Lambda hyperons produced in central nucleus-nucleus interactions at 4.5 GeV/c momentum per incident nucleon

Transverse momenta and rapidities of Lambda 's produced in central nucleus-nucleus collisions at 4.5 GeV/c·u (C-C,...,O-Pb) were studied and compared with those from inelastic He-Li interactions at the same incident momentum. Polarization of the Lambda hyperons was found to be consistent with zero ( alpha P=-0.06=0.11 for Lambda 's from central collisions). An upper limit of the Lambda -bar / Lambda production ratio was estimated to be less than 4.5 x 10-3. The experiment was performed in a triggered streamer chamber

The methodics of the identification of pi /sup -/p elastic interactions in bubble chamber

A method for elastic events separation from the prong-events in a hydrogen bubble chamber exposed to pi /sup -/ meson beams is presented. It is argued that for elastic events the simultaneous cuts in the angle of coplanarity and the angular kinematical correlation are less sensitive to the experimental errors than in other kinematical correlations. The proposed methodics is compared with other current techniques for elastic events identification. The method for elastic events separation has been tested on a sample of two prong-events from the CERN 2 m H/sub 2/ bubble chamber exposed to a beam of 16 GeV/c pi /sup -/ mesons. The processing of elastic events candidates is presented too. (36 refs)

Staging of portal hypertension and portosystemic shunts using dynamic nuclear medicine investigations

AIM: To explore portal hypertension and portosystemic shunts and to stage chronic liver disease (CLD) based on the pathophysiology of portal hemodynamics