Neutron angular distributions for C__(a,n)O__ and excitation functions of alpha particles elastically scattered from C__
Dean, Phillip Nolan
Risser, J. R.
Master of Arts
Experimental investigation of nuclear energy levels can be carried out in a number of ways. Among these are the observation of angular distributions and excitation functions of elastically scattered particles and reaction products when the scattering and reactions proceed by way of excited states of a compound nucleus in the region of excitation where the states show up as well resolved resonances. This experiment involves the excited states of 8O17 in the range of excitation energies from about 8 to about 10 Mev. formed by the alpha-particle bombardment of 6C13. The 6C13(a,n)8O16 reaction was first studied in the alpha-particle energy range above 2 and up to 5.5 Mev by Bonner, Kraus, Marion and Schiffer* The experimental work described below consisted of my contribution to the measurement and analysis of neutron angular distributions at several resonances, and of a start toward the investigation of the elastic scattering. In the case of the reaction, I aided in taking experimental angular distributions at 2.60, 2.69, 2.77 and 2.82 Mev, correcting the data for efficiency of the detector, and computing the coefficients of the Legendre polynomial expressions for the angular distributions. This is described in Part I of the thesis. Part II of the thesis deals with the work on elastic scattering. This consisted of preliminary angular distributions and excitation curves of elastically scattered alpha-particles from thin solid foils of C13 . The method of making the foils was an important part of this investigation.