PANOFSKY RATIO FOR NEGATIVE PIONS ABSORBED IN HYDROGEN

Journal Article · Sun Nov 01 04:00:00 EST 1959 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.116.760· OSTI ID:4179232

Koller, E L; Sachs, A M

The ratio of mesonic to radiative capture of stopped negative pions in hydrogen, i.e., the Panofsky rntio, provides a useful link in analyzing the results of photoproduction of pions and pion-nucleon scattering. Previous measurements of the Panofsky ratio indicate possible systematic errors in the experimental techniques. The ratio was measured using (a) a lead glass Cerenkov counter of improved resolution to measure the total energy of the gamma rays ( plus or minus 16% for the 129-Mev gamma rays measured in this experiment), (b) time-of-flight measurement of the 180 degree recoil neutrons to determine the shape of the pulse-height spectrum of the high-energy gamma ray, and (c) a collimator of variable dimensions to test the possible effect of degradation of the high-energy gamma rays in the collimator. The value obtained for the ratio is 1.46 plus or minus 0.10, in good agreement with the Liverpool experiments. (auth)

• Research Organization: Columbia Univ., New York
• NSA Number: NSA-14-006895
• OSTI ID: 4179232
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 116; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
BEAMS
CAPTURE
CHERENKOV COUNTERS
EMISSION
ERRORS
GAMMA SPECTROMETERS
GLASS
HYDROGEN
LEAD
MEASURED VALUES
MESONS
MEV RANGE
NEUTRONS
NUCLEONS
PANOFSKY RATIO
PHOTONS
PHOTOPRODUCTION
PHYSICS
PIONS
PULSE ANALYZERS
RECOILS
RESOLUTION
SCATTERING
SPECTRA
VELOCITY