Activation Cross section measurements for 5〜7 MeV Neutrons produced with d-D reaction

d-D 反应产生的 5〜7 MeV 中子的活化截面测量

• 批准号: 15560723
• 负责人: SHIBATA Michihiro
• 金额: $ 1.34万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560723/
• 关键词: Van de Graaff accelerator; d-D neutron; D_2 gas target; electrostatic octupole Lenz; beam deflector; Monte Carlo simulation; Activation cross section; MCNP; バンデグラーフ加速器

An electrostatic-triplet quadrupole lens and a beam deflector have been developed for a Van de Graaf(VdG) accelerator KN-3750 at Nagoya University.Activation cross section has been measured with 3-5 MeV neutrons produced with D(d,n)^3He reactions by using a VdG accelerator. In order to focus the d^+ beam smaller than the target window made of Haver foil (2.2μm^t) of the D_2 gas target whose size is 5mm diameter, an electrostatic-triplet quadrupole lens has been developed. By applying the voltage of ± 3kV, it could focus the beam spot about 2 mm, this was observed with a quartz beam viewer. As the result, it can reduce the scattered neutron which generated in undesired area, and it considered to keep good monodiromacity of the neutron.On the other hand, in order to measure the activation cross section of which half-lives of produced nuclei is shorter than 1 s, a beam deflector has been also developed in order to generate pulsed neutrons from the Van de Graaf accelerator. By applying 20kV between two eletrodes, it makes d^+ beam whose pulse width about 30 ms. By measuring the ^<27>Al(p,γ) reaction, the prompt γ-rays were not observed at all with beam-off condition. By using the quadrupole lens and the beam deflector, neutron activation cross sections for short lived-nuclei are scheduled to measure with VdG accelerator.

为名古屋大学的货车德格拉夫（VdG）加速器KN-3750研制了静电三重四极透镜和束流偏转器，并利用VdG加速器测量了D（d，n）^3He反应产生的3-5 MeV中子的活化截面。为了使d^+束流聚焦到直径为5 mm的D_2气体靶的哈弗箔（2.2μm ~（-1））窗口以下，研制了静电三重四极透镜。在± 3 kV电压下，用石英光束观察器观察到，可使束斑聚焦约2 mm。另一方面，为了测量半衰期小于1 s的中子活化截面，研制了一种束流偏转器，用于从货车de Graaf加速器中产生脉冲中子。通过在两个电极之间施加20 kV电压，产生脉宽约30 ms的d^+束流。通过测量^<27>Al（p，γ）反应，在束流关闭条件下根本没有观察到瞬发γ射线。利用四极透镜和束流偏转器，在VdG加速器上测量了短寿命核的中子活化截面。