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Report No.

Preliminary experiment of neutron capture cross section of Tc-99 with lead slowing-down spectrometer

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The present status of nuclear data for technetium (Tc)-99, which is a well-known fission product (FP), has been reviewed and investigated. And making use of the Kyoto university Lead Slowing-down Spectrometer (KULS), the cross section of the $$^{99}$$Tc (n, $$gamma$$) $$^{100}$$Tc reaction has been measured in the energy range from thermal to keV neutron energy with an Ar-gas proportinal counter. The neutron flux/spectrum has been monitored with a BF$$_{3}$$ proportional counter, and the relative measurement has been normalized to the well-known standard capture cross section value for the $$^{99}$$Tc (n, $$gamma$$) $$^{100}$$Tc reaction at 0.0253 eV. Self-shielding corrections, especially near the resonance peaks, were made by the calculations with the MCNP code. Although the experimental data measured by Chou et al with a lead slowing-down spectrometer are higher in general, the energy dependency is similar to the present measurement. The evaluated data in ENDF/B-VI and JENDL-3.2 are higher near the resonances at 5.6 and 20 eV and above several 100 eV. A lead slowing-down spectrometer was installed coupled to a 46 MeV electron linac at the Research Reactor Institute, Kyoto university (KURRI). Characteristics of the Kyoto University Lead Slowing-down Spectrometer (KULS) were measured and (1)the relation between neutron slowing-down time t($$mu$$s) and energy E(keV) (E=190/t$$^{2}$$ in Bi hole and E=156/t$$^{2}$$ in Pb hole) and (2)the energy resolution ($$sim$$40% in Bi and Pb holes) were experimentally investigated. (3)The neutron energy spectrum in the KULS was also measured by the neutron TOF method. The results obtained by the MCNP code were in general agreement with these experimental ones.



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