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词汇 Liquid drop model
分类 英语词汇 英语翻译词典
释义

Liquid drop model

中文百科

液滴模型 Semi-empirical mass formula

（重定向自Liquid drop model）
A graphical representation of the semi-empirical binding energy formula. The binding energy per nucleon in MeV (highest numbers in dark red, in excess of 8.5 MeV per nucleon) is plotted for various nuclides as a function of Z, the atomic number (on the y-axis), vs. N, the neutron number (on the x-axis). The highest binding energies are seen for Z = 26 (iron).

液滴模型是一个关于原子核的模型。

魏茨泽克公式将原子核的束缚能，表示成数个项之和。式中有部分常项由实验确定，变量则由理论推导出。

一个原子核的束缚能可表示为：

B(A, Z) = a_{vol} A - a_{surf} A^{2/3} - a_{comb} Z(Z-1) A^{-1/3} - a_{sym} (A-2Z)^2 A^{-1} + (((-1)^Z + (-1)^{A-Z})/2) a_{P} A^{-1/2}

其中A为质量数（核子数目，质子及中子数目之和），Z为原子序数（质子数目）。

另外，B = ( (A-Z) m_n + Z m_p - m)c^2 ，m_n是一颗中子质量，m_p是一颗质子质量，m是原子核质量。

英语百科

Semi-empirical mass formula 液滴模型

（重定向自Liquid drop model）
A graphical representation of the semi-empirical binding energy formula. The binding energy per nucleon in MeV (highest numbers in dark red, in excess of 8.5 MeV per nucleon) is plotted for various nuclides as a function of Z, the atomic number (on the y-axis), vs. N, the neutron number (on the x-axis). The highest binding energies are seen for Z = 26 (iron).

In nuclear physics, the semi-empirical mass formula (SEMF) (sometimes also called Weizsäcker's formula, or the Bethe–Weizsäcker formula, or the Bethe–Weizsäcker mass formula to distinguish it from the Bethe–Weizsäcker process) is used to approximate the mass and various other properties of an atomic nucleus from its number of protons and neutrons. As the name suggests, it is based partly on theory and partly on empirical measurements. The theory is based on the liquid drop model proposed by George ****w, which can account for most of the terms in the formula and gives rough estimates for the values of the coefficients. It was first formulated in 1935 by German physicist Carl Friedrich von Weizsäcker, and although refinements have been made to the coefficients over the years, the structure of the formula remains the same today.
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