BREAKUP OF BE-11 - PROMPT OR DELAYED

The disintegration of a secondary beam of Be-11 has been studied in th e Coulomb plus nuclear field of Au and Be targets. The vector momentum (longitudinal and transverse components) was measured with a magnetic spectrograph with sufficient precision to detect previously reported differences in the velocity of the Be-10 fragments and the incident be am. Coincident gamma rays, detected by an array of BaF2 scintillators surrounding the target, were used to identify events in which the targ et was simultaneously excited. No evidence for the previously suggeste d velocity difference was observed.