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Nuclear Theory·nucl-th

Monday·September 24, 2018

9 papers—4 primary·5 cross-listed

All9Primary4Cross-lists5
  1. 01

    [Submitted on 20 Sept 2018]

    Role of charged particle emission on the evaporation residue formation in the Se+Ba reaction leading to the Th compound nucleus

    G. Mandaglio · A. K. Nasirov · A. Anastasi · F. Curciarello · G. Fazio · G. Giardina

    We present detailed results of a theoretical investigation on the production of evaporation residue nuclei obtained in a heavy ion reaction when charged particles (proton and -particle) are also emitted with the neutron evaporation along the deexcitation cascade of the formed compound nucleus. The almost mass symmetric Se+Ba reaction has been studied since there are many experimental results on individual evaporation residue (ER) cross sections after few light particle emissions along the cascade of the Th compound nucleus (CN) covering the wide 12--70 MeV excitation energy range. Our specific theoretical results on the ER cross sections for the Se+Ba are in good agreement with the available experimental measurements, but our overall theoretical results concerning all possible relevant contributions of evaporation residues are several times greater than the ERs measured in experiment. The discrepancy could be due to the experimental difficulties in the identification of ER nuclei after the emission of multiple neutral and charged particles, nevertheless the analysis of ER data is very important to test the reliability of the model and to stress the importance on the investigation of ER nuclei also obtained after charged particle emissions.

    Comments:
    16 pages, 4 figures, Accepted for publication in Nucl. Phys. A
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1809.07798 [pdf]
    NPA(2018)·3 citations
  2. 02

    [Submitted on 20 Sept 2018]

    Current Status of Very-Large-Basis Hamiltonian Diagonalizations for Nuclear Physics

    Calvin W. Johnson🇺🇸

    Today there are a plethora of many-body techniques for calculating nuclear wave functions and matrix elements. I review the status of that reliable workhorse, the interacting shell model, a.k.a. configuration-interaction methods, a.k.a. Hamiltonian diagonalization, and survey its advantages and disadvantages. With modern supercomputers one can tackle dimensions up to about 20 billion! I discuss how we got there and where we might go in the near future.

    Comments:
    To be published in the proceedings of Thirteenth Conference on the Intersections of Particle and Nuclear Physics, Indian Wells, CA, May 28--June 3, 2018; updated reference
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1809.07869 [pdf]
    5 citations
  3. 03

    [Submitted on 20 Sept 2018]

    Towards the determination of heavy-quark transport coefficients in quark-gluon plasma

    Shanshan Cao🇺🇸 · Gabriele Coci🇮🇹 · Santosh Kumar Das🇮🇳 · Weiyao Ke🇺🇸 · Shuai Y.F. Liu🇺🇸 · Salvatore Plumari🇮🇹 · Taesoo Song🇩🇪 · Yingru Xu🇺🇸 · Jörg Aichelin🇫🇷 · Steffen Bass🇺🇸 · Elena Bratkovskaya🇩🇪 · Xing Dong🇺🇸 and 7 other authors

    Several transport models have been employed in recent years to analyze heavy-flavor meson spectra in high-energy heavy-ion collisions. Heavy-quark transport coefficients extracted from these models with their default parameters vary, however, by up to a factor of 5 at high momenta. To investigate the origin of this large theoretical uncertainty, a systematic comparison of heavy-quark transport coefficients is carried out between various transport models. Within a common scheme devised for the nuclear modification factor of charm quarks in a brick medium of a quark-gluon plasma, the systematic uncertainty of the extracted drag coefficient among these models is shown to be reduced to a factor of 2, which can be viewed as the smallest intrinsic systematical error band achievable at present time. This indicates the importance of a realistic hydrodynamic evolution constrained by bulk hadron spectra and of heavy-quark hadronization for understanding the final heavy-flavor hadron spectra and extracting heavy-quark drag coefficient. The transverse transport coefficient is less constrained due to the influence of the underlying mechanism for heavy-quark medium interaction. Additional constraints on transport models such as energy loss fluctuation and transverse-momentum broadening can further reduce theoretical uncertainties in the extracted transport coefficients.

    Comments:
    20 pages in ReVTex with 11 figures, final version to appear in PRC
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1809.07894 [pdf]
    PRC(2019)·200 citations
  4. 04

    [Submitted on 21 Sept 2018]

    Diffusion of charm and beauty in the Glasma

    Marco Ruggieri🇨🇳 · Santosh Kumar Das🇮🇳

    Relativistic nuclear collisions offer a unique way to study strong interactions at very high energy. The collision process can be described within the gluon saturation framework as the interaction of two colored glasses, and because of this interaction strong longitudinal gluon fields, namely the Glasma, are produced immediately after the collision. Besides, heavy quarks are also produced in the very early stage and because of their large mass and small concentration, their motion does not affect the evolution of the Glasma, thus behaving as ideal probes of the Glasma itself. We study the evolution of the heavy quarks in the Glasma allegedly produced in high energy p-Pb collisions by solving consistently the equations of motion of the quarks in the evolving Glasma fields. We find that this motion can be understood in terms of diffusion in momentum space, similarly to the random motion of a heavy probe in a hot thermalized medium. We show how the diffusion of heavy probes affects the nuclear modification factor of D and B mesons in p-Pb collisions.

    Comments:
    Talk given by M. R. at QCD@Work2018 held in Matera, Italy, 25-28 June 2018
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1809.07915 [pdf]
    EPJ Web Conf.(2018)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE