/sow ORN 1-4791 PRO qehiod Ending day20, 1972 DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency Thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available original document. Printed in the United States of America. Available from National Technical Information Service US. Department of Commerce 5285 Port Royal Road, Springfield, Virginia 22151 Price: Printed Copy $3.00; Microfiche $0.95 This report was prepared as an account of work sponsored by the United States Government. Neither the United States nor the United States Atomic Energy Commission, nor any of their employees, nor any of their contractors, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness or usefulness of any information, apparatus, product or process disclosed, or represents that its use would not infringe privately owned rights. ORNL-4791 UC-4 - Chemistry Contract No. W-7405-eng-26 CHEMISTRY DIVISION ANNUAL PROGRESS REPORT for Period Ending May 20, 1972 E. H. Taylor, Director Sheldon Datz, Associate Director Ralph Livingston, Associate Director B. H. Ketelle, Assistant Director G. E. Moore, Editor of Annual Report ---__ _. NOTICE I This report was prepared as an account of work sponsored by the United States Government. Neither the United States nor the United States Atomic Energy Commission, nor any of their employees, nor any of their contractors, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, com- pleteness or usefulness of any information, apparatus, product or process disclosed, or represents that its use would not infringe privately owned rights. AUGUST 1972 OAK RIDGE NATIONAL LABORATORY Oak Ridge, Tennessee 37830 operated by UNION CARBIDE CORPORATION for the This document is U.S ATOMIC ENERGY COMMISSION PUBLICLY RELEASABLE Authorizing dlfficial Dak h-l4-4+ Reports previously issued in this series are as follows: ORNL-2386 Period Ending June 20, 1957 ORNL-'2584 Period Ending June 20, 1958 ORNL-2782 Period Ending June 20, 1959 ORNL-2983 Period Ending June 20, 1960 ORNL-3 176 Period Ending June 20, 196 1 ORNL-33 20 Period Ending June 20, 1962 ORNL-3488 Period Ending June 20, 1963 ORNL-3679 Period Ending June 20, 1964 ORNL-3832 Period Ending May 20, 1965 ORNL-3994 Period Ending May 20, 1966 ORNL-4164 Period Ending May 20, 1967 ORNL-4306 Period Ending May 20, 1968 ORNL-443 7 Period Ending May 20, 1969 ORNL-458 1 Period Ending May 20, 1970 ORNL-4706 Period Ending May 20, 1971 Contents INTRODUCTION ........................................................................ ix 1 . NUCLEAR CHEMISTRY Thermal-Neutron Capture Cross Section and Resonance Integral for 10.7-Year 85Kr ..................... 1 Search for Beta Decay of 96Zr ............................................................... 1 Gamma-Ray Studies on the Decay of 2.42-min Ag ............................................. 2 * Nd Decay ............................................................................ 2 Discovery of New Isotopes Far from Stability ................................................... 4 BranchingRatio~of'~~Dy.'~'Dy.and149mTb ................................................ 5 Coulomb Excitation of IO'States in 16'Dy and '64Dy ........................................... 6 BandMixinginls6Gd and ls8Gd ............................................................ 8 M1 Admixtures of Transitions in ' Gd ....................................................... 11 Level Structure of ' ' Hf ................................................................... 12 Transitions of Low Intensity in the Decay of '06T1 ............................................... 14 Single-Particle Transfer Reactions in "'Pb Induced by High-Energy ' 'C Ions .......................... 15 Coulomb Excitation with Heavy-Ion Beams at ORIC .............................................. 15 The Effect of Hexadecapole Moments on the Coulomb Excitation of the Actinides ...................... 16 Search for Conversion Electrons from the '36 U Fission Isomer ...................................... 16 Abundances of Primordial and Cosmogenic Radionuclides in Apollo 14 Rocks and Fines .................. 17 Studies of Primordial Radioelements and Cosmogenic Radionuclides in Apollo 15 Samples by Nondestructive Gamma-Ray Spectrometry I ................................................... 