Fauseweh, B.Groitl, F.Keller, T.Rolfs, K.Tennant, D. A.Habicht, K.Uhrig, G. S.2017-01-242017-01-242017-01-24201610.1103/PhysRevB.94.180404https://infoscience.epfl.ch/handle/20.500.14299/133651WOS:000387534000001In this Rapid Communication we investigate the time dependence of the gap mode of copper nitrate at various temperatures. We combine state-of-the-art theoretical calculations with high precision neutron resonance spin-echo measurements to understand the anomalous decoherence effects found previously in this material. It is shown that the time domain offers a complementary view on this phenomenon, which allows us to directly compare experimental data and theoretical predictions without the need of further intensive data analysis, such as (de)convolution.text::journal::journal article::research article