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論文

Radioactivity and radionuclides in deciduous teeth formed before the Fukushima-Daiichi Nuclear Power Plant accident

高橋 温*; 千葉 美麗*; 棚原 朗*; 相田 潤*; 清水 良央*; 鈴木 敏彦*; 村上 忍*; 小荒井 一真; 小野 拓実*; 岡 壽崇; et al.

Scientific Reports (Internet), 11(1), p.10355_1 - 10355_11, 2021/05

https://doi.org/10.1038/s41598-021-89910-0
 被引用回数：6 パーセンタイル：41.49(Multidisciplinary Sciences)

The Fukushima-Daiichi Nuclear Power Plant (FNPP) accident released substantial amounts of radionuclides into the environment. We collected 4,957 deciduous teeth, from children living in Fukushima and reference prefectures. Radioactivity was detected in most of the teeth examined and was attributed to the presence of natural radionuclides, including $$^{40}$$K and daughter nuclides in $$^{238}$$U and $$^{232}$$Th series. Additionally, artificial radionuclides, $$^{90}$$Sr and $$^{137}$$Cs, were detected in the teeth obtained from children from Fukushima and the reference prefectures. However, these radionuclides were not believed to have originated from the FNPP accident. Because the teeth examined in the present study were formed before the FNPP accident occurred, the aforementioned findings may serve as important control data for future studies regarding the radioactivity of teeth formed after the FNPP accident.

論文

Thermally altered subsurface material of asteroid (162173) Ryugu

北里 宏平*; Milliken, R. E.*; 岩田 隆浩*; 安部 正真*; 大竹 真紀子*; 松浦 周二*; 高木 靖彦*; 中村 智樹*; 廣井 孝弘*; 松岡 萌*; et al.

Nature Astronomy (Internet), 5(3), p.246 - 250, 2021/03

https://doi.org/10.1038/s41550-020-01271-2
 被引用回数：43 パーセンタイル：96.93(Astronomy & Astrophysics)

2019年4月「はやぶさ2」ミッションは、地球に近い炭素質の小惑星(162173)リュウグウの人工衝撃実験を成功させた。これは露出した地下物質を調査し、放射加熱の潜在的な影響をテストする機会を提供した。はやぶさ2の近赤外線分光器(NIRS3)によるリュウグウの地下物質の観測結果を報告する。発掘された材料の反射スペクトルは、表面で観測されたものと比較して、わずかに強くピークがシフトした水酸基(OH)の吸収を示す。これは、宇宙風化や放射加熱が最上部の表面で微妙なスペクトル変化を引き起こしたことを示している。ただし、このOH吸収の強度と形状は、表面と同様に、地下物質が300$$^{circ}$$Cを超える加熱を経験したことを示している。一方、熱物理モデリングでは、軌道長半径が0.344AUに減少しても、推定される掘削深度1mでは放射加熱によって温度が200$$^{circ}$$Cを超えて上昇しないことが示されている。これは、リュウグウ母天体が放射加熱と衝撃加熱のいずれか、もしくは両方により熱変化が発生したという仮説を裏付けている。

論文

Search for $$alpha$$ decay of $$^{104}$$Te with a novel recoil-decay scintillation detector

Xiao, Y.*; Go, S.*; Grzywacz, R.*; Orlandi, R.; Andreyev, A. N.; 浅井 雅人; Bentley, M. A.*; de Angelis, G.*; Gross, C. J.*; Hausladen, P.*; et al.

