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Bochum 1998 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 57: Plenar

HK 57.2: Vortrag

Donnerstag, 19. März 1998, 09:45–10:30, P

Probing Few-Body Systems with Bremsstrahlung — •N. Kalantar-Nayestanaki1, J.C.S. Bacelar1, M.J. van Goethem1,2, M.N. Harakeh1, M. Hoefman1,2, H. Huisman1, A. Kugler3,2, H. Löhner1,2, J.G. Messchendorp1, R.W. Ostendorf1,2, S. Schadmand1,4,2, M. Seip1, R. Simon5,2, R. Turrisi1,2, M. Volkerts1, V. Wagner3,2, and H.W. Wilschut1,21KVI, Groningen — 2for the TAPS collaboration — 3NPI, Řež u Prahy — 4Univ. Gießen — 5GSI, Darmstadt

A series of bremsstrahlung measurements have been performed at KVI with the new superconducting cyclotron, AGOR, aiming to investigate the “off-shell” behavior of the nucleon-nucleon interaction at energies below particle-production threshold. Nucleon-nucleon bremsstrahlung is the most fundamental process used for such studies as it involves the strong interaction between two nucleons and the well-known electromagnetic interaction. In addition, the cross section for nucleon-nucleon bremsstrahlung is the basis of all calculations which deal with photon production in heavy-ion collisions.

At KVI, we have used the high-quality polarized beam of 190 MeV protons to perform the most complete experiment to date on proton-proton and proton-deuteron systems. The second system was chosen such that one is able to study all possible bremsstrahlung channels and infer the contribution from the neutron-proton system. High precision cross-section and analyzing-power data have been obtained enabling one to extract information on the structure of the nucleon, the role of virtual nucleon-resonance excitation at these energies, the “off-shell” properties of the T-matrix and the role of two-body effects such as MEC. The measurements were performed with the Small-Angle Large-Acceptance Detector (SALAD) and the Two-Arm Photon Spectrometer (TAPS). Some of the results will be presented along with the most modern calculations which still disagree with the data in specific regions of phase space.

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