Positions and Widths of O17 Levels from 4- to 6-Mev Excitation

Cornelius P. Browne
Phys. Rev. 108, 1007 – Published 15 November 1957
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Abstract

The O16(d, p)O17 reaction was used to measure the positions and widths of O17 levels from 4- to 6-Mev excitation. Proton spectra were obtained at high resolution with a broad-range spectrograph. This instrument accurately measured the widths and shapes of the energy distributions of the proton groups arising from the wider levels. Disagreements among other experiments concerning the O17 levels are explained in terms of the large difference in level widths. A comparison of these directly measured widths is made with those obtained from neutron scattering experiments. The observed shape of the energy distribution is that predicted by resonance theory. The 0.87-Mev level is found to be single rather than double as recently suggested. Excitation energies obtained (in Mev) are 0.871±0.004, 3.055±0.004, 3.846±0.005, 4.553±0.006, 5.083±0.010, 5.215±0.005, 5.378±0.007, 5.695±0.005, 5.731±0.005, 5.866±0.005, 5.94±0.015. Widths of levels 4, 5, 7, and 11 are (in kev) 40±5, 95±5, 28±7, and 23±10, respectively. The other levels have widths less than 8 kev.

  • Received 5 August 1957

DOI:https://doi.org/10.1103/PhysRev.108.1007

©1957 American Physical Society

Authors & Affiliations

Cornelius P. Browne*

  • Physics Department and Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts

  • *Most of the data analysis and calculations appearing in this paper were carried out at the author's present address, the University of Notre Dame, Notre Dame, Indiana.

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Vol. 108, Iss. 4 — November 1957

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