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Report No.

Accurate measurements of $$gamma$$-ray emission probabilities

Terada, Kazushi; Nakamura, Shoji  ; Kimura, Atsushi   ; Nakao, Taro; Harada, Hideo   ; Katabuchi, Tatsuya*; Igashira, Masayuki*; Hori, Junichi*

To obtain accurate cross section data, precise determination of the sample mass used in TOF measurements is essential, because uncertainties due to the sample mass are directly propagated to those of measured cross sections over the entire neutron energy region. Therefore, $$gamma$$-ray emission probabilities of $$^{241,243}$$Am, $$^{237,239}$$Np and $$^{233}$$Pa have been precisely measured with gamma- and alpha-ray spectroscopic methods. The activities of the 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 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 2%.



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