摘要
本文报道了46.7 MeV/u ^(12)C轰击^(58)Ni、^(115)In、^(197)Au反应发射α粒子的角分布和能谱。从速度表象中洛仑兹不变截面等高图中明显看到发射α粒子的三个源。用这三个源的运动源模型成功地拟合了α粒子能谱,所提取的强相互作用源参数符合费米气体模型计算结果,并讨论了能谱及拟合参数对靶的依赖关系。认为快速源实质上来自弹核碎裂或类弹核碎裂。
The energy spectra and angular distribution of α particles emitted from ^(12)C induced reactions with ^(58)Ni, ^(115)In and ^(197)Au 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 main ly from projectile fragmentation and projectile-like fragmentation.
出处
《高能物理与核物理》
CSCD
北大核心
1992年第11期1022-1029,共8页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金
