Isotopic Dependence of Production Cross Sections of Superheavy Nuclei in Hot Fusion Reactions

FENG Zhao-Qing; JIN Gen-Ming; FU Fen; LI Jun-Qing

Chinese Physics C> 2007, Vol. 31> Issue(4) : 366-370

Isotopic Dependence of Production Cross Sections of Superheavy Nuclei in Hot Fusion Reactions

Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou,Lanzhou 730000, China2 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China3 Graduate University of Chinese Academy of Sciences, Beijing 100049, China

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The dinuclear system model has been further developed by introducing the barrier distribution function method in the process of heavy-ion capture and fusion to synthesize superheavy nuclei. The capture of two colliding nuclei, formation and de-excitation process of compound nucleus are decribed by using empirical coupled channel model, solving master equation numerically and statistical evaporation model, respectively. Within the framework of the di-nuclear system model, the fusion-evaporation excitation functions of the systems ⁴⁸Ca(²⁴³Am, 3n—5n)^288—286115 and ⁴⁸Ca(²⁴⁸Cm, 3n—5n)^293—291116 are calculated, which are used for synthesizing new superheavy nuclei at Dubna in recent years. Isotopic dependence of production cross sections with double magic nucleus ⁴⁸Ca bombarding actinide targets U,Np,Pu,Am,Cm to synthesize superheavy nuclei with charged numbers Z=112—116 is analyzed systematically. Based on these analysis, the optimal projectile-target combination and the optimal excitation energy are proposed. It is shown that shell correction energy and neutron separation energy will play an important role on the isotopic dependence of production cross sections of superheavy nuclei.

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FENG Zhao-Qing, JIN Gen-Ming, FU Fen and LI Jun-Qing. Isotopic Dependence of Production Cross Sections of Superheavy Nuclei in Hot Fusion Reactions[J]. Chinese Physics C, 2007, 31(4): 366-370.

FENG Zhao-Qing, JIN Gen-Ming, FU Fen and LI Jun-Qing. Isotopic Dependence of Production Cross Sections of Superheavy Nuclei in Hot Fusion Reactions[J]. Chinese Physics C, 2007, 31(4): 366-370. shu

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Received: 2006-08-01
Revised: 2006-09-06

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Isotopic Dependence of Production Cross Sections of Superheavy Nuclei in Hot Fusion Reactions

Corresponding author: FENG Zhao-Qing,

Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou,Lanzhou 730000, China2 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China3 Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2006-08-01

Accepted Date: 2006-09-06

Available Online: 2007-04-05

Abstract: The dinuclear system model has been further developed by introducing the barrier distribution function method in the process of heavy-ion capture and fusion to synthesize superheavy nuclei. The capture of two colliding nuclei, formation and de-excitation process of compound nucleus are decribed by using empirical coupled channel model, solving master equation numerically and statistical evaporation model, respectively. Within the framework of the di-nuclear system model, the fusion-evaporation excitation functions of the systems ⁴⁸Ca(²⁴³Am, 3n—5n)^288—286115 and ⁴⁸Ca(²⁴⁸Cm, 3n—5n)^293—291116 are calculated, which are used for synthesizing new superheavy nuclei at Dubna in recent years. Isotopic dependence of production cross sections with double magic nucleus ⁴⁸Ca bombarding actinide targets U,Np,Pu,Am,Cm to synthesize superheavy nuclei with charged numbers Z=112—116 is analyzed systematically. Based on these analysis, the optimal projectile-target combination and the optimal excitation energy are proposed. It is shown that shell correction energy and neutron separation energy will play an important role on the isotopic dependence of production cross sections of superheavy nuclei.

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Isotopic Dependence of Production Cross Sections of Superheavy Nuclei in Hot Fusion Reactions

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