The resolution limit of the detector on the base of the magnetic adiabatic calorimeter operating in the region of the ferromagnetic transition

The energy resolution of the detector on the base of the magnetic adiabatic calorimeter (MAC) operating in the region of the ferromagnetic transition has been estimated on the basis of the Ginzburg-Landau theory. It is assumed that the MAC is set into operating position at low temperature by the adiabatic demagnetisation method. The magnetic response caused by the energy release at a particle entering is detected by SQUID. The estimation of the system sensibility demonstrates the feasibility of the application of the MAC as a weak interacting particles detector.