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Yes, protons and neutrons are perhaps the heaviest items on earth. All matter is made up of atoms which are mostly clouds of almost weightless electrons. The nucleus of protons and neutrons has almost all the weight.

You could try for protons instead. Then you could attract and direct them with their positive charge. But you would also have an accumulation of negative charge somewhere. What do you do with that? That's why I thought a neutron gun would be most practical. But so far there seem to be some technical difficulties to resolve.

Looks like the Ruskies are using mere thermal expansion. Nothing fancy.
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