Large-momentum-transfer Bragg interferometer with strontium atoms

We report on an atom interferometer based on Bragg diffraction in a fountain of alkaline-earth-metal atoms, namely Sr88. We demonstrate large momentum transfer to the atoms up to eight photon recoils and the use of the interferometer as a gravimeter with a sensitivity δg/g=4×10−8. Thanks to the special characteristics of strontium atoms for precision measurements, this result introduces alternate possibilities for experiments in fundamental and applied physics.