Phillip L. Kerr

Analyzing powers for 6L↘i+12C scattering at 30 and 50 MeV

Comparison between elastic analyzing powers at 30 and 50 MeV show no decrease in their magnitude at the higher energy. A combined optical model analysis of both energies shows T21 to arise from the tensor interaction, T20 to be an interference between tensor and J dependent interactions, and iT11 to be the most complicated, arising from an explicit spin‐orbit, tensor, and J dependent interactions. The inelastic 12C vector analyzing powers require an explicit spin‐orbit interaction to reproduce the magnitude of the oscillations.

Optically pumped polarized lithium source at FSU

The dye‐laser optically pumped polarized 6,7Li− ion source of the FSU tandem‐linac heavy‐ion accelerator has completed 11/2 years of operation. Highly polarized beams of 6Li have been accelerated with on target currents typically greater than 50 particle nA. The source uses electro‐optically modulated circularly polarized light to optically pump an atomic beam into a single magnetic substate. Adiabatic rf transitions to other substates enable the polarization to be changed. The polarization of the atomic beam is measured by laser induced fluorescence using a second electro‐optic to modulate the beam from the same laser, and Zeeman tuning. The polarized atomic beam is surface ionized to Li+ and undergoes charge exchange to Li−. The tandem‐linac can accelerate the beam up to 60 MeV.

Interactions obtained from precision polarized 6Li scattering experiments

Detailed analyzing power angular distribution measurements allow the contributions from the different interaction terms responsible for producing them to be isolated. The high quality data needed for these studies can now be taken because of the development of an intense laser pumped alkali ion source with close to maximum polarization and greatly improved reliability.

Weak coupling in [sup 143]Nd

High-spin states of [sup 143]Nd have been studied using the [sup 130]Te([sup 18]O,5[ital n]) reaction at 85 MeV. The yrast states observed up to a tentatively assigned spin of 45/2 can be described in a remarkably simple way by the weak coupling of an [ital f][sub 7/2] neutron to the [sup 142]Nd core nucleus. Our results demonstrate that [sup 143]Nd is one of the best known examples of weak coupling at high angular momentum.