If by neutron bomb you mean "fusion bomb", then most nuclear weapons can apply. They use the (uncontrolled..) fusion of H atoms to produce He.
Joe is right, that's what the stars are made of.
The reaction requires high amounts of H, which is present (scarcely, but enough) in the atmosphere and helps fueling the blast.
In space where there is, well, nothing, i doubt the blast would be so powerful. But if the bomb carries its own supply of hydorgen, you *would* have a fiery expanding "ball".
Foot note: our own stupid president (J, Chirac, nearly as stupid as Bush Jr) set up a campaign in 1995-1996 to try out our latest nuke arsenal in Mururoa archipel. The bombs were H bombs indeed, and the underwater blasts were quite powerful...
foot note #2: the first bombs (those released on Hiroshima and tested in the USA on real human beings...) were fission bombs, based on breaking plutonium atoms. H bombs are still based on this reaction to 'kickstart' the fusion reaction.
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