Semiconductor spectrometer for beams of low-energy positive pions

A device for measurement of the momentum distribution of a beam of low-energy positive pions is described. A spectrum is determined by measurement of the energies of associated heavy charged particles (p, d, t, and α) in a thin semiconductor detector. The accuracy of determination of average beam momentum is less than or ≤ 10-3. The proposed method permits real-time monitoring and correction of the parameters of a pion beam in an accelerator experiment