J. Phys. Colloques 48 (1987) C9-835-C9-837
INELASTIC AND ANOMALOUS ELASTIC SCATTERING OF 88.03 keV GAMMA RAYSP.P. KANE1, G. BASAVARAJU2, S.M. LAD2, K.M. VARIER3, L. KISSELL4, 5 and R.H. PRATT4
1 Department of Physics, University of Warwick. GB-Coventry CV4 7AL. Great-Britain
2 Department of Physics, Indian Institute of Technology, Powai, Bombay 400076, India
3 Department of Physics, University of Calicut, Kerala State 673635. India
4 Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, U.S.A.
5 Test Planning and Diagnostics Division, Sandia National Laboratories, Albuquerque, NM 87185, U.S.A.
Cross sections for the elastic scattering of 88.03 keV gamma rays through 125 degrees by aluminium, gold, lead and bismuth have been measured with a semiconductor detector. Simultaneously information has been obtained regarding resonance Raman scattering and Compton scattering in the case of bismuth, and K shell photoeffect cross sections in the case of gold and lead. Values accurate to about 8% were determined with the help of a normalization technique relying on a comparison with the Compton scattering counts from the low atomic number aluminium target. The elastic scattering cross section of aluminium at the chosen photon energy, which is far above the aluminium K shell threshold, is in reasonable accord with form factor and S matrix calculations based on the independent particle approximation. For gold, 7.3 keV above its threshold, the experiment agrees with the S matrix prediction. However, for lead some 25 eV above threshold, the experimental value is about 40% larger than predicted; while for bismuth (2.5 keV below threshold), experiment lies 70% above theory. The measured K shell photo effect cross section of lead is within 10% of the prediction based on the independent particle approximation.