Possible evidence for narrow bound states related to the p anti p system
- CERN, Geneva
The exceptionally narrow, high mass nonstrange bosons clustered around the nucleon-antinucleon threshold are studied using a method based on the observation of monenergetic gamma rays accompanying the annihilation of stopped antiprotons in liquid hydrogen, where the anti p forms an antiprotonic atom with the target proton. In this way bound states were observed in the anti pp system for the first time. Three narrow structures at energies of 183, 216, and 420 MeV were seen with a confidence of 1, 2.5, and 1.8% respectively. The spectra are shown. Also applying the same methods to the anti p - He the case structure was found with 365 +- 26 MeV energy and 7.2% confidence. This would imply the formation of a bound state inside of nuclear matter. 47 references. (JFP)
- OSTI ID:
- 6536599
- Report Number(s):
- CONF-770674-; TRN: 79-000707
- Journal Information:
- AIP (Am. Inst. Phys.) Conf. Proc.; (United States), Vol. 41; Conference: Nucleon-nucleon interaction meeting, Vancouver, Canada, 27 Jun 1977
- Country of Publication:
- United States
- Language:
- English
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MESON RESONANCES
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PARTICLE WIDTHS
NUCLEAR MATTER
BOUND STATE
PROTON-ANTIPROTON INTERACTIONS
ANNIHILATION
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MASS SPECTRA
NUCLEON-ANTINUCLEON INTERACTIONS
PARTICLE PRODUCTION
THRESHOLD ENERGY
ATOMS
BARYON-BARYON INTERACTIONS
BASIC INTERACTIONS
BOSONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MATTER
MESONS
PARTICLE INTERACTIONS
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RESONANCE PARTICLES
SPECTRA
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