Integral experiment on the metal 238U spherical assembly with a 14 MeV neutron source

The neutron-physical calculation of blanket zones of thermonuclear reactors (TNR) constitute an important element of TNR designing. Basic functional blanket zones - this is the first wall, breeding zone on 14-MeV neutrons and nuclear fuel reprocessing zone. Nowadays in the TNR hybrid conception 238U is considered as the most effective for breeding on 14-MeV neutrons. The correctness of comparing the results of integral neutron-physical experimental with 14-MeV neutron source and one-dimensional calculations is discussed. The experimental procedure which permits to obtain integrated by theta polar angle spectral-sensitive functionals and take into account therefore the two-dimensionality effect connected with energy-angular dependence and anisotropy of neutron source yield. This technique is used in the experiment with metallic 238U spherical assembly and with 14-MeV neutron source. The reaction rates of activation of threshold detectors 115In(n',n), 103Rh(n',n), 19F(n,2n) and 65Cu(n,2n) have been measured. The experimental results have been compared with one-dimensional calculation realized by the Blank program. The difference between the calculational and experimental results for 115In(n',n) and 103Rh(n',n) - 1.5 times. The conclusion is drawn that the calculational program unsatisfactorily describes the secondary neutrons spectrum in the uranium assembly