Unfortunately, the "neutronium" in ST doesn't behave like the real thing. In "What You Leave Behind," the Cardassian Central Command HQ was said to have a neutronium door -- something which would sink to the center of the planet if it were made of actual neutronium.
Not to mention that if the planet-killer were made of actual neutronium, it would be impossible to maintain that conical shape; it would collapse under its own gravity into a sphere. If the neutronium didn't just expand to a non-degenerate state, since I'm not sure a mass that small could stably exist anyway.
In my TNG novel The Buried Age I tossed in a reference to "neutronium" being a shorthand for "hyponeutronium" (a term I cribbed from Diane Duane's novels), which I defined as a dense, highly durable alloy of stable transuranic elements with nuclei whose mass consisted primarily of neutrons.
Not to mention that if the planet-killer were made of actual neutronium, it would be impossible to maintain that conical shape; it would collapse under its own gravity into a sphere. If the neutronium didn't just expand to a non-degenerate state, since I'm not sure a mass that small could stably exist anyway.
In my TNG novel The Buried Age I tossed in a reference to "neutronium" being a shorthand for "hyponeutronium" (a term I cribbed from Diane Duane's novels), which I defined as a dense, highly durable alloy of stable transuranic elements with nuclei whose mass consisted primarily of neutrons.