共查询到13条相似文献,搜索用时 0 毫秒
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The ^8Li(p, d)^7 Li reaction plays an important role in the inhomogeneous Big Bang nucleosynthesis and in the seed-nuclide production phase for the r-process. For the first time, its angular distribution at backward angles was measured in inverse kinematics at Ec.m.=4.0 MeV by using an ^8Li secondary beam. The result of measurement includes the contributions of ^8Li(p, d0)^7Li and ^8Li(p, d1)^7Li^*. The ^8Li(p, d0)^7Li component is estimated to be 40%-58% in the mixture angular distribution by analysing the measured result. 相似文献
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HUACun-Cai LIUYan-Zhu 《理论物理通讯》2002,37(1):21-26
Based on the bifurcation and the idea that the solitary waves and shock waves of partial differential equations correspond respectively to the homoclinic and heteroclinic trajectories of nonlinear ordinary differential equations satisfied by the travelling waves,different conditions for the existence of solitary waves of a perturbed sine-Gordon equation are obtained.All of the corresponding approximate solitary wave solutions are given by integrating the derived approximate equations directly. 相似文献
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Based on an isospin-dependent quantum molecular dynamics model we studied the influence of a medium correction of an isospin-dependent nucleon-nucleon cross section on the fragmentation at the intermediate energy heavy-ion collisions. We found that the medium correction from an isospin-dependent nucleon-nucleon cross section, at the same time, the momentum-dependent interaction also produces an important role for enhancing the influence of the medium correction on the isospin effect of two-body collisions in the fragmentation process. 相似文献
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Influence of the nuclear deformation on the potential energy surface(PES) in a di-nuclear system is studied in details.It is found that the PES shape changes greatly due to the deformation effect.The top point of the PES could be reduced significantly,which implies that the optimum excitation energy could also be reduced greatly and may enhance the fromation probability of the compound nucleus.The dynamical deformaiton as a function of the reaction time in the reaction process is dramatic.The Z/N ratios of fragments tend to follow that of the compound nucleus during the nucleon exchange process,but to fluctuate. 相似文献
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Measurement of One— and Two—Neutron Transfers in Reaction of ^6He+^9Be at 25MeV/u 总被引:1,自引:0,他引:1 下载免费PDF全文
葛愉成叶沿林 郑涛王全进 李智焕李湘庆 江栋兴A.Ozawa Y.Yamaguchi C.Wu R.Kanungo D.Fang I.Tanihata 《中国物理快报》2003,20(7):1034-1037
The cross sections one-and two-neutron transfers induced by 6He at 25MeV/u on a^9Be target were measured in RIKEN.Clear identification of the recoiled Be isotopes was achieved.In total five 11Be and 371 ^10Be events,the corresponding two-and one-neutron transfers were obtained and analysed for transfer reaction cross sections.The results are useful to determine the spectroscopic factors of the internal halo structure of the 6He nucleus. 相似文献
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Calculation of Total Recation Cross Sections Induced by Intermediate Energy α—Particles with the Boltamann—Uehling—Uhlenbeck Model 下载免费PDF全文
ZHONGChen CAIXiang-Zhou SHENWen-Qing ZHANGHu-Yong WEIYi-Bin CHENJin-Gen MAYu-Gang 《中国物理快报》2003,20(5):629-631
The Boltzmann-Uehling-Uhlenbeck(BUU)model,which includes the Fermi motion,the mean field,individual nucleon-nucleon(N-N)interactions and the Pauli blocking effect,etc.,is used to cakulate the total reaction cross section σR induced by a-particlea on different targets in the incident energy range from 17.4 to 48.1 MeV/u. The calculation result can well reproduce the experimental data.The nucleus-nucleas interaction radius parameter ro was extracted from experimental σR.It is found ro becomes constant with the increasing mass number of target. 相似文献
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In the framework of nonperturbative quantum field theory,the critical phenomena of one-dimensional extended Hubbard model (EHM) at half-filling are discussed from weak to intermediate interactions.After the EHM being mapped into two decoupled sine-Gordon models,the ground state phase diagram of the system is derived in an explicit way.It is confirmed that the coexisting phases appear in different interaction regimes which cannot be found by conventional theoretical methods.The diagram shows that there are seven different phase regions in the ground state,which seems not to be the same as previous discussions,especially the boundary between the phase separation and condensed phase regions.The phase transition properties of the model between various phase regions are studied in detail. 相似文献