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Energy measurement of pion beams

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Title: Energy measurement of pion beams
Author: Suzuki, Takenori
Degree Master of Science - MSc
Program Physics
Copyright Date: 1976
Subject Keywords Mesons
Abstract: Pion energies between 30 MeV and 60 MeV have been determined by three methods: magnetic field, range and time of flight. The pion energy was measured to an accuracy 2 # by range and 5 % by the time of flight, and the three methods were consistant with one another. The pions which were used were produced by 500 MeV protons from the TRIUMF cyclotron. The pions were focussed into a beam using the M9 (or stopped π/μ) channel. The bending magnets of this channel define the momentum of the beam particles and thus give one method of determining the pion energy. Differential and integral range curves for aluminum and copper were taken and the differential curves were used to determine the range. In taking the differential curve the effect of stopping plates was examined. In the time of flight method, the leading edge; type discriminator was; found to give; a time walk, due to the different energy-loss; of particles in the plastic scintillator. This has a serious effect in determining the pion energies. However, the constant fraction discriminator was found to give dependable results and the measured energies agreed reasonably well with those of the other methods.
URI: http://hdl.handle.net/2429/19851
Series/Report no. UBC Retrospective Theses Digitization Project [http://www.library.ubc.ca/archives/retro_theses/]

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