【摘要】：中能重離子碰撞中產(chǎn)生的π介子是研究高密核物質(zhì)狀態(tài)方程一個重要的探針.而影響π介子在核介質(zhì)中輸運的π介子與核子相互作用勢(πN勢)目前還沒有完全確定.在最近更新的極端相對論量子分子動力學(xué)(UrQMD)模型中加入一種經(jīng)驗的πN勢,研究了它對π+和π-介子集體流的影響.通過與FOPI合作組實驗數(shù)據(jù)的比較發(fā)現(xiàn),考慮一個較弱的πN勢可以同時半定量地解釋直接流和橢圓流隨快度及橫向速度的變化情況,而考慮強的πN勢或者不考慮πN勢給出的結(jié)果都與實驗數(shù)據(jù)有很大差異.
[Abstract]:The 蟺 meson produced in heavy ion collisions is an important probe for studying the equation of state of high density nuclear matter. However, the interaction potential between 蟺 meson and nucleon (蟺 N potential), which affects the transport of 蟺 mesons in nuclear media, has not been completely determined. An empirical 蟺 N potential is added to the recently updated (UrQMD) model of extreme relativistic quantum molecular dynamics, and its effect on 蟺 and 蟺 -meson collective flow is studied. By comparing with the experimental data of FOPI cooperative group, it is found that considering a weaker 蟺 N potential, the variation of direct flow and elliptical flow with speed and transverse velocity can be explained semi-quantitatively simultaneously. The results obtained by considering the strong 蟺 N potential or not considering the 蟺 N potential are very different from the experimental data.
【作者單位】： 沈陽師范大學(xué)物理科學(xué)與技術(shù)學(xué)院;湖州師范學(xué)院理學(xué)院;中國科學(xué)院上海應(yīng)用物理研究所;中國科學(xué)院近代物理研究所;
【基金】：國家自然科學(xué)基金(編號:11375062,11505057,11647306,11605270) 浙江省教育廳一般科研項目(編號:Y201533176) 中國博士后科學(xué)基金(編號:2016M591730)資助
【分類號】：O571.6

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