Physical Review C, 100(3), p.034315_1 - 034315_8, 2019/09

https://doi.org/10.1103/PhysRevC.100.034315
 被引用回数：16 パーセンタイル：84.48(Physics, Nuclear)

A search for super-allowed $$alpha$$ decay of N=Z nuclei $$^{104}$$Te and $$^{108}$$Xe was carried out using a novel recoil-decay scintillator detector at the tandem accelerator facility at Japan Atomic Energy Agency. Inorganic crystal scintillation material of YAP:Ce (Yttrium Aluminium Perovskite) coupled to position-sensitive photo-multiplier tube (PSPMT) was implemented for the first time in a radioactive decay experiment. Residues from the fusion-evaporation reaction $$^{58}$$Ni+$$^{54}$$Fe$$rightarrow$$ $$^{112}$$Xe$$^*$$ were separated by the JAEA Recoil Mass Separator (RMS) and implanted into the YAP:Ce crystal. $$alpha$$ decays of neutron-deficient tellurium isotopes were identified and proton-emission of $$^{109}$$I was observed. No conclusive evidence was found for the decay chain $$^{108}$$Xe$$rightarrow$$$$^{104}$$Te$$rightarrow$$ $$^{100}$$Sn within 3 days experiment. The cross section limit of 130 pb was obtained for production of two events of $$^{108}$$Xe, about an order of magnitude below the expectation based on earlier cross section measurements and HIVAP calculations.

論文

Study of fission using multi-nucleon transfer reactions

西尾 勝久; 廣瀬 健太郎; Vermeulen, M. J.; 牧井 宏之; Orlandi, R.; 塚田 和明; 浅井 雅人; 豊嶋 厚史; 佐藤 哲也; 永目 諭一郎; et al.

EPJ Web of Conferences, 163, p.00041_1 - 00041_6, 2017/11

https://doi.org/10.1051/epjconf/201716300041
 被引用回数：1 パーセンタイル：61.21(Nuclear Science & Technology)

We are promoting a study of fission using multi-nucleon transfer (MNT) reactions, where excited states in neutron-rich actinide nuclei, which cannot be accessed by particle capture and/or fusion reactions, are populated. Also, the excited states in the fissioning nucleus are widely populated by the MNT reactions, from which effects of excitation energy on fission properties can be investigated. Experiments were carried out at the JAEA tandem facility in Tokai, Japan. We studied reactions using the $$^{18}$$O beam and several actinide target nuclei such as $$^{232}$$Th, $$^{238}$$U, $$^{237}$$Np, $$^{248}$$Cm. Ejectile nucleus was identified by a silicon $$Delta$$E-E telescope to identify transfer channel and hence the compound nucleus. Fission fragments were detected by multi-wire proportional counters, and fission fragment mass distributions (FFMDs) were measured for each isotope. Measured FFMDs are reproduced by a calculation based on the fluctuation-dissipation model, and importance of multi-chance fission concept is investigated. Fission fragment angular distribution relative to the recoil direction suggested the increase of the spin of the fissioning nucleus with the number of transferred nucleons.

論文

Simultaneous measurement of neutron-induced fission and capture cross sections for $$^{241}$$Am at neutron energies below fission threshold

廣瀬 健太郎; 西尾 勝久; 牧井 宏之; 西中 一朗*; 太田 周也*; 永山 達郎*; 田村 信行*; 後藤 真一*; Andreyev, A. N.; Vermeulen, M. J.; et al.

Nuclear Instruments and Methods in Physics Research A, 856, p.133 - 138, 2017/06

https://doi.org/10.1016/j.nima.2016.12.021
 被引用回数：5 パーセンタイル：44.54(Instruments & Instrumentation)

Fission and capture reactions were simultaneously measured in the neutron-induced reactions of $$^{241}$$Am at J-PARC. Data were taken with the TOF method in $$E_n$$ = 0.1$$sim$$20 eV. The fission events were observed by detecting prompt fission neutrons using liquid organic scintillators. The capture reaction was measured by detecting $$gamma$$ rays from the compound nuclei using the same detectors, where the prompt fission neutrons and capture $$gamma$$ rays were separated by a pulse shape analysis. The cross sections were obtained by normalizing the relative yields at the first resonance to evaluations or other experimental data. The ratio of the fission to capture cross sections at each resonance is compared with those from an evaluated nuclear data library and other experimental data. Some differences were found between the present values and the library/literature values at several resonances.

