| Popis: |
Extensive study is made to obtain the total \ensuremath{\gamma}-ray cross sections with an accuracy close to 1% in Pb at 276.4, 295.96, 302.86, 316.508, 356.04, 383.86, 468.07, 484.58, 588.584, 604.414, and 612.465 keV. The basic idea behind these measurements is that the data available on total \ensuremath{\gamma}-ray cross sections are rather meager, especially at higher energies with \ensuremath{\gamma}-ray sources showing highly complex energy distribution. For measuring the cross sections, a transmission experiment is conducted using a good geometry setup and a high-resolution hyperpure germanium detector. In a transmission experiment, there is a chance of underestimation of these cross sections due to small-angle scattering. Photopeaks evaluated must be free from scattering contributions as well as background. Measures are taken to account correctly for the included small-angle scattering. The measured values are compared with the available theoretical, semiexperimental and other experimental data and are in good agreement. The effect of collimation and good geometrical arrangements on the cross section is discussed. |
