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The relative conversion line intensities of the 35 keV transition in 125Te were measured using the 50 cm ~ ]/2 iron-yoke magnetic spectrometer. The transition was proved to be of M1 +(8.7_+1.5)x 10-4E2 multipolarity, the magnetic component being affected by the nuclear structure with ),=2.4_+ 1.4. The conversion intensity ratio, O/N 1, was determined to be 0.115-+0.005 for both Ag~25I and Cu125I sources. It is in accordance with previous measurements for the ZnlZSmTe and PblZS"Te sources and differs from those for the 12S"TeO2 and Na2HlZSmTeO6 ones. The conversion coefficients were calculated for 32 configurations of the valence shell of free tellurium atom and ions and were compared with the experimental results.

The β-spectrum of 241 Pu with the endpoint energy of 20.8 keV was measured in the energy range from 0.2 to 9.2 keV. The spectra were recorded during 5700 h with an electrostatic spectrometer set to a resolution of E/E = 0.011. Electron energy losses within the radioactive source were treated by means of extensive Monte Carlo simulations of individual elastic and inelastic electron collisions. The upper limit for the admixture of hypothetical neutrinos with the rest masses between 14 and 17 keV/c 2 was derived to be less than 0.40% (the lowest limit being 0.10% for the 16 keV/c 2 mass) at the 95% C.L., independently of any free phenomenological parameter.

The K Auger electrons of two low Z elements emitted in the radioactive decay of 5'Cr and 54Mn were analyzed with an electrostatic spectrometer at instrumental resolution of 7 eV. Discrepancies reaching 4-7 standard deviations (U) were observed for both elements among the measured relative KL, L , ( ' S o ) , KL, L,('P,) and KL,L,('D,) intensities and those calculated relativistically in the intermediate coupling scheme with configuration interaction. The experimental KL,M,,,/KL,M,,, intensity ratios for Z = 23 and 24 were found to agree within 3~7 with recent calculations in the intermediate coupling scheme while their deviations from the j-j coupling predictions exceed 1 2 ~. Except for transitions involving the M4,5 and N electrons, agreement within 30 was proved among measured energy differences within the KLL and KLM groups and semiempirical values of Larkins.