arXiv 2001.113512020-01nucl-thhep-phnucl-ex

相对论重离子碰撞中$^4{\rm Li}$和$p\!-\!^3{\rm He}$关联函数的产生

Production of $^4{\rm Li}$ and $p\!-\!^3{\rm He}$ correlation function in relativistic heavy-ion collisions

Sylwia Bazak, Stanislaw Mrowczynski

备注：: 16 pages, 10 figures, to appear in European Physical Journal A Topical Issue on "Light clusters in nuclei and nuclear matter: Nuclear structure and decay, heavy ion collisions, and astrophysics". arXiv admin note: substantial text overlap with arXiv:2004.07029
发表信息：: Eur. Phys. J. A 56, 193 (2020)
DOI：: 10.1140/epja/s10050-020-00198-6

摘要：

热力学模型和并合模型都很好地描述了LHC相对论重离子碰撞中产生的轻核产额。我们建议测量$^4{\rm Li}$的产率，并将其与$^4{\rm He}$的产率进行比较，以证伪其中一个模型。由于$^4{\rm He}$和$^4{\rm Li}$的质量几乎相等，在热模型中，由于两种核素的自旋态数不同，$^4{\rm Li}$的产额比$^4{\rm He}$的产额大5倍左右。然而，它们的内部结构却非常不同：α粒子是紧密结合的，而$^4{\rm Li}$是松散结合的。因此，在聚结模型中，$^4{\rm Li}$与$^4{\rm He}$的产率之比明显较小，并且强烈依赖于碰撞中心性。由于核素$^4{\rm Li}$不稳定，并且会衰变为$^3{\rm He}$和$p$，因此可以通过测量$p\!-\!^3{\rm He}$关联函数来实验获得$^4{\rm Li}$的产率。该函数不仅携带关于$^4{\rm Li}$产率的信息，而且还携带关于$^3{\rm He}$来源的信息，并允许通过来源大小测量来确定$^3{\rm He}$是直接从火球中发射还是在火球之后形成。我们计算的关联函数考虑到$s-$波散射和库仑排斥连同共振相互作用负责的$^4{\rm Li}$核素。我们讨论了如何从关联函数中推断出$^3{\rm He}$的起源信息，并提出了一种计算$^4{\rm Li}$产率的方法。

英文摘要：

The thermal and coalescence models both describe well yields of light nuclei produced in relativistic heavy-ion collisions at LHC. We propose to measure the yield of $^4{\rm Li}$ and compare it to that of $^4{\rm He}$ to falsify one of the models. Since the masses of $^4{\rm He}$ and $^4{\rm Li}$ are almost equal, the yield of $^4{\rm Li}$ is about 5 times bigger than that of $^4{\rm He}$ in the thermal model because of different numbers of spin states of the two nuclides. Their internal structures are, however, very different: the alpha particle is well bound and compact while $^4{\rm Li}$ is weakly bound and loose. Consequently, the ratio of yields of $^4{\rm Li}$ to $^4{\rm He}$ is significantly smaller in the coalescence model and it strongly depends on the collision centrality. Since the nuclide $^4{\rm Li}$ is unstable and it decays into $^3{\rm He}$ and $p$, the yield of $^4{\rm Li}$ can be experimentally obtained through a measurement of the $p\!-\!^3{\rm He}$ correlation function. The function carries information not only about the yield of $^4{\rm Li}$ but also about the source of $^3{\rm He}$ and allows one to determine through a source-size measurement whether of $^3{\rm He}$ is directly emitted from the fireball or it is formed afterwards. We compute the correlation function taking into account the $s-$wave scattering and Coulomb repulsion together with the resonance interaction responsible for the $^4{\rm Li}$ nuclide. We discuss how to infer information about an origin of $^3{\rm He}$ from the correlation function, and finally a method to obtain the yield of $^4{\rm Li}$ is proposed.

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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