Sound and light from fractures in scintillators    [PDF]

A. Tantot, S. Santucci, O. Ramos, S. Deschanel, M. -A. Verdier, E. Mony, Y. Wei, S. Ciliberto, L. Vanel, P. C. F. Di Stefano
Prompted by intriguing events observed in certain particle-physics searches for rare events, we study light and acoustic emission simultaneously in some inorganic scintillators subject to mechanical stress. We observe mechanoluminescence in {${Bi}_4{Ge}_{3}{O}_{12}$}, {${CdWO}_{4}$}\ and {${ZnWO}_{4}$}, in various mechanical configurations at room temperature and ambient pressure. We analyze how the light emission is correlated to acoustic emission during fracture. For {${Bi}_4{Ge}_{3}{O}_{12}$}, we set a lower bound on the energy of the emitted light, and deduce that the fraction of elastic energy converted to light is at least $3 \times 10^{-5}$.
View original: http://arxiv.org/abs/1305.3644