Thesis, Notre Dame, Indiana (2007)

X.Wang

Exotic collective excitations at high spin: triaxial rotation and octupole condensation

NUCLEAR REACTIONS ¹³⁰Te(³⁷Cl, 4n), E=170 MeV; measured Eγ, Iγ, γγ-coin, lifetimes by Doppler-shift method. ¹⁶³Tm; deduced high-spin levels, J, π, triaxial superdeformed bands, B(M1)/B(E2), transition quadrupole moments, potential energy surface calculations. ^240,242Pu(²⁰⁸Pb, ²⁰⁸Pb'), ²³⁹Pu(²⁰⁷Pb, ²⁰⁸Pb), E=1300 MeV; measured Eγ, Iγ, γγ-coin, γ(θ) in 'unsafe' Coulomb excitation for ^240,242Pu and single-neutron transfer for ²³⁸Pu. ^238,240,242Pu; deduced high-spin levels, J, π, A₂, A₄.