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Avian radioecology on a nuclear power station site. Final report

Description: A summary of a six-year avian radioecology study at the site of a nuclear power plant in Massachusetts is reported. A completed historical summary is followed by a description of mathematical models developed to calculate the effects on bird body burdens of various changes in environmental radionuclide levels. Examples are presented. Radionuclide metabolism studies in which acute doses of /sup 131/I and /sup 137/Cs were administered to four species of wild birds are presented. Radionuclides were administered both intravenously and orally; no apparent differences in uptake or elimination rates were observed between the two methods.
Date: January 1, 1975
Creator: Levy, C.K.; Maletskos, C.J. & Youngstrom, K.A.
Partner: UNT Libraries Government Documents Department

Interim report on modeling studies of two-photon isotope separation

Description: The two-photon or two-step dissociation method of laser induced isotope enrichment is being modeled for the HBrNO photochemical system. In the model, H/sup 79/Br is selectively excited by resonance IR laser radiation and then dissociated by uv radiation. Selectively dissociated Br atoms are scavenged to form isotopically enriched BrNO and Br/sub 2/. This model includes all kinetic and absorption processes found to be significant and the time-varying concentrations of any species involved in a significant process. Among these processes are vibrational energy transfer reactions (including isotopic exchange) involving HBr v = 0 - 3, rotational and translational (velocity) relaxation processes, dissociation of HBr in the v = 0 - 3 levels, and secondary chemical reactions of the dissociation products. The absorption and kinetic processes that are most important to /sup 79/Br enrichment have been identified and the study of the effects on enrichment upon variation of external parameters (such as reactant pressure, ir or uv source intensity, and temperature) is in progress. Some preliminary results are: (1) intensity of the ir source is usually more important than the uv intensity; (2) chemical reactions are the dominant kinetic processes at lower pressures while energy transfer reactions dominate at higher pressures; (3) kinetic processes usually have greater effect on the absolute amount of enriched products; (4) isotopic abundance of /sup 79/Br in the products can range from 0.55 to 0.80 for the conditions used in the model.
Date: January 28, 1975
Creator: Hwang, W.C.; Badcock, C.C. & Kamada, R.F.
Partner: UNT Libraries Government Documents Department

Ornithogalum virens as a plant assay for beta and gamma radiation effects

Description: The purpose of this study was to determine if the monocotyledonous angiosperm, Ornithogalum virens (Quintanilha and Cabral, 1947), could be used in such a biological assay system. After exposing O. virens plants to acute (/sup 60/Co) and chronic (/sup 137/Cs) gamma radiation and internal beta radiation (/sup 32/P), lethality (LD/sub 50/, LD/sub 100/), growth inhibition, and chromosome aberrations were investigated. The LD/sub 50/ and LD/sub 100/ for acute gamma radiation were estimated to be between 0.91 to 1.8 krad and less than 3.6 krad, respectively. Though growth inhibition and abnormal growth were observed in the acute and chronic gamma radiation studies, the changes in the growth of the plants were so variable that these parameters were found to be unreliable measures of radiation effects. Chromosome aberrations were a more reliable measure of radiation damage because linear relationships between total aberrations and dose were found for both gamma and beta radiation.
Date: January 1, 1979
Creator: Herron, V J
Partner: UNT Libraries Government Documents Department

Physiological studies of environmental pollutants. Final report, September 1, 1975--March 31, 1978

Description: Physiological studies of environmental pollutants are reported in which a major emphasis is on factors involved in the secretion of these materials into milk. Elements of concern relate to the energy production field, both nuclear and non-nuclear. The distribution of /sup 207/Bi, /sup 203/Pb, /sup 210/Po, and /sup 201/Tl between milk, urine, and feces of lactating goats was determined after oral and intravenous administration. Data is presented showing that these elements are poorly absorbed and in consequence appear in milk in only small amounts. However levels in goats appear to be greater than in cows. Experiments relating to mammary transfer of non-actinide series elements are summarized. Included are observations of significant temperature effects on radioiodine transfer, sites and rates of resorption of iodine, zinc, and calcium from the mammary gland, and the use of radio indicators in determining in vivo milk volume. Experiments with zinc have provided blood level, secretion, and balance data necessary for modeling zinc metabolism in lactating goats. A method is presented for compartmental analysis of models involving a pool of cycling volume such as the mammary gland.
Date: January 1, 1978
Creator: Lengemann, F W & Wentworth, R A
Partner: UNT Libraries Government Documents Department

