| Popis: |
The thermal neutron cross-section and the resonance integral of the 165 Ho(n,γ) 166g Ho reaction have been measured by the activation method using a 197 Au(n,γ) 198 Au monitor reaction as a single comparator. The high-purity natural Ho and Au foils with and without a cadmium shield case of 0.5 mm thickness were irradiated in a neutron field of the Pohang neutron facility. The induced activities in the activated foils were measured with a calibrated p-type high-purity Ge detector. The correction factors for the γ-ray attenuation ( F g ), the thermal neutron self-shielding ( G th ), the resonance neutron self-shielding ( G epi ) effects, and the epithermal neutron spectrum shape factor ( α ) were taken into account. The thermal neutron cross-section for the 165 Ho(n,γ) 166g Ho reaction has been determined to be 59.7 ± 2.5 barn, relative to the reference value of 98.65 ± 0.09 barn for the 197 Au(n,γ) 198 Au reaction. By assuming the cadmium cut-off energy of 0.55 eV, the resonance integral for the 165 Ho(n,γ) 166g Ho reaction is 671 ± 47 barn, which is determined relative to the reference value of 1550 ± 28 barn for the 197 Au(n,γ) 198 Au reaction. The present results are, in general, good agreement with most of the previously reported data within uncertainty limits. |
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