(. pi. ,p) reactions at low excitation energy

Journal Article · Wed Apr 01 04:00:00 EST 1987 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.35.1567· OSTI ID:5977739

Blanpied, G S; Mishra, C S; Adams, G S; Preedom, B M; Whisnant, a C.S.; Egger, J h; Morris, C L; Breuer, H; Chant, N S; Ritchie, B G; others, and

Results of the first experimental search for the excitation of discrete final states following exclusive (..pi../sup -/,p) reactions are reported. The measurements include differential cross section at theta/sub lab/ = 25/sup 0/ for (..pi../sup +- /,p) reactions on /sup 24/Mg, /sup 27/Al, /sup 40/Ca, and /sup 58/Ni at T/sub ..pi../ = 120 MeV and (..pi../sup -/,p) on /sup 12/C at T/sub ..pi../ = 145 MeV. The (..pi../sup -/,p) reactions yield peaks with dsigma/d..cap omega..less than or equal to1 ..mu..b/sr compared to 7--22 ..mu..b/sr for peaks from (..pi../sup +/,p) reactions. The shape of the continuum in an excitation energy range of 10--40 MeV was found to be independent of pion charge and target. The ratios of (..pi../sup +/,p)/(..pi../sup -/,p) averaged over excitation energy and the ratios of the same reaction on different nuclei are presented. The magnitude of the proton yield in the low excitation continuum is more than 20 times larger for ..pi../sup +/ than for ..pi../sup -/, which supports a two-nucleon absorption model including pion charge exchange.

• Research Organization: Department of Physics, University of South Carolina, Columbia, South Carolina 29208
• OSTI ID: 5977739
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 35:4; ISSN PRVCA
• 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
CAPTURE
CHARGE-EXCHANGE REACTIONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ENERGY LEVELS
ENERGY RANGE
EXCLUSIVE INTERACTIONS
EXPERIMENTAL DATA
HADRON REACTIONS
INFORMATION
INTERACTIONS
MAGNESIUM 24 TARGET
MATHEMATICAL MODELS
MESON REACTIONS
MEV RANGE
MEV RANGE 100-1000
NICKEL 58 TARGET
NUCLEAR MODELS
NUCLEAR REACTIONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PION MINUS REACTIONS
PION PLUS REACTIONS
PION REACTIONS
PROTON SPECTRA
SPECTRA
TARGETS