Metabolism of /sup 90/Sr and other elements in man, April 1, 1976--March 31, 1977 (extended without additional funding to March 31, 1978) and renewal proposal, April 1, 1978--March 31, 1979

Description: Trace element studies of cadmium, copper, zinc, lead, manganese, and nickel were carried out under strictly controlled dietary conditions in adult males during different calcium intakes. Complete metabolic balances of the trace elements listed above were determined in each 6-day metabolic period for several weeks by analyzing the constant diet and the urinary and fecal excretions of these naturally occurring elements, using atomic absorption spectroscopy. Strontium-90 metabolism studies in man were carried out in order to complete previously initiated investigations. Publications and presentations of papers derived from studies carried out during the current contract period are listed.
Date: January 1, 1977
Creator: Spencer, H.
Partner: UNT Libraries Government Documents Department

Nuclear waste management. Quarterly progress report, July--September 1977

Description: Significant research during this period was reported on: decontamination and densification of chop-leach cladding residues; monitoring methods for particulate and gaseous effluents from waste solidification processes; krypton solidification; /sup 14/C and /sup 129/I fixation; waste management studies and safety assessment; waste isolation safety assessment; monitoring and physical characterization of unsaturated zone transport; detection and characterization of mobile organic complexes of fission products; and electropolishing for surface decontamination of metals. (DLC)
Date: January 1, 1978
Creator: Platt, A.M.
Partner: UNT Libraries Government Documents Department

Evaluation of the radionuclide concentrations in soil and plants from the 1975 terrestrial survey of Bikini and Eneu Islands

Description: In June 1975 a radiological survey was conducted of the terrestrial environment of Bikini and Eneu islands (Bikini Atoll) to evaluate the potential radiation dose to the returning Bikini population. In this report, we present measurements of the radionuclide concentration in soil profiles and in dominant species of edible and nonedible, indicator plants. The use of these data to derive relationships to predict the plant uptake of radionuclides from soil is described. Approximately 620 soil and vegetation samples from Bikini and Eneu Islands were analyzed by Ge(Li) gamma spectrometry and by wet chemistry. The predominant radionuclides in these samples were /sup 60/Co, /sup 90/Sr, /sup 137/Cs, /sup 239,240/Pu, /sup 241/Pu, and /sup 241/Am.
Date: January 21, 1977
Creator: Colsher, C.S.; Robison, W.L. & Gudiksen, P.H.
Partner: UNT Libraries Government Documents Department

Workshop on dating old ground water

Description: A workshop on methods which might be used to date very old ground water was held on March 16--18, 1978, in Tucson, Arizona. The workshop was sponsored by the Office of Waste Isolation of Union Carbide Corporation as part of studies supported by the United States Department of Energy which are designed to evaluate the safety of proposed subsurface repositories for nuclear waste. The workshop was convened by the College of Earth Sciences of the University of Arizona with the cooperation of other university departments, particularly the Department of Physics. The dating of ground water in the vicinity of nuclear repositories is a critical aspect of the safety evaluation of these repositories. The age of the water gives an indication of past rates of water movement which in turn will help evaluate the likelihood of future migration of radionuclides from a given repository. Despite this rather obvious practical application, most of the workshop time was devoted to difficult technical questions related to the actual dating of the water.
Date: January 1, 1978
Partner: UNT Libraries Government Documents Department

ENDF/B-V neutron cross section evaluation for the krypton isotopes. [10/sup -5/ eV to 20 MeV]

Description: The evaluation of the neutron cross-section data for the six stable isotopes of Kr from 10/sup -5/ eV to 20 MeV is described. These evaluations incorporate all the new data on these isotopes, including those on the resonance parameters, level schemes of the various isotopes and residual nuclei, and reaction data. Evaluation procedures adopted to assess experimental data and the nuclear model calculations used are described. 67 figures, 6 tables.
Date: January 1, 1979
Creator: Prince, A.
Partner: UNT Libraries Government Documents Department