論文

Cesium adsorption/desorption behavior of clay minerals considering actual contamination conditions in Fukushima

向井 広樹*; 廣瀬 農*; 甕 聡子*; 菊池 亮佑*; 田野井 慶太朗*; 中西 友子*; 矢板 毅; 小暮 敏博*

Scientific Reports (Internet), 6, p.21543_1 - 21543_7, 2016/02

https://doi.org/10.1038/srep21543
 被引用回数：133 パーセンタイル：96.62(Multidisciplinary Sciences)

Cesium adsorption/desorption experiments for various clay minerals, considering actual contamination conditions in Fukushima, were conducted using the $$^{137}$$Cs radioisotope and an autoradiography using imaging plates (IPs). An aliquot containing 0.185 -1.85 Bq of $$^{137}$$Cs was dropped onto a substrate where various mineral particles were arranged. It was found that partially-vermiculitized biotite, which is termed "weathered biotite" (WB) in this study, from Fukushima sorbed $$^{137}$$Cs far more than the other clay minerals (fresh biotite, illite, smectite, kaolinite, halloysite, allophane, imogolite) on the same substrate. Cs-sorption to WB continued for about one day, whereas that to ferruginous smectite was completed within one hour. The sorbed $$^{137}$$Cs in WB was hardly leached with hydrochloric acid at pH 1, particularly in samples with a longer sorption time. The presence/absence of WB sorbing radiocesium is a key factor affecting the dynamics and fate of radiocesium in Fukushima.

論文

Density and X-ray emission profile relationships in highly ionized high-Z laser-produced plasmas

吉田 健祐*; 藤岡 慎介*; 東口 武史*; 鵜篭 照之*; 田中 のぞみ*; 川崎 将人*; 鈴木 悠平*; 鈴木 千尋*; 富田 健太郎*; 廣瀬 僚一*; et al.

Applied Physics Letters, 106(12), p.121109_1 - 121109_5, 2015/03

https://doi.org/10.1063/1.4916395
 被引用回数：10 パーセンタイル：38.07(Physics, Applied)

We present a benchmark measurement of the electron density profile in the region where the electron density is 10$$^{19}$$ cm$$^{-3}$$ and where the bulk of extreme ultraviolet (EUV) emission occurs from isotropically expanding spherical high-Z gadolinium plasmas. It was found that, due to opacity effects, the observed EUV emission is mostly produced from an underdense region. We have analyzed time-resolved emission spectra with the aid of atomic structure calculations, and find that while the multiple ion charge states around 18+ during the laser pulse irradiation.

論文

X-ray absorption spectroscopy and novel electronic properties in heavy fermion compounds YbT$$_{2}$$Zn$$_{20}$$ (T: Rh and Ir)

本多 史憲*; 広瀬 雄介*; 三宅 厚志*; 水牧 仁一朗*; 河村 直己*; 筒井 智嗣*; 綿貫 徹; 渡辺 真仁*; 竹内 徹也*; 摂待 力生*; et al.

Journal of Physics; Conference Series, 592(1), p.012021_1 - 012021_5, 2015/03

https://doi.org/10.1088/1742-6596/592/1/012021
 被引用回数：3 パーセンタイル：72.17(Physics, Atomic, Molecular & Chemical)

重い電子系化合物YbT$$_{2}$$Zn$$_{20}$$(T: Rh and Ir)について、X線吸収分光法によりYb価数観察を行った。いずれの化合物でもYb価数は温度依存性を示し、約100K以下で冷却とともにYb価数が減少する変化が見られた。これは、同型化合物であるYbCo$$_{2}$$Zn$$_{20}$$において温度依存性が見られないこととは対照的な結果である。

論文

Misassigned neutron resonances of $$^{142}$$Nd and stellar neutron capture cross sections

片渕 竜也*; 松橋 泰平*; 寺田 和司; 井頭 政之*; 水本 元治*; 廣瀬 健太郎; 木村 敦; 岩本 信之; 原 かおる*; 原田 秀郎; et al.

