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We measure temperature dependent quasiparticle fluctuations in a small Alvolume, embedded in a NbTiN superconducting microwave resonator. The resonatordesign allows for read-out close to equilibrium. By placing the Al film on amembrane, we enhance the fluctuation level and separate quasiparticle fromphonon effects. When lowering the temperature, the recombination time saturatesand the fluctuation level reduces a factor $\sim$100. From this we deduce thatthe number of free quasiparticles is still thermal. Therefore, the theoretical,inverse relation between quasiparticle number and recombination time is invalidin this experiment. This is consistent with quasiparticle trapping, whereon-trap recombination limits the observed quasiparticle lifetime.

Strong Reduction of Quasiparticle Fluctuations in a Superconductor due to Decoupling of the Quasiparticle Number and Lifetime