Level densities in nuclear physics

Description: In the independent-particle model nucleons move independently in a central potential. There is a well-defined set of single- particle orbitals, each nucleon occupies one of these orbitals subject to Fermi statistics, and the total energy of the nucleus is equal to the sum of the energies of the individual nucleons. The basic question is the range of validity of this Fermi gas description and, in particular, the roles of the residual interactions and collective modes. A detailed examination of experimental level densities in light-mass system is given to provide some insight into these questions. Level densities over the first 10 MeV or so in excitation energy as deduced from neutron and proton resonances data and from spectra of low-lying bound levels are discussed. To exhibit some of the salient features of these data comparisons to independent-particle (shell) model calculations are presented. Shell structure is predicted to manifest itself through discontinuities in the single-particle level density at the Fermi energy and through variatons in the occupancy of the valence orbitals. These predictions are examined through combinatorial calculations performed with the Grover (Phys. Rev., 157, 832(1967), 185 1303(1969)) odometer method. Before the discussion of the experimenta results, statistical mechanical level densities for spherical nuclei are reviewed. After consideration of deformed nuclei, the conclusions resulting from this work are drawn. 7 figures, 3 tables. (RWR)
Date: January 1, 1978
Creator: Beckerman, M
Partner: UNT Libraries Government Documents Department

Spontaneous unscheduled DNA synthesis in human lymphocytes

Description: The rate of spontaneous unscheduled DNA synthesis in human lymphocytes was estimated from measurements of tritiated thymidine incorporation into double-stranded DNA (ds-DNA) during incubation of cells in vitro. The contribution of scheduled DNA synthesis to the observed incorporation was reduced by inhibiting replication with hydroxyurea and by separating freshly replicated single-stranded DNA (ss-DNA) from repaired ds-DNA by column chromatography. The residual contribution of scheduled DNA synthesis was estimated by observing effects on thymidine incorporation of: (a) increasing the rate of production of apurinic sites, and alternatively, (b) increasing the number of cells in S-phase. Corrections based on estimates of endogenous pool size were also made. The rate of spontaneous unscheduled DNA synthesis is estimated to be 490 +- 120 thymidine molecules incorporated per cell per hour. These results compare favorably with estimates made from rates of depurination and depyrimidination of DNA, measured in molecular systems if we assume thymidine is incorporated by a short patch mechanism which incorporates an average of four bases per lesion.
Date: January 1, 1979
Creator: Forell, B.; Myers, L.S. Jr. & Norman, A.
Partner: UNT Libraries Government Documents Department

Division of Biological and Medical Research annual report 1978

Description: The research during 1978 in the Division of Biological and Medical Research, Argonne National Laboratory, is summarized. Studies related to nuclear energy include responses of beagles to continuous low-level /sup 60/Co gamma radiation, and development of leukemic indicators; comparison of lifetime effects in mice of low-level neutron and /sup 60/Co gamma radiation; genetic effects of high LET radiations; and metabolic and therapeutic studies of heavy metals. Studies of nonnuclear energy sources deal with characterization and toxicological evaluation of effluents of fluidized bed combustion and coal gasification; electrical storage systems; electric fields associated with energy transmission; and development of population projection models and assessment of human risk. Basic research studies include fundamental structural and biophysical investigations; circadian rhythms; mutagenesis in bacteria and mammalian cells; cell killing, damage, and repair in mammalian cells; carcinogenesis and cocarcinogenesis; the use of liposomes as biological carriers; and studies of environmental influences on life-span, physiological performance, and circadian cycles. In the area of medical development, proteins in urine and tissues of normal and diseased humans are analyzed, and advanced analytical procedures for use of stable isotopes in clinical research and diagnosis are developed and applied. The final sections of the report cover support facilities, educational activities, the seminar program, staff talks, and staff publications.
Date: January 1, 1978
Creator: Rosenthal, M.W. (ed.)
Partner: UNT Libraries Government Documents Department

Molecular mechanisms of the epithelial transport of toxic metal ions, particularly mercury, cadmium, lead, arsenic, zinc, and copper. Progress report, January 1, 1979-December 31, 1979. [Ca; Pb; cockerels]

Description: The mechanism of lead transport is presented, and especially the particular similarities or dissimilarities between lead and calcium in this process. The absorption of these metals was determined cockerels, raised on a commercial diet or on a specified diet, using in vivo ligated loop procedure. The dose administered into the loop contained 0.5 ..mu..Ci /sup 203/Pb (and/or 0.1 ..mu..Ci /sup 47/Ca), and 0.01 mM lead acetate (and/or mM CaCl/sub 2/) in 0.5 ml 0.15 M NaCl,pH 6.5. It was shown that lead is rapidly taken up by the mucosal tissue, and slowly transferred into the body, whereas less calcium is retained by the tissue and the transfer of calcium is many times as effective as that for lead. They appear to respond in a similar manner to a low calcium intake and vitamin D treatment. Increasing luminal stable lead concentration significantly reduced the percentage of radiolead significantly reduced the percentage of radiolead absorbed, but did not affect the absorption of calcium. Also, vitamin D enhanced the transfer of plasma /sup 47/Ca into the lumen but did not affect the transfer of plasma /sup 203/Pb. Intravenous administration of 1,25(OH)/sub 2/CC to rachitic chicks enhanced calcium and lead absorption, but the maximal absorption of these metals occurred at slightly different times after administering this metabolite, indicating that two different transport systems may be involved. It was concluded that lead is transported across the epithelial wall by a passive diffusion and this process is affected by vitamin D in a similar manner as this vitamin affects the diffusional component of calcium transport.
Date: January 1, 1979
Creator: Wasserman, R H
Partner: UNT Libraries Government Documents Department

