Physicists have succeeded in confirming one of the theoretical aspects of quantum physics: Subatomic objects switch between particle and wave states when observed, while remaining in a dual state beforehand. Now, Dr. Andrew Truscott of the Australian National University has reported the same thing in Nature Physics, but this time using a helium atom, rather than a photon.

http://www.iflscience.com/physics/measurement-rules-quantum-...

The published details are here http://www.nature.com/nphys/journal/vaop/ncurrent/full/nphys...