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The nuclear isomer 178Hfm2, expected to be the most promising candidate for the gamma-ray medium, is rather difficult to produce in large quantities. There are a few ways to create this isomer, such as the irradiation of 179Hf with high-energy neutrons through the (n,2n) reaction, the irradiation of 176Yb with high-energy α particles through the (α,2n) reaction, the irradiation of 181Ta with protons...
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