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If you were to mix antiprotons with ordinary matter, the particles would annihilate in less than a picosecond.
But there is an exception. Mixed with helium gas, about 3% of the antiprotons will combine with helium atoms, forming antiprotinic helium.
Antiprotonic helium consists of a antiproton and an electron orbiting a helium nucleus (two protons and two neutrons). They can exist for up to tens of microseconds, before decaying.
http://en.wikipedia.org/wiki/Antiprotonic_helium
2015-03-26
mkje.se/p552
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