Meson exchange currents in the {sup 3}He({gamma},{pi}{sup +}){sup 3}H reaction
- Departamento de Fisica Teorica and Instituto de Fsica Corpuscular, Centro Mixto Universidad de Valencia--Consejo Superior de Investigaciones Cientificas, 46100 Burjassot (Valencia) (Spain)
We generate meson exchange currents mechanisms for the ({gamma},{pi}{sup +}) reaction in nuclei starting from the {gamma}{ital N}{r_arrow}{pi}{pi}{ital N} amplitude on one nucleon and allowing one of the pions to be produced off shell and be absorbed by a second nucleon. Detailed calculations are presented for the {gamma} {sup 3}He{r_arrow}{pi}{sup +}{sup 3}H reaction, where we show that the cross section at large momentum transfers is dominated by these mechanisms, helping improve the agreement with experimental data. It is also shown that the meson exchange currents produce important effects in the photon asymmetry in the {Delta}-resonance region. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 397710
- Journal Information:
- Physical Review, C, Vol. 54, Issue 6; Other Information: PBD: Dec 1996
- Country of Publication:
- United States
- Language:
- English
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