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The time-dependent phase change of x rays after transmission through a samplehas been determined experimentally. We used an x-ray interferometer with areference sample containing sharp nuclear resonances to prepare aphase-controlled x-ray beam. A sample with similar resonances was placed in thebeam but outside of the interferometer; hence our use of the term``exo-interferometric.'' We show that the phase change of the x rays due to thesample can be uniquely determined from the time-dependent transmittedintensities. The energy response of the sample was reconstructed from the phaseand the intensity data with a resolution of 23neV.Comment: 4 pages, 4 figure

Exo-interferometric phase determination in nuclear resonant scattering