Demonstration of nuclear recoil discrimination using recoil range in a mixed CaF_2+liquid scintillator gel detector for dark matter searches

Details Demonstration of nuclear recoil discrimination using recoil range in a mixed CaF_2+liquid scintillator gel detector for dark matter searches Demonstration of nuclear recoil discrimination using recoil range in a mixed CaF_2+liquid scintillator gel detector for dark matter searches

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aph.....8...13s&link_type=abstract

ASTROPARTICLE PHYSICS, Volume 8, Issue 1-2, p. 13-19.

Physics

5

Scientific paper

We present first measurements on a prototype dark matter detector being developed to achieve event by event discrimination of nuclear recoils from electron recoils below 100 keV by utilising the difference in the recoil ranges of these particles. The detector consists of sub-micron scintillating grains of CaF_2 suspended in Dioxan gel scintillator with matched refractive index. We call this form of detector CASPAR (Cocktail of Alkali halide Scintillating PARticles). We present here results of monoenergetic neutron scattering tests on CASPAR and show how scintillation pulse shape analysis can be used as a powerful means of distinguishing Ca, F, C and H recoil events from electron recoils. >90% discrimination of Ca and F recoils from electrons at 60 keV was observed for <5% loss of signal.

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