LARGE-ANGLE ELASTIC SCATTERING OF NEGATIVE PIONS BY PROTONS AT 1.51, 2.01, AND 2.53 Bev/C
The differential elastic scattering cross sections for negative pions on protons were measured at incident momenta of 1.51, 2.01, and 2.53 Bev/c with emphasis on the angular region outside the diffraction peak. The purpose of the experiment was to examine the behavior of the largeangle differential elastic cross section as a function of energy from the energy of the highest known resonance in the pion-nucleon system into the region where the total. cross sections appear to be approaching an asymptotic value. The experiment was performed at the Bevatron, using a luminescent chamber system to photograph the tracks of the scattered pion and the recoil proton from a liquid hydrogen target. A total of 2412 elastic scatterings were analyzed at 1.51 Bev/c, 1300 events at 2.01 Bev/c, and 1080 events at 2.53 Bev/c. From the existing data it may be noted that the backward bump, which has a maximum height of 2.1 mb/sr at 900 Mev and 1.1 mb/sr at 1020 Mev, is down to 0.4 mb/sr at 1.51 Bev/c (1.37 Bev), and is not present at 2.01 or 2.53 Bev/c. The angular distributions behind the diffraction peak at 2.01 and 2.53 Bev/c are rougly constant, decreasing from 0.18 mb/sr at 2.01 Bev/c to 0.125 mb/sr at 2.53 Bev/c. Although the data can be taken to suggest some oscillatory structure in this region, they are not inconsistent with an isotropic distribution that might be interpreted as evidence for an S- wave scattering behind the diffraction peak. (Dissertation Abstr.)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-17-037990
- OSTI ID:
- 4635599
- Resource Relation:
- Other Information: Thesis. Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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