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Antiproton slowing down, capture, and decay in low-pressure helium gas

2004; American Physical Society; Volume: 70; Issue: 3 Linguagem: Inglês

10.1103/physreva.70.032501

1538-4446

A. Bianconi, M. Corradini, A. Donzella, M. Leali, E. Lodi Rizzini, L. Venturelli, N. Zurlo, M. Bargiotti, A. Bertin, M. Bruschi, M. Capponi, S. De Cecco, 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, M.P. Bussa, 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,

Cold Atom Physics and Bose-Einstein Condensates

Data on $\overline{p}$ slowing down and capture in helium at 1 and $0.2\phantom{\rule{0.3em}{0ex}}\mathrm{mb}$ at room temperature are presented and compared to the corresponding previously publicated data in molecular hydrogen and deuterium. A Monte Carlo simulation containing a low-energy extrapolation of measured $\overline{p}$ electronic stopping power in helium gas, screened Rutherford collisions, and simple cascade mechanisms is able to reproduce the gross features of the data, but cannot explain some nontrivial details of the measured distributions.