CROSS-SECTION FOR NON-RUTHERFORD BACKSCATTERING OF ALPHA ON BE

Be is an important element in fusion and fission reactor technology an d in X-ray optical components, Non-Rutherford backscattering is desira ble when the stoichiometry and depth profile of Be and other heavy ele ments have to be measured simultaneously. Cross sections for theta(lab ) = 165 degrees of He-ion backscattering on Be-9 in the 0.88-5.3 MeV e nergy range were measured, Self-supported films of 15 mu g/cm(2) Be we re used as targets, The measured resonance at 5.05 MeV shows a cross s ection 47 times as large as the Rutherford cross section. The relative cross sections are presented in graphic and tabular forms with a typi cal +/- 2.7% uncertainty.