Multinucleon transfer in the interaction of 977 MeV and 1143 MeV Hg204 with Pb208

Abstract

A previous study of symmetric collisions of massive nuclei has shown that current models of multi-nucleon transfer (MNT) reactions do not adequately describe the transfer product yields. To gain further insight into this problem, we have measured the yields of MNT products in the interaction of 977 (E/A = 4.79 MeV) and 1143 MeV (E/A = 5.60 MeV) 204 Hg with 208 Pb. We find that the yield of multi-nucleon transfer products are similar in these two reactions and are substantially lower than those observed in the reaction of 1257 MeV (E/A = 6.16 MeV) 204 Hg + 198 Pt. We compare our measurements with the predictions of the GRAZING-F, di-nuclear systems (DNS) and improved quantum molecular dynamics (ImQMD) models. For the observed isotopes of the elements Au, Hg, Tl, Pb and Bi, the measured values of the MNT cross sections are orders of magnitude larger than the predicted values. Furthermore, the various models predict the formation of nuclides near the N=126 shell, which are not observed.

Production mechanism and prediction cross sections of unknown neutron-rich 263–265,267–269Lr isotopes in multinucleon transfer reactions based on the dinuclear system model

“…For half a century, actinide targets are favored to synthesize neutron-rich heavy and superheavy nuclei in MNT experimental studies [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. For other MNT experimental results see references [40][41][42][43][44][45][46][47][48][49][50]. Notably, Wueschel et al [39] studied the 238 U + 232 Th reaction at incident energy of 7.5-6.1 MeV/nucleon and measured the α decay energy and half-life of the products in 2018.…”

Kinetic energy dissipation and fluctuations in strongly-damped heavy-ion collisions within the stochastic mean-field approach

“…The latter is directly connected with excitation energies of reaction products, which should not be too large to maximize the production yield. Regarding the ongoing worldwide experimental effort aiming at producing unknown neutron-rich heavy nuclei [22,[33][34][35][36][37][38][39][40], it is an imperative task to develop a fully microscopic framework for dissipation and fluctuations of the relative motion of colliding nuclei associated with nucleon exchange.…”