Granit - A 2nd-generation gravitational neutron spectrometer

The existence of quantum states of matter in the gravitational field has been demonstrated for the very first time at the ILL by a series of ground-breaking experiments with ultracold neutrons (UCN). The GRANIT is the follow-up project based on a second-generation UCN gravitational spectrometer with ultra-high energy resolution. It will provide more accurate studies of/with the quantum states as well as measurements of the resonant transitions between them. It will benefit from a dedicated UCN source delivering UCN to GRANIT with no significant dilution of the phase-space density.


Particle physics and fundamental interactions, e.g.:

  • refined measurement of the electrical charge of the neutron ; Spin-dependent or spin-independent short-range forces ; The search for the axion ; The search for other additional forces beyond the standard model

Foundations of quantum mechanics, e.g. loss of quantum coherence
Solid-state physics
Experimental techniques and their possible technological applications.

A view of the instrument housing

By 2009, the instrument GRANIT was being built in the reactor hall of the ILL. We see here its housing located on the left side of the guide shielding and close to the reactor wall.