【摘要】：近年來,超重核合成的研究已經(jīng)成為核物理研究的重要領(lǐng)域之一。本文對超重核的生成截面進行了理論計算和研究,可分為以下三個部分。第一部分:首先,計算了若干反應(yīng)道的俘獲截面。其次,我們采用求解主方程而不對驅(qū)動勢做任何近似來描述彈靶核之間的核子轉(zhuǎn)移過程,計算了形成超重復合核的熔合幾率,結(jié)果顯示熔合幾率隨入射能量增加而增大。此外,采用統(tǒng)計模型計算了超重復合核的存活幾率。最后,給出了若干反應(yīng)道的蒸發(fā)剩余截面。第二部分:在雙核模型的框架內(nèi),研究了超重核生成截面分別對彈核同位素鏈與靶核同位素鏈的同位素依賴性。結(jié)果顯示超重核的生成截面對彈核同位素鏈與靶核同位素鏈都有強烈的同位素依賴性,且彈核越豐中子、生成截面越小,而靶核越豐中子、生成截面越大。造成超重核生成截面同位素依賴性的重要因素包含內(nèi)熔合位壘、裂變位壘、及中子分離能等。第三部分:在雙核模型的框架內(nèi),對大質(zhì)量轉(zhuǎn)移反應(yīng)進行了研究,計算了反應(yīng)體系~(238)U+248Cm與~(238)U+~(238)U的驅(qū)動勢。此外,我們計算了這兩個反應(yīng)體系的類靶核碎塊分別在角動量L=0與L=40時不同時刻的質(zhì)量產(chǎn)物分布。
[Abstract]:In recent years, the study of overweight nuclear synthesis has become one of the important fields of nuclear physics. In this paper, the generation cross section of superheavy nuclei is calculated and studied theoretically, which can be divided into the following three parts. The first part: firstly, the capture cross sections of several reaction channels are calculated. Secondly, we use the solution of the master equation without any approximation to the driving potential to describe the nucleon transfer process between the projectile and target nuclei, and calculate the fusion probability of the formation of overweight compound nuclei. The results show that the fusion probability increases with the increase of incident energy. In addition, the survival probability of the hyperrepetitive nucleus is calculated by using the statistical model. Finally, the evaporation residual cross sections of several reaction channels are given. The second part: in the framework of the binuclear model, the isotope dependence of the superheavy nucleus generation cross section on the isospin chain and the target isospin chain of the projectile nucleus is studied respectively. The results show that the formation cross section of the superheavy nucleus is strongly isotope dependent on the isospin chain of the projectile nucleus and the isospin chain of the target nucleus, and the more neutron-rich the projectile nucleus is, the smaller the cross-section of the formation is, while the larger the neutron-rich cross-section of the target nucleus is, the greater the formation cross-section is. The important factors contributing to isotope dependence of superheavy nuclei include internal fusion barrier fission barrier neutron separation energy and so on. Part three: in the framework of the binuclear model, the mass transfer reaction is studied, and the driving potentials of the reaction system ~ (238) U-248Cm and ~ (238) U ~ (238) U are calculated. In addition, we have calculated the mass product distributions of the target-like nuclear fragments of these two reaction systems at different times when the angular momentum is L _ (0) and L ~ (40), respectively.
【學位授予單位】：深圳大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O571

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本文編號：2446168