New source for ultracold neutrons at the Institut Laue-Langevin

Abstract

A new intense superthermal source for ultracold neutrons (UCN) has been installed at a dedicated beam line at the Institut Laue-Langevin. Incident neutrons with a wavelength of 0.89 nm are converted to UCN in a five liter volume filled with superfluid ${}^4$He at a temperature of about 0.7 K. The UCN can be extracted to room temperature experiments. We present the cryogenic setup of the source, a characterization of the cold neutron beam, and UCN production measurements, where a UCN density in the production volume of at least 55 per cm${}^3$ was determined.

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• Neutron lifetime measurements and effective spectral cleaning with an ultracold neutron trap using a vertical Halbach octupole permanent magnet array
• Optimizing neutron moderators for a spallation-driven ultracold-neutron source at TRIUMF
• Experimental study of ultracold neutron production in pressurized superfluid helium
• Upgrade of the ultracold neutron source at the pulsed reactor TRIGA Mainz
• UCN sources at external beams of thermal neutrons. An example of PIK reactor
• A next-generation inverse-geometry spallation-driven ultracold neutron source
• An ultracold neutron storage bottle for UCN density measurements
• The quest for an electric dipole moment of the neutron
• Status of the GRANIT facility
• Gravitationally induced quantum transitions
• Neutrons on a surface of liquid helium
• Internal Consistency of Neutron Coherent Scattering Length Measurements from Neutron Interferometry and from Neutron Gravity Reflectometry for Exotic Yukawa Analyses
• Deuterated polyethylene coatings for ultra-cold neutron applications
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• The neutron electric dipole moment experiment at the Spallation Neutron Source
• Design and test of a compact and high-resolution time-of-flight measurement device for cold neutron beams
• Happy Birthday, Ultra-Cold Neutron!
• Towards TUCAN's Search for the Neutron Electric Dipole Moment