共查询到20条相似文献,搜索用时 15 毫秒
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在能量高达72MeV的~(12)C轰击~(115)In(Z=49)的反应中,使用核化学技术测量了~8Be和α转移的余核碘(Z=53)和锑(Z=51)同位素的激发函数和角分布.用简单的运动学方法分析了余核角分布后指出,碘同位素来自三种不同的反应机制,即复合核蒸发α,强阻尼的非完全熔合以及不完全动量转移的裂开-熔合过程.在入射能量约70MeV时,后两个过程(或统称为~8Be转移)的截面为100多毫巴,显著大于根据锑同位素截面导出的大约17毫巴的α转移反应截面.实验结果和类似反应中测量出射α粒子得到的结论很好相符. 相似文献
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本文利用U(5)群代数对核分子12C+12C振转谱进行分类. 结果表明, 利用动力学对称性U(5) U(4) O(3)可以较好地描述12C+12C核分子振转能级的对称性质. 相似文献
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本文主要介绍了入射离子能量为64和67MeV时,12C+197Au反应中出射的α粒子的能谱和角分布,以及能量为71.5MeV时该反应中出射的α、Be和B等粒子的能谱和角分布。给出了6Li粒子的产额和使用α-α粒子符合技术,在相对于东流方向成90°处测得的反应中出射的8Be分裂开的α粒子的能谱和产额。反应中出射的各种粒子的最可几能量,随着入射离子能量的降低而降低,角分布都是大约在擦边角附近出现峰值,当入射离子能量从71.5MeV降到64MeV时,其峰位大约从80°移到120°,显示出转移反应的特征。我们对实验结果作了一些简要的分析讨论。 相似文献
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ZHAO You-Xiong GUO Zhong-Yan ZHU Yong-Tai ZHAN Wen-Long HU Xiao-Qing XI Hong-Fei LIU Guan-Hua ZHOU Jian-Qun FENG En-Pu YIN Shu-Zhi WEI Zhi-Yong Fan En-Jie MA Yu-Gang 《中国物理C(英文版)》1992,16(11):1022-1029
The energy spectra and angular distribution of α particles emitted from 12C induced reactions with 58Ni,115In and 197Au have been measured.Three moving sources of emitting α particle are clearly seen from invariant cross section distribution in velocity coordinates.The experimental data were analyzed by using three moving sources.Extracted parameters of the source with half-beam velocity are in agreement with the systematic values from Fermi Gas Model.The energy spectra and the extracted parameters for various targets are discussed.The low energy peak in energy spectra is possibly from the emitted α particle from equilibrium system after pre-equilibrium emission of target-like products.The energetic α particles are mainly from projectile fragmentation and projectile-like fragmentation. 相似文献
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Yin Shuzhi Zhu Yongtai Zhan Wenlong Guo Zhongyan Hu Xiaoqing Xi Hongfei Liu Guanhua Zhou Jianqun Fan Enjie Feng Enpu Wang Xiaoqiu 《中国物理C(英文版)》1994,18(8):673-679
Energy spectra of complex fragments emitted in the reactions of 46.7MeV/u 12C with different targets 197Au,115In and 58Ni have been measured by telescopes,consisting of a gis ionization counter followed by a position Sensitive semiconductor detector.Tha most probable kinematical energies.Ep of complex fragments and temperature parameters of long-live intermediate systems have been deduced by complex fragment ernergy spectra.The experimental values of Ep are lower than the calculated ones by E=Vcoul+2T.The experimental values of complex fragment yields can be reproduced by simple A.Friedman statistical evaporation model satisfactorily. 相似文献
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用α-γ符合测量方法, 对72MeV的12C离子轰击近球形靶124Sn的(12C,α×n)和(12C,8Be×n)反应进行了研究. 测定了与前方角20°—50°发射的α粒子相关联的余核级联γ的平均γ多重性γ>, 据此推算出124Sn核俘获8Be和α反应的最可几初始轨道角动量分别是35.5(h)和39(h), 与全熔合临界角动量lcr=34.4(h)之比近似等于1, 甚至稍大于1. 实验支持了大质量转移是发生在高角动量区的周边反应的观点, 而与近期出现的初始l布局有赖于靶核形变程度及球形靶核系统的大质量转移是中心碰撞的论点相背悖. 相似文献
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A formalism for studying the interference between the direct reaction and the compound resonance processes is presented by the S-matrix theory; The mechanism of 12C(d, d) 12C, 12C(d, p1) 13C* and 12C(d, p2) 13C* reactions in the energy range Ed=1.63 MeV to 2.05 MeV is analysed.Te results show that: the interference between these two processes exists; and the quantitative relation between them is given. While the parameters of direct reactions and compound resonance processes, particularly for four resonance states with Ed=1.726, 1.767, 1.792 and 1.86 MeV are determined. 相似文献
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本文利用部分熔合机制,给出了一种可能的解释,说明为什么在入射能量稍高于库仑位垒的12C+209Bi反应中8Be转移几率较大,α转移几率却几乎可以忽略。 相似文献