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Neutrons; beryllium; Bragg cut-off; high resolution crystal spectrometer

Bragg cut-off for$$(10\bar 10)$$ plane of polycrystalline beryllium of various lengths of 300 and 116 K has been measured with an energy resolution of 5 μeV. The natural width of the cut-off is 12.5±1.5 μeV, independent of temperature and length of beryllium and also of physical characteristics and certain metallurgical treatments of the powder. Such blocks of beryllium would be suitable for designing a ΔT-window spectrometer with resolution ⩾20 μeV. Bragg cut-offs corresponding to (0002) and$$(10\bar 11)$$ planes of beryllium have been separated for the first time. These can also be used for producing additional energy windows in a ΔT-window spectrometer, thus increasing its efficiency.

C L Thaper¹ P S Goyal¹ B A Dasannacharya¹

1. Nuclear Physics Division, Bhabha Atomic Research Centre, Trombay, Bombay - 400 085, India

Published

September 1984