Abstract
For the determination of the mean cross-sections of the 103Rh( n, 2 n) 102, 102 m Rh reactions in the BR-2 reactor, the equivalent fission neutron flux was determined with four reference threshold reactions: 58 Ni(n, p) 58, 58m Co, 27 Al(n, α) 24 Na, 55 Mn(n, 2n) 54 Mn and 58Ni( n, 2 n) 57Ni. The equivalent fission flux, determined with the 58Ni( n, p) 58, 58 m Co reaction, was corrected for “burn-up” of both cobalt isomers. In order to carry out this correction, the thermal flux was determined by irradiation of a dilute cobalt-aluminium alloy, and was 6·99 × 10 12 n cm −2sec −1. 102, 102 m Rh, formed by the ( n, 2 n) reaction, was separated from the high 192Ir activity by precipitating rhodium from a dilute hydrochloric acid solution after addition of mercury(I) chloride. 192Ir was formed by ( n, γ) reaction on iridium, which is always present as an impurity in rhodium sponge. The absolute measurements of 102Rh and of 102 m Rh were performed with a Ge(Li) detector of known detection efficiency. As the effective energies for the 103Rh( n, 2 n) 102, 102 m Rh and the 55Mn( n, 2 n) 54Mn reactions are approximately equal, the cross-sections for the 103Rh( n, 2 n) reactions have been referred to the 55 Mn(n, 2n) ( σ = 0·21 mb) reaction. For the mean cross-sections of the 103Rh( n, 2 n) 102Rh and the 103Rh( n, 2 n) 102 m Rh reactions, values of 0·60 and 0·24 mb respectively have been found.
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