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Calibration of a CsI(Tl) crystal with nuclear recoils and pulse shape measurements for dark matter detection |
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| Authors: | S. P court, B. Chambon, M. de J sus, D. Drain, G. Gerbier, J. Mallet, M. Massaq, L. Mosca, C. Pastor, C. Tao,L. Vagneron |
| Affiliation: | a IPN Lyon, IN2P3-CNRS and Université Claude Bernard Lyon 1, 43 Bd du 11 novembre 1918, F-69622, Villeurbanne Cedex, France b DSM/DAPNIA/SPP, C.E. Saclay, F91191, Gif-sur-Yvette, France c Université Ibnou Zohr, Agadir, Morocco d CPPM, IN2P3/CNRS and Université Aix-Marseille II, 163 ave de Luminy, case 907, F-13288, Marseille Cedex 09, France |
| Abstract: | The quenching factor of cesium and iodine nuclei recoiling in a CsI(Tl) scintillator is measured by scattering of 3 to 6 MeV neutrons. This factor increases when recoil energy decreases, from 7% at 150 keV to 15% at 25 keV. This relatively high efficiency could be useful in experiments dealing with very low recoil energies like the WIMP direct detection. These values are well explained by the Birks model. Pulse shape discrimination between electron and nuclei recoils is also investigated. Results are sufficiently good to allow a significant statistical rejection of radioactive background. This rejection capability is shown to be better than for NaI(Tl), at the same electron equivalent energy. |
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