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Experiments concerning the low-energy states of the O19 nucleus

Zimmermann, W., Jr. (1959) Experiments concerning the low-energy states of the O19 nucleus. Physical Review, 114 (3). pp. 837-846. ISSN 0031-899X. doi:10.1103/PhysRev.114.837.

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Angular distributions have been measured for three groups of protons from the O18(d, p)O19 reaction, those leaving O19 in its states at 0, 0.096, and 1.47 Mev. Deuteron energies of 1.74 and 2.50 Mev in the laboratory system were used. The distributions of protons leaving O19 in its ground state and in its 1.47-Mev state are characteristic of stripping and indicate the formation of the ground state by an l=2 neutron and of the 1.47-Mev state by an l=0 neutron. However, the distribution of protons leaving O19 in its 0.096-Mev state does not lend itself to a stripping interpretation. It has been found that the γ decay of the 1.47-Mev state of O19, following the formation of this state in the O18(d, p)O19 reaction, proceeds mostly to the 0.096-Mev state. The mean life of the 0.096-Mev state has been measured by observing the decay in flight of recoiling excited O19 nuclei and is found to be 1.75(1±0.16)×10^-9 second. These observations restrict the likely assignments of spin and parity for the 0.096-Mev state to 3/2± or 5/2+.

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Additional Information:©1959 The American Physical Society. Received 1 December 1958. It is a pleasure for the author to acknowledge the kind assistance given him by the personnel of the Kellogg Laboratory and to thank in particular Professor C.A. Barnes, Professor R.F. Christy, Professor T. Lauritsen, and Professor W. Whaling for their suggestions and advice. The author is indebted to Dr. A.O.C. Nier of the University of Minnesota for supplying the O18 enriched oxygen gas and to Mr. Ian Duck for checking the theoretical lifetime calculations. Finally, the author would like to express his appreciation for the financial support of a Dow Chemical Company fellowship during part of this work. Supported in part by the joint program of the Office of Naval Research and the U.S. Atomic Energy Commission.
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9308
Deposited By: Tony Diaz
Deposited On:12 Dec 2007
Last Modified:08 Nov 2021 20:58

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