Measurements of cascade times of antiprotons in molecular hydrogen and helium

Authors
Bianconi, A Bonomi, G Corradini, M Donzella, A Gomez, G Rizzini, EL Venturelli, L Vilar, R Zenoni, A Bertin, A Bruschi, M Capponi, M De Castro, S Dona, R Galli, D Giacobbe, B Marconi, U Massa, I Piccinini, M Cesari, NS Spighi, R Vagnoni, V Vecchi, S Villa, M Vitale, A Zoccoli, A Cicalo, C De Falco, A Masoni, A Puddu, G Serci, S Usai, G Gorchakov, OE Prakhov, SN Rozhdestvensky, AM Tretyak, VI Poli, M Gianotti, P Guaraldo, C Lanaro, A Lucherini, V Petrascu, C Ableev, VG Ricci, RA Vannucci, L Filippini, V Fontana, A Montagna, P Rotondi, A Salvini, P Mirfakhraee, N Bussa, MP Busso, L Cerello, P Denisov, OY Ferrero, L Garfagnini, R Grasso, A Maggiora, A Panzarasa, A Panzieri, D Tosello, F Botta, E Bressani, T Calvo, D Costa, S D'Isep, F Feliciello, A Filippi, A Marcello, S Agnello, M Iazzi, F Minetti, B Tessaro, S Santi, L
Citation
A. Bianconi et al., Measurements of cascade times of antiprotons in molecular hydrogen and helium, PHYS LETT B, 487(3-4), 2000, pp. 224-228
Citations number
11
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
03702693 → ACNP
Volume
487
Issue
3-4
Year of publication
2000
Pages
224 - 228
Database
ISI
SICI code
0370-2693(20000817)487:3-4<224:MOCTOA>2.0.ZU;2-G
Abstract
The Obelix experiment at CERN collected samples of antiproton annihilations at rest in different gaseous targets, such as hydrogen, deuterium and heli um. We analyze a set of the Obelix data using a new technique for measuring , for the first time, the cascade times independent of the capture energy a nd of the antiproton stopping power. We report on measurements of the casca de times for hydrogen at 3.4, 5.8, 9.8 and 150 mbar and for helium at 8.2, 50 and 150 mbar pressure. An estimate of the antiproton capture energy in h ydrogen is also presented. (C) 2000 Elsevier Science B.V. All rights reserv ed.