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Nuclear Theory·nucl-th

Tuesday·May 23, 2017

10 papers—8 primary·2 cross-listed

All10Primary8Cross-lists2
  1. 09

    [Submitted on 12 Nov 2015] (cross-list from hep-ph)

    Diffusion of dark matter in a hot and dense nuclear environment

    Marina Cermeño🇪🇸 · M. Ángeles Pérez-García🇪🇸 · Joseph Silk🇺🇸

    We calculate the mean free path in a hot and dense nuclear environment for a fermionic dark matter particle candidate in the GeV mass range interacting with nucleons via scalar and vector effective couplings. We focus on the effects of density and temperature in the nuclear medium in order to evaluate the importance of the final state blocking in the scattering process. We discuss qualitatively possible implications for opacities in stellar nuclear scenarios, where dark matter may be gravitationally accreted.

    Comments:
    17 pages, 7 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Theory (nucl-th)
    arXiv:
    1511.04071 [pdf]
    PRD(2016)·11 citations
  2. 10

    [Submitted on 18 May 2017] (cross-list from physics.ins-det)

    Developing diagnostic tools for low-burnup reactor samples

    Patrick Jaffke · Benjamin Byerly · Jamie Doyle · Anna Hayes · Gerard Jungman · Steven Myers · Angela Olson · Donivan Porterfield · Lav Tandon

    We test common fluence diagnostics in the regime of very low burnup natural uranium reactor samples. The fluence diagnostics considered are the uranium isotopics ratios U/U and U/U, for which we find simple analytic formulas agree well with full reactor simulation predictions. Both ratios agree reasonably well with one another for fluences in the mid range. However, below about the concentrations of U are found to be sufficiently low that the measured U/U ratios become unreliable. We also derive and test diagnostics for determining sample cooling times in situations where very low burnup and very long cooling times render many standard diagnostics, such as the Am/Pu ratio, impractical. We find that using several fragment ratios are necessary to detect the presence of systematic errors, such as fractionation.

    Comments:
    7 pages, 4 figures
    Subjects:
    Instrumentation and Detectors (physics.ins-det); cond-mat.mtrl-sci (cond-mat.mtrl-sci); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1705.07738 [pdf]
    Phys.Rev.Applied(2017)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE