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Annual progress report

Description: Elementary particle physics research at the University of Illinois and at high energy particle accelerator laboratories operated by DOE is described. Major accomplishments in 1980 include: determination of the diffractive cross section for production of charmed D mesons in ..pi../sup -/p collisions at 215 GeV/c to be 20 ..mu..b; data acquisition for ..pi../sup -/ beryllium at 215 GeV/c; construction and testing of prototype muon drift tubes for the p anti p detector facility; Monte Carlo studies of the muon trigger rates, background levels and resolutions were done; results of photoproduction for 70 to 200 GeV photons gave cross-sections of 160 +- 70 nb and 390 +- 190 nb per nucleon respectively; the cross-section for photoproduction of the charmed ..lambda../sub c/ baryon was measured; and development of the FASTBUS system. (GHT)
Date: May 1, 1981
Creator: Wattenberg, A. & Simmons, R. O.
Partner: UNT Libraries Government Documents Department

Annual progress report. [Dept. of Physics Univ. of Illinois at Urbana-Champaign]

Description: During the present year, a major effort was put into developing the Mark III detector to be used with the e/sup +/e/sup -/ colliding beams at SPEAR. Data from previous experiments at Fermilab using both neutral and charged particle beams were analyzed, and an approximately seven-month run with the photon beam on hydrogen and deuterium targets was performed. Apparatus for the forthcoming series of experiments using a proton beam with the Chicago Cyclotron Facility at Fermilab was developed and built. The main motivation for all the above experiments was to study the production and decay of states containing charmed quarks. During the coming year a major effort will continue at SLAC with the completion of the Mark III detector and its use in taking initial data. It is anticipated that several years of data taking with the Mark III will be required to obtain a statistically significant number of events of interest. At Fermilab an experiment using a proton beam with the Chicago Cyclotron Facility and a neutron beam in the broad band neutral beam facility will be performed. The data from the previous photoproduction run will be analyzed. In future years at Fermilab, experiments will be performed at increasingly higher energies as they become available. One of the motivations is the possible production of the (weak) intermediate vector bosons by colliding proton and anti-proton beams. For this purpose, a detector for the colliding beams is being developed, as is the so-called FASTBUS system. The scope of the program is best summarized by listing major accomplishments during the present year and the major parts of the program for the coming year. Being administrative in nature, this report contains insignificant amounts of data. (RWR)
Date: June 1, 1980
Creator: Wattenberg, A & Simmons, R O
Partner: UNT Libraries Government Documents Department

Studies of the Rapid Beam Ejector at the Cosmotron

Description: Extraction of the external beam of the cosmotron with maximum efficiency and minimum duration for measurements of the magnetic moment of the lambda hyperon requires addition of a rapid beam ejector (RBE). Early experiments with the RBE give lower ejection efficiency than the standard ejection system. Reconstruction of the RBE with lengthening of the rise time of the system gives improved values. Computer studies that involve solving the equation of motion for the radial betatron oscillation with time increasing perturbation in one section yield information on particle distributions and result in increases of the turn spacings in RBE to prevent betatron oscillation distribution distortions. Ejection efficiency is now the same with and without the RBE. (D.C.W.)
Date: January 16, 1963
Creator: Barton, M. Q.; Kernan, W.; Novey, T.; Warshaw, S. & Wattenberg, A.
Partner: UNT Libraries Government Documents Department

Photoproduction Experiment at Fermilab

Description: The authors propose to continue and extend the program of photoproduction and pair production studies currently being carried out in Experiment E-87. The goals of the physics program they propose are: (1) to look for {mu}{sup {+-}}+e{sup {-+}}{nu}'s final states; (2) to study the mass spectra of hadronic final states which are produced in association with a single charged lepton (electron or muon); and (3) to determine the properties of a selected number of photoproduced multi-body hadronic final states; in particular: {gamma} + A {yields} ({bar p}p{pi}{sup +}{pi}{sup -}) + A {yields} ({pi}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup 0}) + A {yields} (K{sup +}K{sup -}{pi}{sup +}{pi}{sup -}) + A {yields} (K{sup +}K{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup 0}) + A etec., etc. The need for a heavy lepton pair production experiment is more crucial today than when they first proposed this experiment five years ago. The {mu}e pairs observed recently at SPEAR can be interpreted as arising from the decay of 2 GeV/c{sup 2} heavy leptons. They feel there is a compelling need to demonstrate that such {mu}e pairs are observed in at least one other reaction before such an interpretation can be considered completely satisfactory. To the best of their knowledge, the only independent reaction in which one might expect to observe such events is the pair production of heavy leptons. The broad band photon beam at Fermilab is perhaps the only beam in which such a pair production experiment is feasible. In addition, the probability of mis-identifying two hadrons as a {mu}e pair is extremely small (10{sup -6}) at Fermilab energies - several orders of magnitude smaller than at SPEAR. The primary motivation for examining the photoproduced hadronic final states such as {pi}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup 0} and K{sup +}K{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup 0} is to search for structure in ...
Date: October 1, 1975
Creator: Knapp, B.; Lee, W.; Moscoso, L.; Sokolsky, P.; U., /Columbia; Gladding, G. et al.
Partner: UNT Libraries Government Documents Department