Colinear ternary fission and nucleon phase model
英文摘要:
The colinear ternary fission mode discovered by Pyatkov et al. can be interpreted in the framework of the nucleon-phase model of fission.
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G. Mouze, S. Hachem, C. Ythier
The colinear ternary fission mode discovered by Pyatkov et al. can be interpreted in the framework of the nucleon-phase model of fission.
机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。
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Ternary fission yields in the reaction 241Pu(nth,f) are calculated using a new model which assumes a nucleation-time moderated chemical equilibrium in the low density matter which constitutes the neck region of the scissioning system. The temperature, density, proton fraction and fission time required to fit the experimental data are derived and discussed. A reasonably good fit to the experimental data is obtained. This model provides a natural explanation for the observed yields of heavier isotopes relative to those of the lighter isotopes, the observation of low proton yields relative to 2H …
Ternary fission with the emission of long-range $α$ particles in fission of the heaviest nuclei
本文整理LRA三分裂实验数据,并基于裂变核α衰变性质提出半经验表达式,结合多种经验方法预测缺中子重核与超重核的LRA发射概率最高可达百分之一。
The ternary cluster decay of heavy nuclei has been observed in several experiments with binary coincidences between two fragments using detector telescopes (the FOBOS-detectors, JINR, Dubna) placed on the opposite sides from the source of fissioning nuclei. The binary coincidences at a relative angle of 180$^0$ deg. correspond to binary fission or to the decay into three cluster fragments by registration of two nuclei with different masses (e.g.$^{132}$Sn,$^{52-48}$Ca,$^{68-72}$Ni). This marks a new step in the physics of fission-phenomena of heavy nuclei. These experimental results for the co…
Within the Unified ternary fission model (UTFM), the alpha accompanied ternary fission of even-even $^{244-260}$Cf isotopes has been studied by taking the interacting barrier as the sum of Coulomb and proximity potential. For the alpha accompanied ternary fission of 244^Cf isotope, the highest yield is obtained for the fragment combination 108^Ru+4^He+132^Te, which contain near doubly magic nuclei 132^Te (N=80, Z=52). In the case of 246^Cf and 248^Cf isotopes, the highest yield is obtained for the fragment combinations with near doubly magic nuclei 134^Te (N=82, Z=52) as the heavier fragment. …
Bremsstrahlung emission accompanying ternary fission of \isotope[252]{Cf}
本研究建立了考虑几何与动力学特性的重核三元裂变轫致辐射量子模型,针对\isotope[252]{Cf}的计算与初步实验吻合,证实轫致辐射谱对裂变过程参数高灵敏度,为后续实验研究提供理论工具。
Experiments in preparation for search for uranium ternary fission by means of nuclear track emulsion are summarized. The study will be focused on the possible involvement of the unstable nucleus ${}^{8}$Be in the suggested scenario of the collinear tri-partition in the fission.
Fission decay of N = Z nuclei at high angular momentum: $^{60}$Zn
用一种独特的双臂重离子探测器系统(BRS,二元反应谱仪)测量了在$E_{lab}(^{36}$ Ar = 195 MeV激发能下,$^{60}$ Zn化合物核与$^{36}$ Ar束在$^{24}$ Mg靶上反应产生的符合裂变事件。探测器由两个大面积的位置敏感(x,y)气体望远镜与布拉格-电离室。从在两个探测器的二进制符合包括和排他性截面的裂变通道具有不同的损失的电荷。窄出平面的相关性对应于共面衰变观察到的两个片段中发射的二进制事件,并在数据中的三进制衰变与丢失的电荷从4到8。在减去宽分量后,这些窄的相关性被解释为在高角动量下通过细长形状的三元裂变过程。颈部区域的较轻质量主要由两个或三个粒子组成。给出了二、三裂变不同质量分裂的微分截面。用基于扩展的Hauser-Feshbach复合核衰变形式的统计模型解释了二元和三元事件的相对产额。三元裂变过程可用角动量在45-52 $hbar$附近的超形变态的衰变来描述。
Ternary cluster decay within the liquid drop model
在考虑核邻近能的旋转液滴模型中,测定了$^{36}$ Ar、$^{56}$ Ni和$^{252}$ Cf核的纵向三元和二元裂变势垒.对于轻核,由于最大值位于外部位置,并且具有高得多的转动惯量,因此在高角动量时,三元裂变势垒的高度与二元裂变势垒的高度具有竞争性。
A recent analysis of experimental ternary fission fragment yields using a nucleation moderated statistical equilibrium model reproduced observed yields with fairly good accuracy. In the present work, the same approach is applied to neck emission in peripheral and mid-peripheral 124Sn+112,124Sn collisions at 26A MeV. The model can reasonably reproduce the yields of lithium to silicon isotopes with realistic time and temperature values. A comparison is made between equilibrium constants derived from the present data and those previously obtained for ternary fission of 242Pu.
In the exothermic process of fission decay, an atomic nucleus splits into two or more independent fragments. Several aspects of nuclear fission are not properly understood, in particular the formation of the neck between the nascent fragments, and the subsequent mechanism of scission into two or more independent fragments. Using an implementation of time-dependent density functional theory, based on a relativistic energy density functional and including pairing correlations, we analyze the final phase of the process of induced fission of $^{240}$Pu, and show that the time-scale of neck formati…
Yields of equatorially emitted light isotopes, $1\le Z\le 14$, observed in ternary fission in the reaction $^{241}$Pu($n_{\rm th}$,f) are employed to determine apparent chemical equilibrium constants for low-temperature and low-density nuclear matter. The degree of liberation and role of medium modifications are probed through a comparison of experimentally derived reaction quotients with equilibrium constants calculated using a relativistic mean-field model employing a universal medium modification correction for the attractive $σ$ meson coupling. The results of these comparisons indicate tha…
In our previous publications we discussed various manifestations of a new decay channel of the low excited heavy nuclei called collinear cluster tri-partition (CCT). The most populated CCT mode was revealed in the mass correlation distribution of fission fragments (FFs) as a local region ("bump") of increased yields below the loci linked to the conventional binary fission. The bump was dubbed "Ni-bump" because it is centered at the masses associated with the magic isotopes of Ni. Intriguing features of the CCT, especially high collinearity of the CCT partners and relatively high probability co…
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