U.P.B. Sci. Bull., Series A, Vol. 82, Iss. 1, 2020 ISSN 1223-7027 MULTI-NUCLEON TRANSFER REACTIONS IN 238 U + 64 Ni USING GRAZING MODEL A.Sp˘ ataru 1,2,4 , T.Dickel 4,5 , W.R.Plaß 4,5 , J.S.Winfield 4 , P.Constantin 1 , D.L.Balabanski 1,2 , D.Nichita 1,2 , A.Rotaru 3 , A.State 2,3 Multi-nucleon transfer (MNT) reactions give access to heavy exotic neutron-rich nuclei which are difficult to be produced by fission or in fragmentation reactions. The 238 U + 64 Ni MNT reactions taking place inside a gas cell, is simulated with the GRAZING code. Simulations of the release of reaction product from the target and of their slowing down in the He gas of the cell are performed with the GEANT4 software. The space charge effects induced by gas ionization are studied with the SIMION program. The implications for an experimental program using such a setup are discussed. Keywords: multi-nucleon transfer reactions, quasi-fission, cryogenic stop- ping cell 1. Introduction Experimental studies of neutron-rich exotic nuclei along the r-process path aim at improving our understanding in fields like nuclear structure, nu- clear equation of state and nuclear astrophysics. The usual techniques to produce such nuclei, are fission or fragmentation [1]. Reaching the heavy nuclei with Z> 65 in these reactions becomes diffi- cult due to the steeply declining production cross-sections. The cross-section [2] of multi-nucleon transfer (MNT) reactions, where several nucleons are ex- changed between heavy ions colliding at energies slightly above their Coulomb 1 Extreme Light Infrastructure Nuclear Physics, Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, 30 Reactorului Str., 077125 Bucharest Magurele,Romania, e-mail: anamaria.spataru@eli-np.ro 2 Doctoral School in Engineering and Applications of Lasers and Accelerators, University Polytechnica of Bucharest, Romania 3 Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, 30 Reactorului Str., 077125 Bucharest Magurele, Romania 4 GSI Helmholtz Centre for Heavy Ion Research GmbH - Planckstrasse 1, 64291 Darm- stadt,Germany 5 II. Physikalisches Institut,Justus-Liebig-Universitat Giessen,35392 Giessen, Germany 285