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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.

The performance tests were done for a 1.6 cell s-band BNL-type photocathode RF electron gun, GUN-IV, under a condition of 1.5MW RF power input and 266nm Nd:YAG laser pulse irradiation. As a result, the maximum energy and the maximum charge/ bunch were obtained as 1.6 MeV and 120 pC/bunch, respectively. In addition, a sinusoidal behavior of current with the polarization angle of laser light were measured. Furthermore, the change in current as a function of laser injection phase was measured and reasonably reproduced by a numerical calculation.

The atomic mass excesses of '~Pb,~Po, Rn, ' Ra, and ' Th were determined to be -26.262+0.015, -18.352+0.015, -9.667+0.015, -0.208+0.015, and 10.287+0.017 MeV, respectively. They were obtained from the measured Q value of -28.043+0.013 MeV for the Pb(a, 'He) Pb (g.s.) reaction and the known alpha-decay g values. The results were compared with some predicted values.