Levels of P29 from Si28(p, p)Si28 and Si28(p, p)Si28*

J. Vorona, J. W. Olness, W. Haeberli, and H. W. Lewis
Phys. Rev. 116, 1563 – Published 15 December 1959
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Abstract

Differential cross sections for the elastic and inelastic scattering of protons from Si28 have been measured at center-of-mass scattering angles of 167.7°, 141.3°, 90.0°, and 54.7° for proton energies between 1.4 and 3.8 Mev. Resonances were observed at proton energies of 1.66, 2.09, and 2.88 Mev, in addition to the resonances at 3.10, 3.34, 3.58, and 3.71 Mev which correspond to levels in P29 reported previously by other investigators from studies of the γ rays from Si28(p, pγ)Si28. Differential cross sections and angular distributions for inelastic scattering to the 1.78-Mev first excited state of Si28 were also measured for proton energies above 3 Mev. Measurements were made with a gas scattering chamber containing silane (SiH4) as the target gas. The elastic scattering data were analyzed in terms of the single-level approximation of the dispersion theory to determine the resonance parameters. This analysis, together with the analysis of the inelastic scattering cross sections and angular distributions, has resulted in the following assignments of resonance energies (Mev) and spins and parities for the resonance levels of P29: 1.660 (32); 2.090 (12+); 2.88 (12); 3.100 (52); 3.337 (32+); 3.575 (32); and 3.711 (32+). The large reduced elastic scattering widths of the p-wave resonances at 1.660 and 2.88 Mev suggest that these levels correspond to single-particle excitations of P29.

  • Received 22 July 1959

DOI:https://doi.org/10.1103/PhysRev.116.1563

©1959 American Physical Society

Authors & Affiliations

J. Vorona*, J. W. Olness, W. Haeberli, and H. W. Lewis

  • Duke University, Durham, North Carolina

  • *Now with the U. S. Government.
  • Now at the Aeronautical Research Laboratory, Wright Patterson Air Force Base, Ohio.
  • Now at the University of Wisconsin, Madison, Wisconsin.

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Vol. 116, Iss. 6 — December 1959

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