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Barkas effect for antiproton stopping in H2
E Lodi Rizzini1, A Bianconi, M P Bussa
1Dipartimento di Chimica e Fisica per l'Ingegneria e per i Materiali, Università di Brescia, Brescia and INFN, gruppo di Brescia, Brescia, Italy. lodi@bs.infn.it
Physical Review Letters
|October 26, 2002
Summary
Antiproton stopping power in molecular hydrogen was measured and compared to protons. A significant difference was observed, peaking at 21% around 600 keV.
Area of Science:
- Atomic and Molecular Physics
- Plasma Physics
- Materials Science
Background:
- Understanding particle interactions with matter is crucial for various fields.
- Accurate stopping power data is essential for modeling particle transport and energy deposition.
Purpose of the Study:
- To determine the stopping power of molecular hydrogen for antiprotons.
- To compare antiproton stopping power in molecular hydrogen with proton stopping power.
- To investigate the energy dependence of the difference between antiproton and proton stopping powers.
Main Methods:
- Experimental measurement of antiproton energy loss in molecular hydrogen.
- Utilizing antiprotons with kinetic energy above 100 keV.
- Comparison with existing proton stopping power data.
Main Results:
- Antiproton stopping power in molecular hydrogen was measured for energies above 100 keV.
- A positive difference between antiproton and proton stopping powers was observed above approximately 250 keV.
- The maximum difference reached 21% +/- 3% at around 600 keV.
Conclusions:
- The study confirms a notable difference in stopping power between antiprotons and protons in molecular hydrogen.
- The findings provide valuable data for theoretical models of particle-matter interactions.
- The observed difference highlights the importance of considering particle type in energy loss calculations.