Pair-breaking in superfluid 3He.

Studies of the way in which negative ions move through liquid 3He have resulted in a particularly revealing demonstration of the superfluid properties which it exhibits in the temperature range around I mK. The experiments, carried out at Helsinki Technical University by A. I. Ahonen, J. Kokko, O. V. Lounasmaa, M. A. Paalanan, R. C. Richardson, W. Schoepe and Y. Takano, and reported in Physical Review Letters (37, 511; 1976), represent the first successful investigation of ion motion in the recently discovered superfluid phases of the liquid