Abstract
Stable nuclides exposed to intense neutron fluxes may produce second order reactions by successive capture of two neutrons. This method has been applied in the present work in an attempt to determine the pile neutron capture cross section of three unstable nuclides, namely: Mg27, Si31, and Cr55. A maximum value of 0.04 barn has been obtained for the cross section of Mg27. Assuming that Si32 and Cr56 are long-lived, minimal ratios of 600 and 270 years/barn respectively were obtained for [Formula: see text]
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