Proposal to study pi- p --> pi0n and pi- p --> eta n at high energy Page: 11 of 37
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has a cross section roughly equal to 0.1 mb. and it is roughly independent of
energy. If we assume 1 mb. cross section for all such processes, then the veto
house must have a rejection of 500 to 1. We obtain this rejection by:
a) Demanding the 7r0 have an energy E o > 0.90 E.. . (Rejection
b) Veto house efficiency for charged particles rejection 99%.
c) Single y veto efficiency > 0.8 .
These requirements taken together will provide sufficient rejection of the
Non-diffractive processes all fall at least as fast as the charge exchange
cross section with increasing energy and the requirements for good veto efficiency
are easily met.
The forward it detector is shown schematically below.
The veto counter insures that charged particles do not trigger the apparatus.
The 2-y rays. from the it convert in the Pb-scintillator converter that is several
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Tollestrup, A.V.; Walker, R.L. & /Caltech. Proposal to study pi- p --> pi0n and pi- p --> eta n at high energy, report, June 1, 1970; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc887653/m1/11/: accessed November 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.