Nuclear Spin Relaxation of Spin-Polarized Atomic Hydrogen in Bose-Einstein Condensed State

Abstract

A calculation is presented of the relaxation rate T₁⁻¹ between the lower two branches of the atomic hyperfine states in spin-polarized atomic hydrogen H↓ below the Bose-Einstein condensation temperature T₀. We find that T₁⁻¹ has a maximum between T=0 and T₀, which is due to appearance of additional relaxation processes mediated by atoms in the condensed state. Theoretical estimation of T₁ is of the order of a minute with a magnetic field ∼100 kG and with density of H↓∼10¹⁸ atoms/cm³.