Microscopic studies of production cross sections in multinucleon transfer reaction Ni58+Sn124

Abstract

Background: Multinucleon transfer reaction at low-energy collisions is considered to be a promising method for the production of new exotic nuclei, which are difficult to be produced by other methods. The theoretical studies are required to provide reliable predictions for the experiments and promote the understanding of the microscopic mechanism in multinucleon transfer reactions. Purpose: We provide a predictive approach for production cross sections, and testify how and to what extent the microscopic approach works well in multinucleon transfer reaction. Methods: We employ the approach TDHF+GEMINI, which combines the microscopic time-dependent Hartree-Fock (TDHF) with the state-of-art statistical model GEMINI++, to take into account both the multinucleon transfer dynamics and the secondary deexcitation process. The properties of primary products in multinucleon transfer process, such as transfer probabilities and primary cross sections, are extracted from TDHF dynamics by using the particle-number projection method. Production cross sections for secondary products are evaluated by using the statistical model GEMINI++.Results: We investigate the influence of colliding energies and deformation orientations of target and projectile nuclei on multinucleon transfer dynamics in the reaction 58 Ni+ 124 Sn. More nucleons are observed to transfer in the tip collision as compared to the side collision. The production cross sections for secondary fragments with TDHF+GEMINI calculations well reproduce the experimental measurements at energies close to the Coulomb barrier. At sub-barrier energy, the theoretical results gradually deviate from the experimental data as the increase of the number of transferred neutrons, implying the limitations of a single mean-field approximation in TDHF approach. Possible origins for this discrepancy are discussed. The total cross sections integrated over all the neutron pickup channels are in good agreement with the experimental data for all the energies. We compare the production cross sections of TDHF+GEMINI calculations with those from GRAZING model, and find that our approach gives a quantitatively good description as the semiclassical model, although there is no adjustable parameters for the reaction dynamics in the microscopic TDHF method. Conclusions: The microscopic approach TDHF+GEMINI reasonably reproduces the experimental data at energies close to the Coulomb barrier and well accounts for the multinucleon transfer mechanism. The present studies clearly reveal the applicability of TDHF+GEMINI method in multinucleon transfer reactions, which thus deserves as a promising tool to predict the properties of new reactions. * luguo@ucas.ac.cn hance the yield of exotic nuclei for an appropriate projectiletarget combination. To produce the new unstable isotopes experimentally, the optimal incident energy and projectile-target combination should be chosen to have the highest product cross section for the desired isotope. The reliable theoretical predictions are therefore required to guide ...

Microscopic predictions for the production of neutron-rich nuclei in the reaction Yb176 + Yb176Godbey1, Simenel2, Umar3 2020Phys. Rev. C300200View full textAdd to dashboardCite

“…7 presents an exciting range of previously inaccessible nuclei, with the above caveat applying the further one goes from the center of the distribution. Another caveat is that the predicted distribution is for primary fragments only and that statistical decay should be included in order to predict fragment produced after evaporation, e.g., following [22,51,138].…”

“…Over the years, many theoretical approaches to studying neutron-rich nuclei formation have been pursued for various reaction types. One such technique is to use models to study neutron enrichment via multinucleon transfer (MNT) in deepinelastic collisions (DIC) and quasifission reactions [14][15][16][17][18][19][20][21][22]. While quasifission occurs at a much shorter time-scale than fusion-fission [23,24] and is the primary reaction mechanism that limits the formation of superheavy nuclei, the fragments produced may still be neutron-rich.…”

“…Theoretically, the investigation of collisions between very heavy nuclei has a rich history with various approaches, including the dinuclear system (DNS) model [31][32][33][34][35][36][37][38], relativistic mean-field (RMF) and Skyrme HF studies [39], reduced density-matrix formalism [40], Langevin equation [41][42][43][44], quantum molecular dynamics (QMD) [45], and improved quantum molecular dynamics (ImQMD) [20,[46][47][48][49] calculations, as well as timedependent Hartree-Fock (TDHF) studies [17,19,50]. Over recent years, TDHF has proved to be a tool of choice to investigate fragment properties produced in various reactions, such as DIC [22,51], quasifission [21,28,47,[52][53][54][55][56][57], and fission [58][59][60][61][62][63][64][65][66][67]. Recent reviews [68,…”

Predictions of New Neutron-Rich Isotopes at N = 126 in the Multinucleon Transfer Reaction 136Xe + 194Ir

“…The improved quantum molecular dynamics (ImQMD) model [24][25][26] is capable of describing collisions from central to very peripheral regions on a microscopic basis, the widths of isotopic distributions can be reproduced in ImQMD since stochastic two-body collisions are taken into account [27][28][29]. The time-dependent Hartree-Fock (TDHF) theory shows success in describing few-nucleon transfer process [30][31][32][33][34]. Recently, the stochastic mean-field (SMF) approach beyond TDHF [35] has been proposed to investigate the damped MNT reaction 136 Xe + 208 Pb, the experimental broad mass distribution can be reproduced.…”

“…It has been applied for investigations on various subjects, for instance, collective vibration [38,39], fusion reaction [40,41], fission dynamics [42][43][44], dissipation mechanism [45][46][47][48]. Recently, 3D TDHF is applied to MNT reactions [30][31][32][33]49]. Fluctuation and dissipation can not be properly described in TDHF since twobody collisions and internucleon correlations are not included.…”