Pion absorption in tritium at intermediate energies
Abstract
The angular distribution of nucleons from a kinematically complete measurement of pions absorbed in 3H 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 Δ 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 3H were determined from the spectator recoil resulting from quasifree two-nucleon pion absorption.
- Publication:
-
Physical Review C
- Pub Date:
- December 1992
- DOI:
- 10.1103/PhysRevC.46.2172
- Bibcode:
- 1992PhRvC..46.2172S
- Keywords:
-
- 25.80.Ls;
- 25.10.+s;
- Pion inclusive scattering and absorption;
- Nuclear reactions involving few-nucleon systems