Direction and Polarization Correlations of Successive Gamma-Rays

Experimental arrangements for the measurement of directional and direction-polarization correlations of successive gamma-rays have been set up and considerations given to instrumental corrections and procedures for the analysis of the data. Directional measurements have been made with ${\mathrm{Co}}^{60}$, ${\mathrm{Rh}}^{106}$, ${\mathrm{Sb}}^{124}$, ${\mathrm{As}}^{76}$, and ${\mathrm{Ir}}^{194}$, and direction-polarization measurements with ${\mathrm{Co}}^{60}$, ${\mathrm{Rh}}^{106}$ and ThC". The results are discussed in the light of present information on the systematics of the spins of the excited states of even-even nuclei. The occurrence of mixtures of magnetic dipole and electric quadrupole radiation in directional correlation experiments is summarized.