Physical Review C, 91(3), p.037603_1 - 037603_5, 2015/03

https://doi.org/10.1103/PhysRevC.91.037603
 被引用回数：8 パーセンタイル：50.7(Physics, Nuclear)

Time-of-flight spectra of the neutron capture events of $$^{142}$$Nd were measured using a spallation neutron source at the Japan Proton Accelerator Research Complex. The first six resonances of $$^{142}$$Nd reported in a previous work were not observed. The experimental results and cross-search of resonance energies in nuclear data libraries suggested that resonances of impurity nuclide $$^{141}$$Pr have been mistakenly assigned as $$^{142}$$Nd in the previous experiment. To investigate the impact of non-existence of the resonances to the s-process nucleosynthesis model, the Maxwellian averaged neutron capture cross sections with and without the misassigned resonances were compared.

論文

Response function for the measurement of (n,$$gamma$$) reactions with the ANNRI-Cluster Ge detectors at J-PARC

原 かおる; 後神 進史*; 原田 秀郎; 廣瀬 健太郎; 木村 敦; 金 政浩*; 北谷 文人; 小泉 光生; 中村 詔司; 藤 暢輔; et al.

JAEA-Conf 2014-002, p.88 - 92, 2015/02

https://doi.org/10.11484/jaea-conf-2014-002

Recently, neutron shields of a large Ge detector array at the Accurate Neutron-Nucleus Reaction Measurement Instrument (ANNRI) in the Japan Proton Accelerator Research Complex (J-PARC) were modified to suppress the background from boron rubber sheets to enriched $$^{6}$$LiF tiles. For the new experimental set-up, efficiencies and response functions of the cluster Ge detectors with the BGO anti-coincidence detectors were measured with $$gamma$$-rays from standard sources and prompt $$gamma$$-rays from the $$^{28}$$Si(n,$$gamma$$) and $$^{35}$$Cl(n,$$gamma$$) reactions. The simulation parameters were adjusted with the EGS5 code so as to reproduce the data set of efficiencies and response functions. Based on this information, a pulse height weighting function will be deduced in the energy range of 0.1-10 MeV.

論文

Efficient extreme ultraviolet emission from one-dimensional spherical plasmas produced by multiple lasers

吉田 健祐*; 藤岡 慎介*; 東口 武史*; 鵜篭 照之*; 田中 のぞみ*; 大橋 隼人*; 川崎 将人*; 鈴木 悠平*; 鈴木 千尋*; 富田 健太郎*; et al.

Applied Physics Express, 7(8), p.086202_1 - 086202_4, 2014/08

https://doi.org/10.7567/APEX.7.086202
 被引用回数：29 パーセンタイル：73.72(Physics, Applied)

半導体デバイスには更なる高性能化, 小型化が求められておりノードの微細化は急務となっている。さらなる細線化を目指して波長6.5-6.7nmの極端紫外光源の研究開発に着手している。極端紫外光源を実現させるために最も重要な開発課題は、光源の高出力化であり、本研究では球状ターゲットにレーザーを球対称に12方向から同時にターゲットに照射することで球対称なプラズマを生成させ6.5-6.7nm帯域の放射特性を調べた。本実験では変換効率のレーザー照射強度依存性をスペクトル, 電子密度, イオン価数, 電子温度など様々なパラメータから考察することでリソグラフィに求められる光源として最適なプラズマの生成条件の研究を行った。ガドリニウムターゲットの最適なレーザー照射強度に対する変換効率として、これまでの研究報告の中で最高の0.8%が得られた。

論文

Measurements of neutron capture cross sections of $$^{112}$$Sn and $$^{118}$$Sn with J-PARC/MLF/ANNRI

木村 敦; 廣瀬 健太郎; 中村 詔司; 原田 秀郎; 原 かおる; 堀 順一*; 井頭 政之*; 加美山 隆*; 片渕 竜也*; 木野 幸一*; et al.

