Research Overview

October 25, 2016 Published by

Our experimental research is based on two pillars: our neutron interferometer experiments are carry out at the CRC instrument S18 at the high-flux (60 MW) reactor of the Institut Laue-Langevin in Grenoble, France (left). But we also have our very “own” reactor, namely the 250 kW TRIGA reactor at the AtominstitutTU Wien, Vienna Austria (right). There we operate the instrument NepTUn (Neutron Polarimeter TU Wien), which is applied for (polarimetric) experiments where no beam separation is required.

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Interferometry

November 15, 2016 Published by

In the interferometer a beam of neutrons—massive particles—is split by amplitude division, and superposed coherently after passing through different regions of space. During this space-like separation (typically a few centimeters) the neutron wave function can be modified in phase and amplitude in various ways. It can be manipulated via nuclear, magnetic, electric, or gravitational potentials. In the IFMs, neutrons exhibit self-interference, since at most one single neutron propagates through the IFM at a given time.

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S18 – ILL, Grenoble

November 14, 2016 Published by

The CRG C instrument S18 is a perfect crystal thermal neutron interferometer which can also be configured as a high resolution Bonse Hart camera (Ultra Small Angle Scattering). This instrument is used for precise measurement of neutron scattering lengths and (mostly) for studies of the foundations of quantum mechanics.

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NepTUn

November 13, 2016 Published by

Neutron polarimetry, also referred to as  spin-interferometry, established a powerful tool for investigation of fundamental quantum mechanical concepts with massive particles. It has several advantages compared to Mach-Zehnder (perfect crystal) neutron interferometry, such as insensitive to ambient mechanical and thermal disturbances, yielding high phase stability.

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Neutrons Optical Devices

September 22, 2016 Published by

When a neutron beam is exposed to a stationary magnetic field, the motion of its polarization vector—its vector components being the expectation values of the Pauli spin-matrices, is described by the Bloch equation. That precession of the polarization vector about an axis of a magnetic field called Larmor precession, and provides the basis for various neutron optical components of different types.