W. Kretschmer
University of Erlangen-Nuremberg
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Featured researches published by W. Kretschmer.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1989
M. Clajus; P. Egun; W. Grüebler; P. Hautle; Alfred P. Weber; P.A. Schmelzbach; W. Kretschmer; M. Haller; C.J. Prenzel; A. Rauscher; W. Schuster; R. Weidmann
A new general method for the precise calibration of beam polarization or analyzing power in spin-12-spin-0 elastic scattering has been developed. This absolute calibration method uses the double scattering technique in connection with modern polarized ion source technology. It is based on an incident beam with at least two different polarization states and is independent of beam energy and scattering angle. The application to p-α elastic scattering at 25.68 MeV and a lab, angle of 117.5° is described. The result is a new determination of the analyzing power to an accuracy of better than 1%, i.e. Ay = 0.8119 ± 0.0076. Systematic errors are extensively discussed.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1985
W. Kretschmer; H. Löh; A. Rauscher; R. Schmitt; W. Schuster
Abstract A magnetic QDQ spectrometer was designed for nuclear double scattering experiments for protons and deuterons with energies up to 19 MeV and 9.5 MeV respectively. We describe the mechanical and electrical performance, the optimizing procedures and the final properties of this device. The main features of this compact spectrometer are a deflection angle of 40°, an energy resolution E / ΔE = 315 and a large accepted solid angle of about 20 msr.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1986
W. Kretschmer; H. Löh; A. Rauscher; R. Schmitt; W. Schuster; W. Stach; N. Stamminger
Abstract We describe the performance of a high pressure (up to 50 bar) 4 He polarimeter designed as the second scatterer in nuclear double-scattering experiments for protons and deuterons at energies up to 12 MeV. The main characteristics are an efficiency of ∼3 × 10 −5 and an effective analyzing power of 0.7–0.8 for protons (measured at a pressure of 20 bar). For deuterons the efficiency is estimated to be of the same order of magnitude whereas the effective analyzing power is about half the magnitude. The polarimeter is equipped with several beam monitoring devices and can be moved along its symmetry axis as well as rotated around it.
Astroparticle Physics | 2006
G. Anton; K. Graf; J. Hößl; A. Kappes; T. Karg; U. Katz; W. Kretschmer; S. Kuch; R. Lahmann; C. Naumann; K Salomon
