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Scintillation efficiency of nuclear recoils in a CaF-2(Eu) crystal for dark matter search

R. Hazama·S. Ajimura·H. Hayakawa·K. Matsuoka·H. Miyawaki·K. Morikubo·N. Suzuki·T. Kishimoto
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Abstract

The scintillation efficiency (quenching factor) of fluorine and calcium nuclei recoiling in a CaF-2(Eu) crystal was measured in an energy region relevant to dark matter searches. The recoiling nuclei were obtained via the 19-F(n,n') and 40-Ca(n,n') reactions, where the neutron beam was provided via the d(d,n)3-He reaction. The quenching factor of F and Ca nuclei in the CaF-2(Eu) crystal was found to be 11 ~ 20 %, and 9 ~ 23 % relative to the electron equivalent energy for 53 ~ 192 keV and 25 ~ 91 keV recoil energies, respectively, and the energy dependence was observed. The quenching factor we measured here is a little larger than that of previous studies, which may depend on the Eu doping concentration of the crystal.

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R. Hazama, S. Ajimura, H. Hayakawa, K. Matsuoka, H. Miyawaki, K. Morikubo, N. Suzuki, T. Kishimoto. 2001-07-03. Scintillation efficiency of nuclear recoils in a CaF-2(Eu) crystal for dark matter search. https://doi.org/10.1016/s0168-9002(01)01513-3

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