The University of Pittsburgh Scattering Project

A scattering program at the University of Pittsburgh uses charged particles from the cyclotron (8‐Mev protons, 16‐Mev deuterons, and 32‐mev alpha‐particles). An electromagnet focuses the cyclotron beam through an aperture in an 8‐ft shielding wall into a scattering laboratory; a second magnet analyzes the beam in energy; a third magnet analyzes the energy of the charged particles produced in the reaction. For $\frac{1}{16}-\mathrm{in}$ . analyzing slits 1.0 microamperes of 8±0.010‐Mev protons are available at the target 31 ft distant from the cyclotron. The reaction particle analyzer can be rotated about the target. The energy dispersion for 5.298‐Mev alpha‐particles is 0.192 Mev/in. for each analyzer; the momentum resolution is 1 part in 850. The detector is a scintillation counter. The energy determinations at present stage of development are thought to be accurate to ±0.2 percent ascribed to magnet calibration uncertainties. Energies above and below this value are thought to be of the same precision but the actual calibrations have not been completed.