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Uncertainties in track momentum and direction, due to multiple scattering and measurement errors

Mar, 1963
9 pages
Published in:
  • Nucl.Instrum.Meth. 24 (1963) 381-389
DOI:
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Abstract: (Elsevier)
The effect of measurement errors and multiple scattering on the uncertainties in momenta and direction of bubble chamber tracks is reexamined. Results are given for the rms uncertainty in momentum and direction, and their correlation, for uniform weighting, and both uniform spacing and clustering of the measured points. It is shown that for measurement errors, clustering of measured points at the beginning, end, and center of the track leads to lower rms uncertainties. Estimates of the effect of multiple scattering include the contribution of single and plural small angle scattering outside the central Gaussian region. The contribution of atomic electrons to the multiple scattering is treated separately. In addition the effect of small angle nuclear scattering is included. Some numerical results are presented for a variety of projectiles in liquid hydrogen and propane chambers.