Angular correlation measurements, in the ('27)Al(('16)O,(alpha) ('12)C) reaction at 65, 77 and 87 MeV, were used to study the projectile fragmentation process. Three reaction models, incomplete fusion, inelastic breakup and elastic breakup were used to identify the reaction mechanisms responsible for the (alpha)+('12)C production. Comparisons of the predicted angular correlations, from each of the three models, were made with the measured angular correlations at 65, 77 and 87 MeV. The comparisons revealed, that inelastic breakup was the dominant reaction mechanism at all three energies. It was further determined that a small fraction (10-20%) of the (alpha)+('12)C production resulted from the incomplete fusion process at 77 and 87 MeV. At 65 MeV it was found that incomplete fusion could be producing as much as 50% of the (alpha)+('12)C pairs. / The systematics of the measured angular correlations and the measured relative kinetic energy spectra, between the (alpha)+('12)C ejectiles, further supports the conclusion that the inelastic breakup process is predominantly responsible for the (alpha)+('12)C production in the 65 to 87 MeV energy range. / Source: Dissertation Abstracts International, Volume: 47-01, Section: B, page: 0261. / Thesis (Ph.D.)--The Florida State University, 1985.

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.

The reactions ('16)O(('16)O,(alpha)(,0,1))('28)Si* and ('16)O(('16)O,('8)Be(,0,1))('24)Mg* are studied in the energy region from E(,c.m.) (DBLTURN) 12 to 20 MeV. Excitation functions for these reactions leading to the residual 0('+) ground states and 2('+) first excited states are measured in ('(TURN))50 keV steps at (')(THETA)(,c.m.) (DBLTURN) 6.1(DEGREES) for the (alpha)-particle exit channels and at (')(THETA)(,c.m.) (DBLTURN) 1.5(DEGREES) and (DBLTURN)5.7(DEGREES) for the ('8)Be channels. Angular distributions are measured at selected energies and include differential cross sections at 28 angles in the range (THETA)(,c.m.) (DBLTURN) 6(DEGREES) to 91(DEGREES) for the (alpha)(,0,1) exit channels and at 13 angles from (THETA)(,c.m. )(DBLTURN) 12(DEGREES) to 61(DEGREES) for the ('8)Be(,0,1) channels. / A high density of narrow, resonancelike structures ((rho) ('(TURN))3/MeV, (GAMMA) < 100 to ('(TURN))200keV) is observed in the small-angle data. No system- atic variations of the structure width and density with either energy or exit channel are apparent. Distribution-of-maxima statistical tests, applied to the small-angle data, give no evidence for nonstatistical structure in the four exit channels examined. / Energy correlations in angle-summed cross sections reveal several structures which satisfy conventional resonance criteria. Resonant J('(pi)) values are assigned whenever possible based on the energy dependences of coefficients in either linear Legendre expan- sions or interfering angular momentum pair parameterizations of angular distributions of the spin-zero (alpha)(,0) and ('8)Be exit channels. / Statistical-model calculations are used to predict the magnitudes and angular momentum dependences of the compound-nucleus components in the (alpha)(,0,1) and ('8)Be(,0,1) channels. Synthetic excitation functions and angular distributions are generated to determine whether fluctuations resulting from the population and decay of overlapping compound-nucleus levels can produce resonancelike structure similar to that observed in the data. The results of this investigation suggest a fluctuation origin for the intermediate width structure observed in the data including those structures which are found to satisfy conventional resonance criteria. / Source: Dissertation Abstracts International, Volume: 47-06, Section: B, page: 2488. / Thesis (Ph.D.)--The Florida State University, 1986.

