P̄D̄ 4 and p He annihilation cross sections at very low energy

Agnello, Michelangelo; Balestra, F.; Bendiscioli, G.; Bertin, A.; Bianconi, A.; Bonomi, G.; Botta, E.; Bressani, T.; Bruschi, M.; Bussa, M.P.; Busso, L.; Calvo, D.; Capponi, M.; Cerello, P.; Cicalò, C.; Corradini, M.; Costa, S.; D'Isep, F.; De Castro, S.; Denisov, O.Y.; Donzella, A.; Donà, R.; Feliciello, A.; Ferrero, L.; Filippi, A.; Fontana, A.; Galli, D.; Garfagnini, R.; Gastaldi, U.; Giacobbe, B.; Gianotti, P.; Gorchakov, O.E.; Grasso, A.; Guaraldo, C.; Iazzi, Felice; Lanaro, A.; Lodi Rizzini, E.; Lucherini, V.; Marcello, S.; Marconi, U.; Masoni, A.; Massa, I.; Mauro, S.; Minetti, Bruno; Mirfakhrai, N.; Montagna, P.; Panzarasa, A.; Panzieri, D.; Petrascu, C.; Piccinini, M.; Poli, M.; Prakhov, S.N.; Puddu, G.; Ricci, R.A.; Rotondi, A.; Rozhdestvensky, A.M.; Salvini, P.; Semprini Cesari, N.; Serci, S.; Spighi, R.; Tessaro, S.; Tosello, F.; Tretyak, V.I.; Usai, G.; Vagnoni, V.; Vannucci, L.; Vecchi, S.; Venturelli, L.; Villa, M.; Vitale, A.; Zenoni, A.; Zoccoli, A.

P̄D̄ 4 and p He annihilation cross sections at very low energy

Abstract

The p̄D and p̄ 4 He total annihilation cross sections have been measured with the Obelix apparatus at LEAR at, respectively, three and two values of the p incident momentum between 70 MeV/c and 36 MeV/c. The values of the p̄D annihilation cross section, at such low energies, are in agreement with a surprising result obtained in a recent low statistics measurement of the antiprotonic deuterium K α X-rays [M. Augsburger et al., Phys. Lett. B 461 (1999) 417] (see following article), concerning the unexpected narrow width of the antiprotonic deuterium Is leve

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Last time updated on 10/07/2013