A new position state in niobium containing voids
作者： E. Kuramoto , K. Kitajima , M. Hasegawa
DOI: 10.1016/0375-9601(81)90377-7
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摘要: Abstract A remarkably narrow component was found in the angular correlation curve of photon pairs resulting from annihilation positrons neutron-irradiated niobium containing voids. The gamma-ray energy spectrum obtained a NaI(TI) detector did not give evidence 3-γ annihilation. This suggests that voids exist positronium states or free and decay primarily by 2-γ
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