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Fluorine-plus-proton reactions

Peterson, R. W. and Fowler, W. A. and Lauritsen, C. C. (1954) Fluorine-plus-proton reactions. Physical Review, 96 (5). pp. 1250-1258. ISSN 0031-899X. http://resolver.caltech.edu/CaltechAUTHORS:PETpr54b

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Abstract

The properties of certain energy levels in O16, F19, and Ne20 have been studied by observations on the alpha particles and inelastic protons from the bombardment of fluorine by protons. A high-resolution magnetic analysis of the alpha-particle groups to the 2+ and 1- levels in O16 from the F19(p, α)O16* reaction failed to reveal any doublet structure in these known levels. The angular distributions of the alpha-particle groups to these levels did not indicate degeneracy with a 2- level, nor did a search for new excited levels in O16 up to 8.7-Mev excitation reveal a 2- level. These results are not in agreement with the alpha-particle model of the O16 nucleus which predicts a 2- state close in energy to the 2+ state. Angular distributions of the alpha particles were measured at proton bombarding energies of 873, 935, 1290, 1355, and 1381 kev. The distributions at 1355 kev indicated that the corresponding Ne20 resonance level at 14.16 Mev has spin 2 and odd parity. The spin and parity assignments previously found for the other levels were confirmed. A study of the inelastic proton groups from the F19(p, p′)F19* reaction gave 108.8±0.8 and 196.0±1.4 kev for the excitation energies of the two lowest excited levels of F19. The cross sections at the 1431-kev resonance for these groups in the center-of-mass system were 0.187±0.015 barn for the first group and 0.007 ±0.002 barn for the second group. At 1381 kev the cross section was 0.0427±0.0040 barn for protons to the second excited level. Angular distributions of the proton groups were measured and, in conjunction with other studies made in this laboratory, resulted in spin and parity assignments of ½- and 3/2+ for the first and second excited states of F19, respectively.


Item Type:Article
Additional Information:©1954 The American Physical Society. Received 16 August 1954. In conclusion we wish to express our appreciation to C.A. Barnes, R.F. Christy, R. Sherr, and J. Thirion for many discussions of these results. This work was assisted by the joint program of the U.S. Office of Naval Research and the U.S. Atomic Energy Commission.
Issue or Number:5
Record Number:CaltechAUTHORS:PETpr54b
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:PETpr54b
Alternative URL:http://dx.doi.org/10.1103/PhysRev.96.1250
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9953
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:28 Mar 2008
Last Modified:26 Dec 2012 09:54

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