Antibaryons bound in nuclei

Journal Article · Tue Mar 01 04:00:00 EST 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.71.035201· OSTI ID:20696019

Mishustin, I N; Satarov, L M ^[1]; Buervenich, T J ^[2]; Stoecker, H ^[1]; Greiner, W ^[1]

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1. Frankfurt Insitute for Advanced Studies, J.W. Goethe Universitaet, D-60054 Frankfurt (Germany)
2. Institut fuer Theoretische Physik, J.W. Goethe Universitaet, D-60054 Frankfurt (Germany)

We study the possibility of producing a new kind of nuclear system that in addition to ordinary nucleons contains a few antibaryons (B{sup -}=p{sup -},{lambda}{sup -}, etc.). The properties of such systems are described within the relativistic mean-field model by employing G-parity transformed interactions for antibaryons. Calculations are first done for infinite systems and then for finite nuclei from {sup 4}He to {sup 208}Pb. 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 a kinetic approach. It is shown that owing to significant reduction of the reaction Q values, the in-medium annihilation rates should be strongly suppressed, leading to relatively long-lived antibaryon-nucleus systems. Multinucleon annihilation channels are analyzed too. We have also estimated formation probabilities of bound B{sup -}+A systems in p{sup -}A reactions and have found that their observation will be feasible at the future GSI antiproton facility. Several observable signatures are proposed. The possibility of producing cold multi-quark-antiquark clusters is discussed.

• OSTI ID: 20696019
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 71; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANNIHILATION
ANTIPROTONS
BINDING ENERGY
COUPLING CONSTANTS
G PARITY
HELIUM 4
HYPERNUCLEI
LAMBDA BARYONS
LEAD 208
MEAN-FIELD THEORY
NUCLEAR FORCES
NUCLEAR MATTER
PROBABILITY
PROTON-NUCLEON INTERACTIONS
QUANTUM FIELD THEORY
QUARKS
RELATIVISTIC RANGE