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PHOTOPRODUCTION OF NEGATIVE AND POSITIVE PIONS FROM DEUTERIUM FOR PHOTON ENERGIES 500 TO 1000 Mev

Journal Article · · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
; ;
The ratio of the yields of negative and positive pions photoproduced in deuterium was measured at six photon energies between 500 and 1000 Mev and at seven angles between 20 and 160 deg in the center-of-momentum system of the photon and target nucleon. Pions were selected with a magnetic spectrometer and identified using momentum and specific ionization in a scintillation counter telescope. The spectator model of the deuteron was used to identify the photon energy. Statistical errors were assigned to the pi /sup -// pi /sup +/ ratio range between 5 and 15%. The results of the present experiment join smoothly with the low-energy pi /sup +/ ratios obtained by Sands et al. At high energies the pi /sup -// pi /sup +/ ratio varies from 0.5 at forward angles and energie s near 900 Mev to 2.5 at 160 deg c.m. and energies 600 to 800 Mev. The cross sections for pi /sup -/ photoproduction from neutrons were derived from the pi / sup -// pi /sup +/ ratio and the CalTech pi /sup +/ photoproduction data. The angular distributions for pi /sup -/ production are considerably different from those for pi /sup +/; there is, for example, a systematic increase at the most backward angles. The energy dependence of the total cross section for pi /sup -/ is similar to that for pi /sup +/, although the second resonance peak occurs at a slightly lower energy, and at 900 and 1000 Mev the pi /sup -/ cross section is smaller by a factor of 1.6. A comparison is made of the cross sections for pi / sup +/ photoproduction from hydrogen and deuterium although the accuracy of this comparison is not high. (auth)
Research Organization:
California Inst. of Tech., Pasadena
NSA Number:
NSA-14-024788
OSTI ID:
4137185
Journal Information:
Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 119; ISSN PHRVA
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

ANGULAR DISTRIBUTION
COINCIDENCE METHODS
CROSS SECTIONS
DEUTERIUM
ERRORS
IONIZATION
MAGNETIC FIELDS
MEASURED VALUES
MEV RANGE
MOMENTUM
NUCLEONS
PHOTOPRODUCTION
PHYSICS
PIONS
PIONS-MINUS
PIONS-PLUS
RESONANCE
SCINTILLATION COUNTERS
SPECTROMETERS
TARGETS