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High-spin states in 198Tl were studied using the 197Au( $ \alpha$, 3 n) reaction. The level scheme was considerably extended including two new bands and several non-yrast levels. One of the new bands is possibly a chiral partner to the yrast $ \pi$ h9/2⊗ $ \nu$ i13/2 -1band. Two-quasiparticle-plus-triaxial-rotor model calculations suggest an aplanar orientation of the total angular momenta for these bands, thus supporting possible chirality. [ABSTRACT FROM AUTHOR]

This work was performed to understand the structure of neutron-rich fission fragments around the 130 mass region. A thin 235U target was bombarded by a 14N beam with 10 MeV/ A from the Separated Sector Cyclotron at the iThemba Laboratory for Accelerator Based Sciences, Cape Town, South Africa. The main goal was to detect and identify fission fragments and to obtain their mass distribution by using solar cell detectors in the AFRODITE (African Omnipurpose Detector for Innovative Techniques and Experiments) spectrometer. The X-rays emitted from fission fragments were detected by LEP (Low Energy Photon) detectors and γ-rays emitted from excited states of the fission fragments were detected by CLOVER detectors in the spectrometer. [ABSTRACT FROM AUTHOR]

Excited states in 175Yb, 176Yb and 177Yb were populated via the bombardment of a 176Yb target with a 750 MeV 136Xe beam. Gamma-ray decays from these states were measured with the AFRODITE multi-detector spectrometer. The rotational band previously assigned to the ground state of 177Yb has been reassigned to the first-excited state of 175Yb. A new rotational band based on the ground state of 177Yb is presented, and the band based on the K π = 4- two-quasiparticle state in 176Yb has been identified. Also a candidate for the rotational band based on the K π = 8-, T 1/2 = 11.4(3) s two-quasiparticle state in 176Yb has been found. Comparisons of gK values derived from in-band branching ratios are consistent with the ν9/2+[624] assignment to the ground state of 177Yb, the ν2{9/2+[624] ⊗ 1/2-[510]} assignment to the K π = 4- state and with the ν2{9/2+[624] ⊗ 7/2-[514]} assignment to the K π = 8- metastable excited state in 176Yb. [ABSTRACT FROM AUTHOR]

High-spin states in 197Bi were studied with the AFRODITE γ-ray array at iThemba LABS using the 181Ta( 22Ne, 6 n) reaction at a beam energy of 125 MeV. A new shears band was found and linked to the low-lying states in 197Bi. Its dynamic moment of inertia, $ \Im^{{(2)}}_{}$, is considerably larger than the $ \Im^{{(2)}}_{}$ of the shears bands in the neighbouring Pb isotopes. This is probably a result of the involvement of an additional high- K h9/2 proton orbital. [ABSTRACT FROM AUTHOR]

The Recoil Shadow Anisotropy Method for measuring nanosecond lifetimes is being implemented on the AFRODITE array and four new isomers were found in 198,200Bi, 164Ta and 162Lu. [ABSTRACT FROM AUTHOR]

High spin states in 196Hg were populated in the 198Pt (α, 6n) reaction at 65 MeV and γ-γ coincidence measurements were performed using the AFRODITE array at iThemba LABS. The level scheme was extended and new rotational bands were observed. A new dipole band was found. The previously reported dipole band was linked to other known states. Excitation energies, spins, and parities of all bands were determined. The bands were assigned nucleon configurations based on cranked shell model calculations. [ABSTRACT FROM AUTHOR]