[en] The expected value of nuclear spin polarization to inertial confinement fusion is recapitulated. A comparison of brute force versus dynamic nuclear polarization, as applied to solid deuterium-tritium, is given, and the need for a long triton polarization memory time (longitudinal nuclear relaxation time) is shown. The time constant for 25 mol%T₂-50 DT-25 D₂ is a short 0.3 s at 5/degree/K and waiting lowers it to 0.1 s. Use of 90 to 96 mol% molecular DT raises the time constant to 0.9 s and addition of about 20 mol% nH₂ increases it to 5 to 7 s. The theory shows that the species shortening the triton memory time is the J = 1 T₂, which can be reduced in our samples only by self-catalysis. The heating in order to mix in nH₂ increases the percent of J = 1 T₂ and mixing may not be perfect. The experiments have increased the triton memory time twenty-fold and shown that removal of the J = 1 T₂ is the key to improved results