Measuring GBAR with Emulsion Detector

Ariga, T.; Aghion, Stefano; Ahlen, O.; Amsler, C.; Ariga, A.; Belov, A. S.; Berggren, K.; Bonomi, G.; Braunig, P.; Bremer, J.; Brusa, R. S.; Cabaret, L.; Canali, C.; Caravita, R.; Castelli, F.; Cerchiari, G.; Cialdi, S.; Comparat, D.; Consolati, Giovanni; Derking, H.; Di Domizio, S.; Di Noto, L.; Doser, M.; Dudarev, A.; Ereditato, A.; Ferragut, RAFAEL OMAR; Fontana, A.; Genova, P.; Giammarchi, M.; Gligorova, A.; Gninenko, S. N.; Haider, S.; Huse, T.; Jordan, E.; Jorgensen, L. V.; Kaltenbacher, T.; Kawada, J.; Kellerbauer, A.; Kimura, M.; Knecht, A.; Krasniky, D.; Lagomarsino, V.; Lehner, S.; Magnanig, A.; Malbrunot, C.; Mariazzi, S.; Matveev, V. A.; Nebbia, G.; Nedelec, P.; Oberthaler, M. K.; Pacifico, N.; Petracek, V.; Pistillo, C.; Prelz, F.; Prevedelli, M.; Regenfus, C.; Riccardi, C.; Rohne, O.; Rotondi, A.; Sandaker, H.; Scampo, P.; Storet, J.; Subieta Vasquez, M. A.; Spacek, M.; Testerap Widmann, G.; Yzombardj, P.; Zavaterelli, S.; Zmeskal, J.

doi:10.1142/S2010194514602683

The motivation of the AEgIS experiment is to test the universality of free fall with antimatter. The goal is to reach a relative uncertainty of 1% for the measurement of the earth’s gravitational acceleration g on an antihydrogen beam. High vertex position resolution is required for a position detector. An emulsion based detector can measure the annihilation vertex of antihydrogen atoms with a resolution of 1-2 μm, which if realized in the actual experiment will enable a 1% measurement of g with less than 1000 H atoms. Developments and achievements on emulsion detectors for the AEgIS experiment are presented here.