Liquid Hydrogen Bubble Chamber for Low Energy Nuclear Physics

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Abstract
The bubble chamber contains 3.2 liters of liquid hydrogen, and has two vertical and two horizontal windows 4 in. in diameter, which are used for 90° stereophotography. The energy and scattering angle of recoil protons from 5–38 Mev can be measured. As a neutron spectrometer, the chamber has an efficiency of 8×10−3 recoil protons in the zero to 30° forward cone per incident neutron, at 22.5 Mev. The peak of the energy distribution has a full width at half maximum of 1.3 Mev, and the background is about 4%. With the present track reading microscope, the average scanning rate is 2000 tracks per man‐week. A full description of the apparatus and track‐measuring equipment is given.