Nuclear Data Sheets, 119, p.150 - 153, 2014/05

https://doi.org/10.1016/j.nds.2014.08.042
 被引用回数：5 パーセンタイル：38.03(Physics, Nuclear)

The neutron-capture cross sections of $$^{112}$$Sn and $$^{118}$$Sn were measured by the time-of-flight method in the energy range from 10 meV to 2 keV with an array of germanium detectors in ANNRI at J-PARC. The preliminary results of the neutron-capture cross sections for $$^{112}$$Sn and $$^{118}$$Sn were obtained by normalizing the relative cross sections to the thermal cross section measured by Krane and to the evaluated value of JENDL-4.0 at the 47.05-eV resonance, respectively. Twelve new resonances for $$^{112}$$Sn were observed, whereas the 21.02-, 40.38- and 166-eV resonances for $$^{112}$$Sn and the 289-eV resonance for $$^{118}$$Sn which are listed on JENDL-4.0 and/or ENDF/B VII.1 were not observed. The prompt $$gamma$$-ray distributions gated at the $$^{112}$$Sn and $$^{118}$$Sn resonances were obtained. Twenty-three new prompt $$gamma$$-ray emissions were observed in the $$^{112}$$Sn (n,$$gamma$$) reactions.

論文

Cross section measurements of the radioactive $$^{107}$$Pd and stable $$^{105,108}$$Pd nuclei at J-PARC/MLF/ANNRI

中村 詔司; 木村 敦; 北谷 文人; 太田 雅之; 古高 和禎; 後神 進史*; 原 かおる; 原田 秀郎; 廣瀬 健太郎; 金 政浩*; et al.

Nuclear Data Sheets, 119, p.143 - 146, 2014/05

https://doi.org/10.1016/j.nds.2014.08.040
 被引用回数：10 パーセンタイル：57.34(Physics, Nuclear)

長寿命放射性核種$$^{107}$$Pd、及び不純物として含まれている安定核種$$^{105,108}$$Pdの中性子捕獲断面積を測定した。J-PARCの物質・生命科学実験施設(MLF)のBL04に整備された中性子核反応実験装置(ANNRI)を用いて、飛行時間法により熱領域から300eVの中性子エネルギーに対して、中性子捕獲断面積を測定した。報告されていた幾つかの共鳴が、$$^{107}$$Pdに起因しないことなど、共鳴に関する新たな知見が得られた。

論文

Capture cross-section measurement of $$^{241}$$Am(n,$$gamma$$) at J-PARC/MLF/ANNRI

原田 秀郎; 太田 雅之; 木村 敦; 古高 和禎; 廣瀬 健太郎; 原 かおる; 金 政浩*; 北谷 文人; 小泉 光生; 中村 詔司; et al.

Nuclear Data Sheets, 119, p.61 - 64, 2014/05

https://doi.org/10.1016/j.nds.2014.08.019
 被引用回数：19 パーセンタイル：76.05(Physics, Nuclear)

Accurate determination of the neutron capture cross sections of radioactive nuclei is required in the fields of nuclear waste transmutation study and also nuclear astrophysics. The accurate neutron-nucleus reaction measurement instrument (ANNRI), which was installed in the materials and life science experimental facility (MLF) at the J-PARC, is expected to satisfy these demands. The capture cross section of $$^{241}$$Am was measured using a high efficiency Ge spectrometer installed in the ANNRI. By taking advantage of its high $$gamma$$-ray energy resolution, background components were precisely subtracted. The capture cross section of $$^{241}$$Am was deduced for a neutron energy region between 0.01 and 20 eV. The obtained cross section and the Westcott factor are compared with the preceding experiments and evaluated values.

論文

Measurements of capture $$gamma$$ rays from the neutron resonances of $$^{74}$$Se and $$^{77}$$Se at the J-PARC/MLF/ANNRI

堀 順一*; 八島 浩*; 中村 詔司; 古高 和禎; 原 かおる; 原田 秀郎; 廣瀬 健太郎; 木村 敦; 北谷 文人; 小泉 光生; et al.

