Vincent Gillet

Collective properties of N = 50 isotopes

Abstract Vibrational properties in the N = 50 isotopes are calculated within the Tamm-Dancoff approximation and random phase approximation framework including neutron particle-hole excitations of the closed N = 50 shell and using a phenomenological treatment practically free of adjustable parameters. Core-coupling is essential for the octupole vibration, but this simple picture fails for the properties of even parity states.

EVIDENCE FOR QUARTET STRUCTURE IN MEDIUM AND HEAVY NUCLEI.

Abstract The second differences of the nuclear masses keeping T constant are discussed for even-even nuclei throughout the mass table. They are shown to be consistent with the quartet picture of weakly interacting tight two-proton two-neutron structures.

Relativistic Many-Body Bound Systems: Electromagnetic Properties

Report presenting the formulae for the calculation of the electron scattering form factors, and of the static magnetic dipole and electric quadrupole moments, of relativistic many-body bound systems. The framework, given in NBS Monograph 147, is relativistic quantum field theory in the Schrodinger picture ; the physical particles, i.e. the solutions of the interacting fields, are given as linear combinations of the solutions of the free fields, called the parton fields. The parton-photon interaction is taken as given by minimal coupling, p -> p - eA ; in addition the contribution of the photon-vector meson vertex of the vector dominance model is derived.