Proposal to Study Dilepton Neutrino Interactions with the Triplet Quadrupole Beam, the Phase 1 EMI, and the 15' Bubble Chamber Filled with a H-Ne Mixture Page: 4 of 13
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This will also provide time coincidence between the two planes and
further reduce background. The space behind the chamber is available.
This will add 4 absorption lengths and give a total of 8-10 absorp-
tion lengths. We will need a small "dog house" to house the counters,
which should be very inexpensive. The pit wall of the bubble chamber
building is sufficiently strong to take the concrete load.
For the particles that traverse the 8-10 absorption lengths
there is no problem of punch-through. Events of this type will
comprise our dimuon sample. For lower energy particles that miss
the second plane of counters, we will have to calculate the punch-
through probability for each, since each will traverse a different
amount of absorber due to the magnetic field and varying thicknesses
of absorber. These less well identified muons (a few percent of
the hadrons will punch through) can be used in conjunction with an
identified positron (electron) to establish a sample of events.
Identifying electrons in heavy liquid is very easy after about
a radiation length (30 cm.).
Analysis of the Pictures
1. We expect from experience with other neon 15' bubble chamber
film to be able to scan 15 frames per hour. Thus we can scan the
film in a few months. The first events measured will be those which
have a time coincidence dimuon signal or a muon-positron signal.
We believe we can have preliminary results 5 months after the run.
Here’s what’s next.
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Harris, R.; Huson, F.R.; Kahn, S.; Murphy, T.; Smart, W.; /Fermilab et al. Proposal to Study Dilepton Neutrino Interactions with the Triplet Quadrupole Beam, the Phase 1 EMI, and the 15' Bubble Chamber Filled with a H-Ne Mixture, report, January 1, 1975; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc1014594/m1/4/: accessed January 17, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.