Complex Alpha and Gamma Spectra ofCf250,252

The alpha and gamma spectra of ${\mathrm{Cf}}^{250}$ and ${\mathrm{Cf}}^{252}$ have been investigated with an alpha-particle spectrograph and an alpha-particle gamma-ray coincidence counter. Alpha groups of 6.112 (84.5%) and 6.069 Mev (15.5%) belonging to ${\mathrm{Cf}}^{252}$ were found, as were groups of 6.024 (83%) and 5.980 Mev (17%), belonging to ${\mathrm{Cf}}^{250}$. $L$ x-rays and gamma rays of 42 (0.014%) and 100 kev (${0.01}_3$%) were assigned to ${\mathrm{Cf}}^{252}$. Other gamma rays were assigned to odd-mass californium isotopes. The results are evaluated with respect to the current theory and systematics of complex alpha spectra and excited states of even-even nuclei.