Neutron to Gamma Pulse Shape Discrimination in Liquid Argon Detectors with High Quantum Effciency Photomultiplier Tubes

A high Light Yield Liquid Argon chamber has been radiated with an Am/Be source for signal-to-background separation level characterization in a Dark Matter Liquid Argon based detector. Apart from the standard nuclear recoil and electron events, from neutron elastic interactions and gamma conversions...

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Bibliographic Details
Published in:Physics procedia 2012, Vol.37, p.1113-1121
Main Authors: Acciarri, R., Canci, N., Cavanna, F., Kryczynski, P., Pandola, L., Segreto, E., Szelc, A.M.
Format: Article
Language:English
Subjects:
Cryogenic Detectors
Dark Matter search
Liquid Argon
Noble Liquid detectors
Particle identiļ¬cation
Pulse Shape Discrimination
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Summary:A high Light Yield Liquid Argon chamber has been radiated with an Am/Be source for signal-to-background separation level characterization in a Dark Matter Liquid Argon based detector. Apart from the standard nuclear recoil and electron events, from neutron elastic interactions and gamma conversions respectively, an intermediate population has been observed which is attributed to inelastic neutron scatters on Argon nuclei producing Argon recoil and simultaneous gammas from nuclear de-excitation. Taking account of these events results in a better determination of the recoil-like to electron-like separation based on the shape of the scintillation pulse. The results of this recent study as well as from a previous study with a chamber with a lower Light Yield are presented.
ISSN:1875-3892
1875-3892
DOI:10.1016/j.phpro.2012.03.732