*[[Atomic collisions]] [#sfe2cfeb]

The antiproton is a unique probe for atomic physics research. It behaves as a heavy electron or as a negative
nucleus and gives a new test ground for studies of atomic collision dynamics. It is a “theoreticians’ ideal
projectile” because lack of electron capture processes avoids complication in theoretical treatments, and
some theoretical work is going on. Yet so far no experiment was possible at energies less than around
20 keV. With the advent of our ultra-slow antiproton beams at 10–250 eV, ionization and atomic capture
processes of an antiproton projectile against various atoms “A”,

p + A -> pA+ ; A+ + e−

p + A -> (pA+)0 + e−

can be studied for the first time under the single-collision condition. This study also reveals the properties
of exotic antiprotonic atoms formed in vacuo.

**Experimental apparatus [#s3f73c30]

:[[Supersonic Gas Jet chamber]]| was developed for antiprotonic atom formation experiments.


:Detectors | MCP + scintillators + solenoid + DAQ (multihit TDCs and ADCs on CAMAC

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