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Title: Central collisions of heavy ions. Progress report, October 1, 1991--September 31, 1992

Abstract

This report describes the activities of the Heavy Ion Physics Group at the University of California, Riverside from October 1, 1991 to September 30, 1992. During this period, the program focused on particle production at AGS energies, and correlation studies at the Bevalac in nucleus-nucleus central collisions. As part of the PHENIX collaboration, contributions were made to the Preliminary Conceptual Design Report (pCDR), and work on a RHIC silicon microstrip detector R&D project was performed.

Authors:
Publication Date:
Research Org.:
California Univ., Riverside, CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10110016
Report Number(s):
DOE/ER/40271-T3
ON: DE93006065
DOE Contract Number:
FG03-86ER40271
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Oct 1992
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; HEAVY ION REACTIONS; PARTICLE PRODUCTION; PROGRESS REPORT; GEV RANGE; STRANGE PARTICLES; RADIATION DETECTORS; 663450; HEAVY-ION-INDUCED REACTIONS AND SCATTERING

Citation Formats

Fung, Sun-yiu. Central collisions of heavy ions. Progress report, October 1, 1991--September 31, 1992. United States: N. p., 1992. Web. doi:10.2172/10110016.
Fung, Sun-yiu. Central collisions of heavy ions. Progress report, October 1, 1991--September 31, 1992. United States. doi:10.2172/10110016.
Fung, Sun-yiu. Thu . "Central collisions of heavy ions. Progress report, October 1, 1991--September 31, 1992". United States. doi:10.2172/10110016. https://www.osti.gov/servlets/purl/10110016.
@article{osti_10110016,
title = {Central collisions of heavy ions. Progress report, October 1, 1991--September 31, 1992},
author = {Fung, Sun-yiu},
abstractNote = {This report describes the activities of the Heavy Ion Physics Group at the University of California, Riverside from October 1, 1991 to September 30, 1992. During this period, the program focused on particle production at AGS energies, and correlation studies at the Bevalac in nucleus-nucleus central collisions. As part of the PHENIX collaboration, contributions were made to the Preliminary Conceptual Design Report (pCDR), and work on a RHIC silicon microstrip detector R&D project was performed.},
doi = {10.2172/10110016},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Oct 01 00:00:00 EDT 1992},
month = {Thu Oct 01 00:00:00 EDT 1992}
}

Technical Report:

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  • This report describes the activities of the Heavy Ion Physics Group at the University of California, Riverside from October 1, 1990 to September 30, 1991. During this period, our program focuses on particle production at AGS energies, and correlation studies at the Bevalac in nucleus central collisions. We participated in the preparation of letters of intent for two RHIC experiments -- the OASIS proposal and the Di-Muon proposal -- and worked on two RHIC R&D efforts -- a silicon strip detector project and a muon-identifier project. A small fraction of time was also devoted to physics programs outside the realmmore » of heavy ion reactions by several individuals.« less
  • This report describes the activities of the Heavy Ion Physics Group at the University of California, Riverside from October 1, 1992 to August 31, 1993. During this period, our AGS E802/E859/E866 experiments focused on strange particle production, and the fluctuation phenomenon associated with correlation studies in nucleus nucleus central collisions. We have designed and are implementing a new detector to replace the Target Multiplicity Array (TMA) for the E866 runs. As part of the PHENIX collaboration, we contributed to the Conceptual Design Report (CDR), and worked on a RHIC silicon microstrip detector R&D project, the central core of the multiplicity-vertexmore » detector (MVD). In the coming year, we planned to complete the New Multiplicity Array (NMA) detector for the gold projectile E866 experiment, and analyzed the data associated with this new system. We are continuing our efforts in the preparation of the PHENIX detector system.« less
  • The High Energy Physics Group has been principally involved with Fermilab experiments on photoproduction and hadroproduction of charm. Nuclear reactions with a mixed 250-GeV hadronic beam and 500-GeV {pi}-N interactions were used. Considerable attention is devoted to the UNIX/RISC computing farm. The Group also has an SSC R&D program dealing with the adaptation and use of the HETC-based detector simulation code CALOR89, the development of liquid scintillator technology for use in SSC detector calorimeters, the hanging file calorimeter project, and the calorimetry program for GEM.
  • This program was established for the purpose of studying projectile fragmentation; (1) as a function of energy, focusing first on the intermediate energy region, < 1 GeV/nucleon, where there have been few previous measurements and no systematic studies, and (2) as a function of projectile mass, starting with light beams and proceeding to species as heavy as nickel (and possibly beyond). The intermediate energy region is important as the transition between the lower energy data, where the interaction appears to be dominated by collective effects and the decay of excited nuclei, and the highest energy results, where nucleon-nucleon interactions aremore » fundamental, ``limiting fragmentation`` applies, and the nucleus may well break-up before any de-excitation. The mass dependence of projectile fragmentation is largely unknown since most detailed work has involved light ion beams. Nuclear structure effects, for example, may well be quite prominent for heavier beams. Furthermore, the nuclear excitation functions for the production of different fragment isotopes have immediate application to the astrophysical interpretation of existing isotopic datasets obtained from balloon and satellite measurements of galactic cosmic rays.« less
  • This Technical Progress Report describes the progress made on the research objectives during the past twelve months. This research project is designed to provide measurements of various scattering processes which occur in H{sup {minus}} collisions with atomic (specifically, noble gas and atomic hydrogen) targets at intermediate energies. These processes include: elastic scattering,single- and double-electron detachment, and target excitation/ionization. For the elastic and target inelastic processes where H{sup {minus}} is scattered intact, the experimental technique of Ion Energy-Loss Spectroscopy (IELS) will be employed to identify the final target state(s). In most of the above processes, cross sections are unknown both experimentallymore » and theoretically. The measurements in progress will provide either experimentally-determined cross sections or set upper limits to those cross sections. In either case, these measurements will be stringent tests of our understanding in energetic negative ion-atom collisions. This series of experiments required the construction of a new facility and the initial ion beam was accelerated through the apparatus in April 1991.« less