| 1. |
- Adiels, L., et al.
(author)
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Pi0 and eta spectra from proton-antiproton annihilations at rest
- 1984
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In: Zeitschrift für Physik. C, Particles and fields. - 0170-9739. ; 21:4, s. 315-319
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Journal article (peer-reviewed)abstract
- The low-energy part of the Ï€0 spectrum associated with Mathematical expression annihilation at rest was measured in order to search for bound baryonium-like states. The upper limit for reaching such states via the emission of monochromatic Ï€0’s was found to be 8% per annihilation in the mass region of 1650 MeV. The low-energy part of the η spectrum from Mathematical expression annihilations at rest was also observed.
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| 2. |
- Adiels, L., et al.
(author)
-
Search for narrow exotic states in annihilations on 4He
- 1984
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In: Physics Letters B. - : Elsevier BV. - 0370-2693 .- 1873-2445. ; 138:1-3, s. 235-240
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Journal article (peer-reviewed)abstract
- After having found evidence for narrow exotic states in p annihilation, the production of such states on a nuclear target was studied with similar techniques. The γ spectrum associated with annihilation on 4He at rest was measured. The spectrum shows two peaks, at energies of 161.9 and 203.0 MeV, corresponding to intermediate narrow states of masses which seem to be related to states found in p annihilations. The confidence is better than 4 σ.
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| 3. |
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| 4. |
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| 5. |
- Blüm, P., et al.
(author)
-
A modular NaI(Tl) detector for 20-1000 MeV photons
- 1983
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In: Nuclear Instruments and Methods in Physics Research. - : Elsevier BV. - 0167-5087. ; 213:2-3, s. 251-259
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Journal article (peer-reviewed)abstract
- A detector consisting of 54 NaI (Tl) modules is described. The detector has been optimized for the detection of 20-1000 MeV photons. An energy resolution (fwhm) of 5.5% at 130 MeV could be attained, and the stability has been better than 1% over several months.
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| 6. |
- Guigas, R., et al.
(author)
-
Strong interaction effects in antiprotonic 6Li/7Li atoms
- 1984
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In: Physics Letters B. - : Elsevier BV. - 0370-2693 .- 1873-2445. ; 137:56, s. 323-328
-
Journal article (peer-reviewed)abstract
- The effects of strong interaction on the 3 –> 2 X-ray transition in antiprotonic 6Li/7Li atoms have been measured at the low energy -beam at CERN. For the shifts and widths of the levels the values [epsilon]2p = (-230 ï¿œ 72) eV, [Gamma]2p = (443 ï¿œ 210) eV, and [Gamma]3d = (0.130 ï¿œ 0.045) eV for 6Li, and [epsilon]2p = (-336 ï¿œ 60) eV, [Gamma]2p = (456 ï¿œ 190) eV, and [Gamma]3d = (0.210 ï¿œ 0.062) eV for 7Li were found. The data are compared with optical model predictions.
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| 7. |
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| 8. |
- Richter, B., et al.
(author)
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New results in the search for narrow states in the p system below threshold
- 1983
-
In: Physics Letters B. - : Elsevier BV. - 0370-2693 .- 1873-2445. ; 126:3-4, s. 284-288
-
Journal article (peer-reviewed)abstract
- The γ-ray spectrum after p annihilation at rest was measured in two independent high-statistics runs. Both spectra show narrow peaks, corresponding to masses of 1210, 1638, 1694 and 1771 MeV.
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| 9. |
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