Abstract
The low energy electron spectrum from the α-decay of 225Ac has been measured with 20 eV instrumental resolution using an electrostatic spectrometer and radioactive sources prepared by vacuum evaporation. The predicted 10.642(5) keV M1 + < 0.05% E2 nuclear transition in 221Fr have been revealed. Energies of 26.015(5), 36.660(5), 38.543(3) and 108.37(1) keV nuclear transitions in 221Fr have been essentially improved. Relative intensities of the measured conversion electron lines of these transitions have also been determined.
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