= Shapes of Allowed and Unique First-Forbidden β-Ray Spectra: 114In, 42K, 86Rb, 90Sr, and 90Y by H. Daniel and others
{c}
{tag=Work by H. Daniel}
{title2=1964}
https://doi.org/10.1103/PhysRev.136.B1240
Physical Review 136, B1240. Primary experimental study with a double-lens beta spectrometer. The abstract distinguishes the allowed indium spectrum from the unique first-forbidden potassium, rubidium, strontium and yttrium spectra, and reports deviations from their simplest shape models. This is not an experimental measurement of yttrium-91 or the source exam's plotted points.
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