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Pion absorption in nuclei: the (. pi. /sup +/-/, p) reactions

Thesis/Dissertation ·
OSTI ID:5660261
Pion absorption in nuclei has been studied using (..pi../sup +/-/,p) reactions in the region of the delta resonance. Reported here is the first experiment to measure the excitation of discrete final states following the (..pi../sup -/, p) reaction. At EPICS these reactions was measured at T/sub ..pi../ = 120 MeV and theta/sub lab/ = 25/sup 0/ on /sup 24/Mg, /sup 27/Al, /sup 40/Ca and /sup 58/Ni; /sup 12/C(..pi../sup -/,p) was measured at T/sub ..pi../ = 145 MeV. At ..pi..M1-SUSI these reactions were measured at T/sub ..pi../ = 90 MeV and at theta/sub lab/ = 20/sup 0/ on /sup 23/Na and /sup 24/Mg. The measurement includes both the differential cross sections and continuum up to an excitation energy of 40 MeV. The shape of the continuum in an excitation energy range of 10 to 40 MeV was found to be independent of pion charge and target mass. The magnitude of proton yield from all the targets at T/sub ..pi../ = 120 MeV is more than twenty four times larger for ..pi../sup +/ than for ..pi../sup -/. At T/sub ..pi../ = 90 MeV the ratio of the proton yield for ..pi../sup +/ to ..pi../sup -/ adsorption drops down to fourteen.
Research Organization:
South Carolina Univ., Columbia (USA)
OSTI ID:
5660261
Country of Publication:
United States
Language:
English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM 27 TARGET
ANGULAR DISTRIBUTION
CALCIUM 40 TARGET
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CROSS SECTIONS
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MEV RANGE
MEV RANGE 100-1000
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