We present our recent results on the scattering length of ${}^4\mathrm{He}-{}^4\mathrm{He}_2$ collisions. These investigations are based on the hard-core version of the Faddeev differential equations. As compared to our previous calculations of the same quantity, a much more refined grid is employed, providing an improvement of about 10%. Our results are compared with other ab initio and model calculations.

• Received 4 August 2004

DOI:https://doi.org/10.1103/PhysRevA.70.052711