Angular momentum transfer in multinucleon transfer channels of O18+Np237
Angular momentum transfer in multinucleon transfer channels of O18+Np237
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O18 Np237 多核子转移通道中的角动量转移
DOI：
10.1103/physrevc.105.l021602
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发表时间：
2022
影响因子：
3.1
通讯作者：
Aritomo Y.
中科院分区：
文献类型：
--
作者：
Tanaka S.;Hirose K.;Nishio K.;Kean K. R.;Makii H.;Orlandi R.;Tsukada K.;Aritomo Y.
在多核子转移反应中产生的初级激发态化合物核的角动量是计算合成富中子重元素核的截面和替代反应研究的一个重要参数。然而，由于缺乏详细的实验数据，其机理还不够清楚。在本研究中，我们测定了在反应的多核子转移通道中产生的初级激发核的角动量。为了达到这个目的，测量了每个复合核的裂变碎片相对于垂直于反应平面的轴线的角分布。分布显示出各向异性，在反应平面上表现出增强的产率。鞍点模型很好地再现了它们，模型框架中的平均角动量是由鞍点模型得到的。角动量随着复合核质量的增加而增加，交换的核子数也随之增加，但呈现出向较重复合核饱和的趋势。这些结果首次指出了角动量与传输通道的依赖关系。
The angular momentum of a primary excited compound nucleus produced in multinucleon transfer reaction is an important quantity to evaluate cross sections to synthesize neutron-rich heavy-element nuclei as well as for surrogate reaction studies. The mechanism is, however, not enough understood due to the lack of detailed experimental data. In the present study, we determined the angular momentum of primary excited nuclei,, and, produced in the multinucleon transfer channels of thereaction. With this aim, angular distributions of fission fragments with respect to the axis perpendicular to the reaction plane were measured for each compound nucleus. The distributions show an anisotropy exhibiting an enhanced yield on the reaction plane. They are well reproduced by a saddle-point model, from which the average angular momentum is derived in the model framework. The angular momentum increases with the compound-nucleus mass, thus the number of nucleons exchanged, but shows a saturating trend toward heavier compound nuclei. These results are the first ones to point to the dependence of the angular momentum on the transfer channels.