Abstract
A coincidence type ion-electron converter detector has been developed and used — together with an electrostatic energy-analyser — for precision measurements of the energy distribution of recoil protons from free-neutron decay. The most important aspect of the development was, besides keeping the background below 0.2 counts/s in the presence of a certain radiation background, to achieve a high and energy-independent counting probability for protons with energies tween 100 and 1000 eV. With an acceleration voltage of about 25 kV and A1-foils (20–35 μg/cm 2) as converter, we obtained counting efficiencies of 70 to 85%. The design and performance of the detector system, employing six foils with different sensitive areas, are described and discussed in detail.
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