Pion correlations as a function of atomic mass in heavy ion collisions
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 National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC03-76SF00098; FG03-87ER40323
- OSTI ID:
- 5091759
- Report Number(s):
- LBL-28149; ON: DE90006086; TRN: 90-005225
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
IRON
IRON 56 REACTIONS
NIOBIUM
NIOBIUM 93 REACTIONS
PIONS
CORRELATION FUNCTIONS
POTASSIUM CHLORIDES
ARGON 40 REACTIONS
HEAVY ION REACTIONS
MASS NUMBER
PARTICLE IDENTIFICATION
ALKALI METAL COMPOUNDS
BOSONS
CHARGED-PARTICLE REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
ELEMENTARY PARTICLES
ELEMENTS
FUNCTIONS
HADRONS
HALIDES
HALOGEN COMPOUNDS
MESONS
METALS
NUCLEAR REACTIONS
POTASSIUM COMPOUNDS
PSEUDOSCALAR MESONS
TRANSITION ELEMENTS
651520* - Nuclear Properties & Reactions
A=39-58
Experimental
651620 - Nuclear Properties & Reactions
A=59-89
Experimental