K+ and π+ multiplicities have been measured in magnetic spectrometer for Si++ Al, Si+ Cu and Si + Au collisions at 14.6 A GeV/c incident momentum. The multiplicities were obtained for five different windows of forward kinetic energy as detected in a zero degree calorimeter. The K+/π+ multiplicity ratio ranges from ≈9% in peripheral interactions to 19% in central Si+Au. The largest K+ / π+ ratios are observed for those events for each target that leave the least energy in the zero degree calorimeter and the ratio increases with target mass. The observations suggest that multiple interactions are important in the particle production mechanism.
Bibliographical noteFunding Information:
We gratefully acknowledge the expert assistance from the Brookhaven Tandem and AGS operating staffs both in providing the Si beams and in supporting the experiment. This work has been supported by the US Department of Energy under contracts with ANL (W-31-109-ENG-38), BNL (DE-AC02-76CH00016), Columbia University (DE-FG02-86-ER40281), LLNL (W-7405-ENG-48), MIT (DE-AC02-76ER03069), UC Riverside (DE-FG03-86ER40271 ) and by NASA (NGR-05-003-513), under contract with the University of California, and by the US-Japan High Energy Physics Collaboration Treaty.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics