Bose-Einstein condensate in gases of rare atomic species
  We report on the successful extension of production of Bose-Einstein Condensate (BEC) to rare species. Despite its low natural abundance of 0.13%, $^{168}$Yb is directly evaporatively cooled down to BEC. Our successful demonstration encourages attempts to obtain quantum gases of radioactive atoms, which extends the possibility of quantum many-body physics and precision measurement. Moreover, a stable binary mixture of $^{168}$Yb BEC and $^{174}$Yb BEC is successfully formed. 
Seiji Sugawa, Rekishu Yamazaki, Shintaro Taie, Yoshiro Takahashi
physics.atom-ph cond-mat.quant-gas