Investigation of low energy pion-nucleus interaction using electrofission data for heavy nuclei at the pion threshold
A. Deppman1 - J.D.T. Arruda-Neto2
1 Laboratori Nazionali di Frascati, Istituto Nazionale di Física
Nucleare, P.O. Box 13, I-00044 Frascati (Roma), Italy
2 Universidade de Santo Amaro/UNISA, São Paulo, Brasil
Received: 10 March 1998 / Revised version: 12 March 1999 Communicated by C. Signorini
Abstract
A theoretical approach to describe electro- and photofission processes
at intermediate energies was worked out. Photopion reabsorption
mechanisms by two and three nucleons (
and 
) were
incorporated in the calculations. The comparison with electrofission
data for preactinides showed that a substantial 3NA component should
be added in the pion absorption to fit the data near photopion
threshold, in accordance with a recent theoretical estimate. It was
also shown that the shape of the fission response curve is sensitive
to detailed aspects of the pion mean free path.
PACS
25.20.Lj Photoproduction reactions -
25.85.Jg Photofission
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