Substate Excitation of 2+ States Produced by Inelastic Scattering of Protons on C12, Fe54, and Ni58

J. R. Tesmer and F. H. Schmidt
Phys. Rev. C 5, 864 – Published 1 March 1972
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Abstract

A combined analysis of absolute in-plane and z-axis (spin-flip) pγ angular correlation measurements for 0+-2+-0+ transitions leads to various combinations of substate cross sections, populations, and phase angles. These quantities are compared with predictions based on reaction-mechanism theories. The test is very stringent. Measurements and analyses have been carried out for C12(p,pγ)C*12(4.44 MeV) and Ni58(p,pγ)Ni*58(1.45 MeV) at Ep=20 MeV, and for Fe54(p,pγ)Fe*54(1.41 MeV) at Ep=19.6 MeV.

Each of the three nuclei studied exhibits the following qualitative features: (1) The total inelastic cross sections have a less pronounced structure than do the individual substate cross sections. (2) The M=0 cross section is the most diffractionlike; the oscillations are out of phase with respect to the oscillations of the elastic cross section. (3) The sum of the M=+2 and M=2 cross sections also are diffractionlike, but are not in phase with the M=0.

Detailed comparisons with collective-model distorted-wave Born-approximation predictions are, on the whole, quite good for Ni58 and Fe54, especially when the full Thomas form for the spin-dependent perturbation potential is used. The isotropic term in the in-plane angular-correlation function is particularly sensitive to the form and strength of the spinorbit coupling potential. For Fe54 the predictions are further improved when the strength of the spin-dependent perturbation potential is increased by setting the spin-dependent deformation equal to twice the central-potential deformation.

  • Received 19 October 1971

DOI:https://doi.org/10.1103/PhysRevC.5.864

©1972 American Physical Society

Authors & Affiliations

J. R. Tesmer* and F. H. Schmidt

  • Department of Physics, University of Washington, Seattle, Washington 98195

  • *Present address: Department of Physics, Purdue University, Lafayette, Indiana 47907.

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Issue

Vol. 5, Iss. 3 — March 1972

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