Substate Populations and Nuclear Polarization Produced by Inelastic Alpha-Particle Scattering on Carbon-12

T. D. Hayward and F. H. Schmidt
Phys. Rev. C 1, 923 – Published 1 March 1970
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Abstract

We have measured the normalized αγ angular correlation in the reaction plane for excitation of the 4.44-MeV, 2+ state of C12 at 22.750 MeV. These data yield the relative populations (am)2 of the three magnetic substates referred to the normal to the reaction plane. The ambiguity between (a+2)2 and (a2)2 was resolved by coincidence measurements of the circular polarization of deexcitation γ rays emitted near the normal to the reaction plane. The inelastic scattering process can then be dissected into partial differential cross sections σm to the substates. The results show that each σm has a different angular dependence. σ0 has the most regular and pronounced diffractionlike structure, σ2 dominates out to 75°, and σ+2 dominates thereafter. Thus, the excited nuclei spin in the sense of classical hard-sphere scattering with friction out to ≈ 75°, and in the reverse sense from ≈ 75° to ≈ 170°. The nuclear polarization exhibits an oscillatory character as a function of angle. Comparison of the results with diffraction-model calculations, and with distorted-wave Born-approximation calculations, is poor. In principle, the experimental method, though difficult, could be applied to nuclei which are more accurately described by nuclear models than is C12.

  • Received 23 September 1969

DOI:https://doi.org/10.1103/PhysRevC.1.923

©1970 American Physical Society

Authors & Affiliations

T. D. Hayward* and F. H. Schmidt

  • Department of Physics, University of Washington, Seattle, Washington 98105

  • *Present address: Duke University, Durham, N.C.

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Vol. 1, Iss. 3 — March 1970

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