Reactions with Exotic Nuclei at Near and Sub-barrier Energies

¹ China Institute of Atomic Energy, P.O. Box 275(10), Beijing, 102413, China
² Department of Physics, Guangxi Normal University, Guiline, 541004, China

^* Corresponding author: e-mail: cjlin@ciae.ac.cn
^** Present address: Center for Nuclear Study, University of Tokyo
^*** Present address: Michigan State University
^**** Present address: Joint Institute for Nuclear Research, Dubna

Published online: 4 December 2019

Abstract

We will introduce some new results derived recently by the nuclear reaction group at China Institute of Atomic Energy, on the properties of the optical model potentials of neutron-halo ⁶He system and reaction mechanisms induced by proton-drip line nucleus ¹⁷F at energies around the Coulomb barrier. For the study of optical model potentials of exotic nuclear system, we proposed a novel method, i.e., the transfer reaction method. This method has been applied to extract the optical potentials of neutron-halo ⁶He+²⁰⁹Bi system by measuring the one-proton transfer reactions induced by ⁷Li on a ²⁰⁸Pb target. A complete picture of threshold anomaly behavior was obtained in the ⁶He+²⁰⁹Bi system for the first time, where a decreasing trend of the depth of the imaginary potential is observed in the deep sub-barrier region, and the reaction threshold energy is extracted. Moreover, results show thatthe dispersion relation is not applicable for this exotic nuclear system. Reaction mechanisms of proton-rich nuclear systems ¹⁷F+⁸⁹Y and ⁵⁸Ni were also studied at energies around the Coulomb barrier. Continuum discretized coupled-channels calculations indicate that the coupling effects of the continuum states of ¹⁷F+⁸⁹Y is not significant. Thanks to the employment of a powerful ionization-chamber based detector array, the reaction products over a large Z in the systems of ¹⁷F+⁵⁸Ni can be identified clearly. The data analysis is undergoing.