The method of measurements of endpoint energies of positron spectra by using Ge(Hp)-detector is described. The method has been applied to measure the decay energies of 25 isotopes of rare earths elements. Taking into account effects of the positron back and side scattering, Bremsstrahlung and energy summing of positron and AR (annihilation radiation) pulses allowed to decrease the systematic error of positron endpoint energy determinations up to 30 keV. That is, as a rule, enough for comparisons with mass formulae and for analyzing nuclear decay properties. (author). 7 refs., 5 figs., 1 tab.
Veselov, G V; Sergienko, V A;  Gromov, K Ya; Fominykh, V I; Yuldashev, M B;  Potempa, A;  Potempa, Y 
- Leningradskij Gosudarstvennyj Univ., Leningrad (Russian Federation)
- Joint Inst. for Nuclear Research, Dubna (Russian Federation). Lab. of Nuclear Problems
- Institute of Nuclear Physics, Cracow (Poland)
- AGF, Cracow (Poland)