Abstract
Angular distributions of elastically-scattered protons, and of deuterons, tritons, and alpha particles from (p,d), (p,t), and (p,α) reactions are being measured with the internal 22-Mev proton beam of the Oak Ridge National Laboratory 86-in. cyclotron. The particles are detected by observing the activities induced by them—Cu(p,n)→38 min for protons, Pb(d,p)→3.3 hr for detuerons, Co(t,p)→1.6 hr for tritons, and P(α,n)→34 min for alphas. Energy discrimination is obtained by absorbers. The energy and energy distribution of the incident beam are found by measuring the excitation function for Cu(p,n) and comparing with published data. The angle of incidence and its inhomogeneity are determined by beam-locating experiments, and checked by the Rutherford law for elastic scattering from heavy elements at small angles. The current is monitored by neutron counters, and measured by counting the activity in the target after bombardment. This is calibrated in a separate run against the published Cu(p,n) cross section. The background is reduced (to <5 percent at most angles) by various types of carbon shielding. Several projects based on these methods have been carried out using the ORNL 86-Inch Cyclotron, and extensions to other types of measurements are in progress.
Submitted Version
Published Version
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