Nuclearfusion Rates Are Extremely Sensitive to Temperature. In Order to Understand Whythis Is So, We Need to Examine How a Fusion Process Operates: Since Thepositively Charged Nuclei Which Need to Fuse Have to Face a Strong Coulombbarrier (See Fig. 1), the Fusion Process Operates Mainly By Tunnelling. In Thecentre of Mass Frame, If the Kinetic Energy of the Approaching Particles Is E,Then the Tunnelling Probability.