Ionization Quenching Factor measurement of 1 keV to 25 keV protons in Isobutane gas mixtureBenjamin Tampon, Daniel Santos, Olivier Guillaudin, Jean-François Muraz, Lena Lebreton, Thibaut Vinchon and Philippe QuerreEPJ Web Conf., 153 (2017) 01014DOI: https://doi.org/10.1051/epjconf/201715301014