A Study of the Fluorine Plus Proton Reactions

Citation

Peterson, Robert Williams (1954) A Study of the Fluorine Plus Proton Reactions. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/HKJ0-PT95. https://resolver.caltech.edu/CaltechETD:etd-01282004-114804

Abstract

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The F19 plus proton reactions were studied in an attempt to obtain some information about the energy levels in O16 and F19, and indirectly about levels in Ne20. A high resolution magnetic analysis of the alpha particle groups to the 1[superscript -] and 2[superscript +] levels in O16 from the [...] reaction failed to reveal any doublet structure in these known levels. The angular distributions of the alpha particle groups to the levels did not indicate any degeneracy with a 2[superscript -] level, nor did a search for new excited levels in O16 up to 9.1 Mev reveal a 2[superscript -] level. Angular distributions of the alpha particles were measured at bombarding energies of 874, 935, 1290, 1355, and 1381 kev. The distributions at 1355 kev indicated that the corresponding Ne20 resonance level at 14.23 Mev excitation has spin 2 and odd parity. A study of the inelastic proton groups from the [...] reaction gave 113.9 [plus or minus] 0.8 and 199.6 [plus or minus] 0.7 kev for the excitation energies of the two lowest known levels of F19. The cross sections at 1431 kev for these groups in the center of mass system were found to be 0.187 [plus or minus] 0.015 barns for the first group and 0.007 [plus or minus] 0.002 barns for the second group. At 1381 kev, the cross section was found to be 0.0427 [plus or minus] 0.0040 barns for protons to the second excited level. Angular distributions were measured where possible, but did not give unique assignments for the levels. However, all distributions obtained were consistent with the assignments made to the levels on the basis of the gamma-ray work done in this laboratory.

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