1. Absorbing rod intended to be introduced into the core of a nuclear reactor cooled by a fluid in order to reduce the reactivity, the said rod comprising a rod body (14, 14a, 14b, 14c) containing an absorbing part (18) and a rod head (12, 12a, 12b, 12c) by means of which the rod body may be suspended from a guide mechanism (13) capable of controlling the raising and the lowering of the absorbing rod in the core as well as the uncoupling of the absorbing rod, permitting the fall of the latter into the core, characterized in that the rod body is movable relative to the rod head and connected to the latter by means for linking by lifting (15, 15a, 15b, 15c), the effect of which, combined with that of the hydraulic resistance of the rod body (14, 14a, 14b, 14c) causes a well-defined relative position between the rod body and the rod head, to correspond to each value of the flow rate of the fluid in the core, this position of the rod body being the higher, that is to say the body being closer to the head, the greater the flow rate.
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