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Nuclear Theory·nucl-th

Thursday·April 27, 2017

9 papers—6 primary·3 cross-listed

All9Primary6Cross-lists3
  1. 07

    [Submitted on 25 Apr 2017] (cross-list from hep-ph)

    Nuclear effects are relevant to the calorimetric reconstruction of neutrino energy

    Artur M. Ankowski🇺🇸

    As the calorimetric method of neutrino-energy reconstruction is generally considered to be largely insensitive to nuclear effects, its application seems to be an effective way for reducing systematic uncertainties in oscillation experiments. To verify the validity of this opinion, we quantitatively study the sensitivity of the calorimetric energy reconstruction to the effect of final-state interactions in an ideal detector and in a realistic scenario. We find that when particles escaping detection carry away a non-negligible fraction of neutrino energy, the calorimetric reconstruction method becomes sensitive to nuclear effects which, in turn, affects the outcome of the oscillation analysis. These findings suggest that the best strategy for reduction of systematic uncertainties in future neutrino-oscillation studies---such as the Deep Underground Neutrino Experiment---is to increase their sensitivity to particles of low energy. The ambitious precision goals appear also to require an extensive development of theoretical models capable of providing an accurate predictions for exclusive cross sections of well-controlled uncertainties.

    Comments:
    5 pages, 2 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1704.07835 [pdf]
    8 citations
  2. 08

    [Submitted on 25 Apr 2017] (cross-list from hep-ph)

    Theoretical Perspective on Quarkonia from SPS via RHIC to LHC

    Ralf Rapp🇺🇸 · Xiaojian Du🇺🇸

    The objective of this paper is to assess the current theoretical understanding of the extensive set of quarkonium observables (for both charmonia and bottomonia) that have been attained in ultrarelativistic heavy-ion collisions over two orders of magnitude in center-of-mass energy. We briefly lay out and compare the currently employed theoretical frameworks and their underlying transport coefficients, and then analyze excitation functions of quarkonium yields to characterize the nature of the varying production mechanisms. We argue that an overall coherent picture of suppression and regeneration mechanisms emerges which enables to deduce insights on the properties of the in-medium QCD force from SPS via RHIC to LHC, and forms a basis for future quantitative studies.

    Comments:
    8 pages, 10 figures; contribution to proceedings of XXVIth International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2017), Chicago (IL, USA), Feb. 05-11, 2017
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1704.07923 [pdf]
    NPA(2017)·36 citations
  3. 09

    [Submitted on 26 Apr 2017] (cross-list from nucl-ex)

    Structure of Ne states in the resonance O+ elastic scattering

    D. K. Nauruzbayev · V. Z. Goldberg · A. K. Nurmukhanbetova · M. S. Golovkov · A. Volya · G. V. Rogachev · R. E. Tribble

    Background The nuclear structure of the cluster bands in Ne presents a challenge for different theoretical approaches. It is especially difficult to explain the broad 0, 2 states at 9 MeV excitation energy. Simultaneously, it is important to obtain more reliable experimental data for these levels in order to quantitatively assess the theoretical framework. Purpose To obtain new data on Ne cluster structure. Method Thick target inverse kinematics technique was used to study the O+ resonance elastic scattering and the data were analyzed using an \textit{R} matrix approach. The Ne spectrum, the cluster and nucleon spectroscopic factors were calculated using cluster-nucleon configuration interaction model (CNCIM). Results We determined the parameters of the broad resonances in \textsuperscript{20}Ne: 0 level at 8.77 0.150 MeV with a width of 750 (+500/-220) keV; 2 level at 8.75 0.100 MeV with the width of 695 120 keV; the width of 9.48 MeV level of 65 20 keV and showed that 9.19 MeV, 2 level (if exists) should have width 10 keV. The detailed comparison of the theoretical CNCIM predictions with the experimental data on cluster states was made. Conclusions Our experimental results by the TTIK method generally confirm the adopted data on cluster levels in Ne. The CNCIM gives a good description of the Ne positive parity states up to an excitation energy of 7 MeV, predicting reasonably well the excitation energy of the states and their cluster and single particle properties. At higher excitations, the qualitative disagreement with the experimentally observed structure is evident, especially for broad resonances.

    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th); Accelerator Physics (physics.acc-ph)
    arXiv:
    1704.08154 [pdf]
    PRC(2017)·26 citations

Affiliations

first authorsco-authorsvia INSPIRE