HEAT-CAPACITY OF LOW-TEMPERATURE SOLID HE-3

We have calculated the spin wave spectra and from these the specific h eats of CNAF and UUDD solid He-3 at low temperatures. We compare with experiment and find good agreement even though we also find major devi ations from simple T3 behavior. The calculation included the six-spin exchange terms now recognized to be important for quantitative calcula tions. The inclusion of these terms was made more tractable by applica tion of an algebraic technique from nuclear theory (Random Phase Appro ximation) for execution of the spin wave calculation, which neverthele ss involved lengthy analysis.