重核大集团发射半衰期的计算

Calculation of half-lives of heavy cluster emission for heavy nuclei

重核大集团(14C-34Si)发射的半衰期在理论上用Wentzel-Kramers-Brillouin近似进行了计算.利用双折叠模型计算大集团和剩余子核间的核相互作用,在折叠积分中选取了密度依赖的、零力程交换项的核子-核子相互作用.计算得到的半衰期和液滴模型结果、系统公式的结果以及实验数据进行了比较,表明目前的计算能够很好地给出重核大集团(14C-34Si)发射的寿命.这可为重核其他大集团(15N,46Ar,48Ca等)的发射提供可靠的预测.

Half-lives of heavy cluster（^14C-^34Si）emission for heavy nuclei are theoretically calculated in the frame of WKB approximation.The microscopic nuclear potential between heavy cluster and residual nuclei for parent nuclei is obtained by doublefolding process by using density-dependent nucleon-nucleon interaction with zero-range exchange term.The results are compared with those of liquid-drop model,systematic formula and experimental data.It is obvious that the present calculation can successfully give the lifetimes of heavy cluster（^14C-^34Si）emission for heavy nuclei.It also provides reasonable prediction for the other heavy cluster（^15N,^46Ar and ^48Ca,etc.）emission for some nuclei.