The main signature for anti-neutrino detection in reactor and geo-neutrino experiments based on scintillators is provided by the space-time coincidence of positron and neutron produced in the Inverse Beta Decay reaction. Such a signature strongly suppresses backgrounds and allows for measurements performed underground with a relatively high signal-to-background ratio. In an aboveground environment, however, the twofold coincidence technique is not sufficient to efficiently reject the high background rate induced by cosmogenic events. Enhancing the positron-neutron twofold coincidence efficiency may pave the way to future aboveground detectors for reactor monitoring. We propose a new detection scheme based on a threefold coincidence, among the positron ionization, the ortho-positronium (o-Ps) decay, and the neutron capture, in a sandwich detector with alternated layers of plastic scintillator and aerogel powder. We present the results of a set of dedicated measurements on the achievable light yield and on the o-Ps formation and lifetime. The efficiencies for signal detection and background rejection of a preliminary detector design are also discussed.

Consolati, G., Franco, D., Jollet, C., Meregaglia, A., Minotti, A., Perasso, S., et al. (2015). A new anti-neutrino detection technique based on positronium tagging with plastic scintillators. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT, 795, 364-369 [10.1016/j.nima.2015.06.021].

A new anti-neutrino detection technique based on positronium tagging with plastic scintillators

Minotti A.;
2015

Abstract

The main signature for anti-neutrino detection in reactor and geo-neutrino experiments based on scintillators is provided by the space-time coincidence of positron and neutron produced in the Inverse Beta Decay reaction. Such a signature strongly suppresses backgrounds and allows for measurements performed underground with a relatively high signal-to-background ratio. In an aboveground environment, however, the twofold coincidence technique is not sufficient to efficiently reject the high background rate induced by cosmogenic events. Enhancing the positron-neutron twofold coincidence efficiency may pave the way to future aboveground detectors for reactor monitoring. We propose a new detection scheme based on a threefold coincidence, among the positron ionization, the ortho-positronium (o-Ps) decay, and the neutron capture, in a sandwich detector with alternated layers of plastic scintillator and aerogel powder. We present the results of a set of dedicated measurements on the achievable light yield and on the o-Ps formation and lifetime. The efficiencies for signal detection and background rejection of a preliminary detector design are also discussed.
Articolo in rivista - Articolo scientifico
Detector; Neutrino; Positronium; Reactor;
English
364
369
6
Consolati, G., Franco, D., Jollet, C., Meregaglia, A., Minotti, A., Perasso, S., et al. (2015). A new anti-neutrino detection technique based on positronium tagging with plastic scintillators. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT, 795, 364-369 [10.1016/j.nima.2015.06.021].
Consolati, G; Franco, D; Jollet, C; Meregaglia, A; Minotti, A; Perasso, S; Tonazzo, A
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/316669
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