cluster expansion, is constructed to study baryon number fluctuations in QCD. The temperature dependent first two coefficients, corresponding to the partial pressures in the baryon number and sectors, are the only model input, which we fix by recent lattice data at imaginary baryochemical potential. All other coefficients are constructed in terms of the first two and required to match the Stefan-Boltzmann limit at . The CEM allows calculations of the baryon number susceptibilities to arbitrary order. We obtain excellent agreement with available lattice data for the baryon fluctuation measures , , and predict higher order susceptibilities, that are not yet available from Lattice QCD. The calculated susceptibilities are then used to extract the radius of convergence of the Taylor expansion of the pressure. The commonly used ratio test fails due to the non-trivial asymptotic behavior of the Taylor coefficients. At the same time, a more elaborate estimator provides finite convergence radii at all temperatures and in agreement with the singularities of Padé approximants. The associated singularities lie in the complex -plane and appear smoothly connected to the Roberge-Weiss transition at high temperatures and imaginary chemical potential. No evidence for a phase transition at is found.

    Comments:
    7 pages, 4 figures. Version accepted for publication in Physical Review D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1711.01261 [pdf]
    PRD(2018)·87 citations

Affiliations

first authorsco-authorsvia INSPIRE