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Report No.
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Measurements of $$gamma$$-ray emission probabilities of $$^{241,243}$$Am and $$^{239}$$Np

Terada, Kazushi; Nakamura, Shoji; Nakao, Taro; Kimura, Atsushi; Iwamoto, Osamu; Harada, Hideo ; Takamiya, Koichi*; Hori, Junichi*

$$gamma$$-ray emission probabilities of $$^{241,243}$$Am and $$^{239}$$Np have been precisely measured with $$gamma$$- and $$alpha$$-ray spectroscopic methods. The activities of $$^{243}$$Am samples were determined by measuring alpha particles using a Si semiconductor detector. $$gamma$$-rays emitted from the samples were measured with a planar type High-Purity Germanium (HPGe) detector. An efficiency curve of the Ge detector was derived with uncertainties of 0.7% from 50 to 1332 keV and 1.3% below 50 keV by combining measured efficiencies and Monte Carlo simulation. The $$gamma$$-ray emission probabilities for the major $$gamma$$-rays of these nuclides were determined with uncertainties less than 1.2%.

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Category:Nuclear Science & Technology

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