No, it is not possible to stop a supersonic aircraft from breaking the sound barrier if it is designed and operated to do so. When an aircraft exceeds the speed of sound (known as Mach 1), it creates a shock wave called a sonic boom. The sonic boom is a result of the rapid compression of air molecules as the aircraft moves through the air at supersonic speeds.
The sound barrier itself is a term used to describe the dramatic increase in drag and aerodynamic forces experienced by an aircraft as it approaches and surpasses the speed of sound. Once the aircraft reaches and exceeds Mach 1, it will generate a sonic boom regardless of any attempts to prevent it.
However, it is worth noting that there are ongoing efforts to develop aircraft designs and technologies that minimize the intensity and impact of sonic booms, with the goal of reducing their effects on the ground. These efforts focus on shaping the aircraft in a way that reduces the strength of the shockwaves, but they do not eliminate the sonic boom entirely.
In summary, while it is not possible to prevent a supersonic aircraft from breaking the sound barrier and generating a sonic boom, there are research and development efforts aimed at mitigating the effects of sonic booms to make supersonic flight more acceptable near populated areas.