Basis Of Sum Rules Research Articles

Magnetic circular dichroism in photoelectron angular distributions from Gd(0001)

Abstract We report on the influence of photoelectron diffraction effects on magnetic circular dichroism in angular distribution as measured using core-level photoelectron spectroscopy. As an example system we study the effect by measuring azimuthal angle scans of the 4d core-level on a thick Gd(0001) film grown on W(110). In particular, for photoelectron emission in off-normal directions we observe deviations from the pure atomic picture which can be interpreted in terms of a multiple scattering theory. We also evaluate different measuring methods to see their influence on the angular behavior. Using high resolution data we can even study the state-specific contributions to the magnetic dichroism signal. The knowledge of these effects should help in interpreting absolute dichroism values on the basis of sum rules.

Sr87(d,p)Sr88reaction

Neutron particle-hole states in $^{88}\mathrm{Sr}$ have been studied by means of the reaction $^{87}\mathrm{Sr}(d,p)^{88}\mathrm{Sr}$ at ${E}_{d}=12$ MeV. It has been determined that the earlier reported transitions to presumed states at 4744 and 5780 keV in $^{88}\mathrm{Sr}$ arise mainly from transition to the ground state and the first excited state in $^{89}\mathrm{Sr}$. Spectroscopic strengths for states of the multiplets [${{g}_{\frac{9}{2}}}^{\ensuremath{-}1}{d}_{\frac{5}{2}}$] and [${{g}_{\frac{9}{2}}}^{\ensuremath{-}1}{s}_{\frac{1}{2}}$] have been determined by detailed distorted-wave Born-approximation analysis. ${J}^{\ensuremath{\pi}}$ assignments are suggested on the basis of sum rules and comparison with other experiments. Matrix elements for two-particle effective interactions are derived.NUCLEAR REACTIONS $^{87}\mathrm{Sr}(d,p)$, $E=12$ MeV; measured $\ensuremath{\sigma}(\ensuremath{\theta})$ deduced level energies, ${J}^{\ensuremath{\pi}}$; deduced two body matrix elements; enriched targets.

Study of the Odd Strontium Isotopes with Stripping and Pickup Reactions

The ($d,t$) and ($d,p$) reactions induced by 20.65-MeV deuterons have been used to study the levels of $^{87}\mathrm{Sr}$ and $^{85}\mathrm{Sr}$ up to an excitation of 3 MeV. The mass defect of $^{83}\mathrm{Sr}$ has been determined by the ($d,t$) reaction, and its level structure below 3 MeV has been investigated. The cross sections have been analyzed with the distorted-wave Born approximation (DWBA) to determine the $l$ values of the neutron transfers and the spectroscopic factors. Tentative spin assignments have been made on the basis of sum rules and the $j$ dependence of the cross sections.