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arXiv 1306.6241nucl-th
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具有集体态增强的扩展超流模型中的核能级密度

Nuclear Level Density within Extended Superfluid Model with Collective State Enhancement

Vladimir Plujko, Oleksandr Gorbachenko, Boris Bondar, Evgeniy Rovenskykh

摘要:

对于核能级密度,研究了一个具有不同集体态增强因子的改进的广义超流模型。考虑了集体态对温度形成的影响。利用中子共振间距和低能级累积数的理论值与实验值的卡方拟合,编制了能级密度参数$a$的渐近值和激发能的附加位移的现成表格。得到了这些参数随质量数和中子过剩量的变化规律。采用改进的广义超流核能级密度模型,用EMPIRE 3.1程序研究了集体态效应对中子诱发核反应的γ谱和激发函数的影响.

英文摘要:

For nuclear level densities, a modification of an enhanced generalized superfluid model with different collective state enhancement factors is studied. An effect of collective states on forming the temperature is taken into account. The ready-to-use tables for the asymptotic value of $a$-parameter of level density as well as for addition shift to excitation energy are prepared using the chi-square fit of the theoretical values of neutron resonance spacing and cumulative number of low-energy levels to experimental values. The systematics of these parameters as a function of mass number and neutron excess are obtained. The collective state effect on gamma-ray spectra and excitation functions of neutron-induced nuclear reactions is investigated by the use of EMPIRE 3.1 code with modified enhanced generalized superfluid model for nuclear level density.

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