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Nuclear Theory·nucl-th

Friday·August 19, 2022

3 papers—3 primary·0 cross-listed

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  1. 01

    [Submitted on 18 Aug 2022]

    to the first state with two-nucleon mechanism for L-R symmetric model

    Dong-Liang Fang🇨🇳 · Amand Faessler🇩🇪

    We develop the formalism for calculating the decay rate of neutrinoless double beta decay to the excited states within L-R symmetric model. We consider the effects from induced hadronic currents up to NLO. The QRPA method in a spherical basis is adopted for the nuclear many-body calculation and the corresponding nuclear matrix elements are given. Also, the phase space factors are obtained with numerical electron wave functions. Our results suggest that the nuclear matrix elements are nucleus dependent and they are generally smaller than that of the decay to the ground states. And finally, we give a naive analysis of how current experiment data constrains the L-R symmetric model.

    Comments:
    9 pages, 1 figure, figure corrected
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2208.08595 [pdf]
    PRC(2023)·7 citations
  2. 02

    [Submitted on 18 Aug 2022]

    Color coherence effects in the reaction

    A.B. Larionov🇷🇺

    The hard proton knock-out by the proton from the deuteron at relativistic energies is considered with a focus on the color transparency (CT) effect which influences the initial and final state interactions. The calculations are performed in the framework of the generalized eikonal approximation supplemented by the quantum diffusion model of CT. The main results of the previous calculations [1] at the beam momentum below 20 GeV/c are confirmed, including the dependence of the nuclear transparency on the transverse momentum of the spectator neutron, , and on the relative azimuthal angle between proton and neutron: absorption at GeV/c and enhancement at GeV/c due to rescattering on the neutron, the change of -dependence between these two regions, and the enhancement of CT effects with . The study is then generalized to higher beam momenta, up to 75 GeV/c. It is shown that such behavior of the transparency is mainly preserved up to GeV/c, but changes significantly at higher beam momenta due to the interference of valence quark configurations of small and large sizes. As a result, the transparency at small exhibits oscillations as a function of the beam momentum (the nuclear filtering effect). The tensor analyzing power due to the longitudinal polarization of the deuteron is calculated. The event rate at NICA-SPD is estimated.

    Comments:
    39 pages, 12 figures, uncertainty range of CT effect extended according to ref. [49], accepted in Phys. Rev. C
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2208.08832 [pdf]
    PRC(2023)·7 citations
  3. 03

    [Submitted on 18 Aug 2022]

    Exploration of In-Medium Hyperon-Nucleon Interactions

    Madhumita Dhar🇮🇳 · Horst Lenske🇩🇪

    The study focuses on exploring the changes in the hyperon-baryon interaction at various nuclear densities. This approach starts by building a vacuum hyperon-nucleon interaction model based on Boson -Exchange maintaining SU(3) flavor symmetry. Bethe-Goldstone equation is then explored to investigate the medium properties over the bare interaction. A detailed investigation of the density dependence revealed clear changes in the low energy parameters with the variation of the medium density shown for different strangeness channels.

    Comments:
    4 pages, 6 figures, 14th International Conference on Hypernuclear and Strange Particle Physics (HYP2022) proceedings
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2208.08986 [pdf]
    EPJ Web Conf.(2022)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE