Strong interaction and mass measurements using antiprotonic atoms

P. Roberson, T. King, R. Kunselman, J. Miller, R. J. Powers, P. D. Barnes, R. A. Eisenstein, R. B. Sutton, W. C. Lam, C. R. Cox, M. Eckhause, J. R. Kane, A. M. Rushton, W. F. Vulcan, and R. E. Welsh
Phys. Rev. C 16, 1945 – Published 1 November 1977
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Abstract

X-ray transition energies of antiprotonic atoms formed in targets of Li6, Li7, C, Si, P, Fe, Y, Zr, Cs, and Yb have been measured. Level shifts and widths due to the strong interaction were determined. A phenomenological fit to the data using an optical-model potential proportional to the nuclear matter density and to an effective p¯-nucleus s-wave scattering length yielded [(0.85±0.38)+i(2.66±0.28)] fm for the effective scattering length. In addition, the mass of the antiproton was determined to be 938.229 ± 0.049 MeV from the observed energies of the p¯ x-ray transitions unperturbed by the strong interaction.

NUCLEAR REACTIONS, hadronic atoms. Measured antiprotonic atom x-ray transition energies; determined strong interaction shifts and widths; deduced effective scattering length; deduced antiproton mass.

  • Received 2 May 1977

DOI:https://doi.org/10.1103/PhysRevC.16.1945

©1977 American Physical Society

Authors & Affiliations

P. Roberson*, T. King, and R. Kunselman

  • University of Wyoming, Laramie, Wyoming 82071

J. Miller and R. J. Powers

  • California Institute of Technology, Pasadena, California 91125

P. D. Barnes, R. A. Eisenstein, and R. B. Sutton

  • Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213

W. C. Lam§

  • Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061

C. R. Cox, M. Eckhause, J. R. Kane, A. M. Rushton, W. F. Vulcan, and R. E. Welsh

  • College of William and Mary, Williamsburg, Virginia 23185

  • *A thesis submitted to the Department of Physics and Astronomy of the University of Wyoming in partial fulfillment of requirements for the degree of Doctor of Philosophy. Present address: Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061.
  • Present address: Los Alamos Scientific Laboratory, Los Alamos, New Mexico 87545.
  • Present address: Lawrence Berkeley Laboratory, Berkeley, California 94720.
  • §Present address: Radiation Oncology Physics, Johns Hopkins Hospital, Baltimore, Maryland 21200.
  • Present address: Department of Radiology, University of Maryland Hospital, Baltimore, Maryland 21201.
  • Present address: University of Massachusetts, Amherst, Massachusetts 01002.

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Vol. 16, Iss. 5 — November 1977

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