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

Journal Article · Wed Oct 01 04:00:00 EDT 1997 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.56.2930· OSTI ID:632576

Bluhme, H; Knudsen, H; Mikkelsen, U; Paludan, K ^[1]; Morenzoni, E ^[2]

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1. Institute of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C (Denmark)
2. Paul Scherrer Institute, CH-5232 Villigen PSI (Switzerland)

Measurements of antiproton stopping powers around the stopping-power maximum are presented for targets of Al, Si, Ti, Cu, Ag, Ta, Pt, and Au. The Low Energy Antiproton Ring antiproton beam of 5.9 MeV is degraded to 50{endash}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{percent} 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. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 632576
• Journal Information: Physical Review A, Journal Name: Physical Review A Journal Issue: 4 Vol. 56; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ALUMINIUM
ANTIPROTON BEAMS
COPPER
GOLD
HADRONIC ATOMS
MEV RANGE 01-10
PLATINUM
PROTONS
SILICON
SILVER
STOPPING POWER
TANTALUM
TITANIUM