12 research outputs found
Magnetic enhancement of CoZnFeO spinel oxide by mechanical milling
We report the magnetic properties of mechanically milled
CoZnFeO spinel oxide. After 24 hours milling of the
bulk sample, the XRD spectra show nanostructure with average particle size
20 nm. The as milled sample shows an enhancement in magnetization and
ordering temperature compared to the bulk sample. If the as milled sample is
annealed at different temperatures for the same duration, recrystallization
process occurs and approaches to the bulk structure on increasing the annealing
temperatures. The magnetization of the annealed samples first increases and
then decreases. At higher annealing temperature ( 1000C) the system
shows two coexisting magnetic phases {\it i.e.}, spin glass state and
ferrimagnetic state, similar to the as prepared bulk sample. The room
temperature M\"{o}ssbauer spectra of the as milled sample, annealed at
300C for different durations (upto 575 hours), suggest that the observed
change in magnetic behaviour is strongly related with cations redistribution
between tetrahedral (A) and octahedral (O) sites in the spinel structure. Apart
from the cation redistribution, we suggest that the enhancement of
magnetization and ordering temperature is related with the reduction of B site
spin canting and increase of strain induced anisotropic energy during
mechanical milling.Comment: 14 pages LaTeX, 10 ps figure
The PHENIX Experiment at RHIC
The physics emphases of the PHENIX collaboration and the design and current
status of the PHENIX detector are discussed. The plan of the collaboration for
making the most effective use of the available luminosity in the first years of
RHIC operation is also presented.Comment: 5 pages, 1 figure. Further details of the PHENIX physics program
available at http://www.rhic.bnl.gov/phenix
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Research in Heavy Ion Nuclear Reactions
This is the final progress report for the experimental nuclear physics program at Georgia State University (GSU) under the leadership of Gus Petitt. In June, 1996, Professor Petitt retired for health reasons and the DOE contract was extended for another year to enable the group to continue it's work. This year has been a productive one. The group has been heavily involved in the E866 experiment at Fermilab where we have taken on the responsibility of developing a new level-3 trigger for the experiment. Bill Lee, the graduate student in our group expects to obtain his thesis data from the run extension currently in progress, which focuses on the A dependence of J/{psi}'s and {Upsilon}'s from beryllium, tungsten, and iron targets. In the past year and a half the GSU group has led the development of a new level-3 software trigger system for E866. Our work on this project is described
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Progress Report for 1995-1996
We have been involved in several projects during the present contract period. These include completion of our work on the RD94 test runs performed at the Alternating Gradient Synchrotron (AGS) at Brookhaven; the PhD. thesis project of Ziyang Zhang which was completed during the year, was based on this work. We have continued our Monte Carlo simulation work. This includes studies of trigger rates in the muon identifier of the PHENIX experiment for RHIC. In addition to this we have continued our involvement in developing upgrades for the PISA and PISORP simulation codes for PHENIX. We are most heavily involved in work on the E866 experiment at Fermilab. GSU has taken on the task of modifying the trigger system for this experiment. A third level trigger based on digital signal processors (DSP`s) mounted on a VME bus is being developed for this. We feel that this project will be a valuable training ground for our work on PHENIX. We expect that the expertise that we acquire in development of the Level-3 trigger system for E866 will enable us to contribute significantly to development of the PHENIX trigger and online event processing system, especially for the PHENIX Muon Arms. These projects are discussed in detail in the following pages