Upper bound for neutron emission from sonoluminescing bubbles in deuterated acetone

An experimental search for nuclear fusion inside imploding bubbles of degassed deuterated acetone at 0°C driven by a 15 atm sound field and seeded with a neutron generator reveals an upper bound that is a factor of 10000 less than the signal reported by Taleyarkhan et al. The strength of our upper bound is limited by the weakness of sonoluminescence, which we ascribe to the relatively high vapor pressure of acetone.