Experiments Concerning the Low-energy States of N¹⁶ and 0¹⁹

Citation

Zimmermann, William (1958) Experiments Concerning the Low-energy States of N¹⁶ and 0¹⁹. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/VB5R-4S59. https://resolver.caltech.edu/CaltechETD:etd-01172006-092921

Abstract

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. Angular distributions for four groups of protons from the N15(d,p)N16 reaction have been measured using 2.75-Mev deuterons. These groups are those which leave N16 in its states at 0, 0.119, 0.293, and 0.392 Mev. The distributions show pronounced stripping characteristics and have been compared to the distributions given by the simple Butler theory. The comparisons indicate that the ground state is formed by the addition of an [...] = 2 neutron to N15, the 0.119-Mev state by an [...] = 0 neutron, the 0.293-Mev state by an [...] = 2 neutron, and the 0.392-Mev state by an [...] = 0 neutron. The mean life of the 0.119-Mev state has been measured by a beam-chopping technique and is found to be 7.83 (1 +/- 0.04) microseconds. Angular distributions for three groups of protons from the O18(d,p)O19 reaction have been measured, those leaving O19 in its states at 0, 0.096, and 1.47 Mev. 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 [...] = 2 neutron and of the 1.47-Mev state by an [...] = 0 neutron. However, the distribution of protons leaving O19 in its 0.096-Mev state does not lend itself to a stripping interpretation. It is found that the [...]-decay of the 1.47-Mev state of O19 proceeds mostly to the 0.096-Mev state. The mean life of the 0.096-Mev state has been measured by a recoil technique and is found to be 1.75(l +/- 0.16)10(-9) seconds. These observations appear to restrict the possible assignments of spin and parity for the 0.096-Mev state to [...] = [...] or [...].

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