Author/Authors :
Kudryavtsev، نويسنده , , V.A and Spooner، نويسنده , , N.J.C and Tovey، نويسنده , , Dr Rodney Roberts، نويسنده , , J.W and Lehner، نويسنده , , M.J and McMillan، نويسنده , , J.E and Lightfoot، نويسنده , , P.K and Lawson، نويسنده , , T.B and Peak، نويسنده , , C.D and Lüscher، نويسنده , , R and Barton، نويسنده , , J.C، نويسنده ,
Abstract :
We report a study of CsI(Tl) scintillator to assess its applicability in experiments to search for dark matter particles. Measurements of the mean scintillation pulse shapes due to nuclear and electron recoils have been performed. We find that, as with NaI(Tl), pulse shape analysis can be used to discriminate between electron and nuclear recoils down to 4 keV. However, the discrimination factor is typically 10–15% better than in NaI(Tl) above 4 keV. The quenching factor for caesium and iodine recoils was measured and found to increase from 11% to ∼17% with decreasing recoil energy from 60 to 12 keV. Based on these results, the potential sensitivity of CsI(Tl) to dark matter particles in the form of neutralinos was calculated. We find an improvement over NaI(Tl) for the spin-independent WIMP–nucleon interactions up to a factor of 5 assuming comparable electron background levels in the two scintillators.
Keywords :
Scintillation detectors , CsI(Tl) crystals , Dark matter , WIMP , Pulse shape discrimination , Inorganic crystals
