The study of rotational phenomena in technetium-99
Abstract
The level-structure of $\sp{99}$Tc was investigated using the $\rm\sp{98}Mo(\sp3He,pn\gamma)\sp{99}$Tc reaction, which populated many new non-yrast states below 2MeV. The proton exit channel of the reaction was selected from competing reaction channels by using large solid angle proton detectors in coincidence with $\gamma$-ray detectors. A new experimental technique was developed to reduce high counting rate effects in the proton-$\gamma$ coincidence system. Excitation functions, angular distributions and $\gamma$-$\gamma$ coincidences experiments were performed and analyzed to construct a level scheme for $\sp{99}$Tc. A comparison of the experimental data to a symmetric-particle-rotor model was performed. The model used a rotational Hamiltonian in the strong coupling limit. It treated Coriolis and recoil terms to all orders, and it included a variable moment of inertia to explain the compression in energy levels. Two complete rotational multiplets were identified for positive parity states along with three rotational bands for negative parity states.
Degree
Ph.D.
Advisors
Simms, Purdue University.
Subject Area
Nuclear physics
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