Golovchenko A N, Skvarc J, Ilic R, Sihver L, Bamblevski V P, Tretyakova S P, Schardt D, Tripathi R K, Wilson J W, Bimbot R
Flerov Lab. of Nuclear Reactions, Joint Institute for Nuclear Research, Dubna, Russian Federation.
Nucl Instrum Methods Phys Res B. 1999;159(4):233-40. doi: 10.1016/s0168-583x(99)00546-7.
Stacks consisting of thin CR-39 sheets sandwiched between thick lucite and water absorbers were perpendicularly bombarded by 12C ions at 200 and 244 MeV/u. Track radius distributions representing the charge composition of the fragmented beams were automatically measured by a particle track analysis system. After analysis of the nuclear charge distributions, the total charge removal cross-sections and elemental production cross-sections of fragments with atomic numbers from 5 to 3, were obtained down to the lower energies (approximately 50 and 100 MeV/u, respectively). It has been found that the measured total charge removal cross-section agrees with theoretical predictions within approximately 10% and very well with previous experiments in corresponding energy regions. Two model calculations for production of B fragment are in good agreement with our measured data while a third model overestimates it by approximately 12%. Theoretical cross-sections for Be and Li fragments differ strongly among the different models and from measured values.
由夹在厚有机玻璃和吸水剂之间的薄CR - 39片组成的叠层，被能量为200和244 MeV/u的12C离子垂直轰击。通过粒子径迹分析系统自动测量代表破碎束流电荷组成的径迹半径分布。在分析核电荷分布后，获得了原子序数从5到3的碎片的总电荷去除截面和元素产生截面，能量低至约50和100 MeV/u（分别）。已经发现，测量的总电荷去除截面与理论预测在约10%的范围内相符，并且与相应能量区域的先前实验非常吻合。两种用于产生B碎片的模型计算与我们测量的数据吻合良好，而第三种模型将其高估了约12%。不同模型中Be和Li碎片的理论截面差异很大，且与测量值不同。
