doi:10.1140/epjc/s10052-022-10061-1engDi Luzio, L.Galan, J.Giannotti, M.García Irastorza, I.Jaeckel, J.Lindner, A.Ruz, J.Schneekloth, U.Sohl, L.Thormaehlen, L. J.Vogel, J. K.Probing the axion-nucleon coupling with the next generation of axion helioscopesART-2022-128097A finite axion–nucleon coupling, nearly unavoidable for QCD axions, leads to the production of axions via the thermal excitation and subsequent de-excitation of 57Fe isotopes in the sun. We revise the solar bound on this flux adopting the up to date emission rate, and investigate the sensitivity of the proposed International Axion Observatory IAXO and its intermediate stage BabyIAXO to detect these axions. We compare different realistic experimental options and discuss the model dependence of the signal. Already BabyIAXO has sensitivity far beyond previous solar axion searches via the nucleon coupling and IAXO can improve on this by more than an order of magnitude.2022http://zaguan.unizar.es/record/11219210.1140/epjc/s10052-022-10061-1http://zaguan.unizar.es/record/112192oai:zaguan.unizar.es:112192info:eu-repo/grantAgreement/EC/H2020/788781/EU/Towards the detection of the axion with the International Axion Observatory/IAXOplusThis project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 788781-IAXOplusinfo:eu-repo/grantAgreement/EC/H2020/860881/EU/Revealing how hidden symmetries shape the universe/HIDDeNThis project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 860881-HIDDeNinfo:eu-repo/grantAgreement/ES/MINECO/PID2019-108122GB-C33The European Physical Journal C 82, 2 (2022), 120 [15 pp.]byhttp://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccess