SCATTERING OF 80-Mev $pi$ to the minus MESONS BY COMPLEX NUCLEI

Journal Article · Mon Dec 01 04:00:00 EST 1958 · Physical Review (U.S.) Superseded in part by Phys.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.112.1763· OSTI ID:4272403

Baker, W F; Rainwater, J; Williams, R E

The elastic scattering of 80-Mev pi - mesons by lithium, carbon, aluminum, and copper was investigated using a pi - detector which gives improved discrimination against low-energy-loss inelastic events. A "transmission'' scatterer orientstion was necessary to maintaln energy resolution, so oniy less than 120 deg scattering was studied. The new differential scattering cross sections for lithium, aluminum, and copper agree with the previously reported results at small angles but are 2 to 10 iimes smaller at larger angles. There are indications of diffraction structure in aluminum and copper which were not previously observed due to the poorer enerey resolution of the earlier measurements. Including the incident beam energy spread, the detector sensitivity is down by factors of 3 and 9 for E plus or minus 5.0 and E plus or minus 10 Mev when peaked for mean energy E. This was used to separate the scattering from carbon into elastic and inelastic components for excitation of the 4.43 and (7.65 and 9.61) Mev levels. Inelastic scatterings from lithium were also studied. For the same momentum transfer on scattering. the ratio of the inelastic scattering with excitation to the 4.43 and 9.61-Mev levels to the elastic differential scattering cross section is the same. within experimental accuracy, as found by fregeau fur the scattering of 187-Mev electrons on carbon. The elastic scattering is compared with the results of complex square-well phase shift calculations, and with diffuse-edge optical model and modified Kisslinger model calculations. (auth)

• Research Organization: Columbia Univ., New York; Paul Rosenberg Associates, Mount Vernon, N.Y.
• NSA Number: NSA-13-008081
• OSTI ID: 4272403
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 112; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALUMINUM
ANGULAR DISTRIBUTION
BEAMS
CARBON
COPPER
CROSS SECTIONS
DIFFRACTION
ELECTRONS
ENERGY
ENERGY LEVELS
ENERGY RANGE
EXCITATION
LITHIUM
MEASURED VALUES
NUCLEAR MODELS
NUCLEI
OPTICAL MODEL
PHYSICS AND MATHEMATICS
PIONS
PIONS-MINUS
RADIATION DETECTORS
RESOLUTION
SCATTERING
SENSITIVITY
SPECTRAL SHIFT