Breakup and Recombination of Identical Bosons: He Dimer-Monomer Collisions

摘要

Abstract. Three He atoms can react in vapor at temperatures of the order of a fewdegrees Kelvin to form a dimer and a free atom by three-body collisions. Conversely, the dimer may fragment by collisions with free He atoms. Cross sections and reaction rates for these processes have been computed at milliKelvin temperatures using the hyperspherical hidden crossing theory. At higher energies, of the order of 0.1 to 5 Kelvin, the impulse approximation has been used to estimate these processes. The computed fragmentation cross section is reported.