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Decay kinetics and Bose condensation in a gas of spin-polarized triplet helium.

We consider the decay kinetics of a trapped spin-polarized gas of metastable triplet helium 4He(2'S) at ultralow temperatures. The sample lifetime is found to be determined by spin relaxation and Penning ionization, both induced by spin-dipole interaction in pair collisions. The rates of these processes are calculated. The Penning ionization proves to be 5 orders of magnitude slower than in the unpolarized case. The results indicate that spin-polarized triplet helium is a promising candidate for Bose-Einstein condensation.