Nuclear Data Sheets, 119, p.128 - 131, 2014/05

https://doi.org/10.1016/j.nds.2014.08.036
 被引用回数：4 パーセンタイル：32.98(Physics, Nuclear)

本研究では、$$^{74}$$Seと$$^{77}$$Seの中性子共鳴からの捕獲$$gamma$$線を測定した。$$^{74}$$Seは、簡単な殻模型から2p$$_{1/2}$$軌道まで中性子が占有されている偶-偶核であるので、プライマリ$$gamma$$線遷移の始状態と終状態間の強い相関が予想される。$$^{74}$$Seは、安定Se同位体の中で唯一の奇数核であるので、同じ奇数核である$$^{79}$$Seの評価に資する情報を含んでいると期待される。J-PARC、物質・生命科学実験施設(MLF)の中性子核反応実験装置(ANNRI)に整備した4$$pi$$ Geスペクトロメータを用いて、飛行時間法により測定を行った。$$^{74}$$Seの27eV共鳴、及び$$^{77}$$Seの113eV, 212eV, 291eV, 342eV, 690eV及び864eV共鳴に対応する$$gamma$$線波高スペクトルを得た。これらのプライマリ遷移$$gamma$$線の相対強度を求め、報告されている実験データと比較を行った。$$^{74}$$Seの27eV共鳴について、293keV準位への強いプライマリ遷移が観測された。$$^{77}$$Seについては、共鳴ごとに全く異なる崩壊パターンを見いだした。

論文

Cross section measurement of $$^{237}$$Np$$(n,gamma)$$ at J-PARC/MLF/ANNRI

廣瀬 健太郎; 古高 和禎; 原 かおる; 原田 秀郎; 堀 順一*; 井頭 政之*; 加美山 隆*; 片渕 竜也*; 木村 敦; 金 政浩*; et al.

Nuclear Data Sheets, 119, p.48 - 51, 2014/05

https://doi.org/10.1016/j.nds.2014.08.015
 被引用回数：1 パーセンタイル：10.25(Physics, Nuclear)

The cross section of the $$^{237}$$Np$$(n,gamma)$$ reaction has been measured in an energy range from 10 meV to 1 keV at the Japan Proton Accelerator Research Complex (J-PARC). The NaI(Tl) spectrometer installed in the accurate neutron-nucleus reaction measurement instrument (ANNRI) was used for the measurement. The relative cross section was obtained using the neutron spectrum measured by the $$^{10}$$B$$(n,alpha_1)$$ reaction. The absolute value of the cross section was deduced by normalizing the relative cross section to the evaluated value in JENDL-4.0 at the first resonance. In this presentation, the obtained results for the cross section, the Westcott factor and the resonance analysis are reported. This work was supported by JSPS KAKENHI Grant Number 22226016.

論文

Energy resolution of pulsed neutron beam provided by the ANNRI beamline at the J-PARC/MLF

木野 幸一*; 古坂 道弘*; 平賀 富士夫*; 加美山 隆*; 鬼柳 善明*; 古高 和禎; 後神 進史*; 原 かおる; 原田 秀郎; 原田 正英; et al.

Nuclear Instruments and Methods in Physics Research A, 736, p.66 - 74, 2014/02

https://doi.org/10.1016/j.nima.2013.09.060
 被引用回数：31 パーセンタイル：91.8(Instruments & Instrumentation)

We studied the energy resolution of the pulsed neutron-beam of Accurate Neutron-Nucleus Reaction Measurement Instrument (ANNRI) at the Japan Proton Accelerator Research Complex/Materials and Life Science Experimental Facility (J-PARC/MLF). A simulation in the energy region from 0.7 meV to 1 MeV has been performed. Moreover, measurements have been done in the thermal and epithermal energies. The neutron energy resolution at ANNRI, which is determined by the time-of-flight technique, depends on the time structure of the neutron pulse. We obtained the neutron energy resolution as a function of the neutron energy by the simulation in the two operation modes of the neutron source: double and single bunch modes. In the double bunch mode, the resolution deteriorates above about 10 eV because the time structure of the neutron pulse splits into two peaks. The time structures at 13 energy points by measurements in the thermal energy region are in agreement with those of the simulation. In the epithermal energy region, the time structures at 17 energy points were obtained by measurements. The FWHM values of the time structures by the simulation and measurements are almost consistent. In the single bunch mode, the energy resolution is better than about 1% between 1 meV and 10 keV at the neutron source operation of 17.5 kW.

