Neutrons and Gamma Rays from the Bombardment of O16 by He3

K. L. Dunning and J. W. Butler
Phys. Rev. 123, 1321 – Published 15 August 1961
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Abstract

The threshold energy for the O16(He3, n)Ne18 reaction has been measured. The value obtained, 3.811±0.015 Mev, determines the mass of Ne18 to be 18.011446±0.000014 amu (O16 standard, 1960 mass tables). The slow-fast ratio method for the observation of neutron thresholds was employed at bombarding energies from the ground-state threshold to 5.6 Mev, corresponding to a region of excitation in the residual nucleus from zero to 1.5 Mev. No excited states in Ne18 were identified. The bombardment of O16 by He3 also produced the reactions O16(He3, p)F18 and O16(He3, α)O15. Energy spectra were obtained by means of a scintillation spectrometer for gamma rays resulting from certain transitions in F18 and O15. For 4.5-Mev He3 particles impinging on a 1-Mev thick target of TiO2, gamma rays of the following energies were observed and attributed to F18: 0.652±0.007, 0.939±0.005, 1.041±0.005, 1.17±0.01, 1.61±0.02, 1.68±0.02, 2.09±0.01, 2.51±0.01, 2.65±0.05, 3.06±0.05, 3.35±0.10?, and 3.84±0.10 Mev. The following gamma rays were also observed and attributed to O15: 5.25±0.05, 6.22±0.10, and 6.87±0.10 Mev.

  • Received 11 April 1961

DOI:https://doi.org/10.1103/PhysRev.123.1321

©1961 American Physical Society

Authors & Affiliations

K. L. Dunning and J. W. Butler

  • Nucleonics Division, U. S. Naval Research Laboratory, Washington, D. C.

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Issue

Vol. 123, Iss. 4 — August 1961

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