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Nuclear Theory·nucl-th

Monday·October 14, 2019

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 05

    [Submitted on 11 Oct 2019] (cross-list from hep-ph)

    The viability of the 3+1 neutrino model in the supernova neutrino process

    Heamin Ko🇰🇷 · Dukjae Jang🇰🇷 · Motohiko Kusakabe🇨🇳 · Myung-Ki Cheoun🇰🇷

    Adopting the 3+1 neutrino mixing parameters by the IceCube and shortbase line experiments, we investigate the sterile-active neutrino oscillation effects on the supernova neutrino process. For the sterile neutrino (), we study two different luminosity models. First, we presume that the does not interact with other particles through the standard interactions apart from the oscillation with the active neutrinos. Second, we consider that can be directly produced by scattering with matter. In both cases, we find that the pattern of neutrino oscillations can be changed drastically by the in supernova environments. Especially multiple resonances occur, and consequently affect thermal neutrino-induced reaction rates. As a result, Li, Be, B, C, Nb, Tc and La yields in the -process are changed. Among those nuclei, Li and B yields can be constrained by the analysis of observed SiC X grains. Based on the meteoritic data, we conclude that the second model can be allowed while first model is excluded. The viability of the second model depends on the sterile neutrino temperature and the neutrino mass hierarchy.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Theory (nucl-th)
    arXiv:
    1910.04984 [pdf]
    ApJ(2020)·7 citations
  2. 06

    [Submitted on 11 Oct 2019] (cross-list from nucl-ex)

    Three particle Lévy HBT from PHENIX

    Bálint Kurgyis (for the PHENIX Collaboration)🇭🇺

    Bose-Einstein correlations of identical bosons reveal information about the space-time structure of particle emission from the sQGP formed in ultra-relativistic heavy-ion collisions. Previous measurements of two particle correlations have shown that the source can best be described by a symmetric Levy distribution. Here we report on the measurement of three-particle correlations in 0-30 % centrality Au+Au collisions at GeV, and describe them with a Levy type source. This measurement may shed light on hadron creation mechanisms beyond chaotic emission. We measure three particle correlation strength () as a function of pair transverse momentum. This parameter, combined with two-particle correlation strength may reveal the level of chaoticity and coherence in particle production.

    Comments:
    6 pages, 3 figures, Presented at XIV Workshop on Particle Correlations and Femtoscopy, 3-7 June 2019, Dubna, Russian Federation
    Subjects:
    Nuclear Experiment (nucl-ex); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1910.05019 [pdf]
    Phys.Part.Nucl.(2020)·2 citations
  3. 07

    [Submitted on 11 Oct 2019] (cross-list from physics.comp-ph)

    Correlated Gaussians and low-discrepancy sequences

    D. V. Fedorov

    Within the Correlated Gaussian Method the parameters of the Gaussian basis functions are often chosen stochastically using pseudo-random sequences. We show that alternative low-discrepancy sequences, also known as quasi-random sequences, provide bases of better quality.

    Subjects:
    Computational Physics (physics.comp-ph); Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph)
    arXiv:
    1910.05223 [pdf]
    Few Body Syst.(2019)·2 citations
  4. 08

    [Submitted on 27 Sept 2019] (cross-list from physics.plasm-ph)

    X-ray assisted nuclear excitation by electron capture in optical laser-generated plasmas

    Yuanbin Wu · Christoph H. Keitel · Adriana Pálffy

    X-ray assisted nuclear excitation by electron capture (NEEC) into inner-shell atomic holes in a plasma environment generated by strong optical lasers is investigated theoretically. The considered scenario involves the interaction of a strong optical laser with a solid-state nuclear target leading to the generation of a plasma. In addition, intense x-ray radiation from an X-ray Free Electron Laser (XFEL) produces inner-shell holes in the plasma ions, into which NEEC may occur. As case study we consider the -keV transition starting from the 2.4 MeV long-lived Mo isomer that can be used to release the energy stored in this metastable nuclear state. We find that the recombination into inner-shell holes is most efficient in driving the nuclear transition. Already at few hundred eV plasma temperature, the generation of inner-shell holes can allow optimal conditions for NEEC, otherwise reached for steady-state plasma conditions in thermodynamical equilibrium only at few keV. The combination of x-ray and optical lasers presents two advantages: first, NEEC rates can be maximized at plasma temperatures where the photoexcitation rate remains low. Second, with mJ-class optical lasers and an XFEL repetition rate of kHz, the NEEC excitation number can reach depleted isomer per second and is competitive with scenarios recently envisaged at petawatt-class lasers.

    Comments:
    9 pages, 4 figures; minor modifications made; accepted for publication in Physical Review A
    Subjects:
    Plasma Physics (physics.plasm-ph); Nuclear Theory (nucl-th)
    arXiv:
    1910.05326 [pdf]
    PRA(2019)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE