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SU Jun LI Zhi-hong LIAN Gang WANG You-bao GUO Bing ZENG Sheng YAN Sheng-quan WANG Bao-xiang BAI Xi-xiang LIU Wei-ping 《中国原子能科学研究院年报》2005,(1):96-98
理论上存在着两种矛盾的预言,即通过碰撞核相对运动与破裂道的耦合使全熔合截面压低或增强。最近,Hagino作了一改进的耦合道模型计算,试图调和两种相冲突的处理。他的理论处理预言结果,在库仑位垒以下能区破裂使全熔合截面增强,而在垒上能区,破裂使全熔合截面压低。不同的理论预言,需要精确可靠的实验作判断。 相似文献
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ZENG Sheng LI Zhi-hong LIAN Gang WANG You-bao SU Jun YAN Sheng-quan WANG Bao-xiang GUO Bing BAI Xi-xiang LIU Wei-ping 《中国原子能科学研究院年报》2006,(1):110-111
Explosive hydrogen burning occurs in very massive (M≥ 10^5-10^8M) star with high temperature and density. Hot pp chain, hot CNO, hot NeNa-MgAl chain and the flowing rp ap process will play a prominent role in hydrogen burning as the temperature goes higher. When the temperature of the star is higher than 10^8 K, high temperature CNO chain is dominant in hydrogen burning, 相似文献
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金孙均 王友宝 苏俊 颜胜权 李云居 郭冰 李志宏 曾晟 连钢 白希祥 柳卫平 山口英齐 久保野茂 胡钧 D.Kahl 郑孝顺 文俊永 寺西高 王宏伟 石山博信 岩佐直人 小松原哲郎 李二涛 张健 《原子能科学技术》2014,48(12):2182-2186
在日本东京大学核研究中心的放射性离子束分离器上,利用逆运动学反应1H(22Ne,22Na)n产生了22Na次级束。经分离器电磁系统的分离提纯后,获得了能量为(78.3±1.0) MeV的22Na次级束。实验靶站处次级束的强度达2.5×105 s-1,其中22Na的纯度好于90%。22Na次级束已应用于与核天体物理Ne丰度异常问题相关的22Na+α共振散射实验研究。 相似文献
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《中国原子能科学研究院年报(英文版)》2000,(1)
8Liisatypicalneutron-skinnucleuswithahalf-lifeof838msandaneutronseparatioenergyof2.033MeV.Usinga8Libeam,onecanstudythereactionsrelevanttonuclearhalostructure,aswellastheimportantprimordialastrophysicsreactionssuchasd(8Li,9Li)p.Tomakethosemeasurementsfeasi… 相似文献
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P. Englert S. Theis R. Michel C. Tuniz R.K. Moniot S. Vajda T.H. Kruse D.K. Pal G.F. Herzog 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》1984,5(2):415-419
A model of a small meteorite, 10 cm in diameter, made of granodiorite was rotated in a beam of 600 MeV protons to simulate 4π-irradiation conditions in space. Analysis of Al foils placed at known locations within the model give depth profiles of high energy (7Be, 10Be) and low energy (24Na, 22Na) spallation products. These isotopes were measured by means of high-resolution gamma-ray or accelerator mass spectroscopy (AMS). While the production rate profiles of the high energy products are flat within the limits of uncertainty, the profiles of the low energy products increase from the surface to the center by a factor of approximately 1.2. This increase indicates the importance of secondary neutrons and protons for the production of low energy spallation products, even within small meteorites. 相似文献
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LUO Zhi-fu YIN Wei ZHANG Bao-qi LIU Yu-ping DENG Xue-song LIU She-yang LIANG Cheng-hu LIU Geng-shou ZHAO Gui-zhi 《中国原子能科学研究院年报》2006,(1):182-182
Same as the main preparation method for high purity of ^123I in other countries, we would use also 99.9% of ^124Xe gas via ^124Xe(p, x) reaction and ^123Xe decay to get the objective product ^123I. 相似文献
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《中国原子能科学研究院年报(英文版)》2000,(1)
The11C(p,γ)12Nreactionisoneofthekeyprocessesinhotppchains.Thisreactionmayberesponsiblefortheproductionof12Cincertainastrophysicalscenarios.Thereactionrateresultsfromthecontributionsofthe1.19MeVresonanceandthedirectcaputureintheGamowenergywindowcorrespond… 相似文献
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Gamma spectrometers with 100 × 100 mm NaI(Tl) and 200 × 100 mm CsI(Tl) crystals for detecting annihilation radiation of + radionuclides are described. Two spectrometers are located in a surface laboratory and one underground, at a depth of 500 m of water equivalent, in Novorossiisk. The background characteristics and the detection efficiency are presented for different operating modes of the coincidence system and for samples with different mass. A coincidence scheme in which all events with coincidences of pulses in both crystals and energy released in each detector are detected, making it possible to raise the 22Na detection efficiency by approximately 30%, was tested. The results of measurements of the 22Na content in some natural waters in Krasnodar krai, including in mud volcanoes, are presented. They show large seasonal variations. 相似文献
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