Nuclear emulsions are ideal for the detection of short lived particles produced by neutrino interactions with matter. There is the possibility to detect vertices and tracks directly and select for properties like missing transverse momentum and close secondary vertices. Further, one can observe reaction channels with low branching ratio and short living decay products.

A scanning microscope is currently set up at the University of Münster for fully automatic and semi-automatic analysis of of nuclear emulsions sheets.

To analyse nearly 10⁶ predicted tracks in the emulsion target of the CHORUS neutrino oscillation experiment in a reasonable time, microscopes with high speed in positioning and data acquisition are needed. The accuracy of the position of the microscope stage is in order of several µm. A fast data acquisition is realised with a CCD Camera (1024x1024 @ 30 frames per second). During scanning, the images are real-time processed with a DSP-based graphic card. To enable full 3-dimensional event reconstruction, the emulsion is scanned layer by layer with a special immersion optic. The control of the whole system is done by a WinNT PC.

• The microscope
• View into Emulsion
• Talk at Fantom School ´98

Münster | Universität Münster | FB Physik | Kernphysik | AG Frekers | Forschung | Mikroskop