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Kruse, U.E. Terreault, Bernard 2011-07-11T20:45:05Z 2011-07-11T20:45:05Z 10000-01-01 1969 "The 72"" Bubble Chamber at the Lawrence Radiation Laboratory has been exposed to a beam of 5 Bev/c pi- mesons and 150,000 photographs have been taken. As a part of this experiment, the interactions producing four charged particles in the final states have been measured and the reaction pi-p -> ppi+pi-pi- has been studied, with the emphasis placed on the three pions system. The cross section for this reaction was found to be 1.80±0.45 mba For the final analysis 6300 events (.286 ± .071 pb/event) were selected. The mass spectra of the different particle combinations have been investigated. The reaction has been found to be characterized by the following features: (1) Strong production of well-known resonances, in particular the p (35% of the events), N1236 (30%) and various N IS. (2) A broad enhancement in the pi+pi-pi- and in the popi mass between 1.0 and 1.4 Bev, associated wllh momentum transfers to the proton characteristic of diffraction-scattering. The data below the A2 mass (1.26 Bev) are consistent with this enhancement being a state of spinparity I+ with J = 0 along the incident pion direction. It does not z appear to be entirely due to a Deck-type kinematic effect. (3) Three peaks of marginal statistical significance in the pi+pi-pi- mass, with masses (and widths) 1.06 Bev (40 Mev), 1.17 Bev (60 Mev) and 1.475 Bev (30 Mev). (4) Peripheral production of a meson of mass 1.62 Bev, width about 100 Mev, decaying into pi+pi-pi-,and known as the A3 meson. Its spin-parity is most probably 2-." Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-11T20:45:05Z No. of bitstreams: 1 1969_terreault.pdf: 3472127 bytes, checksum: f673666afdb1df47035c272d273696d3 (MD5) Made available in DSpace on 2011-07-11T20:45:05Z (GMT). No. of bitstreams: 1 1969_terreault.pdf: 3472127 bytes, checksum: f673666afdb1df47035c272d273696d3 (MD5) Previous issue date: 1969 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-11T20:45:05Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:32:46-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only 6066114 http://hdl.handle.net/2142/25776 en 1969 Bernard Terreault charged pions pi proton interactions hydrogen bubble chamber Production of three charged pions in pi minus proton interactions at 5 Bev/c Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.