分类： 物理学 >> 核物理学 提交时间： 2023-06-24
Wang, Yongsheng
Huang, Wenxue
Tian, Yulin
Wang, Junying
Li, Cheng
Zhang, Fengshou
Zhao, Kai
Zhou, Xiaohong
Xu, Hushan
摘要： The multinucleon transfer (MNT) reaction is one promising way to produce neutron-rich heavy nuclei and even super heavynuclei and attracts more and more attentions theoretically and experimentally. A low energy nuclear structure spectrometer calledLENSHIAF specific to the MNT reactions will be designed and constructed in the ongoing big project HIAF in China. In theLENSHIAF spectrometer, the most challenge part is how to collect and stop efficiently the high-energy MNT products into the gascell. By using Monte-Carlo method, the geometry of the gas cell, the thickness of the titanium window/degrader, and the optimalgas pressure filled in the gas cell have been calculated and estimated. For neutron-rich nuclei around N=126 from 136Xe+198Ptreaction, with a titanium window/degrader with a thickness of 2.53.5 um, a cylindrical helium gas cell with a length of 0.6 m and adiameter of 1.2 m can satisfy the requirements to stop the target-like fragments. For heavier and super heavy nuclei from 238U+238Ureaction, with a 58 um thick titanium window/degrader, the cylindrical gas cell has to be as big as a length of at least 1.6 m and adiameter of 1.6 m.
分类： 物理学 >> 核物理学 提交时间： 2023-06-24
摘要： In the past 30 years, synthesis of new isotopes and study of their decay properties have been remaining as high-priority research program at the Institute of Modern Physics, Chinese Academy of Sciences (IMP/CAS). Up to now, 34 new isotopes have been synthesized, 22 of which are heavy and super-heavy nuclei.In this paper, the techniques used and the results obtained at IMP/CAS for the study of heavy and super-heavy nuclei and elements are reviewed chronologically and the perspectives in the near future are introduced.
分类： 物理学 >> 核物理学 提交时间： 2023-06-24
摘要： A new method including two sub-procedures, global search and local refine, has been developed and presented to design a multiple-reflection time-of-flight (MRTOF) mass analyzer. By using this method, a different type of MRTOF mass analyzer, in which each mirror consists of five cylindrical electrodes, has been designed for isobaric separation for Lanzhou Penning Trap (LPT). The optimal potential parameters of the electrodes have been obtained and the maximal resolving power has been achieved to be 1.3x105 with a total time-of-flight of 6.5 ms for an ion species of 40Ar1+. The simulation shows the inaccuracy of the potentials applied to the mirror electrodes must be less than 50 ppm or preferably 20 ppm.
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