819 research outputs found

    On the origin of the reactor antineutrino anomalies in light of a new summation model with parameterized β−\beta^{-} transitions

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    We investigate the possible origins of the norm and shape reactor antineutrino anomalies in the framework of a summation model (SM) where β−\beta^{-} transitions are simulated by a phenomenological Gamow-Teller β\beta-decay strength model. The general trends of the discrepancies to the Huber-Mueller model on the antineutrino side can be reproduced both in norm and shape. From the exact electron-antineutrino correspondence of the SM model, we predict similar distortions in the electron spectra, suggesting that biases on the reference fission-electron spectra could be at the origin of the anomalies

    Electromagnetic field in matter. Surface enhanced Raman scattering

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    The polarization and magnetization degrees of freedom are included in the general treatment of the electromagnetic field in matter, and their governing equations are given. Particular cases of solutions are discussed for polarizable, non-magnetic matter, including quasi-static fields, surface plasmons, propagation, zero-point fluctuations of the eigenmodes, especially for a semi-infinite homogeneous body (half-space). The van der Waals London-Casimir force acting between a neutral nano-particle and a half-space is computed and the response of this electromagnetically coupled system to an external field is given, with relevance for the surface enhanced Raman scattering
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