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Search for rare neutral two-body channels in the pp annihilation at rest: performed by measurments of high energy γ-rays using a modular NaI(Tl)-spectrometer
Stockholm University, Faculty of Science, The Manne Siegbahn Laboratory .
1986 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: Tekniska högskolan , 1986. , 68 p.
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-46099ISBN: 91-7170-986-X (print)OAI: oai:DiVA.org:su-46099DiVA: diva2:371472
Public defence
1986-03-07, Kollegiesalen, Vallhallavägen 79, Stockholm, 10:00 (English)
Opponent
Supervisors
Available from: 2010-11-22 Created: 2010-11-20 Last updated: 2010-11-24Bibliographically approved
List of papers
1. A modular NaI(Tl) detector for 20-1000 MeV photons
Open this publication in new window or tab >>A modular NaI(Tl) detector for 20-1000 MeV photons
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1983 (English)In: Nuclear Instruments and Methods in Physics Research, ISSN 0167-5087, Vol. 213, no 2-3, 251-259 p.Article in journal (Refereed) Published
Abstract [en]

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.

National Category
Physical Sciences
Identifiers
urn:nbn:se:su:diva-46053 (URN)10.1016/0167-5087(83)90417-9 (DOI)
Available from: 2010-11-20 Created: 2010-11-20 Last updated: 2010-11-22Bibliographically approved
2. Proton-antiproton annihilations at rest into π0ω, π0η, π0γ, π0π0, and π0η’
Open this publication in new window or tab >>Proton-antiproton annihilations at rest into π0ω, π0η, π0γ, π0π0, and π0η’
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1983 (English)In: Nuclear Physics B, ISSN 0550-3213, E-ISSN 1873-1562, Vol. 228, no 3, 424-438 p.Article in journal (Refereed) Published
National Category
Physical Sciences
Identifiers
urn:nbn:se:su:diva-46055 (URN)10.1016/0550-3213(83)90553-9 (DOI)
Available from: 2010-11-20 Created: 2010-11-20 Last updated: 2017-12-12Bibliographically approved
3. New results in the search for narrow states in the p system below threshold
Open this publication in new window or tab >>New results in the search for narrow states in the p system below threshold
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1983 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 126, no 3-4, 284-288 p.Article in journal (Refereed) Published
Abstract [en]

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.

National Category
Physical Sciences
Identifiers
urn:nbn:se:su:diva-46134 (URN)10.1016/0370-2693(83)90608-1 (DOI)
Available from: 2010-11-21 Created: 2010-11-21 Last updated: 2017-12-12Bibliographically approved
4. Search for narrow exotic states in annihilations on 4He
Open this publication in new window or tab >>Search for narrow exotic states in annihilations on 4He
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1984 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 138, no 1-3, 235-240 p.Article in journal (Refereed) Published
Abstract [en]

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.

National Category
Physical Sciences
Identifiers
urn:nbn:se:su:diva-46058 (URN)10.1016/0370-2693(84)91907-5 (DOI)
Available from: 2010-11-20 Created: 2010-11-20 Last updated: 2017-12-12Bibliographically approved
5. Pi0 and eta spectra from proton-antiproton annihilations at rest
Open this publication in new window or tab >>Pi0 and eta spectra from proton-antiproton annihilations at rest
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1984 (English)In: Zeitschrift für Physik. C, Particles and fields, ISSN 0170-9739, Vol. 21, no 4, 315-319 p.Article in journal (Refereed) Published
Abstract [en]

The low-energy part of the π0 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 π0’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.

National Category
Physical Sciences
Identifiers
urn:nbn:se:su:diva-46064 (URN)10.1007/BF01581594 (DOI)
Available from: 2010-11-20 Created: 2010-11-20 Last updated: 2010-11-22Bibliographically approved

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