We present measurements of the temperature-dependent momentum distribution of a trapped Fermi gas consisting of ⁴⁰K in the BCS to Bose-Einstein condensation crossover regime. Accompanying theoretical results based upon a simple mean-field ground state are compared to the experimental data. Nonmonotonic effects associated with temperature T arise from the competition between thermal broadening and a narrowing of the distribution induced by the decrease in the excitation gap Δ(T) with increasing T.
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Chen et al. (2006) studied this question.
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