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HK: Hadronen und Kerne
HK 15: Hadronic Probes II, Nucleon-Nucleon Interaction
HK 15.5: Talk
Monday, March 16, 1998, 18:45–19:00, C
Ay of the elastic p→+d reaction at 190 MeV — •M. Seip, A.G. Drentje, M.J. van Goethem, M.N. Harakeh, M. Hoefman, H. Huisman, N. Kalantar-Nayestanaki, H.R. Kremers, J.G. Messchendorp, M. Volkerts, S.Y. van der Werf, and H.W. Wilschut — KVI, Groningen, The Netherlands
A beam-polarimeter for medium energy protons and deuterons (E=100-200 MeV)
has been constructed. Its operation is based on the p→+d and
d→+p elastic scattering with coincident detection of both particles
in 4 independent planes. The 16 detectors have a phoswich construction to
ensure particle identification.
The analyzing power, Ay, of p→+d elastic scattering has been
measured at 190 MeV for CM-angles of 25∘ to 115∘ in
two planes, monitored by p→+p elastic scattering in the two other planes.
The target was mixed CH2/CD2. This allowed for simultaneous
extraction of Ay(p→,d) and the beam polarizations, P↑,
P↓ and P0. The latter is the rest polarization, when both
the weak- and strong-field transitions of the polarized-ion source were off.
It is markedly different from zero due to the relatively low magnetic field
in the ECR ionizer. The analyzing power is compared to
calculations based on 3N Bonn-potential [1].
- 1. H. Witała, private communication 1997