Radiochemical study of the kinematics of multi-nucleon transfer reactions in Ca + Cm collisions 10% above the Coulomb barrier

Gtz, M.*; Gtz, S.*; Kratz, J. V.*; Dllmann, Ch. E.*; Mokry, Ch.*; Runke, J.*; Thrle-Pospiech, P.*; Wiehl, N.*; Schdel, M.; Ballof, J.*; Dorrer, H.*; Grund, J.*; Huber, D.*; Jger, E.*; Keller, O.*; Krier, J.*; Khuyagbaatar, J.*; Lens, L.*; Lommel, B.*; Mendel, M.*; Moody, K. J.*; Scharrer, P.*; Schausten, B.*; Shaughnessy, D. A.*; Schmitt, M.*; Steiner, J.*; Trautmann, N.*; Yakushev, A.*; Yakusheva, V.*

The kinematics of multi-nucleon transfer reactions in the Ca + Cm collisions were investigated using a stacked-foil technique and radiochemical separations. In previous studies, isotopic distributions of the products of below-target isotopes were found to be broader than those of above-target isotopes, which had been interpreted as larger contributions of strongly dumped collisions in the productions of below-target isotopes than above-target ones. However, in the present study, the average total kinetic energy loss (TKEL), and thus, the average excitation energies were determined for both below-target and above-target isotopes, and they were found to be similar. This contradicts the previous interpretation, and thus, a new interpretation has been proposed; highly excited above-target products are lost by fission.