The question of intrinsic reflection asymmetry or stable-octupole deformation in ('227)Ac was studied by the single-proton stripping reactions ('226)Ra(('3)He,d)('227)Ac with E(,3He) = 30 MeV and ('226)Ra((alpha),t)('227)Ac with E(,(alpha)) = 30 MeV and by measuring the magnetic moment of the first excited 3/2('+) state at 27.38 keV by a differential perturbed angular correlation (DPAC) experiment. Theoretical differential cross sections were determined using calculated nuclear structure factors with and without octupole-deformed Woods-Saxon model wave functions. Theoretical values for the magnetic moments of the ground state and first excited state with and without octupole deformation were determined using calculated intrinsic g-factors from folded Yukawa model wave functions. / The results of the proton-stripping cross sections are inconclusive. Some of the levels populated in our studies agree with the stable-octupole model, some with the quadrupole model and the highest intensity level, the 13/2('+) level at 210.92 keV which is populated in both reactions, does not agree with either model. Therefore, further theoretical calculations are required before the question of stable octupole deformation in ('227)Ac can be answered by these single-proton stripping studies. However, we have confirmed several orbital energies predicted by decay scheme studies. Our investigation of the energy spacings of these orbitals shows that the inclusion of a stable octupole deformation in the ('227)Ac nuclear core is necessary even to give the correct order of these orbitals. / A comparison of our measured value for the magnetic moment of the first excited state with a previous measurement for the ground state seems to support stable octupole deformation in ('227)Ac. Therefore, the energy ordering of orbitals and the magnetic moment results are consistent and they seem to support a stable-octupole deformed shape for the ground state parity doublet in ('227)Ac. Furthermore, our results are consistent with the branching ratio determination of the magnetic moment of the first excited state in ('227)Ac which is in agreement with the stable-octupole model prediction. / Source: Dissertation Abstracts International, Volume: 47-03, Section: B, page: 1056. / Thesis (Ph.D.)--The Florida State University, 1986.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_75796 |
| Contributors | MARTZ, HARRY EDWARD, JR., Florida State University |
| Source Sets | Florida State University |
| Detected Language | English |
| Type | Text |
| Format | 245 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
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