Precise Intensity Measurements in the ¹⁴N(n, γ)¹⁵N Reaction as a γ-Ray Intensity Standard up to 11MeV

Itaru MIYAZAKI Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan

Hitoshi SAKANE Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan

Hirokazu TAKAYAMA Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan

Masafumi KASAISHI Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan

Akinori TOJO Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan

Masataka FURUTA Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan

Hiroaki HAYASHI Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan

Osamu SUEMATSU Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan

Hiromichi NARASAKI Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan

Toshiaki SHIMIZU Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan

Michihiro SHIBATA Radioisotope Research Center, Nagoya University, Nagoya, 464-8602, Japan

Kiyoshi KAWADE Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan

Akihiro TANIGUCHI Research Reactor Institute, Kyoto University, Kumatori, 590-0494, Japan

Hideo HARADA Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency, Tokai, 319-1184, Japan

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Abstract

The main γ-ray intensities in the ¹⁴N(n, γ)¹⁵N reaction were determined at an accuracy of 0.3–1.0% based on the intensity balance principle. Measurements were performed at the supermirror neutron guide tube at the Kyoto University reactor (KUR). A liquid nitrogen target and a deuterated melamine (C₃D₆N₆) one were used. We prepared a full-energy-peak efficiency curve by combining the measured and calculated efficiency curves. The previous values widely used as intensity standards agreed with the present results within 4–5% in the 2–11 MeV region, but the ratio to the present values showed a monotonic decrease with the increase in _-ray energy. The results reported by Belgya in 2006 agreed with the present one within 2–3% in the 2–8MeV region; nevertheless, the ratio showed a small oscillation versusγ-ray energy.

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Precise Intensity Measurements in the ¹⁴N(n, γ)¹⁵N Reaction as a γ-Ray Intensity Standard up to 11MeV

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Precise Intensity Measurements in the ¹⁴N(n, γ)¹⁵N Reaction as a γ-Ray Intensity Standard up to 11MeV