Molecular mechanisms of the epithelial transport of toxic metal ions, particularly mercury, cadmium, lead, arsenic, zinc, and copper. Progress report, January 1, 1979-December 31, 1979. [3-week-old cockerels]

Description: The purpose of the present studies was to elucidate the mechanism of lead transport, and especially the particular similarities or dissimilarities between lead and calcium in this process. The absorption of these metals was determined in 3-week old White Leghorn cockerels, raised on a commercial diet or on a specified diet, using in vivo ligated loop procedure. The dose administered into the loop contained 0.5 ..mu..Ci /sup 203/Pb (and/or 0.1 ..mu..Ci /sup 47/Ca), and 0.01 mM lead acetate (and/or 1 mM CaCl/sub 2/) in 0.5 ml 0.15 M NaCl,pH 6.5. It was shown that lead is rapidly taken up by the mucosal tissue, and slowly transferred into the body, whereas less calcium is retained by the tissue and the transfer of calcium is many times as effective as that for lead. They appear to respond in a similar manner to a low calcium intake and vitamin D treatment. Certain differences were, however, observed in the absorption process. Increasing luminal stable lead concentration from 0.01 to 1.00 mM Pb, significantly reduced the percentage of radiolead absorbed, but did not affect the absorption of calcium. Also, vitamin D enhanced the transfer of plasma /sup 47/Ca into the lumen but did not affect the transfer of plasma /sup 203/Pb. Intravenous administration of 1,25(OH)/sub 2/CC to rachitic chicks enhanced calcium and lead absorption, but the maximal absorption of these metals occurred at slightly different times after administering this metabolite, and the effect on calcium outlasted that on lead, indicating that two different transport systems may be involved. It was concluded that lead is transported across the epithelial wall by a passive diffusion and this process is affected by vitamin D in a similar manner as this vitamin affects the diffusional component of calcium transport.
Date: January 1, 1979
Creator: Wasserman, R H
Partner: UNT Libraries Government Documents Department

Nuclear chemistry progress report. [Physics Department, Princeton University]

Description: Research in the physics department at Princeton University is reviewed briefly. Results on the Coulomb capture of negative muons by the binary alloy systems Cu/Al and Ag/Zn show that (within experimental error) there is no change in the per atom ..mu../sup -/ capture probability when the atomic ratio in these alloys varies over a range of approximately 40. The K muonic x-ray intensity pattern observed from ..mu.. capture in atmospheric N/sub 2/ was strikingly different from that observed when ..mu.. is captured by N atoms in a condensed phase; this difference was interpreted in terms of differing states of ionization during the capture cascade. The (p,t) reaction was used to study states in /sup 203/Pb, /sup 189/Ir, /sup 191/Ir, and /sup 174/Lu. Triton energy spectra are shown, along with an energy-level diagram of the states deduced in /sup 174/Lu. 13 figures, 6 tables. (RWR)
Date: January 1, 1977
Partner: UNT Libraries Government Documents Department

Nuclear medicine technology. Progress report for quarter ending September 30, 1979

