A Photodiode/CsI Phoswich Detector

This research was sponsored by the National Science Foundation Grant NSF PHY-931478

The development of a virtual heat bath for calorimeters

All existing calorimeter systems for sensitive nuclear assay employ a heat bath surrounding the sample chamber. The purpose of the heat bath is to maintain a constant temperature so that a fixed temperature difference is maintained across the thermal resistance of the calorimeter. Present calorimeter systems all employ an active, feedback-controlled system to maintain a fixed temperature. An alternative would be to allow the heat-bath temperature to change, to measure it, and to compensate the assay for this change. Two significant observations make this approach possible: (1) the effect on the measurement of a temperature change in the heat bath is differential in form and (2) temperature measurement systems are very accurate when measuring differences in temperature (either in time or between two locations). From these observations, the authors have developed a virtual heat-bath compensation system. The control theory and results will be presented

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

Isotopic Yields of Intermediate-Mass Fragments Emitted in E/A = 50 MeV 4-He + 116,124-Sn Reactions

This research was sponsored by the National Science Foundation Grant NSF PHY-931478

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

Multifragmentation in the 1.8 - 4.8 GeV 3-He + nat-Ag, 197-Au Reactions

This research was sponsored by the National Science Foundation Grant NSF PHY-931478

ISiS: A 4pi Detector System for Complex Fragments

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