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 Ï0 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 Ï0’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)
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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. |
- Blüm, P., et al.
(author)
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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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5. |
- Richter, B., et al.
(author)
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New results in the search for narrow states in the p system below threshold
- 1983
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In: Physics Letters B. - : Elsevier BV. - 0370-2693 .- 1873-2445. ; 126:3-4, s. 284-288
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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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6. |
- Zioutas, K., et al.
(author)
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Baryonium physics
- 1983
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In: Proceedings of the 1st Hellenic School on Elementary Particle Physics. - : Institution of Electrical Engineers (IEE). ; , s. 437-466
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Conference paper (peer-reviewed)abstract
- Various theoretical ideas on nuclear physics, quark models, and the dual topological unitarization lead to the expectation of massive mesons, called baryonium, coupled strongly to the ppmacr channel but weakly to mesons, thus resulting in a virtually high stability, particularly below the ppmacr threshold. Such states are relevant to nuclear physics owing to the fact that the badly explored short-range forces in the NN interactions are just the most relevant ones in the NNmacr systems. From the known NN potential, one is led to expect short-range attraction in NNmacr systems, and this should result in quasinuclear bound states in the vicinity of threshold.
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7. |
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8. |
- Guigas, R., et al.
(author)
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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
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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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9. |
- Kjellén, G., et al.
(author)
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Scintigraphy, radiography, and acid clearing in dysphagia patients after anti-reflux surgery
- 1984
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In: Scandinavian Journal of Gastroenterology. - 0036-5521 .- 1502-7708. ; 19:8, s. 1022-1026
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Journal article (peer-reviewed)abstract
- Oesophageal emptying was studied with scintigraphy, radiography, and the acid clearing test (ACT) in 18 patients reporting dysphagia and previously operated on with fundoplication. Radiography with contrast medium, isodense with water, revealed abnormalities in either motility or emptying capacity in 39% (7/18). A A barium meal showed abnormalities--that is, a tight repair, disruption of the fundoplication, or recurrence of the hernia--in 56% (10/18). The ACT was prolonged in 40% (6/15) of the patients. Pathological findings at scintigraphy with a solid bolus were found in 67% (12/18). Even if scintigraphy with a solid bolus is the method that identifies the highest number of patients with impaired oesophageal function among the tests used, it cannot differentiate between functional and anatomical disorders. A barium meal examination is the method of choice when an anatomical disorder is suspected.
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10. |
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