Precision Measurement of $${}^{144}$$ce–$${}^{144}$$pr Beta Spectrum by Means of Semiconductor Spectrometer

Precise measurement of beta spectra was always of great importance in some fundamental problems, including those of neutrino physics. The results obtained by measuring the spectrum of a ^144 Ce– ^144 Pr source with setups of two types to a precision substantially improved in relation to earlier investigations are presented. The correctness of a theoretical fit is tested using the shape of the ^144 Pr (0 ^- ) →^144 Nd (1 ^- ) allowed beta transition.