The conditional moments of the charge distributions of the projectile frag-ments in <sup>16</sup>O and <sup>32</sup>S fragmentation behaviour are obtained by using a partition meth-od.The logar...The conditional moments of the charge distributions of the projectile frag-ments in <sup>16</sup>O and <sup>32</sup>S fragmentation behaviour are obtained by using a partition meth-od.The logarithmic correlations between the conditional moments are observed,Thecalculated results are in agreement with the experimental data of 3.7 and 200GeV N <sup>16</sup>O-emulsion and 200 GeV/N <sup>32</sup>S-emulsion interactions.展开更多
The threshold energies of radial flow in reactions of ^40 Ca-^40Ca and ^48Ca＋ ^48Ca in central collisions are investigated within an isospin dependent quantum molecular dynamics model by using three different forms o...The threshold energies of radial flow in reactions of ^40 Ca-^40Ca and ^48Ca＋ ^48Ca in central collisions are investigated within an isospin dependent quantum molecular dynamics model by using three different forms of symmetry energy. It is found that the neutron-rich system has smaller threshold energy of radial flow and this quantity depends on the form of symmetry potential. It is indicated that the threshold energy of radial flow can provide a new method to determine the symmetry energy of asymmetric nuclear matter.展开更多
The angular distributions of the fragments such as <sup>7</sup>Be,<sup>24</sup>Na and <sup>28</sup>Mg pro-duced in the 600 MeV <sup>40</sup>Ar+<sup>197</sup>...The angular distributions of the fragments such as <sup>7</sup>Be,<sup>24</sup>Na and <sup>28</sup>Mg pro-duced in the 600 MeV <sup>40</sup>Ar+<sup>197</sup>Au reaction are measured using off-line γ-rayspectroscopy technique.After subtraction of the contribution of fission process,thewidth σ<sub>p</sub> of the transverse momentum distribution is extracted from the analysis of thefragment angular distribution data in the framework of the projectile fragmentationmechanism.The results are compared with the calculated values of Goldhaber statisticalmodel.展开更多
Exclusive intermediate mass fragments（IMFs）are measured at forward angles forthe <sup>40</sup>Ar+<sup>nal</sup>Ag reaction at 30 MeV/u.The impact parameter is determined using the totaltransv...Exclusive intermediate mass fragments（IMFs）are measured at forward angles forthe <sup>40</sup>Ar+<sup>nal</sup>Ag reaction at 30 MeV/u.The impact parameter is determined using the totaltransverse momentum method and linear momentum transfer method.IMFs emitted at forwardangles mainly come from projectile fragmentation in peripheral collisions,while IMFs in centralcollision mainly come from decay of hot target-like sources.IMFs from both projectile-like andtarget-like sources are observed in mid-central collision.In addition,the third component,non-equilibrium mid-rapidity components are observed in central,mid-central and peripheralcollisions.展开更多
A two-component(considering the transfer reaction and fragmentation process,respectively)model is proposed to calculate the width of the momentum distribution of projectile-like-fragment(PLF)from heavy ion reaction.Th...A two-component(considering the transfer reaction and fragmentation process,respectively)model is proposed to calculate the width of the momentum distribution of projectile-like-fragment(PLF)from heavy ion reaction.The theoretical results are compared with the experimental data.展开更多
本文对最高束流能量为290 A MeV的^(12)C核诱发铝靶核反应射弹碎裂电荷变化反应总截面及碎片粒子产生分截面进行研究.结果显示射弹碎裂电荷变化总截面及碎片粒子产生分截面在误差范围内与束流能量无关,核碎裂电荷变化总截面计算结果与Br...本文对最高束流能量为290 A MeV的^(12)C核诱发铝靶核反应射弹碎裂电荷变化反应总截面及碎片粒子产生分截面进行研究.结果显示射弹碎裂电荷变化总截面及碎片粒子产生分截面在误差范围内与束流能量无关,核碎裂电荷变化总截面计算结果与Bradt-Peter公式及PHITS,NUCFRG2理论模型预测值一致,碎片粒子产生分截面值与NUCFRG2理论模型预测值一致.展开更多
基金The project supported by the National Natural Science Foundation of China.
文摘The conditional moments of the charge distributions of the projectile frag-ments in <sup>16</sup>O and <sup>32</sup>S fragmentation behaviour are obtained by using a partition meth-od.The logarithmic correlations between the conditional moments are observed,Thecalculated results are in agreement with the experimental data of 3.7 and 200GeV N <sup>16</sup>O-emulsion and 200 GeV/N <sup>32</sup>S-emulsion interactions.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10575012 and 10435020, the Science Foundation of Beljlng, and the Science Foundation of Beijing Normal University.
文摘The threshold energies of radial flow in reactions of ^40 Ca-^40Ca and ^48Ca＋ ^48Ca in central collisions are investigated within an isospin dependent quantum molecular dynamics model by using three different forms of symmetry energy. It is found that the neutron-rich system has smaller threshold energy of radial flow and this quantity depends on the form of symmetry potential. It is indicated that the threshold energy of radial flow can provide a new method to determine the symmetry energy of asymmetric nuclear matter.
基金The project supported by the National Natural Science Foundation of China
文摘The angular distributions of the fragments such as <sup>7</sup>Be,<sup>24</sup>Na and <sup>28</sup>Mg pro-duced in the 600 MeV <sup>40</sup>Ar+<sup>197</sup>Au reaction are measured using off-line γ-rayspectroscopy technique.After subtraction of the contribution of fission process,thewidth σ<sub>p</sub> of the transverse momentum distribution is extracted from the analysis of thefragment angular distribution data in the framework of the projectile fragmentationmechanism.The results are compared with the calculated values of Goldhaber statisticalmodel.
基金The Project supported by National Natural Science Foundation of China
文摘Exclusive intermediate mass fragments（IMFs）are measured at forward angles forthe <sup>40</sup>Ar+<sup>nal</sup>Ag reaction at 30 MeV/u.The impact parameter is determined using the totaltransverse momentum method and linear momentum transfer method.IMFs emitted at forwardangles mainly come from projectile fragmentation in peripheral collisions,while IMFs in centralcollision mainly come from decay of hot target-like sources.IMFs from both projectile-like andtarget-like sources are observed in mid-central collision.In addition,the third component,non-equilibrium mid-rapidity components are observed in central,mid-central and peripheralcollisions.
基金The project supported by the National Natural Science Foundation of China
文摘A two-component(considering the transfer reaction and fragmentation process,respectively)model is proposed to calculate the width of the momentum distribution of projectile-like-fragment(PLF)from heavy ion reaction.The theoretical results are compared with the experimental data.
文摘本文对最高束流能量为290 A MeV的^(12)C核诱发铝靶核反应射弹碎裂电荷变化反应总截面及碎片粒子产生分截面进行研究.结果显示射弹碎裂电荷变化总截面及碎片粒子产生分截面在误差范围内与束流能量无关,核碎裂电荷变化总截面计算结果与Bradt-Peter公式及PHITS,NUCFRG2理论模型预测值一致,碎片粒子产生分截面值与NUCFRG2理论模型预测值一致.
