Highly Excited Rotational States of Some Nuclei. Intensity ofαDecay to Rotational Excited Levels

Abstract

The $\alpha$ spectra of ${\mathrm{Pu}}^{240}$ and ${\mathrm{U}}^{233}$ have been investigated. A more precise value (8.5±1.5)×${10}^{-4\mathrm{}}$, for the intensity of the ${\mathrm{Pu}}^{240}$ $\alpha$ line corresponding to the transition to the 4+ level of the daughter nucleus has been obtained. New $\alpha$ lines corresponding to the levels with energies 164 kev (0.07±0.04%) and 237 kev (0.04±0.02%) have been found in the $\alpha$ spectrum of ${\mathrm{U}}^{233}$. Thus, successive transitions to rotational levels starting from the ground level (spin $\frac{5}{2}$) and up to the level with spin $\frac{15}{2}$ have been observed.