@article{mumm_huber_bauder_abrams_deibel_huffer_huffman_schelhammer_janssens_jiang_et al._2016, title={High-sensitivity measurement of He-3-He-4 isotopic ratios for ultracold neutron experiments}, volume={93}, number={6}, journal={Physical Review C}, author={Mumm, H. P. and Huber, M. G. and Bauder, W. and Abrams, N. and Deibel, C. M. and Huffer, C. R. and Huffman, P. R. and Schelhammer, K. W. and Janssens, R. and Jiang, C. L. and et al.}, year={2016} }
 @article{huffman_coakley_doyle_huffer_mumm_o'shaughnessy_schelhammer_seo_yang_2014, title={Design and performance of a cryogenic apparatus for magnetically trapping ultracold neutrons}, volume={64}, ISSN={["1879-2235"]}, DOI={10.1016/j.cryogenics.2014.09.008}, abstractNote={The cryogenic design and performance of an apparatus used to magnetically confine ultracold neutrons (UCN) is presented. The apparatus is part of an effort to measure the beta-decay lifetime of the free neutron and is comprised of a high-current superconducting magnetic trap that surrounds ∼21 l of isotopically pure 4He cooled to approximately 250 mK. A 0.89 nm neutron beam can enter the apparatus from one end of the magnetic trap and a light collection system allows visible light generated within the helium by decays to be transported to detectors at room temperature. Two cryocoolers are incorporated to reduce liquid helium consumption.}, journal={CRYOGENICS}, author={Huffman, P. R. and Coakley, K. J. and Doyle, J. M. and Huffer, C. R. and Mumm, H. P. and O'Shaughnessy, C. M. and Schelhammer, K. W. and Seo, P-N. and Yang, L.}, year={2014}, pages={40–50} }