Sylvian Kahane

Rayleigh and Delbruck scattering of 6.8–11.4 MeV photons at θ = 1.5°

Abstract An absolute measurement of the elastic scattering cross section of mono-energetic photons on Pb and U targets in the range 6.8–11.4 MeV at θ = 1.5° was carried out. Strong evidence for the real Delbruck amplitude and for Rayleigh scattering contributions from K-, L-, and higher-shell electrons is obtained.

Nuclear Thomson scattering of 5.5–7.2 MeV photons

Abstract The elastic differential scattering cross section from carbon and magnesium targets was measured at θ = 140° using monoenergetic photons in the range 5.5–7.2 MeV. The contribution of nuclear Thomson scattering is shown to be dominant. The results are in good agreement with predicted values.

Calculation of B(E2){down_arrow}, spectroscopic quadrupole moments Q(J), and magnetic dipole moments {mu}(J) for the yrast states in {sup 196}Pt by a projection formalism

The three major electromagnetic transition quantities, B(E2){down_arrow},Q(J), and {mu}(J), are calculated for the yrast band of {sup 196}Pt by a projection formalism. The valence nucleon space is divided into four sectors of normal and abnormal parity states for neutrons and protons separately. The collective properties are evaluated in each of the four sectors and summed. A comparison is made with the IBM and SO(6) results, and it is shown that the projection calculations are performing equally well using only one fitted parameter and one normalization.

Elastic and Raman scattering of 9.0 and 11.4 MeV photons from Au, Dy, and In

Monoenergetic photons between 8.8 and 11.4 MeV were scattered elastically and in elastically (Raman) from natural targets of Au, Dy and In.15 new cross sections were measured. Evidence is presented for a slight deformation in the 197Au nucleus, generally believed to be spherical. It is predicted, on the basis of these measurements, that the Giant Dipole Resonance of Dy is very similar to that of 160Gd. A narrow isolated resonance at 9.0 MeV is observed in In.

Rayleigh Scattering of N-Capture γ Rays

Nine γ-lines in the energy range 0.4–3 MeV, produced by the Ni(n,γ) reaction, were scattered from targets of C, Cu, Ta, In and U, at θ=1.02°. Differential cross sections were measured relative to C. Rayleigh (R) scattering dominates the scattering cross section and the results were found to agree fairly good with calculations using the form-factor approximation.