States in O16 between 12.67 and 13.80 Mev

F. B. Hagedorn
Phys. Rev. 108, 735 – Published 1 November 1957
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Abstract

A study of the elastic scattering of protons from N15 is reported for proton energies between 600 and 1800 kev and for scattering angles from 75° to 160°. The technique for the preparation of the N15 targets is discussed. Anomalies in the scattering cross section are observed near incident proton energies of 710, 898, 1028, 1210, and 1640 kev, corresponding to states in O16 from 12.78 to 13.65 Mev. Analysis of these scattering data leads to the assignments J=0, J=2, J=1, J=3, and J=1+ for the 710, 898, 1028, 1210, and 1640-kev states respectively. These assignments agree with earlier work except for the 710-kev resonance, which is reported here for the first time, and the 1210-kev level, which was previously reported to be J=4+. The angular distribution of the α-particles resonant at 1210 kev from the reaction N15(p, α1γ)C12 has been remeasured and requires J=4+ as was found previously. However, a measurement of the αγ angular correlation function at 1210 kev is found to be consistent with J=3 but not J=4+. This discrepancy has not been resolved, but the evidence favoring the assignment J=3 is quite strong. Suggestions for the isotopic spin quantum numbers for these five states in O16 are made.

  • Received 8 July 1957

DOI:https://doi.org/10.1103/PhysRev.108.735

©1957 American Physical Society

Authors & Affiliations

F. B. Hagedorn*

  • Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California

  • *Now at Bell Telephone Laboratories, Murray Hill, New Jersey.

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Issue

Vol. 108, Iss. 3 — November 1957

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