E-viri
Recenzirano
-
Glöggler, L.T; Gusakova, N; Rienäcker, B; Camper, A; Caravita, R; Huck, S; Volponi, M; Wolz, T; Penasa, L; Krumins, V; Gustafsson, F; Auzins, M; Bergmann, B; Burian, P; Brusa, R.S; Castelli, F; Ciuryło, R; Comparat, D; Consolati, G; Doser, M; Graczykowski, Ł; Grosbart, M; Guatieri, F; Haider, S; Janik, M.A; Kasprowicz, G; Khatri, G; Kłosowski, Ł; Kornakov, G; Lappo, L; Linek, A; Malamant, J; Mariazzi, S; Petracek, V; Piwiński, M; Pospisil, S; Povolo, L; Prelz, F; Rangwala, S.A; Rauschendorfer, T; Rawat, B.S; Rodin, V; Røhne, O.M; Sandaker, H; Smolyanskiy, P; Sowiński, T; Tefelski, D; Vafeiadis, T; Welsch, C.P; Zawada, M; Zielinski, J; Zurlo, N
Physical review letters, 2024, Letnik: 132, Številka: 8Journal Article
We report on laser cooling of a large fraction of positronium (Ps) in free-flight by strongly saturating the $1^3S$-$2^3P$ transition with a broadband, long-pulsed 243 nm alexandrite laser. The ground state Ps cloud is produced in a magnetic and electric field-free environment. We observe two different laser-induced effects. The first effect is an increase in the number of atoms in the ground state after the time Ps has spent in the long-lived $3^3P$ states. The second effect is the one-dimensional Doppler cooling of Ps, reducing the cloud's temperature from 380(20) K to 170(20) K. We demonstrate a 58(9) % increase in the coldest fraction of the Ps ensemble.
