Longitudinal Relaxation of $^3$He Vapor in Mixtures of $^3$He and $^4$He Below the $^4$He Lambda Point
Year: 2006
Type: preprint
Abstract: We report a first measurement of the longitudinal relaxation time of $^3$He vapor in a mixture of $^3$He - $^4$He at a temperature below the $^4$He $\\lambda$ point in a deuterated tetraphenyl butadiene (dTPB) coated acrylic cell. %The $^3$He nuclei were polarized through spin-exchange optical pumping %of Rubidium and were then transferred to the acrylic cell which was %embedded in a cryogenic dewar of liquid $^4$He. The $^3$He longitudinal relaxation time, $T_1$, was measured using the Adiabatic Fast Passage technique of Nuclear Magnetic Resonance. We have obtained a $^3$He relaxation time in excess of 3000 seconds at a temperature around 1.9 K. %In comparison the $T_1$ relaxation time from a uncoated acrylic cell %under the same experimental condition is less than 350 seconds. These results are important for a new search on the neutron electric dipole moment, which aims at two orders of magnitude improvement over the current limit. Such sensitivity is important to search for new physics beyond the Standard Model.
Source: arXiv (Cornell University)
Authors: Q. Ye, D. Dutta, Hong Gao, K. Kramer, Xianghong Qian, X. Zong, L. Hannelius, R. D. McKeown, B. Heyburn, S. M. Singer, Robert Golub, E. Korobkina
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2732354576