Inclusive protonlike production cross sections from 0. 757 GeV/nucleon La+La collisions

Large discrepancies have existed, factor of [similar to]2.5 ([similar to]5[sigma]), between a variety of cascade-type theoretical models and published experimental results for the inclusive protonlike production corss sections at the 20[degree] polar laboratory angle for relativistic La + La collisions. In view of this discrepancy the present work was undertaken to check the experimental cross sections for 0.76 GeV/nucleon La + La collisions using a small-acceptance magnetic spectrometer. The 20[degree] cross sections were determined by measuring the appropriate range of polar laboratory angles and momenta which, when transformed into the projectile frame, produce the cross sections at 20[degree]. Cross sections have been determined from 30[degree] to 75[degree] for protons and light nuclei with rigidities from 0.5 to 2.0 GeV/[ital c] in the laboratory frame. Cross sections were also deduced at 15[degree] and 20[degree] in the projectile frame for nucleon momenta from 0.9 to 1.5GeV/[ital c]. The original experimental results for the larger polar laboratory angles (40[degree] and 60[degree]) were confirmed; however, the 20[degree] cross sections disagree by a factor of about 1.5 ([similar to]2[sigma]). At large polar laboratory angles (40[degree][minus]70[degree]) the model calculations disagrees in the low-momentum range with the present data by a factor of 1.5 ([similar to]3[sigma]). The discrepancy at small polar angles (15[degree] and 20[degree]) has been significantly reduced from the original factor of 2.5 down to a value of 1.2 ([similar to]3[sigma]).