Clusters of Matter and Antimatter

Journal Article · Fri Jan 12 04:00:00 EST 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2435290· OSTI ID:20900803

Greiner, Walter ^[1]

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1. Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe University, Max-von-Laue-Str. 1, 60438 Frankfurt (Germany)

irst present the vacuum for the e+-e- field of QED and show how it is modified for baryons in the nuclear environment. We then study the possibility of producing a new kind of nuclear systems which in addition to ordinary nuclei contain a few antibaryons (B-bar = p-bar, {lambda}-bar, etc). The properties of such systems are described within the relativistic mean-field model by employing G-parity transformed interactions for antibaryons. Calculations are done for finite nuclei from 4He to 208Pb. It is demonstrated that the presence of a real antibaryon leads to a strong rearrangement of a target nucleus resulting in a significant increase of its binding energy and local compression. Noticeable effects remain even after the antibaryon coupling constants are reduced by a factor of 3-4 compared to G-parity motivated values. We have performed detailed calculations of the antibaryon annihilation rates in the nuclear environment by applying the kinetic approach. It is shown hat due to a significant reduction of the reaction Q-values, the in-medium annihilation rates should be strongly suppressed leading to relatively long-lived antibaryon-nucleus systems. Multi-nucleon annihilation channels are analyzed too. We have also estimated formation probabilities of antiproton+A bound systems in antiproton-A reactions and have found that their observation is feasible at the future GSI antibaryon facility. Several observable signatures are proposed. The possibility of producing multi-quark-antiquark clusters is discussed.

• OSTI ID: 20900803
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 881; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
ANTI-B NEUTRAL MESONS
ANTILAMBDA PARTICLES
ANTIPROTONS
BINDING ENERGY
CLUSTER MODEL
COUPLING CONSTANTS
G PARITY
HELIUM 4
LEAD 208
MEAN-FIELD THEORY
PARITY
PROBABILITY
QUANTUM ELECTRODYNAMICS
QUARKS
RELATIVISTIC RANGE