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The fl-decay energies of '4VEu, 147Gd, and ~5~Tb were determined by using 7-spectroscopical methods. The comparison of experimental with calculated K-capture probabilities yielded the QEc values 1.690(+_2~)MeV and 2.203C1~)MeV for ~47Eu and ~47Gd, respectively. By measuring the ratio of positron decay to electron capture for two branches in ~4VEu decay, the decay energies QEC=1'702(13) MeV and QEC =l.709(18) MeV were derived. Also from EC/fl + ratios the values QEC=2.225(75) MeV for 147Gd, and QEc=2.566(12)MeV for 15aTb were obtained. Earlier discrepancies in the mass adjustment of these isotopes were removed. In course of the present studies 7-decay properties of ~47Eu and a4VGd were reinvestigated.

176A77tr were produced by, irradiation of 141pr with 4~ I~-delayed y-rays of 176"17qr were observed for the first time. From yy-coincidence data decay schemes could be constructed. A new half-life of 1771r was obtained yielding tl/2 = 30 ( 2 ) s. c~-branching ratios of 3.1 ( 6 ) % for 761r and 0.06(1)% for 1771r were measured.