Abstract
Several mechanisms for the relaxation of nuclear magnons in flopped cubic antiferromagnets are investigated theoretically. The mechanism that best explains the experimental relaxation rate in RbMn${\mathrm{F}}_{3}$ is a three-magnon process arising from the dipolar Hamiltonian with no momentum conservation due to the role of crystalline inhomogeneities. This is also the most effective process for the relaxation of electronic magnons in RbMn${\mathrm{F}}_{3}$, as previously shown by Woolsey and White.
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