NASA Scientific and Technical Aerospace Reports

2s(sup 2)2p(sup 3)3p, and 2s(sup 2)2p(sup 3)3d giving rise to 86 fine-structure levels in intermediate coupling. Collision
strengths are calculated at five incident energies, 5.2, 10, 15, 20 and 25 Ry. Excitation rate coefficients are calculated as a
function of electron temperature by assuming a Maxwellian electron velocity distribution. Using the excitation rate coefficients
and the radiative transition rates, statistical equilibrium equations for level populations are solved at electron densities
covering the range of 10(exp 8) - 10(exp 14)/cc at an electron temperature of logTe/K = 5.0, corresponding to maximum
abundance of Ne III. Relative spectral line intensities are calculated.
Author
Atoms; Line Spectra; Nitrogen Isotopes; Electron Impact; Collisions; Energy Levels
73
NUCLEAR PHYSICS
Includes nuclear particles; and reactor theory. For space radiation see 93 Space Radiation. For atomic and molecular physics see 72
Atomic and Molecular Physics. For elementary particle physics see 77 Physics of Elementary Particles and Fields. For nuclear
astrophysics see 90 Astrophysics.
20040070967 Lawrence Livermore National Lab., Livermore, CA
Fundamental Nucleon-Nucleon Interaction: Probing Exotic Nuclear Structure using GEANIE at LANSCE/WNR
Lee, R. W.; Feb. 25, 2000; 22 pp.; In English
Report No.(s): DE2004-15006435; UCRL-ID-137793; No Copyright; Avail: Department of Energy Information Bridge
No abstract available
Nucleon-Nucleon Interactions; Nuclear Structure
20040071089 Oak Ridge National Lab., TN
Method for Concurrent and Continuous Measurement of Rn-222 and Rn-220 Using Scintillation Cells
Coleman, R. L.; 2003; In English
Report No.(s): DE2003-814040; ORNL/TM-2002/37; No Copyright; Avail: National Technical Information Service (NTIS)
A method is described for the continuous and simultaneous measurement of both (sup 220)Rn and (sup 222)Rn in air. Two
scintillation flasks are arranged in a serial configuration and the concentrations of (sup 222)Rn and (sup 220)Rn are determined
by making use of the difference between the half-lives of the two radon isotopes. The method was developed for directly
measuring (sup 220)Rn in occupied areas where fuel materials containing (sup 228)Th were being used, but could also be
useful for other applications. Since (sup 222)Rn is usually present from either naturally occurring materials or due to the
presence of process material, the method was designed to allow measurement of the two isotopes at coincident times.
NTIS
Calibrating; Scintillation Counters; Radon Isotopes
74
OPTICS
Includes light phenomena and the theory of optical devices; for specific optical devices see also 35 Instrumentation and Photography.
For lasers see 36 Lasers and Masers.
20040068194 National Inst. of Standards and Technology, USA
Novel Electrically Substituted Optical Detectors
Rice, Joseph; Lorentz, Steven; Houston, Jeanne; International Thermal Detectors Workshop (TDW 2003); February 2004,
pp. 2-14; In English; See also 20040068186; No Copyright; Abstract Only; Available from CASI only as part of the entire
parent document
Several new thermal-type optical detectors have been developed at NIST for various measurement applications over the
past few years. These detectors share a common feature in that they incorporate a form of electrical substitution where
chopper-synchronized electrical power, controlled by a servo loop, maintains the detector at a fixed operating temperature.
This mode of operation increases temporal stability, improves time response, and provides a relatively straightforward basis
for calibration. While related to operating modes utilizing electro-thermal feedback, electrical substitution is quite distinct, as
will be shown. We will present a general introduction to electrically substituted thermal-type optical detectors, and then
provide specific details on up to four new examples: 1) An electrically substituted liquid helium cooled bolometer (ESB) that
250