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[en] Angular distributions of differential cross sections were measured for the first time for pion absorption on a T = 1, S = 0 nucleon pair and for absorption on a T = 0, S = 1 pair in the 3He nucleus. A large isospin dependence is observed in the differential cross sections. The ratio of cross sections sigma(3He(π+,2p))/sigma( 3He(π-,pn)) is 15.3 +- 1.2. The results show evidence of an isoscalar component of the final state in the reaction 3He(π-,pn)n, which cannot be mediated by Δ resonance formation
Journal
Physical Review Letters; ISSN 0031-9007; 
; v. 52(14); p. 1203-1206
; v. 52(14); p. 1203-1206