PART I. THE DECAY OF Ru$sup 105$, Pd$sup 109$, AND Rb$sup 86$. PART II. THE FISSION OF GOLD WITH INTERMEDIATE ENERGY HELIUM IONS (thesis)
In the course of radiochemical determinations of the fission mass yield curves of heavy element nuclides it became necessary to know the decay schemes of certain fission product isotopes. Of special interest were Ru/sup 105/ and Pd/ sup 109/ as they are situated in the valley region of the mass yield distributions. Rb/sup 86/ was studied because of the wide deviations in the published branching ratios. A decay scheme for Ru/sup 105/ was proposed with levels existing at 130, 395 (or 530), 475, 685, 726, 795, 960, 1350, and 1720 kev. These levels are excited by beta groups of the maximum energies 1875, 1185, 1150, 1080, 915, 525, and 155 kev. A decay scheme for Pd/sup 109/ having levels at 88, 217, 258, 307, 260 and 400 kev beta groups in addition to the 1030 kev beta ray wss established. The half lives of Ru/sup 105/, Rh/sup 105/, and Pd/sup 109/ were determined as 4.43 plus or minus 0.02 hrs, 35.88 plus or minus 0.02 hrs and 13.47 plus or minus 0.01 hrs, respectively. The branching ratio of Rb/sup 86/ was experimentally measured as 8.79 plus or minus 0.09%. The fission of elements lighter than Th is of interest because of the possibility of observing the relative amounts of symmetric and asymmetric fission modes. The fission mass yield distributions of Bi/sup 209/ and natural Re both show the presence of an asymmetric mode and it was of interest to investigate those distributions resulting from the fission of gold. In this study, Au/sup 197/ was bombarded with 32 to 41 Mev He ions. The fission product nuclides were separated radiochemically, purified from spallation product contamination by ion exchange, solvent extractio and quantitative chemical separations and assayed in a low- level beta flow counter. The results appear to show that the mass yield distributions contain less than 1% of symmetric fission down to a He ion bombarding energy of 32 Mev. The symmetric fission mode is highly energy sensitive, varying by a factor of 100 over the energy range investigated. The number of neutrons boiled off var d linearly from 5 at 40.4 Mev to 3 at 32.0 Mev. An independent yield was measured for Br/sup 82/ at a He ion bombarding energy of 37.8 Mev which was consistent with a ne tron boil off'' of 4.5. (auth)
- Research Organization:
- Purdue Univ., Lafayette, Ind.
- DOE Contract Number:
- AT(11-1)-347
- NSA Number:
- NSA-16-012450
- OSTI ID:
- 4798209
- Report Number(s):
- TID-15161
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- United States
- Language:
- English
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