A source of vector and tensor polarized $\sp{6,7}$Li ions has been constructed and tested. The ion source uses laser optical pumping of an atomic beam of lithium, followed by adiabatic radiofrequency transitions, selectively populating a single magnetic substate of the neutral atom. The atomic beam is formed by vaporizing lithium metal in an oven and extracting the beam through a heated nozzle/collimator assembly. The atomic beam is irradiated transversely in a weak holding magnetic field by electro-optically modulated, circularly polarized light of wavelength 670.8 nm, obtained from a ring dye laser pumped by an Ar$\sp+$ laser. Optical pumping produces a nearly pure $m\sb{F}$ = F population distribution. Adiabatic rf transitions can then be used to transfer the population to any of the other desired magnetic substates. The polarized atomic beam is ionized positively on an electrically heated tungsten strip and charge exchanged to Li$\sp-$ in a cesium vapor. A Wien filter is used to produce the desired spin axis orientation, and then the beam is injected into a tandem Van de Graaff-superconducting linac for acceleration up to 9 MeV/nucleon. A helium gas polarimeter has been calibrated for use in rapid on-line monitoring of the polarization on target. / Cross section angular distributions and a complete set of analyzing powers $T\sb{kq}(\theta$) for the $\sp{12}$C($\sp6\vec{\rm Li}$, $\alpha$)$\sp{14}$N reaction have been measured at 33 MeV. Full finite range DWBA calculations have been performed to analyze the data for states up to $E\sb{x}$ = 9.70 MeV in $\sp{14}$N. Nilsson model wavefunctions for the $\sp{14}$N states were used to calculate deuteron cluster transfer spectroscopic amplitudes. Although the calculations did not produce a satisfactory description of the entire data set, they showed clear evidence of L-mixing effects and a sensitivity to the $\sp6$Li D state. The deduced D state-S state ratio in $\sp6$Li is in agreement with earlier work, and the uncertainty as to the relative sign of the $\sp6$Li = $\alpha$ + d spectroscopic factors was resolved. / Source: Dissertation Abstracts International, Volume: 54-12, Section: B, page: 6269. / Major Professor: Kirby W. Kemper. / Thesis (Ph.D.)--The Florida State University, 1993.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_77076 |
| Contributors | Mendez, Anthony James, II., Florida State University |
| Source Sets | Florida State University |
| Language | English |
| Detected Language | English |
| Type | Text |
| Format | 197 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
Page generated in 0.0015 seconds