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Antiproton stopping power in He in the energy range 1–900 keV and the Barkas effect

2004; Elsevier BV; Volume: 599; Issue: 3-4 Linguagem: Inglês

10.1016/j.physletb.2004.08.040

1873-2445

E. Lodi Rizzini, A. Bianconi, M.P. Bussa, M. Corradini, A. Donzella, M. Leali, L. Venturelli, N. Zurlo, M. Bargiotti, A. Bertin, M. Bruschi, M. Capponi, S. De Cecco, R. Donà, L. Fabbri, P. Faccioli, B. Giacobbe, F. Grimaldi, I. Massa, M. Piccinini, Nicola Semprini Cesari, R. Spighi, S. Vecchi, M. Villa, A. Vitale, À. Zoccoli, O.E. Gorchakov, G.B. Pontecorvo, A.M. Rozhdestvensky, V.I. Tretyak, M. Poli, C. Guaraldo, C. Curceanu, F. Balestra, L. Busso, О. Денисов, L. Ferrero, R. Garfagnini, A. Grasso, A. Maggiora, G. Piragino, F. Tosello, G. Zosi, G. V. Margagliotti, L. Santi, S. Tessaro,

Mass Spectrometry Techniques and Applications

The p¯ stopping power in helium from 1 keV kinetic energy is evaluated. Contrary to the effect observed around and below the maximum, Obelix data indicate a p¯ stopping power higher than that for proton, the difference being of the order of 15±5% at ≈700 keV. The result contributes to assert the fundamental difference between p¯ stoppings in the simplest gases (He, H2) and in solid targets below some MeV.