原子核物理评论
原子覈物理評論
원자핵물리평론
Nuclear Physics Review
2014年
2期
135-141
,共7页
集体流%核子数标度%中能%重离子碰撞%同位旋相关的量子分子动力学模型
集體流%覈子數標度%中能%重離子踫撞%同位鏇相關的量子分子動力學模型
집체류%핵자수표도%중능%중리자팽당%동위선상관적양자분자동역학모형
collective flow%nucleon-number scaling%intermediate energy%heavy ion collision%IQMD model
利用同位旋相关的量子分子动力学模型模拟了40Ca+40Ca,50Ca+40Ca,64Cu+64Cu和197Au+197 Au等多个碰撞系统中快度轻碎片集体流标度的性质。发现,中能区不同碰撞系统横向动量相关的椭圆流存在对碎片核子数的标度,且存在v4/v22标度,对不同碎片该比值都近似为常数0.5。同时探讨了碰撞能量、碰撞参数、核状态方程对标度律的影响,发现这些标度行为不敏感于以上物理量,可能是核碎片形成机制(组合机制)的必然结果。
利用同位鏇相關的量子分子動力學模型模擬瞭40Ca+40Ca,50Ca+40Ca,64Cu+64Cu和197Au+197 Au等多箇踫撞繫統中快度輕碎片集體流標度的性質。髮現,中能區不同踫撞繫統橫嚮動量相關的橢圓流存在對碎片覈子數的標度,且存在v4/v22標度,對不同碎片該比值都近似為常數0.5。同時探討瞭踫撞能量、踫撞參數、覈狀態方程對標度律的影響,髮現這些標度行為不敏感于以上物理量,可能是覈碎片形成機製(組閤機製)的必然結果。
이용동위선상관적양자분자동역학모형모의료40Ca+40Ca,50Ca+40Ca,64Cu+64Cu화197Au+197 Au등다개팽당계통중쾌도경쇄편집체류표도적성질。발현,중능구불동팽당계통횡향동량상관적타원류존재대쇄편핵자수적표도,차존재v4/v22표도,대불동쇄편해비치도근사위상수0.5。동시탐토료팽당능량、팽당삼수、핵상태방정대표도률적영향,발현저사표도행위불민감우이상물리량,가능시핵쇄편형성궤제(조합궤제)적필연결과。
The properties of light particles’ collective flows from 40Ca+40Ca, 50Ca+40Ca, 64Cu+64Cu and 197Au+197Au systems are simulated by Isospin-dependent Quantum Molecular Dynamics model. Transverse momentum dependent elliptic flows from different systems are found to be scaled by nucleon numbers of fragment in intermediate energy, and v4/v22 scaling is also found and nearly to be a constant 0.5 for different light fragments. These scaling behaviors are investigated for different collision energies, impact parameters, nuclear equation of states and found insensitive to the above physical quantities, which may be the result of coalescence mechanism that describes the formation of fragments.