基于量子分子动力学输运模型LQMD(Lanzhou Quantum Molecular Dynamics transport model)框架下,分别采用Skyrme能量密度泛函和相对论协变密度泛函研究了反质子引起的核反应中粒子产生和靶核碎裂机制.以入射动量为5 GeV/c反质子轰击58Ni散裂反应为例,分析了两种不同平均场下产生粒子π、K、Λ和∑随时间的演化和相空间分布,以及核碎片和超核碎片的质量和电荷分布.结果显示,两种平均场下产生粒子的相空间分布相似,而碎片分布不同,特别是中等质量碎片的产额.碰撞系统在相对论平均场下涨落效应更加明显,导致碎片产额偏高.
Study on the Dynamics of Particle Formation and Supernucleus Forma-tion Mechanism in Antiproton-induced Nuclear Reactions
Within the framework of Lanzhou quantum molecular dynamics(LQMD)transport model,we investigate the particle production and fragmentation mechanism of target nucleus induced by antiproton with the Skyrme energy density functional and relativistic covariant density functional,respectively.The temporal evolution and phase-space distributions ofπ,K,Λ and ∑ as well as the mass and charge distributions of nuclear fragments and hypernuclear fragments are analyzed by the model in the reaction of antiproton on 58Ni at an incident momentum of 5 GeV/c.It is found that the phase-space distribu-tions of particles are similar with the two mean-field potentials,but different situation for the fragment distribution,in particu-lar for the intermediate mass fragments.The fluctuation effect of the collision system is more obvious under the relativistic mean field,which leads to the high debris yield.
LQMD transport modelantiproton induced nuclear reactionparticle productionrapidity distributionkinetic energy spectrum
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