不安定錫同位体におけるアンタイ・アナログ巨大双極子共鳴研究

不稳定锡同位素的解开模拟巨偶极子共振研究

• 批准号: 14F04202
• 负责人: 笹野 匡紀
• 金额: $ 1.47万
• 依托单位: Institute of Physical and Chemical Research
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2014
• 资助国家: 日本
• 起止时间: 2014-04-25 至 2016-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14F04202/
• 关键词: ガモフ・テラー巨大共鳴; 中性子検出器; 不安定核物理学; Giant resonances; dipole resonance; unstable nuclei; neutron skin

The main goal for the FY2015 was the development of the prototype of a novel low-energy neutron detector to investigate the spin-isospin responses of exotic radioactive nuclei using (p,n) reactions in inverse kinematics. To achieve higher signal-to-noise ratio in neutron detection, the online separation of neutrons and gammas is an option. This endeavour fits to the general trend at radioactive beam facilities: to improve the experimental devices to handle the higher beam intensities despite the limitation of DAQ or storage capability. The fellow, L. Stuhl has constructed a prototype detector. The test of the pulse shape discrimination capability was performed by irradiating the scintillator with a 252Cf source and using analog electronics with charge integration method. He successfully realized the discrimination of the signals coming from neutrons and gamma rays. To quantify the efficiency of the separation the Figure of Merit (FoM) was obtained. With our detector the 80% of the FoM value known from literature have been reached. The lower FoM values obtained in current measurements are essentially due to the larger scintillator volume of the new detector that probably blurs the light collection. As a next step the digital readout will be developed.

2015 财年的主要目标是开发新型低能中子探测器原型，以利用逆运动学中的 (p,n) 反应研究奇异放射性核的自旋-同位旋响应。为了在中子检测中实现更高的信噪比，中子和伽马的在线分离是一种选择。这一努力符合放射性束设施的总体趋势：改进实验设备以处理更高的束强度，尽管数据采集或存储能力有限。 L. Stuhl 研究员建造了一个探测器原型。脉冲形状辨别能力的测试是通过用252Cf源照射闪烁体并使用模拟电子学和电荷积分方法来进行的。他成功地实现了中子和伽马射线信号的辨别。为了量化分离效率，获得了品质因数 (FoM)。使用我们的探测器，已经达到了文献中已知的 FoM 值的 80%。当前测量中获得的较低 FoM 值主要是由于新探测器的闪烁体体积较大，这可能会模糊光收集。下一步将开发数字读数装置。

项目成果

A new low-energy neutron detector for (p,n) experiments with pulse shape discrimination properties

一种用于 (p,n) 实验的新型低能中子探测器，具有脉冲形状辨别特性

• 发表时间: 2015
• 作者: L. Stuhl;L. Stuhl
• 通讯作者: L. Stuhl

Investigation of spin-isospin collectivity in asymmetric nuclear matter

不对称核物质中自旋-同位旋集体的研究

• 发表时间: 2015
• 作者: L. Stuhl;L. Stuhl;L. Stuhl
• 通讯作者: L. Stuhl

A neutron spectrometer for studying giant resonances with (p,n) reactions in inverse kinematics

用于研究逆运动学中 (p,n) 反应巨共振的中子能谱仪

• 发表时间: 2015
• 作者: L. Stuhl;L. Stuhl;L. Stuhl;Laszlo Stuhl
• 通讯作者: Laszlo Stuhl

Around the Nucleus

核心周围

• 发表时间: 2015
• 作者: L. Stuhl