Pion-Proton Elastic Scattering inthe energy Range 300 to 700MeV
Differential cross sections for elastic {pi}-p scattering have been measured at eight energies for positive pions and seven energies for negative pions. Energies ranged from 310 to 650 MeV. These measurements were made at the 3-BeV proton synchrotron at Saclay, France. A beam of pions from an internal BeO target was directed into a liquid hydrogen target. Fifty-one scintillation counters and a matrix-coincidence system were used to measure simultaneously elastic events at 21 angles and charged inelastic events at 78 {pi}-p angle pairs. Events were detected by a coincidence of pulses indicating the presence of an incident pion, scattered pion, and recoil proton and the results were stored in the memory of a pulse-height analyzer. Various corrections were applied to the data and a least-squares fit was made to the results at each energy. The form of the fitting function was a power series in the cosine of the center-of-mass angle of the scattered pion. Integration under the fitted curves gave values for the total elastic cross section. The importance of certain angular-momentum states, particularly the D{sub 13} state near 600 MeV, is discussed. Several possible explanations are given of the enhancement in the {pi}{sup -}-p cross sections near 600 MeV.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USAEC
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 877341
- Report Number(s):
- UCRL-11180; TRN: US200607%%391
- Country of Publication:
- United States
- Language:
- English
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