论文标题
了解裂变碎片质量分布，以随机颈部破裂模型的改良形状
Understanding fission fragment mass distributions in a modified shape of random neck rupture model
论文作者
论文摘要
在Brosa et提出的随机颈部破裂模型（RNRM）的框架工作中，已经研究了在化合物核的较广泛裂变范围内的裂变质量分布的方差。 al。，。 RNRM模型中使用CREL = 1产生裂变核的形状，从而导致裂变核的平滑而连续的形状。 RNRM模型的这种修改形状已用于分析27个系统的对称质量分布的质量方差的实验数据，从而了解较大效率0.7-0.95的Scission Shape Dynamics的对称质量分布。颈部半径是RNRM模型的重要参数，这已变化以适合实验质量方差数据。通过表面能量系数γO研究了所得颈部半径的系统学作为功能裂变和核电位。进一步研究了裂变片段的总体动力学<tke>作为裂变和γO参数的函数。据观察，适合实验观察到的质量分布方差的颈部半径落入两组，这些组与两组实验观察到的<tke> s有关。对于这两组裂变系统，已经为颈部半径获得了经验公式。使用经验公式用于颈部半径，可以很好地预测这些系统的质量差异，并且表明这些经验颈部半径比从瑞利标准开始的估计更好。16页，7个数字
The variances of the fission fragment mass distributions for symmetric fission over a wide range of the fissility of the compound nucleus have been investigated within the frame work of Random Neck Rupture Model (RNRM) proposed by Brosa et. al.,. The shape of the fissioning nucleus is generated using crel=1 in the RNRM model, which results in a smooth and continuous shape of fissioning nucleus. This modified shape of RNRM model has been used to analyse experimental data of mass variances for symmetric mass distributions of 27 systems leading to understanding of scission shape dynamics in a wide region of fissility 0.7-0.95. The neck radius is an important parameter of the RNRM model and this has been varied to fit the experimental mass variances data. The systematics of resulting neck radii are studied of as a function fissility and nuclear potential through γo, the surface energy coefficient. Further average total kinetic energies of fission fragments <TKE> are studied of as a function of fissility and γo parameter. It is observed that the neck radii that fit the experimentally observed variances of the mass distributions fall into two groups and these groups are related to two groups of experimentally observed <TKE>s. Empirical formulae have been obtained for the neck radii for these two groups of fissioning systems. Use of the empirical formulae for neck radii predict the mass variances reasonably well for these systems and it is shown that these empirical neck radii are better estimates than starting with the Rayleigh criterion.16pages,7 figures
