Positronium Formation and Decay in Organic Scintillators for Neutrino Detection

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The detection of electron anti-neutrinos is generally carried out by searching for the coincidence of the reaction products, neutron and positron, in liquid scintillators. However, in these last a positron may form positronium (Ps) with an electron of the medium; efficiency of the process may be high. Furthermore, the triplet ground state sublevel (o-Ps) has lifetimes of a few ns. These features introduce distortions in the time distribution of the emitted photons, which is essential for position reconstruction and pulse shape discrimination algorithms in anti-neutrino experiments. This drawback can be favorably exploited by using o-Ps as a probe to detect anti-neutrinos in the scintillator. We report results of positron annihilation lifetime measurements in some organic liquid scintillators used for neutrino experiments. The o-Ps induced distortion of the scintillation photon emission time distribution may enhance the anti-neutrino detection.

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Edited by:

Jozef Krištiak, Jan Kuriplach and Pradeep K. Pujari

Pages:

306-309

Citation:

G. Consolati et al., "Positronium Formation and Decay in Organic Scintillators for Neutrino Detection", Materials Science Forum, Vol. 733, pp. 306-309, 2013

Online since:

November 2012

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$38.00

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