They made 50 neutrons from this shot! You can make billions per second, steady state, with a tabletop device plugged into a standard outlet.

Edit: Fusion makes ~ 10^15 neutrons for every watt-hour of energy released (for the easiest kind of fusion)

https://www.wolframalpha.com/input/?i=1+Wh+%2F+17.6+MeV