This is not anywhere near a correct description of a sonic boom. A sonic boom is not "a large burst when [an object] “breaks the sound barrier”." It is a phenomenon that is associated with any object traveling at or above the speed of sound. A related phenomenon governs the crack of a whip, but is associated with unsteady flow around a subsonic object. (Yes, you read that right. The business end of a bullwhip does not need to travel faster than the speed of sound to produce an audible crack.)
What really happens in a sonic boom is, for a slender body traveling above the speed of sound, the local flow is turned "suddenly," and the freestream is not able to accommodate it in a continuous fashion. There then arises an oblique shock wave, a very small region where fluid properties change nearly instantaneously; Direction, temperature, pressure, and entropy all change. Because the change is not isentropic, there is a hard lower limit to parasitic drag associated with supersonic motion through a fluid.
Interestingly, there is an expansion fan at the widest part of, for example, an aircraft body that is isentropic. It's a broad region where temperature, pressure, and direction change gradually. Thus, there are three 'sonic booms' when an aircraft passes overhead at a speed greater than the speed of sound. There is one sharp one as the nose passes you, due to a compression shock, and another softer one as the widest part passes you, due to an expansion fan, and a third one as the tail passes you, due to another compression shock. This is analogous to Mach diamonds in a rocket exhaust stream.
This is all for sufficiently lax definitions of "passing you," as the shock and expansion fans propagate at the local Mach angle. You'll be looking downstream at the local Mach angle when you hear the boom, if you're following the craft with your eyes.