Reaction sup 58 Ni(. pi. sup + , pp ) at T sub. pi. sup + =160 MeV

Journal Article · Tue May 01 00:00:00 EDT 1990 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.41.2215· OSTI ID:6847955

Burger, W J; Beise, E; Gilad, S; Redwine, R P ^[1]; Roos, P G; Chant, N S; Breuer, H; Ciangaru, G; Silk, J D ^[2]; Blanpied, G S; Preedom, B M; Ritchie, B G ^[3]; Blecher, M; Gotow, K ^[4]; Lee, D M; Ziock, H ^[5]

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1. Department of Physics and Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (USA)
2. Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742 (USA)
3. Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208 (USA)
4. Department of Physics, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 (USA)
5. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (USA)

The reaction {sup 58}Ni({pi}{sup +},{ital pp}) was studied with good energy resolution for an incident pion energy of 160 MeV. The angular correlation of the outgoing protons was measured for {theta}{sub lab}=30{degree}, 75{degree}, and 130{degree}. From these angular correlations the contribution from direct two-nucleon absorption was extracted. A Monte Carlo calculation modeling the absorption process in terms of initial-state scattering of the pion before absorption, two-nucleon absorption, and final-state scattering of the outgoing nucleons is compared to the data. We conclude that within this framework the two-nucleon mechanism can account for less than half of the total absorption cross section in {sup 58}Ni. We report results for the low-energy coincidence proton spectra (down to 5 MeV) which suggest that most of these protons come from evaporation. Angular correlation data for the reaction {sup 58}Ni({pi}{sup {minus}},{ital pp}) are also presented.

• OSTI ID: 6847955
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 41:5; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651520* -- Nuclear Properties & Reactions
A=39-58
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR CORRELATION
BARYONS
CAPTURE
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
CORRELATIONS
CROSS SECTIONS
DATA
DISTORTED WAVE THEORY
ELEMENTARY PARTICLES
ENERGY RANGE
EVAPORATION MODEL
EXPERIMENTAL DATA
FERMIONS
HADRON REACTIONS
HADRONS
IMPULSE APPROXIMATION
INFORMATION
MATHEMATICAL MODELS
MESON REACTIONS
MEV RANGE
MEV RANGE 100-1000
MONTE CARLO METHOD
NICKEL 58 TARGET
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEONS
NUMERICAL DATA
PION PLUS REACTIONS
PION REACTIONS
PROTON SPECTRA
PROTONS
SPECTRA
TARGETS