Speaker
Description
The shape coexistence phenomenon close to the midshell N=104 in the lead region has been under study for several decades. The E0 transitions can be used to study this phenomenon. These transitions can be detected mainly through internal conversion in this region. To investigate this phenomenon, the combined conversion electron and gamma-ray spectroscopy experiments IS563 and IS699 were performed for $^{182,184,185}$Hg using Coulomb excitation reaction. The experiments were done in November 2022 and July 2023 utilising the MINIBALL [1] and SPEDE spectrometer [2]. This experimental setup allows sensitivity for E0 transition. Additionally, these were the first radioactive beam experiments conducted with the SPEDE spectrometer at the MINIBALL setup.
The SPEDE spectrometer is a 24-pixel silicon detector located upstream from respect to the target to detect conversion electrons. The MINIBALL germanium detector array surrounds the target chamber to detect gamma rays, and the CD detector is located downstream for particle identification. This setup allows us to detect gamma rays and conversion electrons simultaneously. The results of these experiments are still under analysis.
[1] Warr, N., et al (2013). The Miniball spectrometer. Eur. Phys. J. A, 49(3), 40. https://doi.org/10.1140/epja/i2013-13040-9
[2] Papadakis, P., et al (2018). The SPEDE spectrometer. European Physical Journal A, 54(3), 1–8. https://doi.org/10.1140/epja/i2018-12474-9
*On behalf of the IS563 and IS699 collaboration
