488 research outputs found
Equilibrium configurations of tripolar charges
It is shown that an ensemble of particles with tripolar (colour) charges will
necessarily cohere in a hierarchy of structures, from simple clusters and
strings to complex aggregates and cyclic molecule-like structures. The basic
combinatoric rule remains essentially the same on different levels of the
hierarchy, thus leading to a pattern of resemblance between different levels.
The number of primitive charges in each structure is determined by the symmetry
of the combined effective potential of this structure. The outlined scheme can
serve as a framework for building a model of composite fundamental fermions.Comment: 22 pages, 12 figure
Long sandwich modules for photon veto detectors
Long lead-scintillator sandwich modules developed for the BNL experiment
KOPIO are described. The individual 4 m long module consists of 15 layers of 7
mm thick extruded scintillator and 15 layers of 1 mm lead absorber. Readout is
implemented via WLS fibers glued into grooves in a scintillator with 7 mm
spacing and viewed from both ends by the phototubes. Time resolution of 300 ps
for cosmic MIPs was obtained. Light output stability monitored for 2 years
shows no degradation beyond the measurement errors. A 4 m long C-bent sandwich
module was also manufactured and tested.Comment: 14 pages, 13 figures, 1 tabl
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