= Doppler coefficient of reactivity
{c}
{title2=$\alpha_D=\partial\rho/\partial T_f$}
= Doppler reactivity feedback coefficient
{c}
{synonym}
The fuel-temperature derivative of <reactor reactivity> associated with thermal broadening of nuclear resonances, with the other state variables specified. In ordinary uranium-fueled water reactors it is negative: heating the fuel increases effective resonance capture. Its magnitude depends on spectrum, fuel state and resonance self-shielding, so its sign does not determine how its magnitude changes under a lattice redesign.<Reactor glossary by the United States Nuclear Regulatory Commission>[Doppler coefficient entry]{ref}
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