Abstract
Multi-nucleon transfer reactions are nowadays the only known mean to produce neutron-rich nuclei in the Terra Incognita. The closed-shell region N=126 is crucial for both studying shell-quenching in exotic nuclei and the r-process, being its last “waiting-point”. The choice of suitable reactions is challenging and a favorable case is 136Xe+208Pb, near the Coulomb barrier, because their neutron shell-closures play a stabilizing role, favoring the proton-transfer from lead to xenon. TOF-TOF data were analyzed to reconstruct the mass-energy distribution of the primary fragments. Preliminary results of an experiment held at Laboratori Nazionali di Legnaro with PRISMA, aimed at A and Z identification of the products, will be shown.
Highlights
The exploration of the the unknown regions of the Segré map and the potential discovery of the Island of Stability represents one of the most interesting challenges in nuclear physics and astrophysics
It has been shown experimentally that even at low bombarding energies the cross sections for transfer of several protons and neutrons are still rather high [3], and this kind of reactions could be considered as an alternative way for the production of exotic nuclei
The satisfactory agreement between experimental data and calculation [2], within the model [5] proposed by Zagrebaev and Greiner, gave confidence in obtaining reliable cross section estimations of near-barrier multinucleon transfer reactions producing heavy neutron-rich species
Summary
The exploration of the the unknown regions of the Segré map and the potential discovery of the Island of Stability represents one of the most interesting challenges in nuclear physics and astrophysics. If the colliding energy and the reaction Q-value are rather low, the primary fragments might not be very much excited and will descend to their ground states after evaporation of few neutrons, remaining far from the stability line.
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