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Pion correlations as a function of atomic mass in heavy ion collisions

Technical Report ·
DOI:https://doi.org/10.2172/5091759· OSTI ID:5091759
The method of two pion interferometry was used to obtain source-size and lifetime parameters for the pions produced in heavy ion collisions. The systems used were 1.70 {center dot} A GeV {sup 56}Fe + Fe, 1.82 {center dot} A GeV {sup 40}Ar + KCl and 1.54 {center dot} A GeV {sup 93}Nb + Nb, allowing for a search for dependences on the atomic number. Two acceptances (centered, in the lab., at {approximately} 0{degrees} and 45{degrees}) were used for each system, allowing a search for dependences on the viewing angle. The correlation functions were calculated by comparing the data samples to background (or reference) samples made using the method of event mixing, where pions from different events are combined to produce a data sample in which the Bose-Einstein correlation effect is absent. The effect of the correlation function on the background samples is calculated, and a method for weighting the events to remove the residual correlation effect is presented. The effect of the spectrometer design on the measured correlation functions is discussed, as are methods for correcting for these effects during the data analysis. 58 refs., 39 figs., 18 tabs.
Research Organization:
Lawrence Berkeley Lab., CA (USA)
Sponsoring Organization:
DOE/ER
DOE Contract Number:
AC03-76SF00098; FG03-87ER40323
OSTI ID:
5091759
Report Number(s):
LBL-28149; ON: DE90006086
Country of Publication:
United States
Language:
English

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Related Subjects

651520* -- Nuclear Properties & Reactions
A=39-58
Experimental
651620 -- Nuclear Properties & Reactions
A=59-89
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL COMPOUNDS
ARGON 40 REACTIONS
BOSONS
CHARGED-PARTICLE REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CORRELATION FUNCTIONS
ELEMENTARY PARTICLES
ELEMENTS
FUNCTIONS
HADRONS
HALIDES
HALOGEN COMPOUNDS
HEAVY ION REACTIONS
IRON
IRON 56 REACTIONS
MASS NUMBER
MESONS
METALS
NIOBIUM
NIOBIUM 93 REACTIONS
NUCLEAR REACTIONS
PARTICLE IDENTIFICATION
PIONS
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
PSEUDOSCALAR MESONS
TRANSITION ELEMENTS