中能~8B和~9C与Si反应总截面的测量

Measurement of Total Reaction Cross Sections for^8B and ~9C on Silicon Target

能量为 75MeV/u的12 C初级束轰击 2mm厚的初级Be靶 ,并利用RIBLL从弹核碎片中分离出 54 2MeV/u质子滴线核束8B和 61 1MeV/u的9C ,再轰击Si靶 ,用透射法测量了它们与Si的反应总截面σR.并应用Glauber模型进行理论计算 。

Intermediate energy radioactive ion beams of 8B and 9C were produced with 75MeV/u 12C beam on 9Be target. Total reaction cross sections σ R for 8B and 9C on silicon target were measured by the transmission method at the second focus of RIBLL. If the two nuclei are treated as normal nuclei, the values of the total cross sectious calculated by Glauber Model are much lower than the experimental ones. Assuming additional tails for the nuclear density distribution of 8B and 9C, the calculated values reproduce the experimental data very well. The experimental results combined with Glauber theory analysis show that 8B and 9C may be of a halo structure.