Energy resolution of the superconducting detector with the S0S1I1S2NI2S3-structure

In the superconducting detector with the S0S1I1S2NI2S3-structure the internal amplification of quasiparticles takes place due to the process of downconversion of the quasiparticles energy from the gap of a superconductor to the Fermi level of a normal metal. In this paper the formulae for the mean value of the signal and the energy resolution of a superconducting detector with the S0S1I1S2NI2S3-structure for low energy X-ray are derived.