論文

Cross section measurement of $$^{117}$$Sn$$(n,gamma)$$ using ANNRI-NaI(Tl) spectrometer at J-PARC

廣瀬 健太郎; 古高 和禎; 原 かおる; 原田 秀郎; 木村 敦; 北谷 文人; 小泉 光生; 中村 詔司; 大島 真澄; 藤 暢輔; et al.

JAEA-Conf 2013-002, p.173 - 178, 2013/10

https://doi.org/10.11484/jaea-conf-2013-002

The cross section for $$^{117}$$Sn$$(n,gamma)$$ reaction has been measured in the neutron energy from 1eV to 1keV using the ANNRI-NaI(Tl) spectrometer at J-PARC/MLF. The sample used in the present experiment was metal tin enriched in $$^{117}$$Sn by 87%. The impurities of $$^{116}$$Sn and $$^{118}$$Sn were 9.3% and 3%, respectively. In the data analysis, the background of the frame-overlap neutrons and the scattered neutrons were subtracted. Comparison with the evaluation of JENDL-4.0 and ENDF/B-VII.1 will be presented in the poster session.

論文

Measurements and simulations of the responses of the cluster Ge detectors to $$gamma$$ rays

原 かおる; 後神 進史*; 原田 秀郎; 廣瀬 健太郎; 木村 敦; 金 政浩*; 北谷 文人; 小泉 光生; 中村 詔司; 藤 暢輔

JAEA-Conf 2013-002, p.161 - 166, 2013/10

https://doi.org/10.11484/jaea-conf-2013-002

For a pulse-height weighting technique, responses of two cluster Ge detectors with BGO anti-coincidence detectors have been measured at the Accurate Neutron-Nucleus Reaction Measurement Instrument (ANNRI) in the Japan Proton Accelerator Research Complex (J-PARC). $$^{60}$$Co and $$^{137}$$Cs standard sources were used for low-energy region (E$$_{gamma}$$ $$<$$ 2 MeV). Prompt $$gamma$$-rays emitted from the $$^{35}$$Cl(n,$$gamma$$)$$^{36}$$Cl reactions were used for high-energy region (E$$_{gamma}$$ $$sim$$ 8 MeV). The measured spectra, peak efficiencies, and peak-to-total ratio were compared to simulations which were calculated by using the EGS5 code in the energy range 0.5-10 MeV. The response function will be applied to a data analysis in neutron capture reaction measurements at ANNRI.

論文

Cross-section measurement of $$^{237}$$Np$$(n,gamma)$$ from 10 meV to 1 keV at Japan Proton Accelerator Research Complex

廣瀬 健太郎; 古高 和禎; 原 かおる; 原田 秀郎; 木村 敦; 金 政浩*; 北谷 文人; 小泉 光生; 中村 詔司; 大島 真澄; et al.

Journal of Nuclear Science and Technology, 50(2), p.188 - 200, 2013/02

https://doi.org/10.1080/00223131.2013.757470
 被引用回数：28 パーセンタイル：89.76(Nuclear Science & Technology)

J-PARC/ANNRIに設置したNaI検出器を用いて、$$^{237}$$Np$$(n,gamma)$$反応断面積を中性子エネルギー10meVから1keVにおいて測定した。断面積のエネルギー依存性は$$^{10}$$B$$(n,alpha)$$反応をリファレンスとして求め、絶対値はJENDL-4.0評価済データを用い、第1共鳴で規格化することで得た。得られた熱中性子捕獲断面積は(176.7$$pm$$4.7)bであった。また、$$kT$$=25.3meVに対するマクスウェル平均断面積は(174.6$$pm$$5.1)bであった。マクスウェル平均断面積を求める際、10meV以下での断面積はJENDL-4.0を参照した。これらの結果から、Westcottの$$g$$-factorとして0.988$$pm$$0.010が得られた。これは最新のLANLの測定値0.944$$pm$$0.035に比べ、約5%大きな結果である。

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