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.

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

References in corpus (4)

• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
• Measurement of the permanent electric dipole moment of the neutron
• Optimizing neutron moderators for a spallation-driven ultracold-neutron source at TRIUMF
• Characterization of a scintillating lithium glass ultra-cold neutron detector