No abstract

No abstract

No abstract

No abstract

The angular distribution of nucleons from a kinematically complete measurement of pions absorbed in H on nucleon pairs with isospin T =0 and T = 1 at incident pion energies of 119, 206, and 300 MeV are presented. The T =0 data are quite similar to pion absorption data in deuterium. The integrated absorption cross sections scale within errors with the number of isoscaler neutron-proton pairs. The T =1 cross sections, which correspond to absorption on dineutrons, are an order of magnitude smaller. The angular distributions for isovector absorption show a significant asymmetry, indicating interference effects between amplitudes with or without b isobars in the intermediate states. The existence of a significant three-nucleon absorption component is established. The integrated absorption cross sections for processes involving two and three nucleons were determined. The neutron and proton momentum probability densities in H were determined from the spectator recoil resulting from quasifree twonucleon pion absorption.PACS number(s): 25.80.Ls, 25.10.+s