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HK: Hadronen und Kerne
HK 66: Hadronic Probes VII, Bremsstrahlung
HK 66.10: Talk
Thursday, March 19, 1998, 16:45–17:00, G
Measurements of the virtual-photon capture p+d → 3He +γ* — •J.G. Messchendorp1, J.C.S. Bacelar1, M.J. van Goethem1,2, M.N. Harakeh1, M. Hoefman1,2, H. Huisman1, N. Kalantar - Nayestanaki1, A. Kugler3,2, H. Löhner1,2, R.W. Ostendorf1,2, S. Schadmand1, R. Simon4,2, M. Volkerts1, V. Wagner3,2, H.W. Wilschut1,2, and A. van der Woude1 — 1KVI, Groningen — 2for the TAPS collaboration — 3NPI, Řež u Prahy — 4GSI, Darmstadt
The virtual-photon (e+e−) capture process in the few-body system is an exclusive probe of the NN potential. By measuring the full leptonic phase space, the nuclear currents are decomposed into transverse (T), longitudinal (L) and the interference (TT, LT) terms.
The preliminary analyses of the data obtained from the reaction p+d → 3He +e+e−, with a polarized beam of 190 MeV, provided by the new super-conducting cyclotron AGOR, will be discussed. The two leptons were detected by the Two-Arm Photon Spectrometer (TAPS). The charged particle veto detectors of TAPS provided the identification of the leptons. With the geometry used in the present experiment, only invariant masses above 10 MeV/c2 are measurable. This data is therefore complementary to the data obtained at Uppsala [1], which covered the invariant mass range up to 8 MeV/c2. The two data sets will be compared.
[1] R. Johansson et al., Internal Report TSL/ISV-97-0172