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arXiv 1409.0735nucl-exnucl-th
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费米能域中核物质的介质内效应

In-medium effects for nuclear matter in the Fermi energy domain

O. Lopez, D. Durand, G. Lehaut, B. Borderie, M. F. Rivet, R. Bougault, E. Galichet, D. Guinet, N. Le Neindre, P. Marini, P. Napolitani, M. Pârlog, E. Rosato, G.… 展开作者

O. Lopez, D. Durand, G. Lehaut, B. Borderie, M. F. Rivet, R. Bougault, E. Galichet, D. Guinet, N. Le Neindre, P. Marini, P. Napolitani, M. Pârlog, E. Rosato, G. Spadaccini, E. Vient, M. Vigilante

备注：
9 pages, 10 figures, submitted to PRC
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摘要：

本文研究了在费米能域中重离子诱导反应的中心碰撞中的核阻止，即$15$和$100$ A\，\textrm{MeV} .使用由$4π$阵列\emph{INDRA}提供的独家测量的大数据集，我们确定作为系统质量和轰击能量的函数的相对停止程度。我们表明，停止可以直接相关的核介质中的输运性质。通过特别关注自由核子（这里是质子），我们第一次提出了一个全面的实验结果的平均自由程，核子-核子截面和介质中的影响，在核物质。结果表明，平均自由程在$λ_{NN}=9.5 \pm 2$ \textrm{fm}处，在$E_{inc}=35-40$ A\，\textrm{MeV}入射能量附近有一个最大值，并在$E_{inc} = 100$ A\，\textrm{MeV}处向一个渐近值$λ_{NN}= 4.5 \pm 1$ \textrm{fm}减小.在考虑了弹性核子-核子碰撞的泡利阻塞后，计算结果表明，在此能量范围内，介质内有效\emph{NN}截面比自由截面进一步减小.因此，在费米能级范围内，介质内效应是不可忽略的。这些结果带来了新的基本输入微观描述的费米能域的核反应。

英文摘要：

We study nuclear stopping in central collisions for heavy-ion induced reactions in the Fermi energy domain, between $15$ and $100$ A\,\textrm{MeV}. Using the large dataset of exclusive measurements provided by the $4π$ array \emph{INDRA}, we determine the relative degree of stopping as a function of system mass and bombarding energy. We show that the stopping can be directly related to the transport properties in the nuclear medium. By looking specifically at free nucleons (here protons), we present for the first time a comprehensive body of experimental results concerning the mean free path, the nucleon-nucleon cross-section and in-medium effects in nuclear matter. It is shown that the mean free path exhibits a maximum at $λ_{NN}=9.5 \pm 2$ \textrm{fm}, around $E_{inc}=35-40$ A\,\textrm{MeV} incident energy and decreases toward an asymptotic value $λ_{NN}= 4.5 \pm 1$ \textrm{fm} at $E_{inc} = 100$ A\,\textrm{MeV}. After accounting for Pauli blocking of elastic nucleon-nucleon collisions, it is shown that the effective in-medium \emph{NN} cross section is further reduced compared to the free value in this energy range. Therefore, in-medium effects cannot be neglected in the Fermi energy range. These results bring new fundamental inputs for microscopic descriptions of nuclear reactions in the Fermi energy domain.

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