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The atomic mass excesses of ' Zr and ' Mo were determined to be -77.807+0.031 and -72. 703+0.021 MeV from the measured Q values of -40. 136+0.030 and -43.278+0.020 MeV for the Zr(a, He)' Zr(g. s.) and Mo(a, 'He) Mo(g. s.) reactions. The results were compared with some predicted values.

Using a computer-controlled drift apparatus, we have developed lithium-ion drift techniques to produce large-size silicon detectors with a high success rate. Based on the improved techniques, we have made detectors with a 115×25×2 mm3 sensitive volume. The variation of the detector sensitivity has been shown to be homogeneous over the measurement area using 1150 nm infrared light.

A 5 inch diameter, 3mm thick silicon detector has been fabricated using a nondetector grade crystal. The detector characteristics of the silicon detector were examined with infrared light as well as a hadron beam.

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