Projection imaging with ultracold neutrons

Neutron lifetime measured with stored ultracold neutrons.

Cross Section for “Ultracold” Neutrons

Very cold neutrons (typical wavelengths are about 102 Ä) are available by recently developed techniques 2. The features of the scattering of these “ultracold” neutrons are investigated in the present paper discussing a few examples of magnetic scattering. The diffraction of neutrons by the vortex lattice in superconductors is treated as an example of elastic scattering, while in most other case...

Imaging with Polarized Neutrons

Neutrons have zero net electrical charge and can thus penetrate deeply into matter, but their intrinsic magnetic moment makes them highly sensitive to magnetic fields. These properties have been combined with radiographic (2D) and tomographic (3D) imaging methods to provide a unique technique to probe macroscopic magnetic phenomena both within and around bulk matter. Based on the spin-rotation ...

Test of Lorentz invariance with spin precession of ultracold neutrons.

A clock comparison experiment, analyzing the ratio of spin precession frequencies of stored ultracold neutrons and 199Hg atoms, is reported. No daily variation of this ratio could be found, from which is set an upper limit on the Lorentz invariance violating cosmic anisotropy field b perpendicular < 2 x 10(-20) eV (95% C.L.). This is the first limit for the free neutron. This result is also int...

Research Opportunities with Ultracold Neutrons in the United States

We summarize the content, discussions and conclusions of a workshop, “Research Opportunities with Ultracold Neutrons in the US”, held in Santa Fe, NM, on November 6th and 7th, 2009. The primary goal of this workshop was to elucidate physics opportunities for future work using the Los Alamos Ultracold Neutron Source. During the workshop, the physics motivation was reviewed for measurements of th...