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Nuclear Theory·nucl-th

Thursday·June 11, 2015

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 01

    [Submitted on 10 Jun 2015]

    Systematic analysis of hadron spectra in p+p collisions using Tsallis distribution

    H. Zheng🇮🇹 · Lilin Zhu🇨🇳 · A. Bonasera🇮🇹

    Using the experimental data from the STAR, PHENIX, ALICE and CMS programs on the rapidity and energy dependence of the spectra in p+p collisions, we show that a universal distribution exists. The energy dependence of temperature and parameter of the Tsallis distribution are also discussed in detail. A cascade particle production mechanism in p+p collisions is proposed.

    Comments:
    13 pages, 8 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1506.03156 [pdf]
    PRD(2015)·59 citations
  2. 02

    [Submitted on 10 Jun 2015]

    Statistical features of the thermal neutron capture cross sections

    M. S. Hussein🇧🇷 · B. V. Carlson🇧🇷 · A. K. Kerman🇺🇸

    We discuss the existence of huge thermal neutron capture cross sections in several nuclei. The values of the cross sections are several orders of magnitude bigger than expected at these very low energies. We lend support to the idea that this phenomenon is random in nature and is similar to what we have learned from the study of parity violation in the actinide region. The idea of statistical doorways is advanced as a unified concept in the delineation of large numbers in the nuclear world. The average number of maxima per unit mass, in the capture cross section is calculated and related to the underlying cross section correlation function and found to be , where is a characteristic mass correlation width which designates the degree of remnant coherence in the system. We trace this coherence to nucleosynthesis which produced the nuclei whose neutron capture cross sections are considered here.

    Comments:
    7 pages, 6 figures. To appear in Acta Physica Polonica B as a Contribution to the proceedings of:Jagiellonian Symposium of Fundamental and Applied Subatomic Physics, June 7- 12, 2015 Krakow, Poland
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1506.03246 [pdf]
    Acta Phys.Polon.B(2016)·4 citations
  3. 03

    [Submitted on 10 Jun 2015]

    Baryon Number Fluctuations from a Crossover Equation of State Compared to Heavy-Ion Collision Measurements in the Beam Energy Range = 7.7 to 200 GeV

    M. Albright🇺🇸 · J. Kapusta🇺🇸 · C. Young🇺🇸

    Fluctuations of the proton number distribution in central Au-Au collisions have been measured by the STAR collaboration in a beam energy scan at the Relativistic Heavy Ion Collider (RHIC). The motivation is a search for evidence of a critical point in the equation of state. It was found that the skewness and kurtosis display an interesting energy dependence. We compare these measurements to an equation of state which smoothly interpolates between an excluded volume hadron resonance gas at low energy density to a perturbative plasma of quarks and gluons at high energy density. This crossover equation of state agrees very well with the lattice QCD equation of state. The crossover equation of state can reproduce the data if the fluctuations are frozen at a temperature significantly lower than the average chemical freeze-out.

    Comments:
    17 pages, 10 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1506.03408 [pdf]
    PRC(2015)·81 citations

Affiliations

first authorsco-authorsvia INSPIRE