Physics
Scientific paper
Jun 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cgrs.conf..625a&link_type=abstract
CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS. Proceedings of the Eleventh International Symposium. Held 2-6 September 2002
Physics
Scientific paper
The main reasons limiting the bent crystal γ-spectrometer resolution are discussed. New solutions have been proposed and realized during modernization. Angular resolution as small as 0.34 arcsec has been achieved with this spectrometer in the γ-ray energy interval 95 ≤ Eγ ≤ 250 keV. Minimum line width of 0.19 arcsec has been achieved. The most general value conclusion, directly following from this work, is that the angle width of the mosaic block distribution in the quartz crystal (parameter describing the limiting angular resolution of crystal diffraction instruments on its basis) can take value ≤ 0.1 arcsec. The laser-reading device (designed in PNPI) on the basis of high-frequency holographic diffraction gratings is used for the first time. It yields an extremely small optical path (≤ 0.01 cm) and high angular sensitive (last digit in the reading corresponds to 0.002 arcsec).
Alexeev V. L.
Rumiantsev V. L.
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