Abstract
We studied multinucleon transfer reactions in the 197Au+130Te system at Elab=1.07 GeV by employing the PRISMA magnetic spectrometer coupled to a coincident detector. For each light fragment we constructed, in coincidence, the distribution in mass of the heavy partner of the reaction. With a Monte Carlo method, starting from the binary character of the reaction, we simulated the de-excitation process of the produced heavy fragments to be able to understand their final mass distribution. The total cross sections for pure neutron transfer channels have also been extracted and compared with calculations performed with the grazing code.
Highlights
The production of neutron-rich heavy nuclei in the region of lead, i.e., near the N = 126 shell closure, received in recent years a boost of interest since the properties of these nuclei are fundamental for the understanding of the actual path, in the (N,Z) plane, that is chosen by the r-process to synthesize the heavy elements
The total cross sections for pure neutron transfer channels have been extracted and compared with calculations performed with the GRAZING code
With neutron-rich projectiles it has been predicted in Ref. [1] a change in the population pattern that leads to primary neutron-rich heavy partners
Summary
The path leading to primary neutron-rich heavy partners, in multinucleon transfer reactions, has been investigated in recent high-resolution experiments with neutron-rich stable projectiles, in 64Ni + 238U [9], 40Ar + 208Pb [10], 136Xe + 198Pt [11], and 136Xe + 238U [12] In these reactions the light partner has been identified directly via high-resolution magnetic spectrometers while, in some of the mentioned cases, information on the heavy partner was obtained indirectly by detecting the coincident γ rays produced by the fragments. Investigations carried out with radiochemical methods in heavy actinides [16] indicate that neutron-rich nuclei are produced in the low-energy tails of the dissipated energy distributions In all these experiments it has been emphasized that secondary processes may significantly influence the final yield distributions, even though rather meager evidence of the survival probability of the heavy partner has been provided. Favorable experimental conditions were achieved by employing inverse kinematics in such a way that both the light recoil and the heavy partner could have enough energy for their detection
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