Experimental study of inclusive pion double charge exchange reactions in the delta resonance region

Technical Report · Sun Jan 01 04:00:00 EST 1984

OSTI ID:5209649

Wood, S A

An extensive experimental investigation of the inclusive pion double charge exchange (DCX) process has been carried out with pion energies in the region of ..delta..(1232) excitation. The reactions /sup 16/O(..pi../sup +/,..pi../sup -/)X and /sup 40/Ca(..pi../sup +/,..pi../sup -/)X were studied with pion beam kinetic energies of 120, 150, 180, 210, 240 and 270 MeV. With negative pions, the reactions /sup 16/O(..pi../sup -/,..pi../sup +/)X and /sup 40/Ca(..pi../sup -/,..pi../sup +/)X were observed with incident beam energies of 180, 210 and 240 MeV. In addition, some exploratory measurements were performed with carbon and lead targets with 180 MeV pions. At each energy, outgoing pion spectra were measured at three to five angles in the range 25/sup 0/ to 130/sup 0/. These spectrometer-based measurements featured an almost complete coverage of the outgoing pion spectrum, from 15 MeV to the maximum energy for inclusive DCX (typically 30 MeV below the beam energy). This coverage allowed a reliable integration of the spectra so that angular distributions and total cross sections for inclusive DCX could be obtained. The spectra exhibit a large degree of similarity over the range of energies, targets, and scattering angles investigated. DCX is of interest because, by charge conservation alone, at least two nucleons in a nucleus must participate in the reaction. It is thus a natural way to study multiple scattering, which is potentially an important part of pion-nucleus reactions. The data are discussed qualitatively in the context of a double quasi-free scattering mechanism, by comparing the results with a simple two step Fermi Gas model. A simple cascade model of pion-nucleus reactions is also developed and compared with the DCX data. 60 references.

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5209649
• Report Number(s): LA-9932-T; ON: DE84008368
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BARYON RESONANCES
BARYONS
CALCIUM 40 TARGET
CARBON
CHARGE-EXCHANGE REACTIONS
CHARGED-PARTICLE REACTIONS
CORRECTIONS
CROSS SECTIONS
DATA
DELTA-1236 RESONANCES
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
ENERGY SPECTRA
EXPERIMENTAL DATA
FERMI GAS MODEL
FERMIONS
HADRON REACTIONS
HADRONS
INCLUSIVE INTERACTIONS
INFORMATION
INTERACTIONS
LEAD
MATHEMATICAL MODELS
MESON REACTIONS
METALS
MEV RANGE
MEV RANGE 100-1000
MULTIPLE SCATTERING
N RESONANCES
NONMETALS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUMERICAL DATA
OXYGEN 16 TARGET
PARTICLE INTERACTIONS
PION PLUS REACTIONS
PION REACTIONS
RESONANCE PARTICLES
SCATTERING
SPECTRA
TARGETS
TOTAL CROSS SECTIONS