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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Nuclear density ： ウィキペディア英語版 Nuclear density Nuclear density is the density of the nucleus of an atom, averaging about 2.3×1017 kg/m3. The descriptive term ''nuclear density'' is also applied to situations where similarly high densities occur, such as within neutron stars. The nuclear density for a typical nucleus can be approximately calculated from the size of the nucleus, which itself can be approximated based on the number of protons and neutrons in it. The radius of a typical nucleus, in terms of number of nucleons, is $R=A^R\_0$ where $A$ is the mass number and $R\_0$ is 1.25 fm, with deviations of 0.2 fm from this value. The density of the nucleus is thus: :$n\; =\; \backslash frac\; \backslash pi\; R^3\}$ The mass density is the product of ''n'' by the nuclear mass. For a single nucleon, A=1, therefore :$n\; =\; =\; 0.122\; \backslash \; \backslash mathrm^\; =\; 1.22\; \backslash cdot\; 10^\; \backslash \; \backslash mathrm^$ The experimentally determined value for ''n'' is 0.16 fm−3. The calculated mass density, using a nucleon mass of 1.67×10−27 kg, is thus: :$(1.67\; \backslash cdot\; 10^\; \backslash \; \backslash mathrm)\; (1.22\; \backslash cdot\; 10^\; \backslash \; \backslash mathrm^)\; =\; 2.04\; \backslash cdot\; 10^\; \backslash \; \backslash mathrm\; \backslash cdot\; \backslash mathrm^$ == Applications and extensions == The components of an atom and of a nucleus have varying densities. The proton is not a fundamental particle, being composed of quark-gluon matter. Its size is approximately 10−15 meters and its density 1018 kg/m3. The descriptive term ''nuclear density'' is also applied to situations where similarly high densities occur, such as within neutron stars. Using deep inelastic scattering, it has been estimated that the "size" of an electron, if it is not a point particle, must be less than 10−17 meters. This would correspond to a density of roughly 1021 kg/m3. Probing deeper within particles, one finds quarks which appear to be very dense and very hard. There are possibilities for still higher densities when it comes to quark matter, gluon matter, or neutrino matter. In the immediate future, the highest experimentally measurable densities will likely be limited to leptons and quarks. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nuclear density」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.