Importance of momentum-dependent interactions for the extraction of the nuclear equation of state from high-energy heavy-ion collisions.
Importance of momentum-dependent interactions for the extraction of the nuclear equation of state from high-energy heavy-ion collisions.
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DOI：
10.1051/jphyscol:1987224
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发表时间：
1987-05
影响因子：
8.6
通讯作者：
J. Aichelin;A. Rosenhauer;G. Peilert;H. Stoecker;W. Greiner
中科院分区：
文献类型：
--
作者：
J. Aichelin;A. Rosenhauer;G. Peilert;H. Stoecker;W. Greiner
我们表明，动量相关的核相互作用（MDI）有很大的影响的动力学和高能重离子碰撞的观测值：π介子和K介子产量强烈抑制MDI。这种效应比硬局域势引起的抑制强得多。这给最近从π介子（和K介子）产额提取核状态方程引入了模糊性。此外，横向动量分布表现出强烈的依赖于MDI。另一方面，集体流角和氘质子比对MDI相当不敏感。因此，它们可能与高密度下的核状态方程直接相关。在重离子碰撞中对这些可观测量的相似测量可以为超新星坍缩和中子星星稳定性的感兴趣密度下的核状态方程提供线索。
We demonstrate that momentum dependent nuclear interactions (MDI) have a large effect on the dynamics and on the observables of high energy heavy ion collisions : Pion and kaon yields are strongly suppressed by MDI. This effect is much stronger than the supression due to a hard local potential. which introduces an ambiguity into the recent extraction of the nuclear equation of state from pion (and kaon) yields. Also the transverse rnomentum distributions exhibit a strong dependence on the MDI. The collective flow angles and the deuteron to proton ratios, on the other hand, are rather insensitive to the MDI. They may therefore be related directly to the nuclear equation of state at high density. Similtaneous measurements of these observables in heavy ion collisions can give clues on the nuclear equation of state at densities of interest for supernova collapse and neutron star stability.