Antiproton-hydrogen atom rearrangement-annihilation cross section

Conference · Fri Aug 22 04:00:00 EDT 1986

OSTI ID:5264554

Morgan, Jr, D L

For antiproton energies of several eV or less, annihilation in matter occurs through atomic rearrangement processes in which the antiproton becomes bound to a nucleus prior to annihilation. Existing calculations of the antiproton-hydrogen atom rearrangement cross section are semiclassical and employ the Born-Oppenheimer approximation. They also employ various arguments in regard to the behavior of the system when the Born-Oppenheimer approximation breaks down at small antiproton-proton separations. These arguments indicate that rearrangement is essentially irreversible. In the present study, a detailed investigation was made of the antiproton-hydrogen atom system when the Born-Oppenheimer approximation breaks down. The results of this study indicate that the previous arguments were approximately correct, but that there is a significant probability for rearrangement reversing prior to annihilation. This probability is estimated to be about 20%. 8 refs., 4 figs., 2 tabs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5264554
• Report Number(s): UCRL-94652; CONF-860833-2; ON: DE86016080
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ANNIHILATION
ANTINUCLEON REACTIONS
ANTIPROTON REACTIONS
BARYON REACTIONS
BASIC INTERACTIONS
CROSS SECTIONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTS
ENERGY RANGE
EV RANGE
EV RANGE 01-10
HADRON REACTIONS
HYDROGEN
INTERACTIONS
MATHEMATICAL MODELS
NONMETALS
NUCLEAR REACTIONS
NUCLEON REACTIONS