A Comprehensive Analysis of Polarized $\gamma $ -ray Beam Data with the HARPO Demonstrator

R. Yonamine (1) , S. Amano , D. Attié (1) , P. Baron (1) , D. Baudin (1) , D. Bernard (2) , P. Bruel (2) , D. Calvet (1) , P. Colas (1) , S. Daté , A. Delbart (1) , M. Frotin (2) , Y. Geerebaert (2) , B. Giebels (2) , D. Götz (3) , P. Gros (2) , S. Hashimoto , D. Horan (2) , T. Kotaka , M. Louzir (2) , Y. Minamiyama , S. Miyamoto , H. Ohkuma , P. Poilleux (2) , I. Semeniouk (2) , P. Sizun (1) , A. Takemoto , M. Yamaguchi , S. Wang (2)

1 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
2 LLR - Laboratoire Leprince-Ringuet
3 AIM (UMR7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation

We investigate the feasibility of gaseous TPC as a telescope and a polarimeter for cosmic gamma-rays, focussing on the energy range from 1 to 100 MeV. Our beam results show the angular resolution can reach a factor of 2 better than that of the Fermi LAT. We also demonstrate polarimetry with a high significance and an excellent dilution factor, for the first time above the pair production threshold and below 1 GeV.

Mots clés: TPC; Polarimetry; Gamma-ray; Saturation; polarization: monitoring; gamma ray: polarization; gamma ray: cosmic radiation; time projection chamber; angular resolution; performance

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

R. Yonamine, S. Amano, D. Attié, P. Baron, D. Baudin, et al.. A Comprehensive Analysis of Polarized $\gamma $ -ray Beam Data with the HARPO Demonstrator. 4th International conference on Technology and Instrumentation in Particle Physics, May 2017, Beijing, China. pp.27-30, ⟨10.1007/978-981-13-1313-4_6⟩. ⟨hal-01863380⟩