Correlated fission fragments from the reaction of 25MeV/u ^(40)Ar+^(209)Bi and their further correlation with a par-tides have been studied for peripheral and central collisions simultaneously.The excitation energy at...Correlated fission fragments from the reaction of 25MeV/u ^(40)Ar+^(209)Bi and their further correlation with a par-tides have been studied for peripheral and central collisions simultaneously.The excitation energy at scission deduced from postscission multiplicity is about 1725 MeV.The fission timescale deduced from prescission multiplicity is about 4×10^(21)s.Systematic analysis of the mass and energy distributions of Hssion fragments as a function of the initial temperature of hot fissioning nuclei reveals the existence of different fission behavior of hot nuclei formed in central and peripheral collisions.Experimental data demonstrate the change of Hssion behavior at T~4MeV.展开更多
In order to clarify whether statistical or dynamical treatments for emission of intermediate mass fragments(IMFs)will be needed in the intermediate energy heavy ion collisions,the measured angular and energy distribut...In order to clarify whether statistical or dynamical treatments for emission of intermediate mass fragments(IMFs)will be needed in the intermediate energy heavy ion collisions,the measured angular and energy distributions of IMF(3≤Z≤6)in 25 MeV/n ^(40)Ar+^(nat)Ag were analyzed by means of statistical calculation code GEMINI and quantum molecular dynamics code(QMD).While the angular distribution calculations with GEMINI code are not compatible with the experimental ones,the QMD calculations for inclusive angular distributions and energy spectra of IMF are in good agreement with the measured ones.展开更多
A specific detection system devoted to the detection of weak γ-activities from neutron-rich isotopes in an element-separated source was developed,and successfully used in a new determination of the half-life of the r...A specific detection system devoted to the detection of weak γ-activities from neutron-rich isotopes in an element-separated source was developed,and successfully used in a new determination of the half-life of the recently identified heavy neutron-rich nuclide ^(208)Hg.This newly measured half-life is 41^(+5)-4min,in agreement with the earlier one of 42^(+23)-11 min obtained by radiochemical milking method,but experimental precision was improved.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.19235011.
文摘Correlated fission fragments from the reaction of 25MeV/u ^(40)Ar+^(209)Bi and their further correlation with a par-tides have been studied for peripheral and central collisions simultaneously.The excitation energy at scission deduced from postscission multiplicity is about 1725 MeV.The fission timescale deduced from prescission multiplicity is about 4×10^(21)s.Systematic analysis of the mass and energy distributions of Hssion fragments as a function of the initial temperature of hot fissioning nuclei reveals the existence of different fission behavior of hot nuclei formed in central and peripheral collisions.Experimental data demonstrate the change of Hssion behavior at T~4MeV.
基金Supported by the National Natural Science Foundation of China under Grant No.19235011。
文摘In order to clarify whether statistical or dynamical treatments for emission of intermediate mass fragments(IMFs)will be needed in the intermediate energy heavy ion collisions,the measured angular and energy distributions of IMF(3≤Z≤6)in 25 MeV/n ^(40)Ar+^(nat)Ag were analyzed by means of statistical calculation code GEMINI and quantum molecular dynamics code(QMD).While the angular distribution calculations with GEMINI code are not compatible with the experimental ones,the QMD calculations for inclusive angular distributions and energy spectra of IMF are in good agreement with the measured ones.
基金Supported by the National Natural Science Foundation of China under Grant No.19275053Fund of Chinese Academy of Sciences under Grant No.KJ-85.
文摘A specific detection system devoted to the detection of weak γ-activities from neutron-rich isotopes in an element-separated source was developed,and successfully used in a new determination of the half-life of the recently identified heavy neutron-rich nuclide ^(208)Hg.This newly measured half-life is 41^(+5)-4min,in agreement with the earlier one of 42^(+23)-11 min obtained by radiochemical milking method,but experimental precision was improved.
