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Nuclear Theory·nucl-th

Thursday·October 25, 2018

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 01

    [Submitted on 23 Oct 2018]

    Dynamical properties and secondary decay effects of projectile fragmentation in 107,124Sn + 120Sn collisions at 600 MeV/nucleon

    Jun Su · Wolfgang Trautmann · Long Zhu · Wen-Jie Xie · Feng-Shou Zhang

    The formation of the projectile spectator and the fragmentation processes in 107,124Sn + 120Sn collisions at 600 MeV/nucleon are studied with the isospin-dependent quantum molecular dynamics (IQMD) model. The minimum spanning tree algorithm and the ratio of parallel to transverse kinetic quantities are applied to identify the equilibrated projectile spectator during the dynamical evolution. The influence of secondary decay on fragmentation observables is investigated by performing calculations with and without the statistical code GEMINI. The validity of the theoretical approach is examined by comparing the calculated product yields and correlations with the experimental results of the ALADIN Collaboration for the studied reactions.

    Comments:
    7 pages, 4 figures, contribution to the IWM-EC 2018 conference (Catania, Italy), to appear in the proceedings
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1810.10100 [pdf]
    Nuovo Cim.C(2019)·1 citation
  2. 02

    [Submitted on 24 Oct 2018]

    Constraints on shear stress tensor in viscous relativistic hydrodynamics

    A. S. Khvorostukhin🇷🇺 · E. E. Kolomeitsev🇸🇰 · V. D. Toneev🇷🇺

    We extend our hybrid model HydHSD by taking into account shear viscosity within the Israel-Stewart hydrodynamics. The influence of different forms of constraints on observables is analyzed. We show that the form of the corresponding condition plays an important role for the sensitivity of viscous hydrodynamics to the ratio of shear viscosity to the entropy density, . It is shown that the constraint used in the vHLLE model, results in most sensitivity of rapidity distributions and transverse momentum spectra to a change of the ratio; however, their applicability for large values of is doubtful. On the contrary, the strict constraints from \cite{MNR2010} are very strong but most established. We also found that as a function of the collision energy probably has an extremum at AGeV. However, we obtain that any considered condition does not allow to reproduce simultaneously pion and proton experimental data within our model.

    Comments:
    13 figures. arXiv admin note: text overlap with arXiv:1805.11463, arXiv:0906.4426 by other authors
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1810.10303 [pdf]
    1 citation
  3. 03

    [Submitted on 24 Oct 2018]

    Azimuthal angle dependence of the longitudinal spin polarization in relativistic heavy ion collisions

    Yifeng Sun🇺🇸 · Che Ming Ko🇺🇸

    The azimuthal angle dependence of quark spin polarization in the longitudinal beam direction of non-central relativistic heavy ion collisions is studied in the chiral kinetic approach. Contrary to the prediction from models based on the assumption of thermal equilibrium of spin degrees of freedom that the quark spin polarization always points along the direction of local vorticity field, we find the two can have opposite directions due to the effect from the transversal component of vorticity field, which can lead to a redistribution of axial charges in the produced matter. Our finding is consistent with the azimuthal angle dependence of the longitudinal spin polarization of hyperons, which is mainly determined by that of the strange quark, recently measured in the experiments by the STAR Collaboration at the Relativistic Heavy Ion Collider (RHIC).

    Comments:
    5 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1810.10359 [pdf]
    PRC(2019)·71 citations
  4. 04

    [Submitted on 23 Oct 2018] (cross-list from hep-ph)

    Light and heavy flavor dijet production and dijet mass modification in heavy ion collisions

    Zhong-Bo Kang🇺🇸 · Jared Reiten🇺🇸 · Ivan Vitev🇺🇸 · Boram Yoon🇺🇸

    Back-to-back light and heavy flavor dijet measurements are promising experimental channels to accurately study the physics of jet production and propagation in a dense QCD medium. They can provide new insights into the path length, color charge, and mass dependence of quark and gluon energy loss in the quark-gluon plasma produced in reactions of ultra-relativistic nuclei. To this end, we perform a comprehensive study of both light and heavy flavor dijet production in heavy ion collisions. We propose the modification of dijet invariant mass distributions in such reactions as a novel observable that shows enhanced sensitivity to the QGP transport properties and heavy quark mass effects on in-medium parton showers. This is achieved through the addition of the jet quenching effects on the individual jets as opposed to their subtraction. The latter drives the subtle effects on more conventional observables, such as the dijet momentum imbalance shifts, which we also calculate here. Results are presented in Pb+Pb collisions at = 5.02 TeV for comparison to data at the Large Hadron Collider and in Au+Au collisions at = 200 GeV to guide the future sPHENIX program at the Relativistic Heavy Ion Collider.

    Comments:
    17 pages, 16 figures, 1 table. v2: subfigures and references added, version published by PRD
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1810.10007 [pdf]
    PRD(2019)·28 citations
  5. 05

    [Submitted on 23 Oct 2018] (cross-list from nucl-ex)

    How different is the core of F from O?

    T. L. Tang🇯🇵 · T. Uesaka🇯🇵 · S. Kawase🇯🇵 · D. Beaumel🇫🇷 · M. Dozono🇯🇵 · T. Fujii🇯🇵 · N. Fukuda🇯🇵 · T. Fukunaga🇯🇵 · A. Galindo-Uribarri🇺🇸 · S. H. Hwang🇰🇷 · N. Inabe🇯🇵 · D. Kameda🇯🇵 and 35 other authors

    The neutron-shell structure of F was studied using quasi-free (p,2p) knockout reaction at 270A MeV in inverse kinematics. The sum of spectroscopic factors of 0d orbital is found to be . However, the spectroscopic factor for the ground-state to ground-state transition (F, O) is only , and O excited states are produced from the 0d proton knockout. The result shows that the O core of F nucleus significantly differs from a free O nucleus, and the core consists of 35% O. and 65% excited O.

    Comments:
    5 pages, 5 figures
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1810.10113 [pdf]
    PRL(2020)·22 citations

Affiliations

first authorsco-authorsvia INSPIRE