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Investigation of rare particle production in relativistic heavy ion collisions
Crawford, H J ; Engelage, J
Investigation of rare particle production in relativistic heavy ion collisions, 1991
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Título:
Investigation of rare particle production in relativistic heavy ion collisions
Autor:
Crawford, H J
;
Engelage, J
É parte de:
Investigation of rare particle production in relativistic heavy ion collisions, 1991
Notas:
content type line 59
SourceType-Reports-1
ObjectType-Report-1
Descrição:
During FY91 we began our investigation of rare particle production in relativistic nuclear collisions at the Brookhaven National Laboratory. We were funded for a period of one year to perform the initial experimental search, E858, to determine the level of antideuteron ((bar d)) production in Si+Au collisions at the AGS. We accomplished this goal with the discovery of two (bar d)'s in the June 1990 run. We describe an experiment performed and the results obtained. We performed our rare particle search at the A-1 line of the AGS. We instrumented the line with a four time-of-flight (TOF) detectors, two high pressure gas Cerenkox (ck) detectors, and four drift tube (DT) tracking detectors. The TOF detectors achieved time resolution of better than 100ps leading to a mass resolution of less than 15 MeV at 1 GeV. The Ck detectors were used both to suppress the large pi (exp minus) signal and in pi/K separation at high rigidities. The DT system provided particle trajectories for all of the particles passing the trigger requirements. In this experiment we measured the pi (exp minus) K-, and (bar p) momentum spectra at 0(exp o) for rigidities from 2 to 8 GV to a statistical accuracy of 1-3 percent at all settings. We found that the (bar p) yield as a function of target did not show any evidence for reabsorption within the interaction volume. We also found two (bar d)'s, the first observation of complex antinuclei produced in nucleus-nucleus collisions. The (bar d) yield is at least an order of magnitude smaller than prediced using a simple coalescence model based on the d/p ratio from E802 and the (bar p) spectrum measured in our experiment. (DOE)
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