Evolution from dinucleus to mononucleus and its implication in the synthesis of superheavy nuclei
Evolution from dinucleus to mononucleus and its implication in the synthesis of superheavy nuclei
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从双核到单核的演化及其在超重核合成中的意义
DOI：
10.1140/epja/i2012-12133-3
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发表时间：
2012-10
影响因子：
2.7
通讯作者：
Wen-Zhong Wang
中科院分区：
文献类型：
--
作者：
u-Jie Liang;Min Zhu;Zu-Hua Liu;Wen-Zhong Wang
利用二维集体空间中的耦合 Langevin 方程研究了不对称系统 58Fe +244Pu 在 Ec.m.= 260 MeV 时颈部的演化，并将结果与冻结假设下的一维方法获得的结果进行了比较。研究发现，径向自由度和颈部自由度之间的耦合降低了颈部生长的漂移速度，并延迟了从双核到单核的转变。此外，当注入不对称裂变谷时，耦合使系统形成某种拉长的形状，因此聚变概率和相关的蒸发残渣（ER）横截面降低。对于系统 58Fe +244Pu ，与在冻结近似下获得的那些相比，ER 横截面减少了约 30%。因此，我们可以得出这样的结论：对于58Fe+244Pu这样的重不对称体系，不同自由度之间的耦合对双核到单核的演化具有重要影响，并且就颈部动力学而言基本上不满足冻结近似。然而，与对称反应相比，不对称反应中颈部动力学对重系统聚变阻碍因素的影响要弱得多。
The evolution of neck for the asymmetric system58Fe +244Pu atEc.m.= 260 MeV has been studied with the coupled Langevin equations in two-dimensional collective space and the results compared to those obtained with a one-dimensional approach under the frozen assumption. It is found that the coupling between the radial and neck degrees of freedom reduces the drift velocity of neck growth and delays the transition from dinucleus to mononucleus. Besides, the coupling brings the system into a somehow elongated shape when the injection into the asymmetric fission valley takes place, hence, the fusion probability and the relevant evaporation residue (ER) cross-sections decrease. For the system58Fe +244Pu , the ER cross-sections decrease by about 30% as compared to those obtained under the frozen approximation. Therefore, we may arrive at the conclusion that for the heavy asymmetric systems such as58Fe +244Pu the coupling between different degrees of freedom has important effects on the evolution from dinucleus to mononucleus and the frozen approximation is basically not satisfied as far as the neck dynamics is concerned. However, as compared to the symmetric reactions, the influence of the neck dynamics on the fusion hindrance factor of heavy systems is much weaker for the asymmetric reactions.
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DOI：
10.1016/b978-0-12-710850-6.50017-4
发表时间：
1973
期刊：
--
影响因子：
--
作者：
R. Vandenbosch
通讯作者：
R. Vandenbosch
影响因子：
8.6
作者：
R. Bass
通讯作者：
R. Bass
影响因子：
3
作者：
J. Randrup;W. Swiatecki
通讯作者：
J. Randrup;W. Swiatecki
影响因子：
3.1
作者：
A. Dhara;K. Krishan;C. Bhattacharya;Sailjananda Bhattacharya
通讯作者：
A. Dhara;K. Krishan;C. Bhattacharya;Sailjananda Bhattacharya
DOI：
10.1103/physrevc.33.2039
发表时间：
1986-06
期刊：
Physical review. C, Nuclear physics
影响因子：
--
作者：
A. Sierk
通讯作者：
A. Sierk