Analytically solvable potentials for γ\gamma-unstable nuclei

An analytical solution of the collective Bohr equation with a Coulomb-like and a Kratzer-like $\gamma-$unstable potential in quadrupole deformation space is presented. Eigenvalues and eigenfunctions are given in closed form and transition rates are calculated for the two cases. The corresponding SO(2,1)$\times$SO(5) algebraic structure is discussed.Comment: 9 pages, 4 figures in one .ps fil

Many-body perturbation calculation of spherical nuclei with a separable monopole interaction: I. Finite nuclei

We present calculations of ground state properties of spherical, doubly closed-shell nuclei from $^{16}$O to $^{208}$Pb employing the techniques of many-body perturbation theory using a separable density dependent monopole interaction. The model gives results in Hartree-Fock order which are of similar quality to other effective density-dependent interactions. In addition, second and third order perturbation corrections to the binding energy are calculated and are found to contribute small, but non-negligible corrections beyond the mean-field result. The perturbation series converges quickly, suggesting that this method may be used to calculate fully correlated wavefunctions with only second or third order perturbation theory. We discuss the quality of the results and suggest possible methods of improvement.Comment: 20 Pages, 11 figure

Niels Bohr y la bomba atómica

The aim of this work is to temporarily correlate the scientific discoveries that allowed the construction of the atomic bomb, with the political events and technological implementations that took place at the relevant countries. The Danish physicist Niels Bohr -who had been the senior leader in the construction of quantum mechanics- was the first to realize that nuclear arms were qualitatively different from any other weapon used so far, and that the construction of a stable postwar peace required an opening on the nuclear subject between the allied countries, including the USSR. In spite of Bohr's high level contacts within the USA and Great Britain governments, Bohr's ideas took over gradually, only after his death