Capture Cross Section Measurements of Long-lived Fission Products in the Resonance Neutron Energy Region

捕获共振中子能量区域长寿命裂变产物的横截面测量

• 批准号: 13680588
• 负责人: KOBAYASHI Katsuhei
• 金额: $ 2.24万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13680588/
• 关键词: Long-lived Fission Products; ^<99>Tc, ^<103>Rh, ^<115>In, ^<127>I, ^<129>I, ^<133>Cs, ^<141>Pr; Resonance Neutron Energy Region; A Few meV to Several Tens of keV; Neutron Capture Cross Section; Neutron Time-of-Flight Method; Prompt Gamma-ray Measure

In the current study, neutron capture cross sections of longlived fission products (LLFPs) have been measured by the neutron time-off-light method using a 12.7 m flight path and a 46 MeV electron linear accelerator (linac) at the Research Reactor Institute, Kyoto University (KURRI). The earlier experimental and the evaluated nuclear data have been investigated by the current results obtainedWe have measured the capture cross sections of Tc-99, Rh-103, In-115, I-127, I-129, Cs-133, and Pr-141 as LLFPs. The nuclides of Tc-99 and I-129 are radioactive materials and the others are non-radio active stable isotopes. Making use of the linac TOF method and the prompt capture gammaray measurement, the capture cross sections have been measured from a few meV to several tens of keV. For the capture cross section measurement, an assembly of 12 pieces of Bi_4Ge_3O_<12> (BGO) scintillators (each size; 5cm x 5cm x 7.5cm) have been used as a total energy absorption detector, which has a through hole t … More o set the capture sample at the center of the detector assembly. The incident neutron energy flux/spectrum has been monitored with the ^<10>B(n, α ) standard cross section, and the relative capture cross section has been normalized to the well known reference value at 0.0253 eV. For the measurement of Rh-103, In-115 and Cs-133, the absolute capture cross section has been obtained by using a saturated count method at the major resonance peakThe earlier experimental and the evaluated data for the above capture cross sections have been compared with the current results. These capture cross sections have not been always satisfied with the data-quality and quantity, especially in the lower energy region below about 10 eV. For some nuclides or the reaction cross sections, no experimental data have been existed or the discrepancies have been seen between the current data and the earlier experimental and the evaluated data. We could provide the useful data for the investigation or the re-evaluation of the capture cross sections Less

在目前的研究中，利用12.7m飞行路径和46 MeV电子直线加速器(直线加速器)，用中子离光法测量了京都大学研究堆研究所的长寿命裂变产物(LLFP)的中子俘获截面。我们测量了~(99)T、~(103)Rh~(-103)、~(115)In、~(127)I、~(129)I、~(133)Cs和~(141)Pr-141的低能电子俘获截面。~(99)T和~(129)I的核素为放射性物质，其余为非放射性稳定同位素。利用直线加速器飞行时间法和即时俘获伽马测量方法，测量了从几meV到几十keV的俘获截面。对于俘获截面的测量，使用了12块Bi4Ge_3O_12(BGO)闪烁体组件(每个尺寸为5 cm×5 cm×7.5 cm)作为总能量吸收探测器，具有通孔t…更多的是将捕获样品放置在探测器组件的中心。用^&lt；10&gt；B(n，α)标准截面监测了入射中子能流/能谱，并将相对俘获截面归一化到0.0253 eV的已知参考值。对于Rh-103、In-115和Cs-133的测量，用饱和计数法在主共振峰获得了绝对俘获截面，并将上述俘获截面的实验和估算数据与目前的结果进行了比较。这些俘获截面在质量和数量上并不总是令人满意，特别是在约10 eV以下的较低能区。对于一些核素或反应截面，没有实验数据，或者当前数据与以前的实验数据和评估数据之间存在差异。我们可以为研究或重新评估俘获截面提供更少的有用数据

项目成果

J. Yoon et al.: "Measurement of Neutron Capture Cross-Section of Indium in the Energy Region from 0.003 eV to 30 keV"Annals of Nuclear Energy. Vol.29/10. 1157-1169 (2002)

J. Yoon 等人：“0.003 eV 至 30 keV 能量区域中铟中子俘获截面的测量”核能年鉴。

Katsuhei Kobayashi 他: "Measurement of Neutron Capture Cross Section of ^<237>Np by Linac Time-of-Flight Method and with Linac-driven Lead Slowing-down Spectrometer"J. Nucl. Sci. Technol.. 39・2. 111-119 (2002)

Katsuhei Kobayashi 等：“利用直线加速器飞行时间法和直线加速器驱动的铅减速光谱仪测量 ^<237>Np” J. Nucl. Sci. 39・2 111-119（2002）

K,Kobayashi et al.: "Measurement of Neutron Capture Cross Section of ^<237>Np by Linac Time-of-Flight Method and with Linac-driven Lead Siowmg-down Spectrometer"J. Nucl. Sci. Technol.. Vol.39, No.2. 111-119 (2002)

K，Kobayashi等人：“通过直线加速器飞行时间方法和直线加速器驱动的铅Siowmg-down光谱仪测量^<237>Np的中子捕获截面”J。

Jungran Yoon ほか: "Measurement of Neutron Capture Cross-Section of Indium in the Energy Region from 0.003eV to 30 keV"Annals of Nuclear Energy. 29・10. 1157-1169 (2002)

Jungran Yoon 等人：“0.003eV 至 30 keV 能量区域中的中子俘获截面的测量”核能年鉴 29・10（2002 年）。

Guinyun Kim ほか: "Measurement of Neutron Capture Cross Section of ^<162>Dy Between 0.003 eV and 10 keV using Total Energy Absorption Detector"Proc. Int'l Conf. on Nuclear Data for Science and Technology. Vol.1. 287-290 (2002)

Guinyun Kim 等人：“使用总能量吸收探测器测量 162Dy 的中子俘获截面”Proc. Intl Conf on Nuclear Data for Science and Technology Vol.1。 287-290（2002）