Improving of ultracold neutron traps coated with liquid helium using capillarity and electric field
arXiv:2303.04429 · doi:10.1103/PhysRevC.108.025501
Abstract
To increase the storage time of ultracold neutrons (UCN) inside the material traps it is promising to cover the trap walls by liquid 4He, the material which does not absorb neutrons at all. A rough side wall of UCN trap holds the required amount of 4He by the capillary effects, but the edges of wall roughness remain insufficiently coated. Here we propose to apply an electric voltage to these rough side walls of UCN traps to increases the thickness of liquid He on the wall edges and to cover the entire wall surface by sufficiently thick helium films. This completely protects UCN from being absorbed inside the trap walls. We estimate the required electric field and voltage for several possible designs of UCN traps. This improvement may give rise to a new generation of ultracold neutron traps with very long storage time. We also estimate the influence of this electric field on the dispersion of ripplons - the quanta surface waves, which give the main contribution to the inelastic UCN scattering at low temperature.
7 pages, 6 figures
References in corpus (11)
- An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
- Measurement of the Weak Axial-Vector Coupling Constant in the Decay of Free Neutrons Using a Pulsed Cold Neutron Beam
- Gravity Resonance Spectroscopy Constrains Dark Energy and Dark Matter Scenarios
- Low Energy Precision Test of Supersymmetry
- Neutron lifetime measurements using gravitationally trapped ultracold neutrons
- Determination of the Axial-Vector Weak Coupling Constant with Ultracold Neutrons
- Exotic decay channels are not the cause of the neutron lifetime anomaly
- Search for explanation of the neutron lifetime anomaly
- Spin flip loss in magnetic confinement of ultracold neutrons for neutron lifetime experiments
- Helium film may greatly increase the storage time of ultracold neutrons in material traps
- On the possibility of a significant increase in the storage time of ultracold neutrons in traps coated with a liquid helium film