Measurement of Na and I recoil discrimination and detection efficiency in a cooled 'UVIS' NaI crystal for dark matter searches - INSPIRE

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Measurement of Na and I recoil discrimination and detection efficiency in a cooled 'UVIS' NaI crystal for dark matter searches

N.J.C. Spooner
(
- Sheffield U.
)
,
G.J. Davies
(
- Imperial Coll., London
)
,
C.H. Lally
(
- Imperial Coll., London
)
,
N.J.T. Smith
(
- Imperial Coll., London
)
,
M. van den Putte
(
- Imperial Coll., London
)

1996

9 pages

Published in:

Astropart.Phys. 5 (1996) 299-307

DOI:

10.1016/0927-6505(96)00032-1

View in:

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Abstract: (Elsevier)

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.

95.35
29.40.M
25.40.D
WIMPS
Neutralino
Low background
dark matter
WIMP
n nucleus: elastic scattering
elastic scattering: n nucleus

References(19)

Figures(0)

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