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. 2005 Jun 1;110(3):283-8.
doi: 10.6028/jres.110.040. eCollection 2005.

First Tests of (6) Li Doped Glass Scintillators for Ultracold Neutron Detection

G Ban  1 , X Fléchard  1 , M Labalme  1 , T Lefort  1 , E Liénard  1 , O Naviliat-Cuncic  1 , P Fierlinger  2 , K Kirch  2 , K Bodek  3 , P Geltenbort  4
Affiliations

First Tests of (6) Li Doped Glass Scintillators for Ultracold Neutron Detection

G Ban et al. J Res Natl Inst Stand Technol. .

Abstract

We report the results of test measurements aimed at determining the performances of (6)Li doped glass scintillators for the detection of ultra-cold neutrons. Four types of scintillators, GS1, GS3, GS10 and GS20, which differ by their (6)Li concentrations, have been tested. The signal to background separation is fully acceptable. The relative detection efficiencies have been determined as a function of the neutron velocity. We find that GS10 has a higher efficiency than the others for the detection of neutrons with velocities below 7 m/s. Two pieces of scintillators have been irradiated with a high flux of cold neutrons to test the radiation hardness of the glasses. No reduction in the pulse height has been observed up to an absorbed neutron dose of 1 × 10(13) cm(-3).

Keywords: UCN detectors; glass scintillators.

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Figures

Fig. 1
Fig. 1
Two dimensional distribution between the amplitude of the slow component, QF, and the total charge, QT. The projected spectra are shown on the top and on the side.
Fig. 2
Fig. 2
Two dimensional distribution between the TOF and the total charge QT from the PMT. The projected spectra are shown on the top and on the side.
Fig. 3
Fig. 3
Total charge distribution and associated accidental background for the GS10 scintillator.
Fig. 4
Fig. 4
Time of flight distributions after subtraction of accidental events, normalized to the total number of counts.
Fig. 5
Fig. 5
Velocity distribution of UCN from the PF2 source, deduced from the TOF measurement with a GS10 glass scintillator.
Fig. 6
Fig. 6
Lower edge of the velocity distributions obtained with GS10, GS1 and GS20 glass scintillators. The vertical lines indicate the calculated critical velocities.
Fig. 7
Fig. 7
Efficiencies of GS1 and GS20/GS3 relative to GS10. See text for details.
See this image and copyright information in PMC

References

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    1. Baker CA, et al. Nucl Instrum Methods Phys Res A. 2002;487:511.

    1. Applied Scintillation Technologies, Phosphor/Scintillator Data Sheet 41, 41a and 41b

    1. Neutron News. 1992;3(3):29.

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