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Thermal-neutron capture cross sections and resonance integrals of the $$^{80}$$Se($$n$$,$$gamma$$)$$^{rm 81m,81g}$$Se reactions

Nakamura, Shoji  ; Furutaka, Kazuyoshi  ; Harada, Hideo   ; Kato, Toshio*

Thermal-neutron capture cross-sections ($$sigma$$$$_{rm 0m,g}$$) and resonance integrals ($$I_{rm 0m,g}$$) leading to ground and isomeric states of $$^{81}$$Se were measured by the activation method. Samples of high purity (99.99%) selenium oxide were irradiated in a rotary specimen rack at the research reactor of Rikkyo University. The irradiation of a cadmium-shielded sample was also conducted to obtain $$I_{rm 0m,g}$$. Wires of Co/Al and Au/Al alloys, which have different sensitivities to neutrons in thermal and epithermal energy regions, were irradiated to monitor thermal neutron fluxes and epithermal components at the same position of one of the rack. A high purity Ge detector was used to measure the $$gamma$$ rays emitted from the irradiated samples and wires, and reaction rates were calculated from $$gamma$$-ray yields. On the basis of Westcott's convention, the cross-sections were obtained as follows: $$sigma_{rm 0,m}$$ = 0.057$$pm$$0.003 b and $$I_{rm 0,m}$$=0.186 $$pm$$ 0.014 b leading to $$^{rm 81m}$$Se, $$sigma_{rm 0,g}$$ = 0.536 $$pm$$ 0.046 b and $$I_{rm 0m,g}$$ = 0.867 $$pm$$ 0.102 b leading to $$^{rm 81g}$$Se.

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Category:Nuclear Science & Technology

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