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.
Techniques for production and detection of 23S positronium / S. Mariazzi, R. Caravita, A. Vespertini, A. Camper, B. Rienacker, R.S. Brusa, M. Antonello, A. Belov, G. Bonomi, M. Caccia, F. Castelli, G. Cerchiari, D. Comparat, G. Consolati, A. Demetrio, D. Noto, M. Doser, M. Fani, J. Fesel, S. Gerber, A. Gligorova, F. Guatieri, P. Hackstock, S. Haider, A. Hinterberger, A. Kellerbauer, O. Khalidova, D. Krasnicky, V. Lagomarsino, P. Lebrun, C. Malbrunot, V. Matveev, S.R. Muller, G. Nebbia, P. Nedelec, M. Oberthaler, E. Oswald, D. Pagano, L. Penasa, V. Petracek, F. Prelz, M. Prevedelli, J. Robert, O.M. Rohne, A. Rotondi, H. Sandaker, R. Santoro, G. Testera, I.C. Tietje, E. Widmann, T. Wolz, P. Yzombard, C. Zimmer, N. Zurlo. - In: ACTA PHYSICA POLONICA A. - ISSN 0587-4246. - 137:2(2020), pp. 91-95. ((Intervento presentato al 15. convegno Workshop on Slow Positron Beam Techniques and Applications tenutosi a Prague nel 2019 [10.12693/APhysPolA.137.91].
Techniques for production and detection of 23S positronium
F. Castelli;F. Prelz;
2020
Abstract
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.
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