Absorption of 5.3-Mev, 10.3-Mev, and 17.6-Mev Gamma-Rays

Abstract

Gamma-ray absorption cross sections have been measured for Cu, Sn, Pb, and U at each of the gamma-ray energies, 5.3-Mev, 10.3-Mev, and 17.6-Mev. Betatron radiation collimated to give "good" geometry is used for the transmission measurements. The energy sensitive detector used is a 180° homogeneous magnetic field pair spectrometer with crystal-and-photomultiplier detectors. The measured cross sections in units of barns per atom are at 5.3 Mev, 3.244 (Cu), 7.05 (Sn), 15.07 (Pb), and 18.43 (U); at 10.3 Mev, 3.285 (Cu), 7.95 (Sn), 17.83 (Pb), and 21.73 (U); and at 17.6 Mev, 3.688 (Cu), 9.22 (Sn), 20.47 (Pb), and 25.32 (U). The statistical errors range from 0.5 percent to 1.5 percent.