On the Structure of Heavy Nuclei

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概要

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• We make the following assumptions on the structure of heavy nuclei whose atomic weights A are greater than 110. The nuclear matter is nearly incompressible and their constituent neutrons have a tendency to cluster into closed shells, which are of a spherical shape and arranged concentrically in the spherical nucleus. Inner shells are bound more tightly than the outer ones. The proton density is determined only by the proper nuclear force and the Coulomb repulsion, and is given by the formula ρ(r) = const. {1+1/6・(〓/7.3〓_0)^2_〓. A shell mixed with the protons is called a core. A core is destroyed if at least one of its constituent neutrons or protons is knocked out. The part thus destroyed is assumed to make a liquid-like behavior in the fissioning of heaviest nuclei, and the thermodynamical treatment is applied to this part only. Under these assumptions, (i) we obtain r_0=1.32・10^<-13>cm when A≳200, (ii) the shape of the fission yield curves of heaviest nuclei is explained, (iii) the released energy in the fission of U^<238> is about 195 Mev, (iv) the energy level spacing of heavy nuclei is greater than that obtained from the uniform liquid-drop model, and (v) the cross section of the neutron inelastic scattering by heavy nuclei is smaller, and the velocity of the scattered neutron is larger than those so far obtained. The introduction of the core explains the irregularity of the intensity of the fluorescent gamma-ray emitted from nuclei, and makes the specific heat of heavy nuclei smaller than that so far theoretically obtained.

• 理論物理学刊行会の論文

著者

• Miyatake Osamu

  Institute Of Polytechnics Osaka City University

• MIYATAKE Osamu

  Institute of Polytechnics, Osaka City University

関連論文

• On the Structure of Heavy Nuclei

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