We propose to perform gamma-ray spectroscopy studies of 43-44-45Ca isotopes, populated via the 42-43-44Ca(n,gamma) thermal-neutron-capture reactions with the FIPPS instruments at ILL, equipped with an array of LaBr3 detectors. The aim of the experiment is to fully characterize the observed nuclear levels through angular correlations and polarization measurements of the emitted gamma rays and to determine their lifetimes using fast timing techniques. The final goal is to investigate the interplay between multi-particle-multi-hole shell-model configurations and quasi-particle-phonon coupled states in open-shell Ca nuclei. These measurements will be complementary to the results already obtained by this collaboration on 41-47-49Ca, studied in the previous EXILL-FATIMA campaign at ILL, providing a complete picture of the evolution of nuclear structure of Ca isotopes between two doubly-closed shells.