Date/Time: Tue May 13 2025 at 11:00<br/><br/>Location: ISAC Conference Room<br/><br/>Speaker: Beatriz Fernandez Dominguez (U de Santiago de Compostela)<br/><br/>Title: Transfer reactions with the ACTAR TPC and the experimental campaign at TRIUMF<br/><br/>Abstract: Direct reactions are fundamental tools to investigate the structure of exotic nuclei. Studies of nuclei far away from stability are usually performed with secondary radioactive beams, which suffer from low intensities and need to be compensated for with thick targets and highly efficient detection systems to increase the luminosity. Originally, these transfer experiments required the use of complex arrays of particle and gamma detection systems to improve selectivity. The use of active targets overcomes the aforementioned difficulties and is particularly well suited to explore new regions of the nuclear chart with unprecedented resolution using a much more compact detection system. Active targets are invaluable devices that, among other important features, allow to reconstruct the reaction in three dimensions without loss of resolution.
The ACtive TARget and Time Projection Chamber (ACTAR TPC) detector has been developed at GANIL to cover a broad physics programme. In this talk, I will first present the results from the single-proton 20O(d,3He)19N and single-neutron removal reactions 20O(d,3H)19O which aimed at studying the proton and neutron, 0p1/2 - 0p3/2 spin-orbit splitting, in neutron-rich oxygen isotopes. Results were compared to state-of-the art shell model calculations using the SFO-tls interaction. The comparison revealed a reduction of the proton spin-orbit splitting due to the tensor force. This finding is in disagreement with the results previously reported by Tran et al. In the second part, I will present the upcoming experimental campaign at TRIUMF, highlighting the benefits through the use of active target techniques in this context.
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