Assertion: metal's use | /r/Causes | transition
Facets:
value: to the denser α form
type: OTHER
value: from the usual δ phase plutonium
type: OTHER
Source sentences:
text: In fission weapons, the explosive shock waves used to compress a plutonium core will also cause a transition from the usual δ phase plutonium to the denser α form, significantly helping to achieve supercriticality.