[en] At intermediate energies measurements from a tensor polarized deuteron target are being prepared for the following reactions: the photodisintegration of the deuteron, the elastic pion-deuteron scattering and the elastic electron-deuteron scattering. The experimental situation of the polarization experiments for these reactions is briefly discussed in section 2. In section 3 the definitions of the deuteron polarization and the possibilities to determine the vector and tensor polarization are given. Present tensor polarization values and further improvements in this field are reported in section 4. (orig.)

[en] We have reached 31% deuteron polarization in D- ammonia (ND₃) and 27% in D- butanol (C₄D₁₀O). The dynamic polarization experiments were performed at a magnetic field of 2.5 T in a new type of horizontal dilution cryostat. This dilution cryostat, built for target asymmetry measurements with a photon beam, was developed with special regard to fast cool-down and easy loading of the target material. The cooling power is 5 mW at 0.2 K, 20 mW at 0.3 K and 34 mW at 0.4 K. Starting from room temperature the lowest temperature of 165 mK is reached in about 2 h including the loading of the target material. (orig.)

[en] At intermediate energies measurements from a tensor polarized deuteron target are being prepared for the following reactions: the photodisintegration of the deuteron, the elastic pion-deuteron scattering and the elastic electron-deuteron scattering. The experimental situation of the polarization experiments for these reactions is briefly discussed in section 2. In section 3 the definitions of the deuteron polarization and the possibilities to determine the vector and tensor polarization are given. Present tensor polarization values and further improvements in this field are reported in section 4. (orig./HSI)

No abstract available

No abstract available

[en] A horizontal continuous flow ³He-cryostat was modified to a dilution cryostat with special regard to fast cool-down and easy loading of the target material. This dilution cryostat, built for target asymmetry measurements with a photon beam, has a cooling power of 5 mW at 0.2K, 20 mW at 0.3 K and 34 mW at 0.4 K. The lowest temperature attained was 175 mK. Target asymmetry measurements of the reaction γd → pn at theta/sub CM//sup P/ = 125⁰ were performed using the external photon beam of the Bonn 2.5 GeV electron synchrotron. As target material the authors used D-butanol (C₄D₁₀O) with a maximum deuteron polarization of 27% in a magnetic field of 2.5T. Under the same conditions deuterons in D-ammonia (ND₃) could be polarized up to 30%. 8 references, 3 figures

No abstract available

[en] We have reached 31% deuteron polarization in D-ammonia (ND₃) and 27% in D-butanol (C₄D₁₀O). The dynamic polarization experiments were performed at a magnetic field of 2.5 T in a new type of horizontal dilution cryostat. This dilution cryostat, built for target asymmetry measurements with a photon beam, was developed with special regard to fast cool-down and easy loading of the target material. The cooling power is 5 mW at 0.2 K, 20 mW at 0.3 K and 34 mW at 0.4 K. Starting from room temperature the lowest temperature of 165 mK is reached in about 2 h including the loading of the target material. (orig.)

[en] Dymamic proton polarization measurements in irradiated NH₃ were performed at 1 K and 0.5 K in a magnetic field of 2.5 T. The paramagnetic radicals in the frozen ammonia beads were created by irradiation with 20 MeV electrons from the injection linac of the Bonn 2.5 GeV electron synchrotron. During the irradiation the ammonia beads were cooled in liquid argon at about 90 K. Electron paramagnetic resonance measurements identified the created radicals as NH₂. Samples of NH₃ yielded a maximum proton polarization of 35% at 1 K and 66% at a temperature of 0.5 K. They exhibited short polarization build-up times of 2 min at 1 K and 9 min at 0.5 K. The radiation resistance of the polarization of NH₃ is better than that of butanol. The radiation damage can be repaired by annealing. (orig.)

No abstract available