Precise life-time measurements of EC decay nuclides in capsulated in Fullerene cage in the extreme conditions

极端条件下富勒烯笼中封装的 EC 衰变核素的精确寿命测量

• 批准号: 10640535
• 负责人: OHTSUKI Tsutomu
• 金额: $ 2.11万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640535/
• 关键词: FULLERENE; LIFE-TIME MEASUREMENT; Be-7; 核外電子捕獲崩壊; 元素内包フラーレン; 半減期

In this project, a precise life-time measurements of ィイD17ィエD1Be encapsulated in fullerene cage were performed with extreme conditions, such as 6K temperature. The results measured in 6K were compared with the data for the normal temperature and the data presented so far in the different chemical form.Radioactive endohedral fullerenes, ィイD17ィエD1B@CィイD260ィエD2, were detected using radiochemical and radiochromatographic techniques in the final solvent. Such a ィイD17ィエD1Be atom can penetrate into the CィイD260ィエD2 to produce ィイD17ィエD1Be@CィイD260ィエD2 by a recoil process of the nuclear reactions, ィイD112ィエD1C(γ, αn)ィイD17ィエD1Be or ィイD17ィエD1Li(p,n)ィイD17ィエD1Be.To measure the life-time of ィイD17ィエD1Be encapsulated in the cage, ィイD17ィエD1B@CィイD260ィエD2, the same apparatus in a system (Ge-detector, MCA, Computer, etc.) was used due to the reduction of systematic errors. Data were collected at 8 hours intervals in a MCA system. Analysis was performed using by a least-squares fitting with the CERN program, PAW. Finally we obtained the life-time of 52.98【minus-plus】0.05 day for 6K. It seems that a relatively large change was obtained compared to the value presented so far.

在本项目中，在极端条件下，如6 K温度下，对封装在富勒烯笼中的氘代D17氘代D1 Be进行了精确的寿命测量。在6 K下的测量结果与常温下的数据以及迄今为止以不同化学形式给出的数据进行了比较。在最终溶剂中，使用放射化学和放射色谱技术检测了放射性内嵌富勒烯，即C17D1B@C17D260D1B2。这样的一个氘代D17氘代D1 Be原子可以通过核反应的反冲过程渗透到C氘代D260氘代D2中，产生氘代D17氘代D1Be@C氘代D260氘代D2，氘代D112氘代D1C（γ，αn）氘代D17氘代D1 Be或氘代D17氘代D1 Li（p，n）氘代D17氘代D1 Be。系统中的相同装置（Ge探测器、MCA、计算机等）由于减少了系统误差，在MCA系统中以8小时间隔收集数据。使用CERN程序PAW通过最小二乘拟合进行分析。最终我们获得了6 K的寿命为52.98[正负]0.05天。与迄今为止提出的数值相比，似乎取得了较大的变化。

项目成果

T.Ohtsuki et al.: "Observation of radioactive hetero-fullerenes using radiochemical techniques"Journal of Radioanalytical and Nuclear Chemistry. 239. 365-370 (1999)

T.Ohtsuki 等人：“使用放射化学技术观察放射性杂富勒烯”放射分析与核化学杂志。

T.Ohtsuki et al.: "Formation of dimer, trimer, tetramer of C_<60> and C_<70> by γ-ray, charged-particle irradiation"Chemical Physics.Letters. 300. 661-666 (1999)

T. Ohtsuki等人：“通过γ射线、带电粒子照射形成C_ 60 > 和C_ 70 > 二聚体、三聚体、四聚体”，化学物理快报300. 661-666(1999)。

T. Ohtsuki et al.: "Formation of Dimer, Trimer and Tetramer of C60 and C70 by γ-ray, charged-particle irradiation, and their HPLC separation"Chem. Phys. Lett.. 300. 661-666 (1999)

T. Ohtsuki 等：“通过 γ 射线、带电粒子照射形成 C60 和 C70 的二聚体、三聚体和四聚体及其 HPLC 分离”Chem. Phys. 300. 661-666 (1999)

T. Ohtsuki, K. Ohno: "Systematic study of foreign-atom-incorporated fullerenes by using a nuclear recoil and their MD simulation"Nuclear and Radiochemical Approaches to Fullerene Sciences, Edited by T. Braun, Kluwer Academic Publisher. (in press).

T. Ohtsuki、K. Ohno：“利用核反冲及其 MD 模拟对掺入外来原子的富勒烯进行系统研究”《富勒烯科学的核与放射化学方法》，由 T. Braun 编辑，Kluwer 学术出版社。

K.Masumoto et al.: "Direct preparation of radioactive carbon labeled fullerenes using nuclear reaction"Journal of Radioanalytical and Nuclear Chemistry. 239. 201-206 (1999)

K.Masumoto 等人：“使用核反应直接制备放射性碳标记的富勒烯”放射分析与核化学杂志。