Description: Adrenal uptake in rats of /sup 117m/Sn-labeled 23-(trimethyl stanna)-24-nor-5..cap alpha..-cholan-3..beta..-o1 is demonstrated. The adrenal:blood and adrenal:liver ratios were 33:1 and 9:1, only one day after intravenous administration. A variety of /sup 117m/Sn-labeled steroids with structural modifications were also prepared to determine their effects on the adrenal uptake of these unusual steroids. Structural features required for significant adrenal uptake were determined. The diffusion chamber assay system has been assessed as a means of investigating the toxicity and biological fate of trace elements from energy technologies. In a preliminary experiment, the cell population in chambers from rats exposed to As/sub 2/O/sub 3/ was inhibited 48% one day after treatment. The results of continuing studies with /sup 75/Se, /sup 11/C, and /sup 195m/Pt-labeled agents are also described. Several /sup 75/Se-labeled long-chain fatty acids were prepared to determine heart uptake. Selenium-75-labeled 9-selenapentacosanoic acid showed the highest uptake of the compounds investigated. Preliminary radiation dose estimates have been performed for several /sup 75/Se and /sup 123m/Te-labeled fatty acids. Tissue distribution and excretion data for /sup 75/Se-labeled 9-selenaheptadecanoic acid and /sup 123m/Te-labeled 9-telluraheptadecanoic acid indicate that the human liver would recieve the highest absorbed radiation dose.Tissue distribution studies in rats with a series of /sup 195m/Pt-labeled chloroammine complexes have demonstrated that the tissue distribution and excretion characteristics of the chlorcammine complexes closely parallel their physicochemical properties. Further patient studies have assessed the efficacy of emission computerized tomographic organ imaging with /sup 11/C-valine, and /sup 11/C-amino-cyclobutanecarboxylic acid (ACBC). (ERB)
Date: January 1, 1979
Creator: Knapp, F.F. Jr.
Partner: UNT Libraries Government Documents Department

Study of irradiated bone: Part III. /sup 99m/Tc pyrophosphate autoradiographic changes. [X rays; rabbits]

Description: The macroautoradiographic and microautoradiographic localization of /sup 99m/Tc-pyrophosphate (/sup 99m/TcPPi) was studied in x-irradiated bone of rabbits up to one year post-irradiation. In cortical bone, /sup 99m/TcPPi was concentrated on bone surfaces near vasculature. Both forming and resorbing bone surfaces were comparably labeled at 2 hrs post-injection. Uptake on the surface of sites of haversian bone remodeling was observed to be at least part of the increased /sup 99m/TcPPi observed in irradiated bone in camera images. In irradiated trabecular bone 12 months following irradiation, a patchy decrease in /sup 99m/TcPPi uptake was correlated with localized decreases in vasculature.
Date: January 1, 1978
Creator: King, M.A.; Corriveau, O.; Casarett, G.W. & Weber, D.A.
Partner: UNT Libraries Government Documents Department

Plutonium and americium concentration along fresh-water food chains of the Great Lakes, U. S. A. Progress report, July 1976--September 30, 1977

Description: The primary purpose of studying the biogeochemical behavior of transuranic radionuclides in large freshwater lakes began with studies of the distribution of these radionuclides, essentially introduced from the fallout of atmospheric nuclear weapons tests, in Lake Ontario. The recognition that an additional source of supply of these nuclides to Lake Ontario (subsequent to their release into Lake Erie) existed in the form of leakage from the Nuclear Fuel Services reprocessing plant at Springville, New York, led to expansion of the program to include sampling at the eastern end of Lake Erie. Much of the program is devoted to studies of the distribution of these nuclides in the lake sediments as they appear to be a major repository for transuranics in freshwater lakes. The extent to which this is a temporary or permanent repository is illuminated by studies of transuranic distributions in the lake waters and biota.
Date: January 1, 1977
Creator: Bowen, V.T.
Partner: UNT Libraries Government Documents Department

Plutonium and cesium radionuclides in the Hudson River Estuary. Annual technical progress report, 1 December 1975--30 November 1976

Description: We have obtained a large set of cores from the Hudson Estuary covering nearly all of the ambient salinity range. A number of core sections have been analyzed for /sup 137/Cs, /sup 134/Cs, /sup 60/Co and /sup 40/K by direct gamma counting and for /sup 239/,/sup 240/Pu and /sup 238/Pu by alpha-spectrometry. Rapid accumulation, up to 20 cm/year, of sediments containing /sup 239/,/sup 240/Pu, /sup 137/Cs, /sup 134/Cs and /sup 60/Co occurs in New York Harbor. Marginal coves upstream from the harbor also serve as depositional environments. The ratio of sediment /sup 239,240/Pu to /sup 137/Cs is higher than the fallout ratio in the seaward end of New York Harbor, despite the presence of a significant component of reactor /sup 137/Cs in the sediments, but lower than the range of ratios observed by others for nearshore environments with low sediment deposition rates. A substantial portion of gamma emitting fission product and activation nuclides released from the Indian Point nuclear facility have accumulated in New York Harbor, more than 60 km downstream from the release area. We have not yet established whether local transuranic releases to the Hudson have occurred.
Date: January 1, 1976
Creator: Simpson, H. J. & Williams, S. C.
Partner: UNT Libraries Government Documents Department

