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Nuclear Chemistry Project. Progress report, Janary 1, 1979-December 31, 1979

Description: The first on-line operation of the Princeton electron spectrometer was achieved and its capability for fast life time measurements demonstrated. The first operation of the heavy ion source was achieved and beams of 75 meV /sup 12/C/sup +4/ ions and 37 MeV /sup 6/Li/sup +2/ ions demonstrated. The capability of the isotope separator to provide pure mass separated samples of radioisotopes is being utilized for three different applications. The very weak electron capture branch of 19-s krypton 81m to bromine 81 was studied. This transition probability is of crucial importance for a possible solar neutrino detection method based on natural bromine. Lead 202 has been prepared and mass separated for optical hyperfine spectroscopic studies. The isotope shift shift which measures the second moment, < r/sup 2/ >, of the nuclear charge indicates the more neutron deficient lead isotopes are becoming increasingly soft toward nuclear deformation.
Date: December 21, 1979
Partner: UNT Libraries Government Documents Department

Radioisotopic composition of yellowcake: an estimation of stack release rates

Description: Uranium concentrate (yellowcake) composites from four mills (Anaconda, Kerr-McGee, Highland, and Uravan) were analyzed for U-238, U-235, U-234, Th-230, Ra-226, and Pb-210. The ratio of specific activities of U-238 to U-234 in the composites suggested that secular radioactive equilibrium exists in the ore. The average activity ratios in the yellowcake were determined to be 2.7 x 10/sup -3/ (Th-230/U-238), 5 x 10/sup -4/ (Ra-226/U-238) and 2 x 10/sup -4/ (Pb-210/U-238). Based on earlier EPA measurements of the release rates from the stacks, the amount of yellowcake released was determined to be 0.1% of the amount processed.
Date: December 1, 1979
Creator: Momeni, M.H.; Kisieleski, W.E.; Rayno, D.R. & Sabau, C.S.
Partner: UNT Libraries Government Documents Department

Study of muonic atoms in the A = 40 - 70 and A = 100 - 130 mass regions (nuclear charge radii, isotope and isotone shifts) and in the Sm-Gd and W-Os-Pt transition regions (electric monopole and quadrupole moments). Progress report, November 15, 1978-December 1, 1979

Description: During the reporting period the muonic x-ray measurements on /sup 106/ /sup 108/ /sup 110/ /sup 111/ /sup 112/ /sup 113/ /sup 114/ /sup 116/Cd and /sup 122/ /sup 124/ /sup 125/ /sup 126/ /sup 128/ /sup 130/Te have been completed and the data were analyzed in terms of effective Barrett charge radii. The muonic x-ray spectra of /sup 154/ /sup 155/ /sup 156/ /sup 157/ /sup 158/Gd have been measured with high precision. Special methods were developed to extract isotopically clean spectra from the measurements with the separated Gd target which contained large amounts of isotopic impurities. The even-A Gd spectra have been analyzed in terms of nuclear monopole and quadrupole parameters and isomer shifts. Additional studies of the nuclear polarization corrections in muonic /sup 208/Pb have been made. The isomer shift of the excited 2/sup +/ state of /sup 204/Pb has been measured: ..delta..E/sub iso/ = 1.98 +- 0.16 keV. The transfer of muons stopped in liquid hydrogen to Au nuclei contained in thin foils (30 ..mu..g/cm/sup 2/) that are suspended in the liquid hydrogen has been observed. About 20 times more muonic Au atoms were produced in this LH/sub 2/-Au arrangement as compared to a solid Au target of the same mass.
Date: December 1, 1979
Creator: Steffen, R M
Partner: UNT Libraries Government Documents Department

Energy savings by means of fuel cell electrodes in electro-chemical industries. Progress report, August 1, 1979-October 31, 1979

Description: Initial efforts in studies of the effects of fuel cell electrodes on energy savings in electrochemical processes have been directed toward assembling test hardware and evaluation of a new zinc plant feed. A complete chemical analysis of the feed is reported. Utilizing the 2'' x 2'' (active electrode area) hardware and techniques developed under Contract No. ET-78-C-02-4881, 6 h zinc electrowinning tests demonstrated a current efficiency of greater than 90% with an energy consumption of 0.54 to 0.55 kWh/lb of zinc. For these tests, 0.1 g/l gelatin was employed as an electrolyte additive and the resultant zinc plates were bright, smooth and compact.
Date: December 12, 1979
Creator: Allen, R.J.; Juda, W. & Lindstrom, R.W.
Partner: UNT Libraries Government Documents Department