Calibration of a CsI(Tl) crystal with nuclear recoils and pulse shape measurements for dark matter detection

Details Calibration of a CsI(Tl) crystal with nuclear recoils and pulse shape measurements for dark matter detection Calibration of a CsI(Tl) crystal with nuclear recoils and pulse shape measurements for dark matter detection

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aph....11..457p&link_type=abstract

Astroparticle Physics, Volume 11, Issue 4, p. 457-462.

Physics

18

Scientific paper

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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