In the nuclear fusion reaction $^2_1\text{H} + ^3_1\text{H} \to ^4_2\text{He} + n$, if the repulsive potential energy between the two nuclei is $2.07 \times 10^{-14}\,\text{J}$, then the temperature at which the gases must be heated to initiate the reaction is (Boltzmann constant $= 1.38 \times 10^{-23}\,\text{JK}^{-1}$)