Bare nucleus model

The results concerning the allowance for the / -source molecular structure (Kaplan et al., 1982,1983) were used in reduction of the new experimental data obtained by the ITEP group. Table I (Boris et al., 1983) shows the most probable values of the neutrino rest mass obtained by data reduction using the models of a bare nucleus, of a tritium atom, and of a real valine molecule. The reduction of the new experimental data within the bare-nucleus model did not lead to a nonzero rest mass of the neutrino. The allowance for the electron structure of valine gives mvc2 = 33 eV.2 Thus, the quantum chemical calculations proved to be a necessary step in the reduction of the data concerning the properties of an elementary particle. 

The order of perturbation at which various levels of excitation first arise is illustrated in Figure 11 for three different reference functions. In Figure 11(a), the Hartree-Fock orbitals are used to form the reference function, in Figure 11(b) the bare-nucleus model is used in zero-order, while in Figure 11(c) Brueckner orbitals are used to construct the reference function. 

The simplest independent-electron model results from a complete neglect of electron-electron interactions. This is the bare-nucleus model for which the Hamiltonian h is merely a sum of kinetic energy and nucleus-electron attraction terms. The bare-nucleus model has a number of unique features which make its use in atomic and molecular studies attractive (see, for example. Refs. 7 and 17-22). The most widely used independent-electron model is the Hartree-Fock model. In this model, as is well known, the... 

Case 1. The absence of excitations in the f3 source (the model of a bare nucleus) the 99% confidence interval for the neutrino mass was found to be... 

Finally, the most massive entity normally emitted as radiation is the alpha (a) particle which consists of a bare (no electrons), small nucleus having two protons and two neutrons. The nucleons making up an alpha particle are very strongly bound together, and unlike electrons, the alpha particle appears to exist in the parent nucleus as a cohesive unit prior to the decay in our simple model. This process is somewhat more rare than P ory decay. 

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