Pion correlations as a function of atomic mass in heavy ion collisions Page: 11 of 130
Pages: (120 p)View a full description of this report.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
Chapter 1
Introduction
This thesis is a measurement of the size of the pion emitting region in a heavy ion colli-
sion. The measurement was made using intensity interfetometry, which is based on the
interference of identical particles due to the Bose-Einstein symmetrization of the wave
function. The large data sample sizes in this experiment allowed dropping the assumption
that the size of the source measured parallel to the beam is equal to the size of the source
measu-ed perpendicular to the beam. The systems used were 1.82 - A GeV 4OAr + KCI,
1.70 - A GeV "Fe + Fe and 1.54 - A GeV "Nb + Nb,1 allowing comparison of the data
with existing Ar + KCl data[1], and a search for effects depending on the size of the nuclear
system. The identical particles used were negative pions.2 Two different acceptances
were used for each system, centered at 0' (in the laboratory and the nucleus-nucleus
center of mass) and at 45* in the laboratory, which is approximately 90e in the center of
mass, allowing a search for effects depending on the viewing angle. The data samples for
Fe + Fe, Nb + Nb (fe- both acceptances) and for the 0e Ar + Ar, allowed cuts to be
made as a function of pion momentum, allowing a search for effects depending on pion
momentum. Equal mass target and projectile were used for all systems so that the rest
frame of the pion source is the same as the nucleus-nucleus center of mass.
The high statistics available for this experiment made necessary a careful analysis of
the spectrometer's effect on the measured correlation function, and a description of the
' The notation 61.54 - A GeV" is used to demote 154 GeV per nucleon", the total energy of the nucleus
is then 1.54 x A in units of GeV, where A is the atomic number,
2Although pions were used, any identical bosons could be used. An analogous effect exists for Fermi-
Dirac particles.1
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Chacon, A.D. Pion correlations as a function of atomic mass in heavy ion collisions, report, November 26, 1989; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc1055804/m1/11/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.