The gamma-ray decay of new high spin states in ('25)Mg has been studied using the ('12)C(('14)N,p(gamma))('25)Mg reaction at E(lab) = 23.5 MeV. Proton-gamma coincidences were measured between an E (Si(Li))-(DELTA)E (Si) telescope arrangement at 0(DEGREES) to the beam and either of two Ge(Li) detectors at 90(DEGREES) or four gamma-ray detectors at 90(DEGREES), 81(DEGREES), 60(DEGREES) and 22(DEGREES) in an angular correlation experiment. Also, gamma-gamma coincidences were measured at 90(DEGREES). Experiments were performed at the Florida State University Super FN Tandem Van de Graaff accelerator, and one gamma-gamma coincidence measurement was performed at Triangle University Nuclear Laboratory. Twenty new neutron-unbound levels have been identified, with the range of possible spins narrowed to one or two possibilities for nine levels. / This research was performed to try and confirm the existence of "rotational coexistence" or equivalently "rotational isomerism" predicted to occur at J('(pi)) = 13/2('+) and 17/2('+) in ('25)Mg using the cranked Nilsson-Strutinsky formalism developed by Ingemar Ragnarsson, Tord Bengtsson and Sven Aberg at the Lund Institute of Technology. The same phenomenon has previously been identified with the yrast 8('+) state in ('24)Mg, where the eight units of angular momentum result from alignment of the spins of four s-d shell (valence) nucleons along the axis of rotation. The noncollective behavior of this state yields a prolate shape rotating parallel to the nuclear symmetry axis, and it is energetically favored relative to the prolate 8('+) ground state band member rotating perpendicular (collectively) to the symmetry axis. / Shell model calculations performed by Hobson Wildenthal at Drexel University, using an untruncated s-d shell basis space, have also been compared extensively with experiment. Based on the angular correlation results and correspondence with shell model and cranked Nilsson model predictions, tentative spin assignments have been made for the yrast 15/2('+), 17/2('+) and possibly 9/2('-) states, and the 13/2('+) and 15/2('+) ground state band members. The yrast 17/2('+) and previously observed 13/2('+) states are interpreted to be rotationally aligned, prolate shaped configurations. / Source: Dissertation Abstracts International, Volume: 48-02, Section: B, page: 0478. / Thesis (Ph.D.)--The Florida State University, 1987.

Mixed density expansion techniques previously used to study the spectroscopic content of the non-local knockout exchange amplitudes for nucleon-nucleus scattering in the plane wave approximation (PWA) are extended to the more realistic distorted wave approximation (DWA). This approach provides a clear basis for assessing specific spectroscopic consequences of the knock-out amplitudes and the means for developing suitable approximations to simplify the treatment of these amplitudes. Since the final reaction amplitudes are computed in momentum space, distortion effects are displayed in a form that allows for the most direct comparison between the strong nucleon-nucleus scattering reaction and the well understood electron-nucleus scattering reaction. As a specific application of the formalism, results are presented for polarization transfer observables for stretched excitations in light nuclei. Polarization transfer is a topic of current interest in nucleon-nucleus scattering. / Source: Dissertation Abstracts International, Volume: 55-03, Section: B, page: 0970. / Major Professor: Fred Petrovich. / Thesis (Ph.D.)--The Florida State University, 1993.

The formation of sub-structures within an atomic nucleus, appropriately termed nuclear clustering, is one of the core questions of nuclear many-body physics. In this thesis, we put forward a new method for the study of nuclear clustering relying on the completely microscopic Configuration Interaction approach. We construct reaction cluster channels in a Harmonic Oscillator many-body basis that respect the symmetries of the Hamiltonian, are fully antisymmetrized, and carry a separable and controlled Center of Mass component. Such channels are then used to explore cluster signatures in Configuration Interaction many-body wavefunctions. The Resonating Group Method is then applied, utilizing the reaction channels as a basis to capture the essential cluster characteristics of the system. We investigate the emergence of nuclear clustering in 2α, 2α+n, 2α+2n and 3α systems using a No Core Shell Model approach from first principles, and traditional Shell Model studies of clustering in heavier nuclei. / A Dissertation submitted to the Department of Physics in partial fulfillment of the requirements for the degree of Doctor of Philosophy. / Summer Semester 2018. / May 11, 2018. / Includes bibliographical references. / Alexander Volya, Professor Directing Dissertation; David Kopriva, University Representative; Ingo Weidenhoever, Committee Member; Simon Capstick, Committee Member; Laura Reina, Committee Member.

Source: Dissertation Abstracts International, Volume: 31-09, Section: B, page: 5552. / Thesis (Ph.D.)--The Florida State University, 1970.

Source: Dissertation Abstracts International, Volume: 30-02, Section: B, page: 0790. / Thesis (Ph.D.)--The Florida State University, 1968.

Source: Dissertation Abstracts International, Volume: 30-05, Section: B, page: 2364. / Thesis (Ph.D.)--The Florida State University, 1969.

Source: Dissertation Abstracts International, Volume: 30-12, Section: B, page: 5645. / Thesis (Ph.D.)--The Florida State University, 1969.