Preparation of a quantum degenerate mixture of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mi>Na</mml:mi><mml:mprescripts /><mml:none /><mml:mn>23</mml:mn></mml:mmultiscripts><mml:mmultiscripts><mml:mi mathvariant="normal">K</mml:mi><mml:mprescripts /><mml:none /><mml:mn>40</mml:mn></mml:mmultiscripts></mml:mrow></mml:math> molecules and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">K</mml:…

We report on the preparation of a quantum degenerate mixture $^{23}\mathrm{Na}\phantom{\rule{0.16em}{0ex}}^{40}\mathrm{K}$ molecules and $^{40}\mathrm{K}$ atoms. A deeply atomic $^{23}\mathrm{Na}$ atoms with large number ratio (${N}_{F}/{N}_{B}\ensuremath{\approx}6$) is prepared in large-volume optical dipole trap. About $3.0\ifmmode\times\else\texttimes\fi{}{10}^{4}\phantom{\rule{0.16em}{0ex}}^{23}\mathrm{Na}\phantom{\rule{0.16em}{0ex}}^{40}\mathrm{K}$ ground-state are created through magnetoassociation followed by stimulated Raman adiabatic passage. The pure molecular gas moderately regime. In atom-molecule mixture, elastic collisions provide thermalization mechanism for molecules. calculated time constant smaller than lifetime mixture. This indicates that may reach thermal equilibrium due to before notable losses take place. few tens milliseconds, degeneracy maintained. interval long enough study strongly interacting mixtures production ultracold triatomic gases.