Physics
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aph.....5..299s&link_type=abstract
ASTROPARTICLE PHYSICS, Volume 5, Issue ASTROPARTICLE PHYSICS, p. 299-307.
Physics
3
Scientific paper
The UVIS dark matter detector, proposed by Spooner and Smith (Phys. Lett. B 314 (1993) 430), consists of <1000 ppm Tl doped NaI scintillator operated at 100-200 K, with measurement of UV and visible scintillation components used to discriminate between electrons (gammas) and Na or I recoils. Presented here are results of measurements of the gamma/nuclear recoil discrimination power of a Kyropolous NaI (0.5 ppm Tl) UVIS test detector operated at 160 K, with monoenergetic neutrons used to induce nuclear recoils via elastic scattering. Defining the statistical gain factor for N events as C_m/N^1/2, the coefficient C_m was measured as a function of photoelectron pulse height. At 40 photoelectrons C_m was found to be 0.5 (corresponding to 90% rejection of gammas with 20% loss of neutron events). The scintillation efficiency for Na and I recoils relative to electrons was also measured at 160 K and found to be 35+/-5% for Na recoils and 10+/-2% for iodine.
Davies Gideon J.
Jagpal P.
Lally C. H.
Lewin J. D.
Smith Nigel J. T.
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