Online optical refractive index measurement in research reactor coreGary Fourneau, Marion Agoyan, Guy Chemol, Ayoub Ladaci, Hicham Maskrot, Christophe Destouches, Damien Fourmentel, Sylvain Girard and Aziz BoukenterEPJ Web Conf., 253 (2021) 04020DOI: https://doi.org/10.1051/epjconf/202125304020