Research in nuclear chemistry. Annual progress report, September 15, 1974- -September 14, 1975
The nuclear chemistry research program at Carnegie-Mellon University includes studies of nuclear reactions induced by heavy ions, nuclear properties, nuclear transitions and decay, and the hyperfine interactions of nuclear moments with extranuclear environments. Gamma-ray angular correlation measurements in the decay of $sup 75$Se have been carried out, and the data indicate absence of appreciable perturbation in the $sup 5$$/$$sub 2$$sup -$ intermediate nuclear state in $sup 75$As. Integral and time-differential perturbed-angular-correlation experiments in $sup 181$Ta have elucidated strong quadrupolar interaction effects in several compounds. The origins of the observed electric field gradients are traceable to chemical bonding effects. Studies have been made of the evaporation residues from complete fusion reactions induced by heavy ion beams in several target nuclei, using a new experimental technique. Measurements of energy spectra, angular distributions, and total cross-sections for these processes have been carried out for $sup 16$O + $sup 27$Al, $sup 20$Ne + Cu, and $sup 20$Ne + In. Proton evaporation spectra in coincidence with evaporation residues were determined in one case. In other studies, light fragments from the reaction of $sup 12$C with $sup 65$Cu were identified in a counter telescope, and cross sections for production of boron isotopes were determined by integration of the measured angular distributions of the several species. The cross-section for the process $sup 12$C + $sup 65$Cu $Yields$ $sup 12$B is found to be very much smaller than radioactivity measurements of $sup 65$Zn from the same reaction, and hence $sup 12$B and $sup 65$Zn are probably not correlated fragments in a two- body break-up. (auth)
- Research Organization:
- Carnegie-Mellon Univ., Pittsburgh, Pa. (USA). Dept. of Chemistry
- Sponsoring Organization:
- US Energy Research and Development Administration (ERDA)
- DOE Contract Number:
- AT(11-1)-3246
- NSA Number:
- NSA-33-013568
- OSTI ID:
- 4105495
- Report Number(s):
- COO-3246-15
- Resource Relation:
- Other Information: Orig. Receipt Date: 30-JUN-76
- Country of Publication:
- United States
- Language:
- English
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