科研之友
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摘要
According to the regulation of growing and decay of artificial radioactive nuclide, a formula used to subtract the effect of characteristic gamma-ray of the others to that of measured reaction was deduced. And then the cross sections of Te-120 (n, 2n)Te-119m reaction induced by neutrons around 14 MeV were measured by activation relative to the Nb-93 (n, 2n)Nb-92m. In the process of the cross sections measured to be calculated, it was subtracted that the effect of characteristic gamma-ray of Te-126 (n, P)Sb-126 to that of measured Te-120 (n, 2n)Te-119m reaction using the formula deduced. The experimental results were (689 +/- 37) and (750 +/- 41) mb at the neutron energies of (13.5 +/- 0.3) and (14.6 +/- 0.3) MeV, respectively. Measurements were carried out by gamma-detection using a coaxial HPGe detector. As samples, spectroscopically pure tellurium powder has been used. The fast neutrons were produced by the T(d, n)He-4 reaction. The neutron energies in these measurements were determined by the method of cross-section ratios between Zr-90 (n, 2n) Zr89m+g and Nb-93 (n, 2n) Nb-92m reactions.
