Interaction of low-energy antiprotons with nuclei

Journal Article · Sun Nov 01 04:00:00 EST 1987 · Sov. J. Particles Nucl. (Engl. Transl.); (United States)

OSTI ID:7186108

Dal'karov, O D; Karmanov, V A

The first results on the interaction of antiprotons with nuclei obtained in experiments at the Low Energy Antiproton Ring (LEAR) put into operation at CERN at the end of 1983 are presented and analyzed. In contrast to the case with protons of the same energy (approx.50 MeV), elastic p-bar--nucleus scattering manifests a pronounced diffractive nature and is described well by the Glauber--Sitenko approximation taking into account the Coulomb interaction. The effective nuclear radius determined from antiproton scattering is significantly (1.5 times for /sup 12/C) larger than the radius determined from proton and electron scattering. We discuss the possible reasons for the applicability of the Glauber--Sitenko approach for antiprotons at such low energies. We show that it is possible to determine the parameters of the p-barN amplitude (in particular, the ratio of its real and imaginary parts) from the nuclear data. Data on the yield of /sup 3/He nuclei in p-bar/sup 4/He annihilation are presented. The p-bar--nucleus optical potential is analyzed. We discuss the phenomenon of the cancellation between off-shell and nonadiabatic effects in the amplitude of the reaction p-bard..-->..e/sup +/e/sup -/n, which leads to specific experimental consequences. The p-bar--nucleus scattering lengths and level shifts of antiprotonic atoms are discussed.

• Research Organization: P. N. Lebedev Physics Institute, USSR Academy of Sciences, Moscow
• OSTI ID: 7186108
• Journal Information: Sov. J. Particles Nucl. (Engl. Transl.); (United States), Journal Name: Sov. J. Particles Nucl. (Engl. Transl.); (United States) Vol. 18:6; ISSN SJPNA
• Country of Publication: United States
• Language: English

Related Subjects

653003* -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANTINUCLEON REACTIONS
ANTIPROTON REACTIONS
BARYON REACTIONS
CARBON 12 TARGET
DATA
ELASTIC SCATTERING
ENERGY RANGE
EXPERIMENTAL DATA
GLAUBER THEORY
HADRON REACTIONS
HELIUM 3 TARGET
INFORMATION
MEV RANGE
MEV RANGE 10-100
NUCLEAR POTENTIAL
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUMERICAL DATA
OPTICAL MODELS
POTENTIALS
SCATTERING
TARGETS
THEORETICAL DATA