Elastic Scattering of 31-Mev He$sup 3$ Ions From Several Elements

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The absolute differential cross sections for elastic scattering of 31- Mev He/sup 3/ ions on Be, Al, Cu, Sn/sup (nat)/, Sn/sup 120/ and Bi were measured in the angular range of approximately 10 to 120 deg in the center-of-mass system. Thin selfsupporting foil targets were chosen to span the parameter A/sup 1/3/, where A is the target mass number. The first excited states of the isotopes of these elements had sufficient energy separation from the ground state to enable elastic scattering to be resolved from inelastic scattering. The detection system, consisting of CsI(Tl) scintillation crystals, was capable of 3% pulse- ... continued below

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Pages: 31

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Igo, G.; Vidal, J. G. & Markowitz, S. S. December 31, 1961.

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Description

The absolute differential cross sections for elastic scattering of 31- Mev He/sup 3/ ions on Be, Al, Cu, Sn/sup (nat)/, Sn/sup 120/ and Bi were measured in the angular range of approximately 10 to 120 deg in the center-of-mass system. Thin selfsupporting foil targets were chosen to span the parameter A/sup 1/3/, where A is the target mass number. The first excited states of the isotopes of these elements had sufficient energy separation from the ground state to enable elastic scattering to be resolved from inelastic scattering. The detection system, consisting of CsI(Tl) scintillation crystals, was capable of 3% pulse- height resolution and 1 degree angular resolution. Characteristically, the light- element angular distributions show strong diffraction effects. The differential cross section divided by the Rutherford cross section decreases exponentially at large angles for the heavy elements, and the differential cross sections break away from Rutherford behavior at angles which increase almost linearly with increase of atomic number of the target nucleus. A comparison of the results for natural Sn, and Sn enriched to 85% in Sn/sup 120/, indicated that within the experimental uncertainties over the measured angular interval, there were no pronounced isotopic effects. The data are presented both in tabular and graphical form to allow detailed comparison with theory. (auth)

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Pages: 31

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  • Other Information: Orig. Receipt Date: 31-DEC-63

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  • Report No.: UCRL-9996
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 4759622
  • Archival Resource Key: ark:/67531/metadc1034547

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Office of Scientific & Technical Information Technical Reports

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  • December 31, 1961

Added to The UNT Digital Library

  • Oct. 18, 2017, 7:39 a.m.

Description Last Updated

  • June 8, 2018, 6:28 p.m.

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Igo, G.; Vidal, J. G. & Markowitz, S. S. Elastic Scattering of 31-Mev He$sup 3$ Ions From Several Elements, report, December 31, 1961; [California]. (digital.library.unt.edu/ark:/67531/metadc1034547/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.