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  • 1.
    Bargholtz, Chr
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Chernyshev, B.A
    Gerén, L
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Grebenev, V.N
    Gurov, Yu.B
    Karpuhkin, V.S
    Laukhin, I.V
    Martemyanov, B.V
    Matveev, V.A
    Lindberg, Karl
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Shafigullin, R.R
    Sopov, V.S
    Tegnér, Per-Erik
    Zartova, Irina
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Tagging of η mesons using the pd3Heη reaction near threshold2006Inngår i: Instruments and experimental techniques (New York), ISSN 0020-4412, E-ISSN 1608-3180, Vol. 49, nr 4, s. 461-467Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A zero-degree spectrometer for tagging η mesons on the CELSIUS/WASA facility is described, and its characteristics are presented. Tagging of η mesons is performed by detecting 3He ions produced by reaction pd3Heη close to the production threshold. The low background level (<2%) is in good agreement with the data obtained earlier on the SATURNE accelerator.

  • 2.
    Bargholtz, Christoph
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. kärnfysik.
    Gerén, Linda
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. kärnfysik.
    Lindberg, Karl
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. kärnfysik.
    Tegnér, Per-Erik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. kärnfysik.
    Zartova, Irina
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. kärnfysik.
    Calén,, H.
    The Svedberg Laboratory, Uppsala, Sweden.
    Ekström,, C.
    The Svedberg Laboratory, Uppsala, Sweden.
    Fransson,, K.
    The Svedberg Laboratory, Uppsala, Sweden.
    Kupsc, À.
    The Svedberg Laboratory, Uppsala, Sweden.
    Marciniewski,, P.
    The Svedberg Laboratory, Uppsala, Sweden.
    Ruber,, R. J. M.Y.
    The Svedberg Laboratory, Uppsala, Sweden.
    Measurement of h meson decays into lepton-antilepton pairs2008Inngår i: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 77, nr 3, s. 32004-32008Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A search for rare lepton decays of the η meson was performed using the WASA detector at CELSIUS. Two candidates for double Dalitz decay η→e+e-e+e- events are reported with a background of 1.3±0.2 events. This allows to set an upper limit to the branching ratio of 9.7×10-5 (90% CL). The branching ratio for the decay η→e+e-γ is determined to (7.8±0.5stat±0.8syst)×10-3 in agreement with world average value. An upper limit (90% CL) for the branching ratio for the η→e+e- decay is 2.7×10-5 and a limit for the sum of the η→μ+μ-μ+μ- and η→π+π-μ+μ- decays is 3.6×10-4.

  • 3.
    Bargholtz, Christoph
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Tegner, Per-Erik
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Zartova, Irina
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Jacewicz, M.
    Uppsala University, Uppsala, Sweden.
    Johansson, T
    Uppsala University, Uppsala, Sweden.
    Lindberg, Karl
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Keleta, S.
    Uppsala University, Uppsala, Sweden.
    Koch, I.
    Uppsala University, Uppsala, Sweden.
    Kullander, S.
    Uppsala University, Uppsala, Sweden.
    Schönning, K.
    Uppsala University, Uppsala, Sweden.
    Thörngren Engblom, P.
    Uppsala University, Uppsala, Sweden.
    Wolke, M.
    Uppsala University, Uppsala, Sweden.
    Calén, H.
    The Svedberg Laboratory, Uppsala, Sweden.
    Ekström, C.
    The Svedberg Laboratory, Uppsala, Sweden.
    Fransson, K.
    The Svedberg Laboratory, Uppsala, Sweden.
    Marciniewski, P.
    The Svedberg Laboratory, Uppsala, Sweden.
    Ruber, R.J.M.Y.
    The Svedberg Laboratory, Uppsala, Sweden.
    Gustafsson, L.
    Uppsala University, Uppsala, Sweden.
    Höistad, B.
    Uppsala University, Uppsala, Sweden.
    Kupść, A.
    The Svedberg Laboratory, Uppsala, Sweden.
    Measurement of the η -> π+π-e+e- branching ratio2007Inngår i: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 644, nr 5-6, s. 299-303Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 4.
    Zartova, Irina
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Mesonic fusion - pion and eta meson production in light ion nuclear fusion reactions2010Doktoravhandling, 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.

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