19 2 . CHEMISTRY AND PHYSICS OF TRANSURANIUM ELEMENTS Calculations of Spallation-Fission Competition in the Reactions of Protons with Heavy Elements at Energies <3 GeV ......................................................... 21 Compound-Nuclear and Transfer Reactions in ' 'C Reactions with 238Uand 239Pu ..................... 22 Nuclear Charge Distribution of Heavy Fission Fragments in the Reaction Z39Pu(nthf) ................... 23 States in 236U~iathe (d.d') Reaction and in the AlphaDecayof 240Pu............................... 24 Intrinsic Quadrupole and Hexadecapole Moments for Even-Even Transuranium Nuclei and the Equilibrium Deformations ................................................................. 25 Neutron Multiplicity Distribution Measurements in the Spontaneous Fission of 24 6Cm. 24 8Cm. and '"Cf ............................................................................. 26 -3 Absolute Specific Activity of 249Cfand Half-Lives for 249Cf.z50Cf. 25'Cfand "'Cf .................. 27 Neutron-Induced Fission Cross Sections for 24 9Cf in the Energy Range 0.32 eV <E, < 1.5 MeV ........... 27 iii . iv n Further Experiments on the New Isotope. Nobelium-259 .......................................... 29 Attempted 2 Identification of ' 2256 Lr and 7. Rf .......................................... 31 Radioactivity Associated with Radiohalos ...................................................... 33 Search for Superheavy Elements in Nature ...................................................... 33 Neutron Emission Measurements of Natural Samples .............................................. 34 Samples Counted in LBL Neutron Multiplicity Counter in a Search for Superheavy ElementsinNature ...................................................................... 36 i ' Search for Superheavy Elements in Tantalum Targets from SLAC .................................... 37 Search for Superheavy Elements in Tungsten and Uranium Targets from BNL .......................... 38 Search for Superheavy Elements in U-Zr Targets from Rutherford High-Energy Laboratory ................ 39 Relative Energies of the Lowest Levels of theplps2,~ds2, and thepl'ls' Electron Configurations of the Lanthanide and Actinide Neutral Atoms ............................. 39 Electron-Transfer andf + d Absorption Bands of Some Lanthanide and Actinide Complexes and the Standard (11-111) Oxidation Potentials for Each Member of the Lanthanide and Actinide Series ......................................................................... 40 Systematics Correlating Some Thermodynamic Properties of the Lanthanide and Actinide Metals ........... 40 Electron Binding Energies in Americium ....................................................... 40 Evaluation of Atomic Energy Levels and X-Ray Energies for the Actinide Elements ...................... 41 Spectrophotometric Study of the Formation of Americium Thiocyanate Complexes ..................... 44 Stability Constants of the Monochloro Complexes of Bk(II1) and Es(II1) .............................. 45 Stabilization of Divalent Californium in the Solid State: Californium Dibromide ........................ 45 Preparation of Anhydrous Lanthanide Halides by Ligand Exchange .................................. 46 Organolanthanides ........................................................................ 46 Studies with HeptavalentiNeptunium: Identification and Crystal-Structure Analysis of L~CO(NH~)~N~,Os(OH)2 .2H2 0 ........................................................... 47 Crystal Structure and Lattice Parameters of Curium-248 Oxychloride, 24 8CmOC1 ....................... 48 Crystal Structures of Californium Trichloride ................................................... 49 Crystal Structure of Californium Tribromide .................................................... 50 Microchemical Preparations of Heavy-Element Metals ............................................. 51 3 . ISOTOPE CHEMISTRY Fractionation of Carbon Isotopes:z The CYANEX System .......................................... 52 Separation of Cobalt Isotopes by Ion Exchange .................................................. 53 Solvent Extraction of Cesium and Rubidium Triphenylcyanoboron .................................