Partridge, Guthrie B.Li, WenhuiKamar, Ramsey I.Liao, Yean-anHulet, Randall G.2015-04-172015-04-172006Partridge, Guthrie B., Li, Wenhui, Kamar, Ramsey I., et al.. "Pairing and Phase Separation in a Polarized Fermi Gas." <i>Science,</i> 311, no. 5760 (2006) American Association for the Advancement of Science: 503-505. http://dx.doi.org/10.1126/science.1122876.https://hdl.handle.net/1911/79456We report the observation of pairing in a gas of atomic fermions with unequal numbers of two components. Beyond a critical polarization, the gas separates into a phase that is consistent with a superfluid paired core surrounded by a shell of normal unpaired fermions. The critical polarization diminishes with decreasing attractive interaction. For near-zero polarization, we measured the parameter β = –0.54 ± 0.05, describing the universal energy of a strongly interacting paired Fermi gas, and found good agreement with recent theory. These results are relevant to predictions of exotic new phases of quark matter and of strongly magnetized superconductors.engThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the American Association for the Advancement of Science.Journal articlehttp://dx.doi.org/10.1126/science.1122876