A ∼100 $\mu$m-resolution position-sensitive detector for slow positronium

C. Amsler , M. Antonello , A. Belov , G. Bonomi , R.S. Brusa , M. Caccia , A. Camper , R. Caravita , F. Castelli , G. Cerchiari , D. Comparat (1) , G. Consolati , A. Demetrio , L. Di Noto , M. Doser , M. Fanì , R. Ferragut , J. Fesel , S. Gerber , M. Giammarchi , A. Gligorova , F. Guatieri , P. Hackstock , S. Haider , A. Hinterberger , A. Kellerbauer , O. Khalidova , D. Krasnický , V. Lagomarsino , P. Lebrun (2) , C. Malbrunot , S. Mariazzi , V. Matveev , S.R. Müller , G. Nebbia , P. Nedelec (2) , M. Oberthaler , E. Oswald , D. Pagano , L. Penasa , V. Petracek , F. Prelz , M. Prevedelli , B. Rienaecker , J. Robert (1) , O.M. Røhne , A. Rotondi , H. Sandaker , R. Santoro , G. Testera , I.C. Tietje , E. Widmann , T. Wolz , P. Yzombard , C. Zimmer , N. Zurlo

1 LAC - Laboratoire Aimé Cotton
2 IPNL - Institut de Physique Nucléaire de Lyon

In this work we describe a high-resolution position-sensitive detector for positronium. The detection scheme is based on the photoionization of positronium in a magnetic field and the imaging of the freed positrons with a Microchannel Plate assembly. A spatial resolution of (88±5)  μm on the position of the ionized positronium –in the plane perpendicular to a 1.0 T magnetic field– is obtained. The possibility to apply the detection scheme for monitoring the emission into vacuum of positronium from positron/positronium converters, imaging positronium excited to a selected state and characterizing its spatial distribution is discussed. Ways to further improve the spatial resolution of the method are presented.

Mots clés: Positronium; Imaging

Domaines: Instrumentations et Détecteurs [physics.ins-det]

C. Amsler, M. Antonello, A. Belov, G. Bonomi, R.S. Brusa, et al.. A ∼100 $\mu$m-resolution position-sensitive detector for slow positronium. Nucl.Instrum.Meth.B, 2019, 457, pp.44-48. ⟨10.1016/j.nimb.2019.07.015⟩. ⟨hal-02290802⟩