Schematic view of the ion beam experiment.
Measured background spectrum. Some typical photopeaks from K-40, Tl-208, Bi-214, and Pb-214 were observed.
Measured gamma spectra from , carbon, and samples under the helium ion beam.
Emission rates of the gamma ray from on 2.0, 2.25, 3.0, and helium ion beams . Closed circle: present data; open circle: past experimental data.
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