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Wettig, K. Livingston, K. Spieker, L. Heijkenskj\\\"old, M. Bashkanov, M. Biroth, M. Korolija, M. Ostrick, M. Thiel, M. Wolfes, N. Borisov, N. K. Walford, N. Zachariou, O. Steffen, P. Achenbach, P. Adlarson, P. B. Otte, P. Drexler, P. Pedroni, P. P. Martel, R. Beck, R. Miskimen, S. Abt, S. Costanza, S. Fegan, S. Gardner, S. J. D. Kay, S. Lutterer, S. Wagner, T. Rostomyan, T. Strub, V. L. Kashevarov, V. Sokhoyan, W. Gradl, W. J. Briscoe, Yu. A. Usov, Z. Ahmed","submitted_at":"2022-11-17T17:29:38Z","abstract_excerpt":"We report a first measurement of the double-polarisation observable, $C_{x'}$, in $\\pi^+$ photoproduction off the proton. The $C_{x'}$ double-polarisation observable represents the transfer of polarisation from a circularly polarised photon beam to the recoiling neutron. The MAMI circularly polarised photon beam impinged on a liquid deuterium target cell, with reaction products detected in the Crystal Ball calorimeter. 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