Other
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt........51p&link_type=abstract
Thesis (PH.D.)--MASSACHUSETTS INSTITUTE OF TECHNOLOGY, 1992.Source: Dissertation Abstracts International, Volume: 53-06, Secti
Other
6
Scientific paper
Proton and silicon projectiles at 14.6 GeV/A have been collided against beryllium, aluminum, copper, and gold targets. Full particle identification for produced charged particles emitted with lab angles between 5 ^circ and 50^circ and momentum between 0.5 GeV/c and 2.2 GeV/c has been obtained. Significant errors in previously published results have been found and corrected. Integrated yields particularly for pions and forward rapidity protons are larger by as much as 50%. For central events the average projectile baryon stopping was determined. The average rapidity loss of the projectile baryon is 0.85 +/- 0.1, 1.35 +/- 0.1, 1.50 +/- 0.28, 1.66 +/- 0.21, 1.88 +/- 0.17 and 2.11 +/- 0.13 for Si + Al, Si + Au, p + Be, p + Al, p + Cu and p + Au respectively. For heavy targets, many small deviations from exponential M_{|} dependence of the differential cross-sections are found. Protons are suppressed at low P_{| } and pions are enhanced relative to a simple exponential in M_{|} . This is ascribed to Fermi-Bose effects, and the enhancement is used in to determine the energy and number densities of the colliding system. For Si + Au central events pion densities of approximately 0.1 fm^ {-3} for each species, or ~ 0.3 fm^{-3} over all, are found if thermalization of the pions is assumed. This density corresponds to a hard sphere radius of 4 to 4.5 fm, in good agreement with pion and proton interferometry measurements on the same system. Levels of strangeness two times higher than found in other experiments with lower Z target and projectile nuclei have been found. The analysis suggests that fermi inhibition caused by the high densities plays a role, though the data are not conclusive. (Copies available exclusively from MIT Libraries, Rm. 14-0551, Cambridge, MA 02139-4307. Ph. 617 -253-5668; Fax 617-253-1690.).
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