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    The Rayleigh ratio measurement for SNO+ liquid scintillator and background studies of the internal ropes

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    Date
    2012-09-10
    Author
    Asahi, Satoko
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    Abstract
    As a successor of the Sudbury Neutrino Observatory, the SNO+ experiment is planned

    to start data taking in early 2013. Making use of the liquid scintillator, Linear

    Alkylbenzene (LAB), the SNO+ experiment aims to perform ux measurements of

    low energy solar neutrinos in one phase, and wait for neutrinoless double beta decay

    events in another phase where 44 kg of natural Neodymium would be added into

    LAB.

    The Rayleigh ratio of LAB was found to be 16.60 _ 3.14 _10􀀀6 cm􀀀1 at 546

    nm using the relative measurement technique. The wavelength dependency of the

    Rayleigh scattering was also examined and compared with the theoretical prediction.

    A setup which is usable to measure the angular dependency of the Rayleigh scattering

    was built, and an isotropic behaviour of the scattering was tested. The _ and

    backgrounds, due to the internal calibration ropes situated in the scintillator volume,

    were studied using the SNO+ Monte Carlo Package. Also, the amount of 210Pb

    originating from the internal calibration ropes due to the intrinsic contamination of

    238U, Rn emanation and plated on the surface prior to the installation were assessed

    to examine if it is a tolerable level to achieve the target level of 13.4 background

    events per day.
    URI for this record
    http://hdl.handle.net/1974/7451
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    • Department of Physics, Engineering Physics and Astronomy Graduate Theses
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