Speakers
Description
The study of monopole transitions via excited 0+ states requires the measurement of internal conversion electrons and internal pair formation using an electron spectrometer. Such a spectrometer, consisting of a solenoid magnet transporter and a Si(Li) detector with an array of LaBr3, is undergoing development at iThemba LABS. Performance of the electron spectrometer has been investigated using radioactive sources produced at iThemba LABS. The spectrometer has been used in lens mode with the field swept under computer control. Transmission and efficiency, as well as the momentum resolution of the swept lens, are presented. Commissioning experiments are due to take place in July 2018 using an alpha beam at a maximum of Eα = 30 MeV with a beam current of 10enA on isotopically enriched 70Ge which will provide an opportunity to investigate E0 transitions in the target nucleus. This serves as a sensitive probe for the study of shape coexistence in nuclei since the monopole strength parameter is related to the change in mean square radius between the initial and final 0+ states.
