Quasielastic and fission total cross sections for /sup 16/O on /sup 181/Ta and /sup 208/Pb. [80 to 102 MeV]
The total quasielastic (inelastic plus few nucleon transfer) and fission cross sections were measured for /sup 16/O + /sup 208/Pb at incident energies of 80, 83, 88, 90, 96, and 102 MeV and for /sup 16/O + /sup 181/Ta at incident energies of 83, 90 and 96 MeV. The total quasielastic cross sections account for about 50 percent of the total /sup 16/O + /sup 208/Pb reaction cross section at the lowest incident energy which is near the Coulomb barrier. At the highest incident energy the /sup 16/O + /sup 208/Pb quasielastic cross section still accounts for 25 percent of the total cross section. The measured ratio of quasielastic to total cross section for /sup 16/0 + /sup 181/Ta is less than for /sup 16/O + /sup 208/Pb; however, in the case of the /sup 181/Ta target the inelastic transitions to the low lying levels in /sup 181/Ta were not resolved from elastic scattering. Within the uncertainties of the measurements the sum of the measured quasielastic and fission cross sections for /sup 16/O on /sup 208/Pb accounts for the total reaction cross section, indicating that the probability of fission of the /sup 224/Th compound and Th daughter systems is large. In contrast for /sup 16/O + /sup 181/Ta (/sup 197/Tl compound system) the fission and quasielastic channels account for only a small fraction of the total reaction cross section.
- Research Organization:
- Hanford Engineering Development Lab., Richland, Wash. (USA)
- DOE Contract Number:
- E(30-1)-16
- OSTI ID:
- 7263115
- Report Number(s):
- BNL-21268; CONF-760424-18
- Country of Publication:
- United States
- Language:
- English
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIRECT REACTIONS
ENERGY RANGE
EVEN-EVEN NUCLEI
FISSION
HEAVY ION REACTIONS
HEAVY NUCLEI
ISOTOPES
LEAD 208 TARGET
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
NUCLEAR REACTIONS
NUCLEI
OXYGEN 16 REACTIONS
PROBABILITY
QUASI-ELASTIC SCATTERING
QUASI-FREE REACTIONS
RADIOISOTOPES
SCATTERING
SECONDS LIVING RADIOISOTOPES
TANTALUM 181 TARGET
TARGETS
THORIUM 224
THORIUM ISOTOPES
TOTAL CROSS SECTIONS