Elsevier

Annals of Physics

Volume 54, Issue 3, October 1969, Pages 566-597
Annals of Physics

S- and P-wave neutron spectroscopy. XII. Higher resolution techniques in the keV region with windowless gas targets

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Abstract

The relative total yield of the O18(p, n) reaction has been studied from threshold to 3.290 MeV with a proton resolution of about 111,000. A previously unreported resonance was observed and improved values of widths and energies were obtained for the other resonances. The Q value for the reaction was determined to be −2439 ± 1 keV which places threshold at 2576 ± 1 keV.

The reaction took place in the windowless cryogenic target chamber. A gas handling system was developed to allow one liter of oxygen gas, 65% enriched in O18, to be cycled through the target chamber and recovered with a minimum of loss or dilution.

The O18(p, n) neutrons were used in a series of transmission measurements to test the resolution capability of the gas target as a neutron source. Results were in good agreement with resolution predictions. Total neutron energy spreads were 250 eV and 500 eV at neutron energies of 30 keV and 525 keV respectively.

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    Now at U. S. Naval Base, Charleston, S. C.

    Now at E. I. duPont, Savannah River Laboratory, Aiken, S. C. 29801

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