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Title:Production of three charged pions in pi minus proton interactions at 5 Bev/c
Author(s):Terreault, Bernard
Doctoral Committee Chair(s):Kruse, U.E.
Department / Program:Physics
Subject(s):charged pions
pi proton interactions
hydrogen bubble chamber
Abstract: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-.
Issue Date:1969
Genre:Dissertation / Thesis
Rights Information:1969 Bernard Terreault
Date Available in IDEALS:2011-07-11
Identifier in Online Catalog:6066114

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