Study of fission using multi-nucleon transfer reactions

Study of fission using multi-nucleon transfer reactions
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利用多核转移反应研究裂变

DOI:
10.1051/epjconf/201816900013
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发表时间:
2018
影响因子:
--
通讯作者:
A. Andreyev
A. Andreyev
中科院分区:
--
文献类型:
--
作者:
K. Nishio;K. Hirose;M. Vermeulen;H. Makii;R. Orlandi;K. Tsukada;M. Asai;A. Toyoshima;T.K. Sato;Y. Nagame;S. Chiba;Y. Aritomo;S. Tanaka; T. Ohtsuki;I. Tsekhanovich;C.M. Petrache;A. Andreyev

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结果表明,多核子转移反应是研究奇异的富含中子元素的吖系元素核裂变的有力工具,这是粒子俘获或重离子聚变反应所不能达到的。本文利用18O+232Th、18O+238U、18O+248Cm和18O+237Np反应的多核子转移通道测量了各转移通道的裂变碎片质量分布。在所研究的所有情况下,在低激发能下都观察到了主要的不对称裂变,随着对称裂变向高激发能的增加。实验数据与涨落耗散模型的预测进行了比较,在该模型中引入了多几率裂变(裂变前的中子蒸发)的影响。结果表明,保持在高激发能下的质量不对称结构来源于低激发态和较低丰度的激发核,这是由于高阶几率裂变所致。
It is shown that multi-nucleon transfer reaction is a powerful tool to study fission of exotic neutronrich actinide nuclei, which cannot be accessed by particle-capture or heavy-ion fusion reactions. In this work, multi-nucleon transfer channels of the reactions of18O+232Th,18O+238U,18O+248Cm, and18O+237Np were used to measure fission-fragment mass distribution for each transfer channel. Predominantly asymmetric fission is observed at low excitation energies for all the studied cases, with an increase of the symmetric fission towards high excitation energies. Experimental data are compared with predictions of the fluctuation-dissipation model, where effects of multi-chance fission (neutron evaporation prior to fission) was introduced. It is shown that mass-asymmetric structure remaining at high excitation energies originates from low-excited and less neutronrich excited nuclei due to higher-order chance fissions.
逆运动学中 238U 12C 反应的转移和聚变诱发裂变的同位素产率分布
DOI: --
发表时间: 2013
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