Abstract
DISCRETE energy-levels have been observed in arsenic-75 at excitation energies between about 8.0 and 10.0 MeV. The experimental procedure was as follows. Targets of separated germanium-74 of thickness 100 µgm./cm.2 and 10 µgm./cm.2 deposited on tungsten backings (prepared at the Atomic Energy Research Establishment, Harwell) were irradiated by the proton beam from a pressurized electrostatic generator1, and the γ-rays emitted were detected by means of a thallium-activated sodium iodide crystal 36 mm. diameter by 25 mm. long coupled optically to a photomultiplier of type 6262A. The output from the photomultiplier was fed into a scaler via a cathode follower and linear amplifier of type 1008.
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References
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CHICK, D., HUNT, S. Excited Levels in Arsenic-75 produced by Radiative Capture of Protons by Germanium-74. Nature 180, 88–89 (1957). https://doi.org/10.1038/180088a0
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DOI: https://doi.org/10.1038/180088a0
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