Annihilation of low energy antiprotons in silicon

• DOI: 10.48550/arxiv.1311.4982
• Publication Date: 2013-01-01
• Authors: S. Aghion; O. Ahlén; A. Belov; G. Bonomi; P. Bräunig; J. Bremer; R.S. Brusa; G. Burghart; L. Cabaret; M. Caccia; C. Canali; R. Caravita; F. Castelli; G. Cerchiari; S. Cialdi; D. Comparat; G. Consolati; J.H. Derking; S. Di Domizio; L. Di Noto; M. Doser; A. Dudarev; R. Ferragut; A. Fontana; P. Genova; M. Giammarchi; A. Gligorova; S. Gninenko; S. Haider; J. Harasimowicz; T. Huse; J. E. Jordan; L. V. Jørgensen; T. Kaltenbacher; A. Kellerbauer; A. Knecht; D. Krasnický; V. Lagomarsino; Alice Magnani; S. Mariazzi; V. Matveev; F. Moia; G. Nebbia; P. Nédélec; N. Pacifico; V. Petráček; F. Prelz; M. Prevedelli; C. Regenfus; C. Riccardi; O. Røhne; A. Rotondi; H. Sandaker; A. Sosa; M.A. Subieta Vásquez; M. Špaček; G. Testera; Carsten Welsch; S. Zavatarelli
• Keywords: Antiproton; Antihydrogen; Annihilation; Bar (unit)

The goal of the AE$\mathrm{\bar{g}}$IS experiment at Antiproton Decelerator (AD) CERN, is to measure directly Earth's gravitational acceleration on antimatter. To achieve this goal, collaboration will produce a pulsed, cold (100 mK) antihydrogen beam with velocity few 100 m/s and magnitude vertical deflection from straight path. final position falling be detected by sensitive detector. This detector consist an active silicon part, where annihilations take place, followed emulsion part. Together, they allow 1$%$ precision measurement $\bar{g}$ about 600 reconstructed time tagged annihilations. We present here, best our knowledge, first direct antiproton annihilation in segmented sensor, step towards designing for experiment. also comparison Monte Carlo simulations (GEANT4) energies below 5 MeV