Speaker
Description
Transfer reactions have always been of great importance for nuclear structure and reaction mechanism studies. With heavy ions it becomes feasible to transfer several nucleons and a considerable amount of energy and angular momenta from the relative motion to the intrinsic degrees of freedom. So far proton pickup channels have been identified in atomic and mass numbers at energies close to the Coulomb barrier only in few studies.
We will show a comprehensive study of the multinucleon transfer reaction $^{40}$Ar+$^{208}$Pb measured near the Coulomb barrier, by employing the PRISMA magnetic spectrometer. By using the most neutron-rich stable $^{40}$Ar isotope we could populate, besides neutron pickup and proton stripping channels, also neutron stripping and proton pickup channels. Comparison of cross sections between different systems with the $^{208}$Pb target and with projectiles going from neutron-poor to neutron-rich, as well as between the data and GRAZING, will be shown. The results are relevant for future investigations with radioactive beams, especially considering the SPES project.
Multinucleon transfer cross sections have been recently measured for the $^{92}$Mo+$^{54}$Fe reaction, where both proton stripping and pickup channels were populated with similar strength. The excitation function was measured from the Coulomb barrier to far below, by making use of inverse kinematics to detect target recoils at forward angles with PRISMA. We will discuss the yield of the proton transfer channels, whose probability turns out to be stronger than predicted by a simple phenomenological analysis. The measurement followed the successful results recently obtained for the closed shell $^{96}$Zr+$^{40}$Ca [2] and super-fluid $^{116}$Sn+$^{60}$Ni [3] systems were focus was on neutron transfer channels.
[1] T. Mijatovic et al., Phys. Rev. C 94, 064616 (2016).
[2] L. Corradi et al., Phys. Rev. C 84, 034603 (2011).
[3] D. Montanari et al., Phys. Rev. Lett. 113, 052601 (2014).
