Compression, expansion, and freeze-out in nucleus-nucleus collisions at the AGS
Conference
·
OSTI ID:10125954
- State Univ. of New York, Stony Brook, NY (United States). Dept. of Physics
In the following we will present selected aspects of recent data on central nucleus-nucleus collisions taken by the E814/E877 collaboration at the BNL-AGS. We will first demonstrate that stopping is nearly complete in these collisions, and discuss the initial energy and baryon densities inferred from model comparisons with the data. Next we will discuss the amount of expansion the system undergoes from the initial phase until freeze-out by presenting recent results on pion-pion correlations. The (baryonic) resonance composition of the system at freeze-out is obtained by analyzing pion spectra at low transverse momentum p{sub t} and by inspection of direct measurements of the {Delta}(1232) resonance. Based on analysis of these measurements we will then discuss a ``local`` freeze-out scenario, where the freeze-out volume is connected with the temperature averaged pion-nucleon cross section. A summary of the current results and of future plans for Au-Au collisions with the E877 apparatus concludes the paper. The data presented were obtained for central 14.6 A GeV/c Si + Al and Si + Pb collisions and 11.4 A GeV/c Au+Au collisions. The forward spectrometer covers in one fixed setting an angular range in the magnet bend plane of {minus}115 < {theta}{sub x} < 14 mr and {minus}21 < {theta}{sub y} < 21 mr perpendicular to it. Centrality is selected by measuring associated charged particle multiplicity and/or transverse energy.
- Research Organization:
- Brookhaven National Lab., Upton, NY (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 10125954
- Report Number(s):
- BNL--49938; CONF-930999--7; ON: DE94007162
- Country of Publication:
- United States
- Language:
- English
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