実験報告書様式（一般利用課題・成果公開利用）

MLF Experimental Report
課題番号 Project No.

提出日 Date of Report
2016/Aug/29
装置責任者 Name of responsible person

2014B0124

実験課題名 Title of experiment
Measurement of energy and angular correlation of gamma raysfrom the thermal neutron capture of enriched Gd-155 andGd-157 Targets
実験責任者名 Name of principal investigator
Makoto Sakuda

Toh Yosuke
装置名 Name of Instrument/（BL No.）
ANNRI (BL04)
実施日 Date of Experiment
2016/Dec/10-16

所属 Affiliation
Okayama University
試料、実験方法、利用の結果得られた主なデータ、考察、結論等を、記述して下さい。（適宜、図表添付のこと）
Please report your samples, experimental method and results, discussion and conclusions. Please add figures andtables for better explanation.
1. 試料 Name of sample(s) and chemical formula, or compositions including physical form.
1) Enriched Gd(157Gd, 157Gd) in Gd2O3 powder (10mg).
2) NaCl powder (10mg).
3) Radioactive sources (60Co, 22Na, 137Cs, 152Eu)

2. 実験方法及び結果 （実験がうまくいかなかった場合、その理由を記述してください。）
Experimental method and results.

If you failed to conduct experiment as planned, please describe reasons.

We conducted an experiment to measure the gamma-rays from Gd(n,gamma) reaction using ANNRI
spectrometer at BL04 beamline. We also took calibration data using beam (Cl(n,gamma)) and radioactivesources. The data-taking were very smooth and successfully finished.
The schedule of the experiment is the following:
10th Dec. 2014, 17:00 – 19:00(11th) : Radioactive sources(60Co, 22Na, 137Cs, 152Eu)
11th Dec. 2014, 19:00 – 14:00(12th) : Enriched Gd(157Gd)
12th Dec. 2014, 14:00 – 18:30: Sodium chloride(NaCl)

12th Dec. 2014, 18:30 – 11:00(13th) : Enriched Gd(155Gd)
13th Dec. 2014, 11:00 – 11:00(14th) : Enriched Gd(157Gd)
14th Dec. 2014, 11:00 – 11:00(15th) : Enriched Gd(155Gd)
15th Dec. 2014, 11:00 – 17:00: Blank(Empty target)

15th Dec. 2014, 17:00 – 18:00: Radioactive source(60Co)

15th Dec. 2014, 18:00 – 9:00(16th) : Enriched Gd(157Gd)
16th Dec. 2014, 9:00 – 10:00: Radioactive source(60Co)

After the experiment, we withdrew our samples from the beamline.
12. 実験方法及び結果（つづき） Experimental method and results (continued)
The data-taking time and the amount of data for each sample are the following:
1) Enriched Gadolinium (157Gd): total 40 hours, 3.4×109 events

2) Enriched Gadolinium (155Gd): total 38 hours, 3.1×109 events

3) Sodium chloride (NaCl): total 4hours, 1.3×108 events

4) Radiation sources (60Co, 22Na, 137Cs, 152Eu) : total 24 hours, 1.2×107 events
5) Blank (Empty target): total 6 hours, 1.3×107 events

The beam intensity and the event rate were checked every two hours and the data-taking went very smoothly.
The data were taken back to Okayama. All the target samples and radioactive sources were returned to JAEA.
The analysis is going on and the preliminary results were presented at the workshops and JPS meetings.
Presentations:1) M.Sakuda（招待講演（国際会議））, K.Hagiwara（ポスター発表）, Y.Yamada, P.Das, I.Ou, T.Mori,
Y.Koshio (Okayama), T.Yano (Kobe),

A.Kimura, H.Harada, N.Iwamoto, S.Nakamura (JAEA) ,Gamma production from thermal neutron capture on natural gadolinium, 155Gd and 157Gd,
Presented at The 13th International Symposium on Origin of Matter and Evolution of Galaxies
Jun.24-27,2015,Beijing2) 萩原開人、山田芳幸、王岩、P.Das、小汐由介、作田誠 （岡大）、矢野孝臣(神戸大)、木村敦、原田秀郎、岩本信之、中村詔司 (JAEA)、ガドリニウムの熱中性子捕獲反応から放出される γ 線デー
タ解析とシミュレーションとの比較、日本物理学会春年会、東北学院大学、2016 年 3 月 19 日3) 萩原開人、山田芳幸、王岩、P.Das、小汐由介、作田誠 （岡大）、矢野孝臣(神戸大)、木村敦、原田秀郎、岩本信之、中村詔司 (JAEA)、ガドリニウムの熱中性子捕獲反応から放出される γ 線デー
タ解析とシミュレーションとの比較、日本物理学会秋年会、宮崎大学、2016 年 9 月 22 日2