ACTA

A Method to Produce Linearly Polarized Positrons and Positronium Atoms with the J-PET Detector

Muhsin Mohammed^a,b, P. Białas^a, C. Curceanu^c, E. Czerwiński^a, K. Dulski^a, A. Gajos^a, B. Głowacz^a, M. Gorgol^d, B.C. Hiesmayr^e, B. Jasińska^d, D. Kisielewska^a, G. Korcyl^a, P. Kowalski^f, T. Kozik^a, N. Krawczyk^a, W. Krzemień^g, E. Kubicz^a, M. Pawlik-Niedźwiecka^a, S. Niedźwiecki^a, M. Pałka^a, L. Raczyński^f, J. Raj^a, Z. Rudy^a, N.G. Sharma^a, S. Sharma^a, Shivani^a, M. Skurzok^a, M. Silarski^a, A. Wieczorek^a,h, W. Wiślicki^f, B. Zgardzińska^d, M. Zieliński^a and P. Moskal^a
^aFaculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University, 30-348 Kraków, Poland
^bDepartment of Physics, College of Education for Pure Sciences, University of Mosul, Mosul, Iraq
^cINFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
^dInstitute of Physics, M. Curie-Skłodowska University, 20-031 Lublin, Poland
^eFaculty of Physics, University of Vienna, 1090 Vienna, Austria
^fDepartment of Complex System, National Centre for Nuclear Research, 05-400 Otwock-Świerk, Poland
^gHigh Energy Physics Division, National Centre for Nuclear Research, 05-400 Otwock-Świerk, Poland
^hInstitute of Metallurgy and Materials Science, Polish Academy of Sciences, 30-059 Kraków, Poland

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A method for creating linearly polarized positrons and ortho-positronium (o-Ps) atoms with the J-PET detector is presented. The unique geometry and properties of the J-PET tomography enable one to design a positron source such that the quantization axis for the estimation of the linear polarization of produced o-Ps can be determined on the event by event basis in a direction of the positron motion. We intend to use ²²Na or other β⁺ decay isotopes as a source of polarized positrons. Due to the parity violation in the beta decay, the emitted positrons are longitudinally polarized. The choice of the quantization axis is based on the known position of the positron emitter and the reconstructed position of the positronium annihilation. We show that the J-PET tomography is equipped with all needed components.

DOI: 10.12693/APhysPolA.132.1486
PACS numbers: 41.75.Fr, 41.75.Ht, 77.22.Ej, 36.10.Dr, 85.75.Mm, 87.57.uk