Eur. Phys. J. A 10, 69-71

Fission probabilities across the -nucleon delta resonance

R.J. Peterson¹, S. de Barros², H. Schechter², S.G. Mashnik³, A.G. daSilva⁴ and J.C. Suita<sup>4

1</sup>  Nuclear Physics Laboratory, University of Colorado, Boulder Co 80309-0446, USA
²  Instituto de Fisica, Universidade Federal do Rio de Janeiro, Cx. Postal 68.528, Rio de Janeiro, Brazil
³  T2 Los Alamos National Laboratory, Los Alamos, NM 87545, USA
⁴  Instituto de Engenharia Nuclear, Cx Postal 68550, Rio de Janeiro, Brazil

peterson@spectr.colorado.edu

(Received: 15 August 2000 / Revised version: 22 January 2000 Communicated by M. Garçon)

Abstract
Cross-sections for the -induced fission of ²⁰⁹Bi and ²³⁵U have been measured in small steps across the 3-3 resonance to search for any mechanisms that might signal a change in the reaction mechanism across a region where strong coupling of available energy into nuclear excitation can be expected. The bismuth data are found to be in good agreement with a statistical calculation not including new mechanisms.

PACS
25.80.Hp - Pion-induced reactions.
24.60.Dr - Statistical Compound-nucleus reactions.

© Società Italiana di Fisica, Springer-Verlag 2001