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[en] An ensemble of mass tables is generated by extrapolating with the transverse Garvey-Kelson equation from different subsets of experimentally known masses. Predictions of unknown masses are obtained by averaging over the ensemble. The averaging procedure also yields the uncertainties accompanying these predictions. No parameters are used. Results for some 4400 masses in the range 12 less than or equal to A less than or equal to 254, 5 less than or equal to Z less than or equal to 100, Z less than N less than or equal to 155, and Z = N for even-Z are presented in the main table in this issue. The average absolute deviation between experimentally known masses and their predictions is 102 keV
[en] It is noted that the staggering parameters used to describe even-odd effects for isotope shifts can in some cases exhibit very rapidly varying behavior as a function of neutron number. On the other hand, a three-parameter formula (3P) with fixed coefficients can explain the same behavior in the A=40 region.
[en] In the square chart of nucleus with S-H, all kinds of nuclei showed the systematic regularities. Now it is given the facts that distribution of nuclei with odd-A show coordinate ΔH=7,6,6,5,5,4,4,3,3 respectively
[en] A model of nuclear rotation is considered in which the condition bounding the space of trial states is quadratic in angular momentum. It is shown that, in the case of an even nucleus, the model gives the correct moment of inertia. For odd nuclei and for relatively low angular momenta, an approximate form of this model is obtained. The model is compared with the standard cranking model and the particle-plus-rotor model. 10 refs
[en] An algebraic shell-model realization of a quantum rotor for integral and half-integral angular momenta is introduced. The underlying symmetry of the theory is the SU(3) contains SO(3) group structure. The algebraic model reproduces the eigenvalues of the quantum rotor hamiltonian well for normal shell-model configurations; the mapping is exact for small values of the angular momentum in large SU(3) representations. A shell-model hamiltonian using this algebraic realization of the quantum rotor and other non-central one-body interactions is used to reproduce the experimental spectra of representative even and odd-mass ds-shell nuclei