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Jahn-Teller splitting and Zeeman effect of acceptors in diamond.

Description: Employing the high resolution of a 5+4 tandem Fabry-Perot interferometer, we discovered that {Delta}{prime}, the Raman active electronic transition between the spin-orbit split 1s(p{sub 3/2}): {Lambda}{sub 8} and 1s(P{sub 1/2}) {Lambda}{sub 7} acceptor ground states, is a doublet for a boron impurity in diamond with a clearly resolved spacing of 0.81 {+-} 0.15 cm{sup {minus}1}. The direct observation of a Stokes/anti-Stokes pair with 0.80 {+-} 0.04 cm{sup {minus}1} shift provides a striking confirmation that the lower 1s(p{sub 3/2}): {Lambda}{sub 8} ground state has experienced a splitting due to a static Jahn-Teller distortion. The Zeeman effect of {Delta}{prime} has been investigated with a magnetic field along several crystallographic directions. Theory of the Zeeman effect, formulated in terms of the symmetry of the substitutional acceptor and the Luttinger parameters of the valence band, allows quantitative predictions of the relative intensities of the Zeeman components in full agreement with experiments. The observation of transitions within the {Lambda}{sub 8} Zeeman multiplet, i.e., the Raman-electron-paramagnetic-resonances, is yet another novel feature to emerge from the present study. The investigation has also yielded g-factors characterizing the Zeeman multiplets.
Date: September 11, 1999
Creator: Anthony, T. R.; Grimsditch, M.; Kim, H.; Ramdas, A. K. & Rodriguez, S.
Partner: UNT Libraries Government Documents Department

Best-estimate Mark 22 power and temperature limits during the flow instability phase of K Reactor LBLOCAs

Description: Los Alamos National Laboratory (LANL) has been providing independent analyses to the Department of Energy in its endeavor to enhance the safe operation of the K Reactor located at the Savannah River Laboratory (SRL). LANL has performed neutronic and thermal-hydraulic system simulations to assess the impact of hypothesized accidents in the K Reactor. In particular, the large-break loss-of-coolant accident (LBLOCA) was one of the major transients that was analyzed. The LBLOCA consists of two distinct thermal-hydraulic phases: the flow instability (FI) phase and the emergency coolant system (ECS) phase. Each phase results in reactor temperature and power limits that are determined using different criteria. This document provides a detailed discussion of the simulations of these phases.
Date: January 1, 1992
Creator: Rodriguez, S.; Steiner, J.; Motley, F. & Morgan, M.
Partner: UNT Libraries Government Documents Department

Radiological characterization of the TAN-IET facility

Description: The Initial Engine Test (IET) facility is located on the Idaho National Engineering Laboratory (INEL) site at the north end of Test Area North (TAN). The IET facility was constructed and used for the Aircraft Nuclear Propulsion Program during the 1950's and was later used for two other programs: the Space Nuclear Auxiliary Power Transient (SNAP-TRAN) and the Hallam Decontamination and Decommissioning Project. The facility is no longer in use, therefore, a complete radiological characterization was conducted at the IET site. The characterization included measurements of beta-gamma dose rates; beta-gamma and alpha surface contamination; concentrations of selected radionuclides in subsurface storage tanks, surface soil, the exhaust duct, stack and test pad; and a walk-over surface survey of the entire facility. The information contained in this report will be of great value as the IET facility goes through the decommissioning and decontamination process.
Date: June 1, 1982
Creator: Koeppen, L.D.; Rodriguez, S.V.; Wheeler, O.A.; Cadwell, E.D. & Simpson, O.D.
Partner: UNT Libraries Government Documents Department

Best-estimate Mark 22 power and temperature limits during the flow instability phase of K Reactor LBLOCAs

Description: Los Alamos National Laboratory (LANL) has been providing independent analyses to the Department of Energy in its endeavor to enhance the safe operation of the K Reactor located at the Savannah River Laboratory (SRL). LANL has performed neutronic and thermal-hydraulic system simulations to assess the impact of hypothesized accidents in the K Reactor. In particular, the large-break loss-of-coolant accident (LBLOCA) was one of the major transients that was analyzed. The LBLOCA consists of two distinct thermal-hydraulic phases: the flow instability (FI) phase and the emergency coolant system (ECS) phase. Each phase results in reactor temperature and power limits that are determined using different criteria. This document provides a detailed discussion of the simulations of these phases.
Date: March 1, 1992
Creator: Rodriguez, S.; Steiner, J.; Motley, F. & Morgan, M.
Partner: UNT Libraries Government Documents Department

Monitoring and data analysis for the Vadose Zone Monitoring System (VZMS), McClellan AFB. Quarterly status report, August 15, 1997--November 15, 1997

Description: This report contains information on field and laboratory work performed between August 15th and November 15th at site S-7 in IC 34, at McClellan AFB. At this location, a Vadose Zone Monitoring System (VZMS) (LBNL, 1996) is currently being used to collect subsurface data including hydraulic potential, soil gas pressure, moisture content, water chemistry, gas chemistry, and temperature.
Date: December 5, 1997
Creator: Zawislanski, P.T.; Mountford, H.S.; Dahlquist, R.; Rodriguez, S.J. & Salve, R.
Partner: UNT Libraries Government Documents Department

Monitoring and Data Analysis for the Vadose Zone Monitoring System (VZMS), McClellan AFB. Quarterly Status Report (2/20/98 - 5/20/98)

Description: This report contains information on field and laboratory work performed between February 20th, 1998 and May 20th, 1998, at site S-7 in IC 34, at McClellan AFB. At this location, a Vadose Zone Monitoring System (VZMS) (LBNL, 1996) is currently being used to collect subsurface data including hydraulic potential, soil gas pressure, moisture content, water chemistry, gas chemistry, and temperature. This report describes: moisture content changes, based on neutron logging; gas-phase VOC concentrations; aqueous-phase VOC concentrations; temperature profiles; and installation of new instrument cluster.
Date: June 18, 1998
Creator: Zawislanski, P.T.; Mountford, H.S.Monitoring and Data Analysis; System, for the Vadose Zone Monitoring; Mountford, H.S.; Dahlquist, R. & Rodriguez, S.J.
Partner: UNT Libraries Government Documents Department