Pion absorption in3He at 100, 120, and 145 MeV

π+ true absorption cross-section on3He has been measured at 100, 120, and 145 MeV. The maximal total cross-section values of the reaction π+3He→ppp turn out to be 10, 16, and 19 mb, respectively. About 16% of the cross-section corresponds to three-nucleon absorption. The measured angular distribution as a function of the opening angle between the two fast protons has been fitted with the Legendre polynomial expansionA0+A2P2(cos θ). The values of the coefficients turn out to beA0=(1.7±0.5) mb/sr, andA2=(1.4±0.5) mb/sr, in agreement with the values obtained in the study of the pion absorption on deuteron.