用中等能量离子辐射方法研究C_(60)膜结构变化

在２００ｋｅＶ重离子加速器上，使用１２０ｋｅＶ的Ｈ＋，Ｈｅ＋，Ｎ＋，Ａｒ＋等离子对Ｃ６０分子薄膜进行了辐射处理，对辐射后Ｃ６０膜的Ｒａｍａｎ谱进行了系统地分析研究．离子辐射会影响Ｃ６０薄膜的结构，不同的辐射注入剂量会使Ｃ６０分子薄膜产生聚合和非晶碳化现象，这一现象的产生与辐射离子的剂量大小有关，并存在一剂量阈值．研究表明Ｃ６０分子的聚合与辐射碰撞过程中的电子能损有关，而Ｃ６０薄膜非晶碳化现象则主要受核能损的影响In this paper, the C 60 films have been implanted at room temperature with 120keV H +, He +,N + and Ar + ions by using a 200keV heavy ion accelerator. After that, the sample are investigated with Raman spectra. The results show that the irradiation by medium energy ion could make C 60 films polymerization and amorphism, also there is certain threshold dose for this phenomena, which relate to interaction between the irradiation ion and C 60 molecule. Preliminary explan..

离子注入对C_(60)薄膜结构的影响

利用高能离子注入技术系统地研究了不同剂量、不同种类离子注入对Ｃ６０薄膜结构的影响，并利用Ｒａｍａｎ光谱对其结构进行分析．结果表明：中等能量的离子注入会影响Ｃ６０薄膜的结构，使Ｃ６０分子薄膜产生聚合和非晶碳化现象，但上述现象的出现与注入离子的剂量大小有关，并存在一注量阈值，只有在此阈值之上，Ｃ６０薄膜结构才发生改变，研究表明这与注入离子同Ｃ６０分子之间互作用方式有关C 60 films were irradiatied at room temperature by medium energy(120 360keV) radiation of different ions (H +,He +,N +,Ar +), and the radiation effects were investigated using Raman spectra. The results showed that the radiation of medium energy ions could cause C 60 films polymerized and amorphous. However, occurrence of the phenomena depends on dosage, which is related to the interaction between the radiation ion and C 60 molecule. A possible explanation for th..

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies