27 research outputs found
A Photodiode/CsI Phoswich Detector
This research was sponsored by the National Science Foundation Grant NSF PHY-931478
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Performance evaluation of a commercially available heat flow calorimeter and applicability assessment for safeguarding special nuclear materials
The performance characteristics of a commercially available heat-flow calorimeter will be presented. The heat-flow sensors within the calorimeter are based on thermopile technology with a vendor-quoted sensitivity of 150 {micro}V/mW. The calorimeter is a full-twin design to compensate for ambient temperature fluctuations. The efficacy of temperature fluctuation compensations will also be detailed. Finally, an assessment of design applicability to special nuclear materials control and accountability and safeguarding will be presented
Calculations of Isotopic IMF Yields in the 4-He + 116,124-Sn Reaction
This research was sponsored by the National Science Foundation Grant NSF PHY-931478
ISiS: The Indiana Silicon Sphere
This research was sponsored by the National Science Foundation Grant NSF PHY-931478
Time Scales and Dynamics of 3-He-Induced Multifragmentation
This research was sponsored by the National Science Foundation Grant NSF PHY-931478
First Tests of the Indiana Silicon Sphere (ISiS)
This research was sponsored by the National Science Foundation Grant NSF PHY-931478
The model for self-dual chiral bosons as a Hodge theory
We consider (1+1) dimensional theory for a single self-dual chiral boson as
classical model for gauge theory. Using Batalin-Fradkin-Vilkovisky (BFV)
technique the nilpotent BRST and anti BRST symmetry transformations for this
theory have been studied. In this model other forms of nilpotent symmetry
transformations like co-BRST and anti co-BRST which leave the gauge-fixing part
of the action invariant, are also explored. We show that the nilpotent charges
for these symmetry transformations satisfy the algebra of de Rham cohomological
operators in differential geometry. The Hodge decomposition theorem on compact
manifold is also studied in the context of conserved charges.Comment: 19 pages, No figures, Revtex, Final version to appear in EPJ
Light-Ion-Induced Multifragmentation: The ISiS Project
An extensive study of GeV light-ion-induced multifragmentation and its
possible interpretation in terms of a nuclear liquid-gas phase transition has
been performed with the Indiana Silicon Sphere (ISiS)4 pi detector array.
Measurements were performed with 5-15 GeV/c p, pbar, and pion beams incident on
Au and 2-5 GeV He incident on Ag and Au targets.
Both the reaction dynamics and the subsequent decay of the heavy residues have
been explored. The data provide evidence for a dramatic change in the reaction
observables near an excitation energy of E*/A = 4-5 MeV per residue nucleon. In
this region, fragment multiplicities and energy spectra indicate emission from
an expanded/dilute source on a very short time scale (20-50 fm/c). These
properties, along with caloric curve and scaling-law behavior, yield a pattern
that is consistent with a nuclear liquid-gas phase transition.Comment: 67 pages, 44 figures, all included in tar fil