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Measurement of the η -> π+π-e+e- branching ratio
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. (Kärnfysik)
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Uppsala University, Uppsala, Sweden.
Vise andre og tillknytning
2007 (engelsk)Inngår i: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 644, nr 5-6, s. 299-303Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The reaction at threshold was used to provide a clean source of η mesons for decay studies with the WASA detector at CELSIUS. The branching ratio of the decay ηπ+πe+e is measured to be (4.3±1.3±0.4)×10−4.

sted, utgiver, år, opplag, sider
Elesevier , 2007. Vol. 644, nr 5-6, s. 299-303
Emneord [en]
Eta meson decays; Dalitz decays
HSV kategori
Forskningsprogram
kärnfysik
Identifikatorer
URN: urn:nbn:se:su:diva-42336DOI: 10.1016/j.physletb.2006.12.008 |ISI: 000243851000003OAI: oai:DiVA.org:su-42336DiVA, id: diva2:345467
Merknad
50 authorsTilgjengelig fra: 2010-08-25 Laget: 2010-08-25 Sist oppdatert: 2017-12-12bibliografisk kontrollert
Inngår i avhandling
1. Mesonic fusion - pion and eta meson production in light ion nuclear fusion reactions
Åpne denne publikasjonen i ny fane eller vindu >>Mesonic fusion - pion and eta meson production in light ion nuclear fusion reactions
2010 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The present thesis describes two experiments performed in the storage ring CELSIUS at The Svedberg Laboratory in Uppsala. In the first experiment the importance of three - nucleon clustering in the six - nucelon system was investigated. The total cross section for the production of the ground state and the 3.56 MeV second excited state of 6Li in the 3He(3He,6Li)π+ reaction has been measured at two beam energies, 261.1 and 262.5 MeV, corresponding to center - of - mass energies 1.2 and 1.9 MeV above the production threshold for the 3.56 MeV state. For the ground state the result was 347 ± 84 ± 42 and 92 ± 84 ± 11 nb respectively. The result for the 3.56 MeV state, 104 ± 23 ± 12 and 56 ± 35 ± 7 nb respectively, is compared to the result of a previous study where the 3.56 MeV state was populated in the d(4He,6Li)π0 reaction.

In the second experiment a clean sample of 5×105 eta mesons was prepared by means of the d(p,3He)η reaction. Eta production was tagged by the precise determination of the kinetic energy of the associated 3He ions. In the subsequent decay of eta mesons, channels with lepton - anti - lepton pairs were studied in the WASA detector. In a separate study properties of the WASA deuterium pellet target were investigated and in particular the effects on the beam of the beam - target interactions.

In both sets of experiments the fused nuclear system was detected by means of a zero - degree spectrometer with a semiconductor detector telescope. Choosing the detectors to match the rather different requirements, precise information regarding the identity and the momentum of the detected ions could be obtained in both cases.

sted, utgiver, år, opplag, sider
Stockholm: Department of Physics, Stockholm University, 2010. s. 99
Emneord
pionic fusion, halo nuclei, cross sections, light mesons, eta-meson, WASA detector
HSV kategori
Forskningsprogram
kärnfysik
Identifikatorer
urn:nbn:se:su:diva-39875 (URN)978-91-7447-103-8 (ISBN)
Disputas
2010-10-01, FD5, AlbaNova universitetscentrum, Roslagstullbacken 21, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2010-09-09 Laget: 2010-06-02 Sist oppdatert: 2010-08-26bibliografisk kontrollert

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