Reaction 58Ni(π+,pp) at Tπ+=160 MeV

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Date
1990-05Author
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.
Preedom, B.M.
Ritchie, B.G.
Blecher, M.
Gotow, K.
Lee, D.M.
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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Show full item recordAbstract
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.