During the past year, we have measured neutron emission from samples of titanium (Ti) metal and sponge in pressurized D 2 gas. In January 1990, we improved our sample preparation procedure and our detector sensitivity level so that the neutron-emission measurements are now reproducible, but not yet predictable. We have measured excess neutron emission from the majority of our most recent samples using our high-sensitivity neutron detectors. The improved sensitivity in our new detector system was obtained by using low-radioactive-background stainless steel tubes, a small detector volume with high efficiency, and additional cosmic-ray shielding. Our most sensitive detector consists of two independent segments making up inner and outer rings of 3He tubes. The combined total efficiency is 44%. In addition to inner and outer ring segments, we have three separate detector systems operating in parallel control experiments to monitor environmental change. We have measured neutron bursts from a variety of samples containing Ti metal and D 2 gas. The low-multiplicity bursts, emitting from 2 to 10 n, occur much more frequently than the higher multiplicity bursts. By measuring high-mass samples (300 g Ti) over several weeks, with many liquid nitrogen temperature cycles, we have detected neutron e mi s s i o n a b o v e t h e b a c k g r o u n d f r o m mo s t o f t h e s a mp l e s wi t h a s i g n i f i c a n c e l e v e l o f 3 t o 9 σ .
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