arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1407.7625nucl-thnucl-ex
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用$^3$ H/ $^3$ He比值探测亚饱和密度核对称能

$^3$H/$^3$He ratio as a probe of the nuclear symmetry energy at sub-saturation densities

Yongjia Wang, Chenchen Guo, Qingfeng Li, Hongfei Zhang

摘要:

在引入Skyrme势能-密度泛函的超相对论量子分子动力学(UrQMD)模型的最新版本中,计算了从中心$^3$ Ca+ $^{40}$ Ca,$^{96}$ Zr+ $^{96}$ Zr,$^{96}$ Ru + $^{96}$ Ru,研究了能量为0.12 ~ 1GeV $/$核子的$^{197}$ Au+ $^{197}$ Au碰撞.最近的FOPI数据的$^3$ H $/$ $^3$他的比率进行了比较与UrQMD计算使用13 Skyrme相互作用(所有表现出类似的值的等标量不可压缩性,但非常不同的密度依赖性的对称能)。发现在亚饱和密度下,$^3$ H $/$ $^3$ He比对核对称能敏感.适度软到线性对称能量的模型计算与实验FOPI数据一致。这一结果与最近文献中对低密度对称能的限制和我们以前用自由核子和氢同位素椭圆流作为灵敏探针获得的高密度对称能的结果是一致的。

英文摘要:

Within the newly updated version of the Ultra-relativistic quantum molecular dynamics (UrQMD) model in which the Skyrme potential energy-density functional is introduced, the yield ratio between $^3$H and $^3$He clusters emitted from central $^{40}$Ca+$^{40}$Ca, $^{96}$Zr+$^{96}$Zr, $^{96}$Ru+$^{96}$Ru, and $^{197}$Au+$^{197}$Au collisions in the beam energy range from 0.12 to 1 GeV$/$nucleon is studied. The recent FOPI data for the $^3$H$/$$^3$He ratio are compared with UrQMD calculations using 13 Skyrme interactions (all exhibiting similar values of iso-scalar incompressibility but very different density dependences of the symmetry energy). It is found that the $^3$H$/$$^3$He ratio is sensitive to the nuclear symmetry energy at sub-saturation densities. Model calculations with moderately soft to linear symmetry energies are in agreement with the experimental FOPI data. This result is in line with both, the recent constraints on the low-density symmetry energy available in the literature and our previous results for the high-density symmetry energy obtained with the elliptic flow of free nucleons and hydrogen isotopes as a sensitive probe.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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