The Study of Nuclear Mass Difference by the YASNAPP Programme

Abstract

The study of the nuclear mass difference by the YASNAPP programme (Nuclear Spectroscopy on the Proton Beam) has been carried out by means of the beta-spectra end-point energy measurement. The determination of mass difference for nuclei far from the beta-stability line presents considerable difficulties due to the complex decay schemes of these nuclei, the necessity of taking into acount the background under the measured continuum and the instrumental factors distorting the spectra (response function of the spectrometer, the scattering in the source and source backing). There is no universal solution of the problem of accounting all the effects that cause the beta-spectra distortion. Therefore it is necessary to study and to take into account all the possible effects causing the distortion of beta-spectra for each given instrument. Than,the measured positron distribution M(E) should be corrected by the introduction of the respective coefficients accounting for the above mentioned factors. This enables to obtain the real distribution N(E).