| Autor: |
J. Ahrens, K.-J. Dietz, T. Kettner, E. Reichert, D. Conrath, Werner Heil, A. Bornheimer, W. Hartmann, H.-J. Gessinger, W. Gasteyer, L. Koch, H. G. Andresen, H.-J. Kluge, W. Achenbach, B. Wagner, F. Neugebauer, J. Jethwa, R. Neuhausen, H. Kessler, Ernst W. Otten, F. P. Schäfer |
| Rok vydání: |
1986 |
| Předmět: |
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| Zdroj: |
Weak and Electromagnetic Interactions in Nuclei ISBN: 9783642716911 |
| DOI: |
10.1007/978-3-642-71689-8_123 |
| Popis: |
In the energy range of about 300 MeV, available at the Mainz- Linac, quasi-elastic scattering dominates the total cross section at backward scattering angles. This process can therefore be detected efficiently by a gas Cerenkov-counter with large solid angle. This is a prerequisit for experiments on parity violation due to the very small asymmetry effect being of the order of 1|10-5 at these energies [1]. The counting system built, consists of 12 elliptical mirrors, imaging the Cerenkov photons seen in target direction onto photomultipliers. The mirrors cover the full azimuth for polar angles 115°≦ϑ≦145°, thus covering 20% of 4π (Fig. 1). The detector has been proved to yield a statistical asymmetry error limit of 1|10-5 within half an hour running time at an average current of 20 µA. Under stable Linac conditions the error histogram is Gaussian and its width is compatible with the number of scattered electrons (Fig. 2). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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