Direct measurements of the stopping power for antiprotons of light and heavy targets

S. P. Møller, E. Uggerhøj, H. Bluhme, H. Knudsen, U. Mikkelsen, K. Paludan, E. Morenzoni

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

Measurements of antiproton stopping powers around the stopping-power maximum are presented for targets of AI, Si, Ti, Cu, Ag, Ta, Pt, and Au. The Low Energy Antiproton Ring antiproton beam of 5.9 MeV is degraded to 50-700 keV, and the energy loss is found by measuring the antiproton velocity before and after the target. Target thicknesses have been determined accurately by weighing and Rutherford backscattering techniques. The antiproton stopping powers are found to be reduced by around 35% for both light and heavy elements near the electronic stopping-power maximum as compared to the equivalent proton stopping power. The antiproton stopping powers and the Barkas effect; that is, the difference in stopping power between protons and antiprotons is compared to theoretical estimates, based on a harmonic-oscillator model and an electron-gas model, and good agreement is obtained.

Original languageEnglish
Pages (from-to)2930-2939
Number of pages10
JournalPhysical Review A
Volume56
Issue number4
Publication statusPublished - 1997

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stopping power
antiprotons
target thickness
protons
light elements
heavy elements
harmonic oscillators
electron gas
backscattering
energy dissipation
rings
estimates
electronics

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Atomic and Molecular Physics, and Optics

Cite this

Møller, S. P., Uggerhøj, E., Bluhme, H., Knudsen, H., Mikkelsen, U., Paludan, K., & Morenzoni, E. (1997). Direct measurements of the stopping power for antiprotons of light and heavy targets. Physical Review A, 56(4), 2930-2939.

Direct measurements of the stopping power for antiprotons of light and heavy targets. / Møller, S. P.; Uggerhøj, E.; Bluhme, H.; Knudsen, H.; Mikkelsen, U.; Paludan, K.; Morenzoni, E.

In: Physical Review A, Vol. 56, No. 4, 1997, p. 2930-2939.

Research output: Contribution to journalArticle

Møller, SP, Uggerhøj, E, Bluhme, H, Knudsen, H, Mikkelsen, U, Paludan, K & Morenzoni, E 1997, 'Direct measurements of the stopping power for antiprotons of light and heavy targets', Physical Review A, vol. 56, no. 4, pp. 2930-2939.
Møller SP, Uggerhøj E, Bluhme H, Knudsen H, Mikkelsen U, Paludan K et al. Direct measurements of the stopping power for antiprotons of light and heavy targets. Physical Review A. 1997;56(4):2930-2939.
Møller, S. P. ; Uggerhøj, E. ; Bluhme, H. ; Knudsen, H. ; Mikkelsen, U. ; Paludan, K. ; Morenzoni, E. / Direct measurements of the stopping power for antiprotons of light and heavy targets. In: Physical Review A. 1997 ; Vol. 56, No. 4. pp. 2930-2939.
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