First measurement of the hydrogen spin-exchange collision cross-section in the low temperature regionC. Baumgarten, B. Braun, M. Capiluppi, G. Ciullo, P. F. Dalpiaz, H. Kolster, P. Lenisa, H. Marukyan, A. Nass, D. Reggiani, M. Stancari and E. SteffensEur. Phys. J. D, 48 3 (2008) 343-350DOI: https://doi.org/10.1140/epjd/e2008-00124-1