ACTA

Techniques for Production and Detection of 2³S Positronium

S. Mariazzi^{a, b}, R. Caravita^c, A. Vespertini^a, A. Camper^c, B. Rienacker^c, R.S. Brusa^{a, b}, M. Antonello^{d, e}, A. Belov^f, G. Bonomi^{g, h}, M. Caccia^{d, e}, F. Castelli^{d, i}, G. Cerchiari^j, D. Comparat^k, G. Consolati^{l, d}, A. Demetrio^{m, j}, Di Noto^{n, o}, M. Doser^c, M. Fanì^{c, n, o}, J. Fesel^c, S. Gerber^c, A. Gligorova^p, F. Guatieri^{a, b}, P. Hackstock^p, S. Haider^c, A. Hinterberger^c, A. Kellerbauer^j, O. Khalidova^c, D. Krasnicky^o, V. Lagomarsino^{n, o}, P. Lebrun^q, C. Malbrunot^{c, p}, V. Matveev^{f, r}, S.R. Muller^m, G. Nebbia^s, P. Nedelec^q, M. Oberthaler^m, E. Oswald^c, D. Pagano^{g, h}, L. Penasa^{a, b}, V. Petracek^t, F. Prelz^d, M. Prevedelli^u, J. Robert^k, O.M. Røhne^v, A. Rotondi^{h, w}, H. Sandaker^v, R. Santoro^{d, e}, G. Testera^o, I.C. Tietje^c, E. Widmann^p, T. Wolz^c, P. Yzombard^j, C. Zimmer^{c, j, x}, N. Zurlo^{h, y}
^aDepartment of Physics, University of Trento, via Sommarive 14, 38123 Povo, Trento, Italy
^bTIFPA/INFN Trento, via Sommarive 14, 38123 Povo, Trento, Italy
^cPhysics Department, CERN, 1211 Geneva 23, Switzerland
^dINFN Milano, via Celoria 16, 20133 Milano, Italy
^eDepartment of Science, University of Insubria, Via Valleggio 11, 22100 Como, Italy
^fInstitute for Nuclear Research of the Russian Academy of Science, Moscow 117312, Russia
^gDepartment of Mechanical and Industrial Engineering, University of Brescia, via Branze 38, 25123 Brescia, Italy
^hINFN Pavia, via Bassi 6, 27100 Pavia, Italy
ⁱDepartment of Physics ``Aldo Pontremoli'', University of Milano, via Celoria 16, 20133 Milano, Italy
^jMax Planck Institute for Nuclear Physics, Saupfercheckweg 1, 69117 Heidelberg, Germany
^kLaboratoire Aime Cotton, Université Paris-Sud, ENS Paris Saclay, CNRS, Université Paris-Saclay, 91405 Orsay Cedex, France
^lDepartment of Aerospace Science and Technology, Politecnico di Milano, via La Masa 34, 20156 Milano, Italy
^mKirchhoff Institute for Physics, Heidelberg University, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany
ⁿDepartment of Physics, University of Genova, via Dodecaneso 33, 16146 Genova, Italy
^oINFN Genova, via Dodecaneso 33, 16146 Genova, Italy
^pStefan Meyer Institute for Subatomic Physics, Austrian Academy of Sciences, Boltzmanngasse 3, 1090 Vienna, Austria
^qInstitute of Nuclear Physics, CNRS/IN2p3, University of Lyon 1, 69622 Villeurbanne, France
^rJoint Institute for Nuclear Research, Dubna 141980, Russia
^sINFN Padova, via Marzolo 8, 35131 Padova, Italy
^tCzech Technical University, Prague, Brehova 7, 11519 Prague 1, Czech Republic
^uUniversity of Bologna, Viale Berti Pichat 6/2, 40126 Bologna, Italy
^vDepartment of Physics, University of Oslo, Sem Sælandsvei 24, 0371 Oslo, Norway
^wDepartment of Physics, University of Pavia, via Bassi 6, 27100 Pavia, Italy
^xDepartment of Physics, Heidelberg University, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany
^yDepartment of Civil, Environmental, Architectural Engineering and Mathematics, University of Brescia, via Branze 43, 25123 Brescia, Italy

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In this work, we show recent measurements of 2³S long-lived positronium production via spontaneous decay from the 3³P level. The possibility to tune the velocity of the 2³S positronium, excited following this scheme, is presented. In the light of these results, we discuss the use of the 3³P→2³S transition to realize a monochromatic pulsed 2³S positronium beam with low angular divergence. Preliminary tests of 2³S beam production are presented. The possibility to overcome the natural 3³P→2³S branching ratio via stimulated emission, and thus increasing the intensity of the 2³S source, is also shown. A position-sensitive detector for a pulsed beam of positronium, with spatial resolution of ~90 μm, is finally described in view of its possible application for the spatial characterization of the 2³S beam.

DOI:10.12693/APhysPolA.137.91
PACS numbers: 37.20.+j, 36.10.Dr, 78.70.Bj