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arXiv · 1003.3867

Bose-Einstein Condensation of $^{88}$Sr Through Sympathetic Cooling with $^{87}$Sr

P. G. Mickelson·Y. N. Martinez de Escobar·M. Yan·B. J. DeSalvo·T. C. Killian
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Abstract

We report Bose-Einstein condensation of $^{88}$Sr, which has a small, negative s-wave scattering length ($a_{88}=-2$\,$a_0$). We overcome the poor evaporative cooling characteristics of this isotope by sympathetic cooling with $^{87}$Sr atoms. $^{87}$Sr is effective in this role in spite of the fact that it is a fermion because of the large ground state degeneracy arising from a nuclear spin of $I=9/2$, which reduces the impact of Pauli blocking of collisions. We observe a limited number of atoms in the condensate ($N_{max}\approx 10^4$) that is consistent with the value of $a_{88}$ and the optical dipole trap parameters.

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P. G. Mickelson, Y. N. Martinez de Escobar, M. Yan, B. J. DeSalvo, T. C. Killian. 2010-03-19. Bose-Einstein Condensation of $^{88}$Sr Through Sympathetic Cooling with $^{87}$Sr. https://doi.org/10.1103/physreva.81.051601

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