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  • Producing long-lived \(2^3\text{S}\) Ps via \(3^3\text{P}\) laser excitation in magnetic and electric fields
    Aghion, S; Amsler, C; Antonello, M; Belov, A; Bonomi, G; Brusa, R S; Caccia, M; Camper, A; Caravita, R; Castelli, F; Cerchiari, G; Comparat, D; Consolati, G; Demetrio, A; L Di Noto; Doser, M; Evans, C; Fani, M; Ferragut, R; Fesel, J; Fontana, A; Gerber, S; Giammarchi, M; Gligorova, A; Guatieri, F; Hackstock, P; Haider, S; Hinterberger, A; Holmestad, H; Kellerbauer, A; Khalidova, O; Krasnicky, D; Lagormarsino, V; Lansonneur, P; Lebrun, P; Malbrunot, C; Mariazzi, S; Marton, J; Matveev, V; Mazzotta, Z; Muller, S R; Nebbia, G; Nedelec, P; Oberthaler, M; Pagano, D; Penasa, L; Petracek, V; Prelz, F; Prevedelli, M; Rienaecker, B; Robert, J; Rohne, O M; Rotondi, A; Sandacker, H; Santoro, R; Smestad, L; Sorrentino, F; Testera, G; Tietje, I C; Vujanovic, M; Widmann, E; Yzombard, P; Zimmer, C; Zmeskal, J; Zurlo, N; the AEgIS collaboration

    arXiv.org, 02/2018
    Paper

    Producing positronium (Ps) in the metastable \(2^3\text{S}\) state is of interest for various applications in fundamental physics. We report here about an experiment in which Ps atoms are produced in this long-lived state by spontaneous radiative decay of Ps excited to the \(3^3\text{P}\) level manifold. The Ps cloud excitation is obtained with a UV laser pulse in an experimental vacuum chamber in presence of guiding magnetic field of 25 mT and an average electric field of 300 V/cm. The indication of the \(2^3\text{S}\) state production is obtained from a novel analysis technique of single-shot positronium annihilation lifetime spectra. Its production efficiency relative to the total amount of formed Ps is evaluated by fitting a simple rate equations model to the experimental data and found to be \( (2.1 \pm 1.3) \, \% \).

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