Figure 3. The decay under different conditions.

(a,b) Survival probability P versus time t for the B and A collisions, respectively. The black squares are experimental data collected at the trap depth U₀=0.6 mK, with each point being the result from 300 repeated measurements. The solid curves show a fit by the formula P=w exp(−t/τ)+w₀, and the error in the decay time indicates the s.d. when using the fit of P(t) by the exponential formula. In (a) The measurements are done for the survival probability of ⁸⁵Rb after kicking out ⁸⁷Rb, and the initial temperatures are T₈₇=35±3 μK and T₈₅=15±1 μK. In (b) ⁸⁵Rb is kicked out, and the survival probability of ⁸⁷Rb is measured with the initial temperatures T₈₇=47±3 μK and T₈₅=27±2 μK.