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Coulomb Excitation of F19 by Alpha Particles

Sherr, R. and Li, C. W. and Christy, R. F. (1954) Coulomb Excitation of F19 by Alpha Particles. Physical Review, 96 (5). pp. 1258-1266. ISSN 0031-899X. http://resolver.caltech.edu/CaltechAUTHORS:SHEpr54b

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Abstract

Gamma rays emitted in the excitation of F19 by α particles of 0.6 to 2.8 Mev have been studied. Resonances are found in the reaction F19(α, p)Ne22* at α particle energies greater than 1.3 Mev and in the inelastic excitation of 109-kev and 196-kev levels in F19 at energies greater than 2.2 Mev. At bombarding energies below 2 Mev, the cross sections for inelastic excitation of F19 decrease much too slowly for compound nucleus formation and are identified as being due to Coulomb excitation. The observed cross sections in the region 0.6 Mev to 2 Mev agree well with the theory for Coulomb excitation. The electromagnetic transition probabilities for decay of these states deduced from the excitation cross sections are in good agreement with those found from direct measurement of the lifetimes by Thirion, Barnes, and Lauritsen. Together with the results of Peterson, Barnes, Fowler, and Lauritsen on the inelastic excitation of fluorine by protons, these experiments lead to spin and parity assignment of ½- for the 109 kev state and 5/2+ for the 196-kev state of F19. The observed angular distributions of the γ rays from Coulomb excitation by α particles are also in accord with theory.


Item Type:Article
ORCID:
AuthorORCID
Li, C. W.0000-0002-0758-5334
Additional Information:©1954 The American Physical Society Received 16 August 1954 The authors take pleasure in acknowledging the many discussions of these problems with C.A. Barnes, W.A Fowler, C.C. Lauritsen, and J. Thirion of the Kellogg Radiation Laboratory. Assisted by the joint program of the Office of Naval Research and the U.S. Atomic Energy Commission.
Issue or Number:5
Record Number:CaltechAUTHORS:SHEpr54b
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SHEpr54b
Alternative URL:http://dx.doi.org/10.1103/PhysRev.96.1258
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6566
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:13 Dec 2006
Last Modified:25 Mar 2019 22:14

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