Study of Trapping Sites for Beryllium Atom in C$_{60}$-Fullerene and Electron Capture for $^{7}$Be Nucleus.

First-Principles Hartree-Fock studies of Be atom in C$_{60 }$-fullerene are being carried out for the trapping sites and electron densities at the $^{7}$Be nucleus for these sites, the latter expected to be helpful for understanding the significantly higher electron capture rate for $^{7}$Be as compared to a number of other materials experimentally studied including graphite [1]. Possible trapping sites including those found from Hartree-Fock investigations [2] on muonium (H atom) and additional ones above and below the surface perpendicular to C-C bond centers are being investigated. Results will be presented and discussed. \newline \newline [1] T. Ohtsuki et al, Phys. Rev. Lett. 93, 112501-1 (2004) and references therein. \newline [2] O. Donzelli, T. Briere and T.P. Das, Sol. St. Comm. 90, 663(1994); Indian J. Phys. 67(Spec. Issue), 35(1993).