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Superheavy Nuclei and Nuclear HaloNo Access

SHELL CORRECTION ENERGY AND THE ENTRANCE CHANNEL EFFECT ON THE FORMATION OF SUPERHEAVY NUCLEI

The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China

Beijing Radiation Center, Beijing 100875, China

School of Science, Jiangnan University, Wuxi 214122, China

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FENG-SHOU ZHANG

The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China

Beijing Radiation Center, Beijing 100875, China

Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, China

Corresponding author.

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The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China

Beijing Radiation Center, Beijing 100875, China

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https://doi.org/10.1142/S021830130801177XCited by:2 (Source: Crossref)

Abstract

Based on the improved isospin dependent molecular dynamics model in which the shell correction energy of the system is calculated by using deformed two-center shell model and the surface energy of the system is improved by introducing a switch function that combines the surface energies of projectile and target with the one of the compound nucleus. The effects of the shell correction energy on synthesis of superheavy nuclei and the fusion cross sections in asymmetric and nearly symmetric reaction systems leading to the same compound nuclei ⁶²Zn, ⁷⁶Kr, and ²⁰²Pb are studied. The entrance channel mass asymmetry dependence of compound nucleus formation is found by analyzing the shell correction energies, Coulomb barriers and fusion cross sections. The experimental data are described quantitatively by the present model. It is found that the compound nucleus formation is favorable for the systems with larger mass asymmetry.

Work supported by the Natural Science Foundation of China (grant Nos. 10575012 and 10435020), the Science Foundation of Beijing City, and the Science Foundation of Beijing Normal University.

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