The mechanical design of the BARREL section of the detector CALIFA for R3B-FAIR.E. Casarejos, H. Alvarez-Pol, D. Cortina-Gil, I. Durán, P. Izquierdo, P. Yañez and J.A. VilánEPJ Web of Conferences, 66 (2014) 11037DOI: https://doi.org/10.1051/epjconf/20146611037