The X-band (9.4GHz) electron spin resonance spectra of the X-ray-, γ- and neutron-irradiated lithium tetraborate single crystals were investigated at room and liquid N temperatures. Neutron irradiation (fluence = 1.7 x 1019/cm2) of the single crystals with natural isotope abundance led to the generation of four types of paramagnetic centers, stable at room temperature. The observed electron spin resonance spectra were described by spin Hamiltonian formalism. Thermal stability of the neutron-induced centers was investigated at 300 to 800K range. The models and new mechanism of formation of the neutron-induced defects in the crystals were suggested.

Radiation-Induced Centers in the Li2B4O7 Single Crystals. Y.V.Burak, B.V.Padlyak, V.M.Shevel: Nuclear Instruments and Methods in Physics Research Section B, 2002, 191[1-4], 633-7