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Abstract
Effect of neutron irradiation at LNT on the color center formation in CaF 2 crystals was investigated. A peculiar absorption band system was obtained. It differs either from the usual four band spectrum or from the spectrum of the crystals neutron-irradiated at pile temperature. In addition to the bands observed in CaF 2 crystals irradiated with neutrons at pile temperature, appears a band peaking at 580 nm, which grows with increasing neutron dose. The F band could not be observed. Change of the defect state during storage and effect of temperature rise on color centers are discussed and used for the explanation of the absence of the F band in crystals irradiated at low temperatures. Optical bleaching study shows that the main band at 420 nm is composed of at least two different bands. A band at 535 nm, which is characteristic of neutron irradiation, shows a fine structure at liquid helium temperature. Brief comments are made on the center responsible for this band.
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