Abstract

The instrument described consists of a velocity selector ( E× B filter) followed by a more conventional charged-particle spectrograph. The velocity selector sorts the particles vertically in accordance with their velocity and the spectrograph sorts them horizontally in accordance with their momentum/charge ratio. Particles with identical mass/charge ratio fall on sharp slanted lines on the detector with the distance along the line representing kinetic energy. Hence, the instrument measures mass (to about one part in 400) and energy (to about one part in 2000). It is being used to study the mass numbers and velocity distribution of evaporation residues resulting from fusion of intermediate-mass nuclei.

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