Conveners
Session 5: Nuclear Structure, Reactions and Dynamics
- Akaa Daniel Ayangeakaa (University of North Carolina at Chapel Hill)
Low-energy Coulomb excitation is a powerful tool for studying collective properties and shape evolution in atomic nuclei. At the INFN Legnaro National Laboratories (LNL), we have been conducting a long-term experimental campaign using the SPIDER detector, an array of segmented silicon detectors specifically designed for Coulomb-excitation experiments. SPIDER has been used in combination with...
Mid-shell Cd nuclei were traditionally considered to be the best examples of vibrational nuclei. Recent studies that combined detailed γ-ray spectroscopy with sophisticated beyond-mean-field calculations had suggested [1,2] that the low-lying 0+ states in 110,112Cd possessed prolate, triaxial, and oblate shapes with rotational-like bands built upon them. If confirmed, this would have major...
Neutron-rich ruthenium nuclei with mass around A≈110 are considered some of the best examples for nuclei with triaxial shape in their ground state. Quantitative information about the deformation in general and the degree of triaxiality in particular was obtained from lifetime measurements of short-lived excited states in $^{108}$Ru, $^{110}$Ru, and $^{112}$Ru. Lifetimes were measured using the...
we focus on the evolution of triaxiality from γ-soft toward rigid triaxial shapes in Mo and Ru chains above N = 60. Spectral criteria for the second-order phase transition are suggested and examined. Both chains are investigated within the phenomenological Algebraic Collective Model and in the framework of microscopic Skyrme-Hartree-Fock + Bardeen-Cooper-Schrieffer calculations.
Nuclei around the rare earth transitional region (N ~ 90) present a variety of interesting nuclear structure features ranging from triaxiality, octupoles and shape coexistence. The neutron deficient- nucleus 158Er (N = 90) lies at the boundary of the phase-transitional region, hence, it is likely to display of both transitional and deformed characteristics [1]. Properties of the low-lying...
The low spin states of $^{164}$Hf were populated using the in-beam $^{148}$Sm($^{20}$Ne,4n)$^{164}$Hf reaction at the iThemba LABS AFRODITE facility. The data analysis revealed a new gamma band, 2$^{+}_2$, situated 0.8 MeV above the ground band. Measurements of spins and parities through the angular distribution ratios (DCO) and polarization confirms the placement of the new gamma band....