Safety and Environmental Protection Division. Progress report, January 1, 1974--December 31, 1975. [Radionuclides in Bikini foods during 1974 and 1975 and environmental monitoring data for BNL during 1975]

Description: Progress is reported in the analysis of food chain samples collected during 1974 and 1975 at the Bikini Atoll in the Marshall Islands for /sup 90/Sr, /sup 137/Cs, /sup 239/Pu, /sup 240/Pu, and /sup 241/Am remaining in the environment from the 1946-1958 nuclear tests. Data on levels of radioactivity in environmental samples and SO/sub 2/ and NO/sub x/ in air samples collected in the vicinity of Brookhaven National Laboratory during 1975 are reported. Samples of surface air, surface waters, ground water, sediments and biota from streams, soils, grass, and milk were analyzed. Abstracts of papers published during 1974 and 1975 are included. (CH)
Date: January 1, 1977
Partner: UNT Libraries Government Documents Department

Liquid-vapor isotope fractionation factors in argon--krypton binary mixtures

Description: An equilibrium isotope effect has been studied as a continous function of the potential field acting on the atom undergoing isotopic exchange. This has been accomplished through a study of the liquid vapor isotope fractionation factors for both /sup 36/Ar//sup 40/Ar and /sup 80/Kr//sup 84/Kr in a series of binary mixtures which span the range between the pure components at 117.5/sup 0/K. The /sup 36/Ar//sup 40/Ar fractionation factor increases (linearly) from (1n..cap alpha..) 2.49x10/sup -3/ in pure liquid argon to 2.91 x 10/sup -3/ in an infinitely dilute solution in liquid krypton. Conversely, the /sup 80/Kr//sup 84/Kr fractionation factor decreases (linearly) from ln..cap alpha..) 0.98 x 10/sup -3/ in pure liquid krypton to 0.64x10/sup -3/ in an infinitely dilute solution in pure liquid argon. The mean force constants on both argon and krypton atoms in the mixtures are derived from the respective isotope fractionation factors. It is shown that the mean force constant on argon atoms in infinitely dilute solution in krypton is equal to the mean force constant on krypton atoms in infinitely dilute solution in argon. The mean force constants for argon and krypton as a function of composition have been calculated by a modified corresponding states theory which uses the pure liquids as input parameters.
Date: January 1, 1977
Creator: Lee, M. W.; Neufeld, P. & Bigeleisen, J.
Partner: UNT Libraries Government Documents Department

Technical progress report, October 1, 1974--September 30, 1975. [Dept. of Physics, Univ. of Wisconsin]

Description: The study of the scattering of polarized deuterons yielded improved optical potentials, particularly spin--orbit and tensor potentials. Extensive measurements of vector and tensor analyzing powers for (d,p), (d,n), and (d,t) reactions corrected several J/sup ..pi../ assignments, revealed deficiencies in DWBA calculations, showed some interesting systematics, gave evidence for two-step processes, and demonstrated important deuteron D-state effects. New vector and tensor polarimeters permitted routine beam-polarization checks. Analyzing powers measured to +-- 2 x 10/sup -4/ for p--p scattering at E/sub p/ = 10 MeV gave model-independent phase-shift analysis for E/sub p/ less than 25 MeV. Accurate analyzing powers and cross sections for p + ..cap alpha.. suggested a D-state component in the ..cap alpha.. particle. Precise absolute cross sections for several (n,p) and (n,..cap alpha..) reactions resulted from associated-particle measurements. Instrumentation for (p,n) and (..cap alpha..,/sup 8/Be) studies at intermediate energies is underway. Extensive isospin-forbidden cross sections gave level parameters for isospin-mixed /sup 18/F states and implied intermediate structure and ''bridge'' states. Level parameters for /sup 18/F unnatural-parity states resulted from /sup 16/O(d vector,..cap alpha../sub 3/)/sup 14/N(J = 0/sup -/) measurements. Radiative capture and scattering of ..cap alpha..'s by /sup 14/N, /sup 16/O, and /sup 20/Ne gave data about /sup 18/F, /sup 20/Ne, and /sup 24/Mg. Ion-source development work included a new type polarized source, a new sputter source, and a device for beam emittance measurements. (RWR)
Date: January 1, 1975
Creator: Richards, H. T.
Partner: UNT Libraries Government Documents Department