Directional Correlation of Gamma Rays inGe72

Abstract

Directional correlation measurements have been made on the 0.63-0.835 Mev, 2.20-0.835 Mev, 2.49 and 2.51-0.835 Mev, and 1.88-1.46 Mev gamma-gamma cascades in ${\mathrm{Ge}}^{72}$ following beta decay of 14.2-hour ${\mathrm{Ga}}^{72}$. The level at 0.835 Mev has a spin and parity assignment of 2+ and proceeds to the 0+ ground state by pure electric quadrupole radiation. The 0.63-Mev transition proceeds from a 2+ level at 1.46 Mev to the 0.835-Mev level by radiation which is largely electric quadrupole with a small magnetic dipole admixture. The correlation data are consistent with spin assignments of 2 or 3 for the levels at 3.04, 3.32, and 3.34 Mev.