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Positronium for Antihydrogen Production in the AEGIS Experiment

Consolati, G. (INFN, Milan) ; Aghion, S. (INFN, Milan) ; Amsler, C. (Stefan Meyer Inst. Subatomare Phys.) ; Bonomi, G. (INFN, Pavia) ; Brusa, R.S. (TIFPA-INFN, Trento) ; Caccia, M. (Insubria U., Como) ; Caravita, R. (CERN) ; Castelli, F. (Milan U.) ; Cerchiari, G. (Heidelberg, Max Planck Inst.) ; Comparat, D. (LAC, Orsay) ; Demetrio, A. (Kirchhoff Inst. Phys.) ; Di Noto, L. (INFN, Genoa) ; Doser, M. (CERN) ; Evans, C. (INFN, Milan) ; Fanì, M. (CERN) ; Ferragut, R. (INFN, Milan) ; Fesel, J. (CERN) ; Fontana, A. (INFN, Pavia) ; Gerber, S. (CERN) ; Giammarchi, M. (INFN, Milan) ; Gligorova, A. (Stefan Meyer Inst. Subatomare Phys.) ; Guatieri, F. (TIFPA-INFN, Trento) ; Haider, S. (CERN) ; Hinterberger, A. (CERN) ; Holmestad, H. (Oslo U.) ; Kellerbauer, A. (Heidelberg, Max Planck Inst.) ; Khalidova, O. (CERN) ; Krasnicky, D. (INFN, Genoa) ; Lagomarsino, V. (INFN, Genoa) ; Lansonneur, P. (Lyon, IPN) ; Lebrun, P. (Lyon, IPN) ; Malbrunot, C. (CERN) ; Mariazzi, S. (INFN, Padua) ; Marton, J. (Stefan Meyer Inst. Subatomare Phys.) ; Matveev, V. (Dubna, JINR) ; Mazzotta, Z. (Milan U.) ; Müller, S.R. (Kirchhoff Inst. Phys.) ; Nebbia, G. (INFN, Padua) ; Nedelec, P. (Lyon, IPN) ; Oberthaler, M. (Kirchhoff Inst. Phys.) ; Pacifico, N. (CERN) ; Pagano, D. (INFN, Pavia) ; Penasa, L. (TIFPA-INFN, Trento) ; Petracek, V. (Prague, Tech. U.) ; Prelz, F. (INFN, Milan) ; Prevedelli, M. (U. Bologna (main)) ; Ravelli, L. (TIFPA-INFN, Trento) ; Rienaecker, B. (CERN) ; Robert, J. (LAC, Orsay) ; Røhne, O.M. (Oslo U.) ; Rotondi, A. (Pavia U.) ; Sandaker, H. (Oslo U.) ; Santoro, R. (Insubria U., Como) ; Smestad, L. (Res. Council, Norway) ; Sorrentino, F. (INFN, Genoa) ; Testera, G. (INFN, Genoa) ; Tietje, I.C. (CERN) ; Widmann, E. (Stefan Meyer Inst. Subatomare Phys.) ; Yzombard, P. (Heidelberg, Max Planck Inst.) ; Zimmer, C. (Heidelberg U.) ; Zmeskal, J. (Stefan Meyer Inst. Subatomare Phys.) ; Zurlo, N. (INFM, Brescia)

Published in: Acta Phys.Polon.
Year: 2017
Vol.: A132    Num./Issue: 5
Page No: 1443-1449
Pages: 7
Year: 2017-11 published

Abstract: The primary goal of the Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy (AEGIS) collaboration is to measure for the first time precisely the gravitational acceleration of antihydrogen, H¯ , a fundamental issue of contemporary physics, using a beam of antiatoms. Indeed, although indirect arguments have been raised against a different acceleration of antimatter with respect to matter, nevertheless some attempts to formulate quantum theories of gravity, or to unify gravity with the other forces, consider the possibility of a non-identical gravitational interaction between matter and antimatter. We plan to generate H¯ through a charge-exchange reaction between excited Ps and antiprotons coming from the Antiproton Decelerator facility at CERN. It offers the advantage to produce sufficiently cold antihydrogen to make feasible a measurement of gravitational acceleration with reasonable uncertainty (of the order of a few percent). Since the cross-section of the above reaction increases with n 4 , n being the principal quantum number of Ps, it is essential to generate Ps in a highly excited (Rydberg) state. This will occur by means of two laser excitations of Ps emitted from a nanoporous silica target: a first UV laser (at 205 nm) will bring Ps from the ground to the n = 3 state; a second laser pulse (tunable in the range 1650–1700 nm) will further excite Ps to the Rydberg state.

Web-Page: http://inspirehep.net/record/1643356/files/app132z5p01.pdf

Total numbers of views: 71
Numbers of unique views: 41
DOI: 10.12693/APhysPolA.132.1443
 Record created 2018-01-09, last modified 2018-01-09

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