Measurements of the Interaction of 95-Mev Protons with He4

W. Selove and J. M. Teem
Phys. Rev. 112, 1658 – Published 1 December 1958
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Abstract

Elastic and inelastic scattering and the (p, d) "deuteron pickup" process have been studied using a proton beam of energy about 95 Mev incident on a liquid helium target. The elastic scattering shows a nuclear Coulomb interference dip at 9°, a slight diffraction-type minimum at about 57°, and a deep minimum, approximately 1029 cm2/sterad at 135°. (All angles and cross sections are in the center-of-mass system.) Inelastic scattering spectra were obtained at laboratory angles of 10°, 15°, and 30°. These spectra are characterized by broad peaks, roughly 10-Mev wide, centered around an energy about 6 Mev below the upper kinematical limit for inelastic scattering. Their interpretation is discussed qualitatively both in terms of quasi-elastic nucleon-nucleon scattering and in terms of strong interaction between parts of the dissociated α particle in virtual or continuum states. A minimum was observed in the He4(p, d)He3 differential cross section at about 29°. Analysis of the (p, d) data at 95 Mev and 32 Mev in the "transparent nucleus" Born approximation yielded inconsistent results; presumably this inconsistency is due to the failure of the model at the lower energy due to the tightly bound structure of He4.

  • Received 26 May 1958

DOI:https://doi.org/10.1103/PhysRev.112.1658

©1958 American Physical Society

Authors & Affiliations

W. Selove* and J. M. Teem

  • Harvard University, Cambridge, Massachusetts

  • *Now at the University of Pennsylvania, Philadelphia, Pennsylvania.
  • Now at the California Institute of Technology, Pasadena, California.

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Vol. 112, Iss. 5 — December 1958

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