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Study of Neutron Spectra Near the Surfaces of Iron and Water Spheres with 252Cf Sources at Their Centers

“…The neutron spectra near the iron and water spheres were calculated using the KASKAD-620 (176) code, in which the 2804-2003 technique is applied [11]. This calculation technique uses the measurement data obtained with integral neutron detectors and is implemented by functionally simulating the a priori solution and applying an iteration algorithm for searching for a finite solution using the method of minimizing the directed discrepancy.…”

“…Neutron spectra were measured by hydrogen counters according to the techniques from [7][8][9][10] at energies of 0.01-1.5 MeV and by activation and fission detectors at neutron energies of 10 − 10 -18 MeV. The neutron spectrum obtained with activation detectors was calculated using the 2804-2003 method [11]. However, since the neutron flux density in the fields under study was quite low (<1.0 × 10 5 neutrons cm -2 s -1 ), the neutron spectra were measured by using mainly highly sensitive track fission detectors and only a few highly sensitive activation neutron detectors were used.…”

“…6.300 × 10 -10 7.518 × 10 2 69 6.300 × 10 -4 4.381 × 10 0 129 3.600 × 10 0 3.799 × 10 -3 10 8.000 × 10 -10 9.400 × 10 2 70 8.000 × 10 -4 3.650 × 10 0 130 3.800 × 10 0 3.078 × 10 -3 11 1.000 × 10 - …”

Experimental Study of the Deformation of Instantaneous Neutron Spectra from the Fission of 235U Nuclei in Fast-Reactor Core Materials

“…program [15]. The correctness of this reconstruction was assessed by comparing the measured integral cross sections of the nuclear reactions (cross sections σ i = Q i /F, where F is the neutron fluence with which an activation detector is irradiated and Q i is the number of nuclear reactions inside the ith neutron-irradiated detector, are averaged over the reconstructed neutron spectrum) to the same cross sections calculated using both the reconstructed neutron spectrum and the differential cross sections of nuclear reactions available from the program library.…”

Studying Neutron Spectra at the Centers of the Metal Cores of Fast Research Reactors

“…The neutron spectra at the metal-core centers of the fast nuclear reactors were calculated using the KASKAD-620(176) code [10]. The a priori neutron spectrum at the core center was represented in analyti-…”