High accuracy measurement of the prompt neutron decay constant in CROCUS using Gamma Noise and bootstrapped uncertainties

We experimentally demonstrate the advantages of gamma detection for noise measurements to determine prompt neutron decay constant α a nuclear reactor using power spectral density (PSD) method, coupled new uncertainty estimation scheme based on bootstrapping. compare relative precision and performed in CROCUS research reactor. The reference experiment employs two large 235U fission chambers, whereas is CeBr3 scintillators. results that superior with respect precision, giving an advantage regards measurement time reach desired levels: budget shows 3.6% 1.3% noise, respectively. Moreover, thanks bootstrapping, reporting full distributions – rather than assuming Gaussian spreads kinetic parameters shown be relevant order provide accurate representation experimental some cases. In addition, we notably discuss lower level discrimination threshold its effect PSDs. Gamma ray cross PSDs exhibit behaviour contrary standard acquisition system, implications. could prove cheaper, more precise, flexible method kinetics.