Determination of the extraction efficiency for 233U source α-recoil ions from the MLL buffer-gas stopping cellLars v.d. Wense, Benedict Seiferle, Mustapha Laatiaoui and Peter G. ThirolfEur. Phys. J. A, 51 3 (2015) 29DOI: https://doi.org/10.1140/epja/i2015-15029-8