0.000 000 000 000 000 000 000 000 001 672 kg
= 0.111 x 300,000,000 x 300,000,000
= 10,000,000,000,000,000 Joules
1.672x10
-27= 1.11x10
-1 x 3x10
8 x 3x10
8 = 1x10
16 Joules
Science loves standard form numbers.
And if you want antimatter, you'll have to be colliding atoms together at really high speeds, in some conditions antimatter forms and has to be kept under vacumn and magnetic feilds to keep it away from standard matter.
If you have a good dig in New Mexico you might find the spot where the first atomic bomb had been tested, a large area of sand had been turned instantly to glass upon the blast. Might be interesting to look at.