Orateur
Description
We will present the progress of the data analysis for the PRISMA + AGATA experiment titled "Probing nucleon-nucleon correlations in the $^{48}$Ca + $^{208}$Pb system below the Coulomb barrier", conducted in March 2023 at LNL. The experiment aimed to measure the transfer probabilities for multi-neutron and multi-proton transfer channels in the $^{48}$Ca + $^{208}$Pb system at energies close to and below the Coulomb barrier.
The experiment was carried out in inverse kinematics, using a $^{208}$Pb beam directed at a $^{48}$Ca target, employing the superconducting PIAVE-ALPI accelerator complex.
In this selected system, both neutron and proton stripping and pick-up processes are open, providing the opportunity to investigate nucleon-nucleon correlations simultaneously for a complete set of transfer channels.
The PRISMA magnetic spectrometer was used to identify the light reaction products with excellent charge and mass resolution, allowing for the clear separation of multiple transfer channels, despite some experimental challenges.
Up to five proton pick-up channels were observed, as well as proton stripping down to -2.
The Q-value distribution for the different transfer channels displays, at least for a few neutron transfers, a well-defined peak centred around the ground-to-ground-state transitions, as expected in a regime where quasi-elastic processes are dominant.
As more nucleons are transferred, a tail toward larger energy losses starts to develop, indicating that secondary processes may contribute.
For all channels, AGATA will provide crucial information about the populated excited states and will allow to extract both the intensities of these excited states and, using also the information measured with PRISMA, the intensities of the ground-state populations.
