Speaker
Description
A solenoid magnetic lens spectrometer \cite{avaa2020electron} was refurbished and upgraded to incorporate measurement of internal-pairs in addition to conversion electrons. An in-beam experiment was performed on a setup where the magnetic lens spectrometer was coupled to a gamma-ray array consisting of seven Compton suppressed HPGe clover detectors. A 1.1 mg/cm$^{2}$ thick $^{50}$Ti target was bombarded with a 30 MeV alpha beam \cite{oakley1987pion}\cite{pronko1974gamma}\cite{morsch1973monopole} in an attempt to excite the $0^{+}$ state at $3.8\;$MeV, which is expected to subsequently decay via internal-pair formation. The populated nuclei were identified and the observed gamma-ray transitions were built into level schemes. A thorough investigation of gamma-internal-pair and gamma-conversion electron coincidence was also carried out both for a radioactive source ($^{207}$Bi) and in-beam data. This study highlights the unique capability of of the solenoid magnetic lens spectrometer in measurements of electric monopole ($E0$: $0^{+}\rightarrow 0^{+}$ or $J^{\pi}\rightarrow J^{\pi}$) transitions, the only significant alternative nuclei decay mode in cases where nuclear decay via gamma-ray emission is forbidden \cite{ANAndreyev}\cite{wood1992coexistence}\cite{kibedi2005electric}\cite{wood1999electric}.
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