2,508 research outputs found

    Exploration of nonlocalities in ensembles consisting of bipartite quantum states

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    It is revealed that ensembles consisting of multipartite quantum states can exhibit different kinds of nonlocalities. An operational measure is introduced to quantify nonlocalities in ensembles consisting of bipartite quantum states. Various upper and lower bounds for the measure are estimated and the exact values for ensembles consisting of mutually orthogonal maximally entangled bipartite states are evaluated.Comment: The title and some contents changed, 4 pages, no figure

    The study of neutron spectra in water bath from Pb target irradiated by 250MeV/u protons

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    The spallation neutrons were produced by the irradiation of Pb with 250 MeV protons. The Pb target was surrounded by water which was used to slow down the emitted neutrons. The moderated neutrons in the water bath were measured by using the resonance detectors of Au, Mn and In with Cd cover. According to the measured activities of the foils, the neutron flux at different resonance energy were deduced and the epithermal neutron spectra were proposed. Corresponding results calculated with the Monte Carlo code MCNPX were compared with the experimental data to check the validity of the code.Comment: 6 pages,9 figure

    Response of gadolinium doped liquid scintillator to charged particles: measurement based on intrinsic U/Th contamination

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    A measurement is reported for the response to charged particles of a liquid scintillator named EJ-335 doped with 0.5% gadolinium by weight. This liquid scintillator was used as the detection medium in a neutron detector. The measurement is based on the in-situ α\alpha-particles from the intrinsic Uranium and Thorium contamination in the scintillator. The β\beta-α\alpha and the α\alpha-α\alpha cascade decays from the U/Th decay chains were used to select α\alpha-particles. The contamination levels of U/Th were consequently measured to be (5.54±0.15)×1011(5.54\pm0.15)\times 10^{-11} g/g, (1.45±0.01)×1010(1.45\pm0.01)\times 10^{-10} g/g and (1.07±0.01)×1011(1.07\pm0.01)\times 10^{-11} g/g for 232^{232}Th, 238^{238}U and 235^{235}U, respectively, assuming secular equilibrium. The stopping power of α\alpha-particles in the liquid scintillator was simulated by the TRIM software. Then the Birks constant, kBkB, of the scintillator for α\alpha-particles was determined to be (7.28±0.23)(7.28\pm0.23) mg/(cm2^{2}\cdotMeV) by Birks' formulation. The response for protons is also presented assuming the kBkB constant is the same as for α\alpha-particles.Comment: 12 pages, 10 figures, 3 tables, prepared for submission to JINS
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