Abstract
We present new results on multi-nucleon transfer reactions in low-energy collisions of ^{48}hbox {Ca}+{}^{238}hbox {U} measured at the velocity filter SHIP of GSI Helmholtz Centre, where we observed around 90 different nuclides from Tl to Am (Z= 81–95). We followed the idea to use uranium targets for the synthesis of neutron-rich MNT products, particularly in the region below lead, which was triggered by model calculations. The gamma , alpha and spontaneous fission activities of the populated nuclides have been analyzed for their identification. The cross-sections of the observed isotopes for elements Z = 81–93 as a function of their mass number have been investigated. Excitation energy, total kinetic energy and the influence of nuclear shell effects on the production cross-sections of the observed transfer products have been studied. Also we present a compact review and comparative analysis of various multi-nucleon transfer and fragmentation reactions which are aimed at the synthesis of neutron-rich nuclides along the N=126 shell closure in heavy nuclei.
Highlights
Exploring the heavy neutron-rich nuclei and their decay sequences to the valley of β stability is supremely interesting for the understanding of the predicted r-process path
We present new results on multi-nucleon transfer reactions in low-energy collisions of 48Ca+238U measured at the velocity filter SHIP of GSI Helmholtz Centre, where we observed around 90 different nuclides from Tl to Am (Z = 81–95)
We present a compact review and comparative analysis of various multi-nucleon transfer and fragmentation reactions which are aimed at the synthesis of neutron-rich nuclides along the N = 126 shell closure in heavy nuclei
Summary
Exploring the heavy neutron-rich nuclei and their decay sequences to the valley of β stability is supremely interesting for the understanding of the predicted r-process path. The evolution of the nuclear shells far from the valley of stability and along the neutron shell N = 126 is still an open question. The most neutron-rich nuclei in this area were so far produced by using 208Pb and 238U fragmentation reactions. They reached the cross-section level down to picobarns [1,2]. In these experiments, cross-sections are decreasing very steeply after stripping of every proton along N = 126
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