Estimated performance of the TRIUMF ultracold neutron source and electric dipole moment apparatus

Abstract

Searches for the permanent electric dipole moment of the neutron (nEDM) provide strong constraints on theories beyond the Standard Model of particle physics. The TUCAN collaboration is constructing a source for ultracold neutrons (UCN) and an apparatus to search for the nEDM at TRIUMF, Vancouver, Canada. In this work, we estimate that the spallation-driven UCN source based on a superfluid helium converter will provide $(1.38\pm 0.02)\times 10^7$ polarized UCN at a density of $217\pm 3$~UCN/cm${}^3$ to a room-temperature EDM experiment per fill. With $(1.51\pm 0.02)\times 10^6$ neutrons detected after the Ramsey cycle, the statistical sensitivity for an nEDM search per storage cycle will be $(1.94\pm 0.06)\times 10^{-25}e$cm (1$\sigma$). The goal sensitivity of $10^{-27}e$cm (1$\sigma$) can be reached within $280\pm 16$ measurement days.

arXiv commentProceedings submitted to EPJ Web of Conferences for the Symposium on Symmetries in Subatomic Physics (SSP2022)

References in corpus (11)

• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
• Measurement of the permanent electric dipole moment of the neutron
• Performance of the upgraded ultracold neutron source at Los Alamos National Laboratory and its implication for a possible neutron electric dipole moment experiment
• The design of the n2EDM experiment
• First ultracold neutrons produced at TRIUMF
• Ultracold neutron production and up-scattering in superfluid helium between 1.1 K and 2.4 K
• Optimizing neutron moderators for a spallation-driven ultracold-neutron source at TRIUMF
• A beamline for fundamental neutron physics at TRIUMF
• PENTrack---a simulation tool for ultracold neutrons, protons, and electrons in complex electromagnetic fields and geometries
• Measurement of spin-flip probabilities for ultracold neutrons interacting with nickel phosphorus coated surfaces
• Characterization of a scintillating lithium glass ultra-cold neutron detector

Cited by in corpus (1)

• A diffuse scattering model of ultracold neutrons on wavy surfaces