Would a moon shatter if it collided with an unmovable barrier?
For story purposes, I'm trying to determine what would happen if a small moon-sized object crashed into an unmovable barrier surrounding a planet. My goal here is to eventually get a ring surrounding the planet, but I don't know if that would happen, or if fragments of the moon would achieve escape velocity, or the moon wouldn't shatter at all. So that's my question: Would a moon shatter if it collided with an unmovable barrier surrounding a planet? Details are below.
The moon isn't technically a moon, as it is not orbiting a planet. I'm not even sure if it's orbiting a sun, or is a 'rogue dwarf planet'. Disregard its origins for now. I will call it a 'moon' for simplicity's sake.
Consider the moon to be Mimas, divided by 95. So it has a mass of approximately $3.95 \cdot 10^{17}$ kg (Assuming I did the math right). The moon is primarily icy, just like Mimas. I don't have the faintest idea how fast the moon needs to be moving to shatter when it hits the barrier, so I will leave that up to you. I want it to shatter, not just bounce off. Remember I'm trying to get a ring. For all purposes, assume the moon is the exact composition of Mimas, just 95 times smaller.
The barrier would be some sort of energy barrier, though it's exact composition is unknown at this time. It is surrounding the entire planet and is unmovable. For all purposes, just assume that the moon has run into a material barrier which is unmovable, and indestructible. The moon hits this barrier head-on, at a perfect ninety-degree angle. The barrier will not give at all, so all force is transferred back to the moon.
Given these details, and assuming the speed of the moon is sufficient to shatter it, as opposed to just ricocheting back into space, what would happen to the moon? Please let me know if you need additional details.
Disregard for now the chances of such an event actually occurring.
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