Analysis of multinucleon transfer reactions with spherical and statically deformed nuclei using a Langevin-type approach

V. V. Saiko and A. V. Karpov
Phys. Rev. C 99, 014613 – Published 15 January 2019

Abstract

Background: In recent years, there has been increasing interest in multinucleon transfer processes in low-energy deep inelastic (damped) collisions of heavy ions. Partly, it was provoked by a possibility of using them as a method of production of heavy neutron-enriched nuclei. Possible promising projectile-target combinations include nuclei deformed in the ground state (e.g., actinides). Mutual orientations of such nuclei in the entrance channel of a reaction may significantly influence the reaction dynamics.

Purpose: The major aim of the work is to implement a possibility of modeling collisions of statically deformed heavy nuclei within a multidimensional dynamical model based on the Langevin equations. Another purpose of the paper is to study the influence of mutual orientations of statically deformed nuclei on their collision dynamics. Finally, production yields of heavy transuranium nuclei in collisions of actinides are examined.

Method: An analysis has been performed within a multidimensional dynamical model of nucleus-nucleus collisions based on the Langevin equations [Phys. Rev. C 96 024618 (2017)]. In the present paper, the model has been improved to describe collisions of statically deformed heavy nuclei with different mutual orientations.

Results: The available experimental data on multinucleon transfer reactions with statically deformed as well as spherical heavy nuclei Sm144+Sm144, Sm154+Sm154, Gd160+W186, and Pb208+Pb208,U238 have been analyzed within the developed model. A good agreement of the calculated quantities with the corresponding experimental data has been reached. Special attention in the paper is paid to analyzing the possibility of producing neutron-enriched isotopes of heavy and superheavy elements in multinucleon transfer processes in U238+U238,Cm248,Es254 collisions.

Conclusions: Mutual orientation of colliding statically deformed nuclei in the entrance channel strongly affects the energy, angular, mass, and charge characteristics of multinucleon transfer reaction products at near-barrier energies. These orientational effects disappear with increasing collision energy well above the Coulomb barrier. An exponential drop in the isotopic distributions of the above-target products formed in the collisions of actinides with an increasing atomic number does not allow one to synthesize new isotopes of superheavy nuclei with experimentally reachable cross sections. However, there is a possibility to produce a number of neutron-enriched isotopes of heavy actinides with cross sections exceeding 1 μb.

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  • Received 4 June 2018
  • Revised 26 November 2018

DOI:https://doi.org/10.1103/PhysRevC.99.014613

©2019 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

V. V. Saiko and A. V. Karpov*

  • Flerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna, Russia and Department of Nuclear Physics, Dubna State University, 141982 Dubna, Russia

  • *karpov@jinr.ru

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Vol. 99, Iss. 1 — January 2019

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