Gamma-Gamma Directional Correlations in the Decay ofTb160

Abstract

Gamma-gamma directional correlation measurements have been made in the decay of ${\mathrm{Tb}}^{160}$-${\mathrm{Dy}}^{160}$, for the cascades, 87-197 keV, 87-877 keV, 87-960 keV, 87-1175 keV, 197-680 keV, 197-1250 keV, and 298-877 keV. The corresponding angular correlation functions obtained are as follows: $W{\left(\theta \right)}_{87-197\mathrm{keV}}=1+(0.100\mathrm{}\pm 0.001)P_2\left(cos\theta \right)+(0.0087\mathrm{}\pm 0.001)P_4\left(cos\theta \right).\mathrm{}$ $W{\left(\theta \right)}_{87-877\mathrm{keV}}=1-(0.092\mathrm{}\pm 0.001)P_2\left(cos\theta \right)+(0.300\mathrm{}\pm 0.01)P_4\left(cos\theta \right).\mathrm{}$ $W{\left(\theta \right)}_{87-960\mathrm{keV}}=1-(0.07\mathrm{}\pm 0.003)P_2\left(cos\theta \right)+(0.0009\mathrm{}\pm 0.001)P_4\left(cos\theta \right).\mathrm{}$ $W{\left(\theta \right)}_{87-1175\mathrm{keV}}=1+(0.133\mathrm{}\pm 0.04)P_2\left(cos\theta \right)+(0.0700\mathrm{}\pm 0.012)P_4\left(cos\theta \right).\mathrm{}$ $W{\left(\theta \right)}_{197-680\mathrm{keV}}=1+(0.200\mathrm{}\pm 0.002)P_2\left(cos\theta \right)+(0.089\mathrm{}\pm 0.001)P_4\left(cos\theta \right).\mathrm{}$ $W{\left(\theta \right)}_{197-1250\mathrm{keV}}=1+(0.09\mathrm{}\pm 0.001)P_2\left(cos\theta \right)-(0.152\mathrm{}\pm 0.002)P_4\left(cos\theta \right).\mathrm{}$ $W{\left(\theta \right)}_{298-877\mathrm{keV}}=1-(0.126\mathrm{}\pm 0.02)P_2\left(cos\theta \right)-(0.008\mathrm{}\pm 0.01)P_4\left(cos\theta \right).\mathrm{}$