Reaction 58Ni(π+,pp) at Tπ+=160 MeV
Reaction 58Ni(π+,pp) at Tπ+=160 MeV
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Date
1990-05
Authors
Burger, B.J.
Beise, E.J.
Gilad, S.
Redwine, R.P.
Roos, P.J.
Chant, N.S.
Breuer, H.
Ciangaru, G.
Silk, J.D.
Blanpied, J.S.
Advisor
Citation
Burger, B.J. et al. "Reaction 58Ni(π+,pp) at Tπ+=160 MeV." Physical Review C 41, no. 5 (1990): 2215-2228.
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Abstract
The reaction 58Ni(π+,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 θlab=30°, 75°, and 130°. 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 58Ni. 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 58Ni(π-,pp) are also presented.