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arXiv 2009.01413nucl-th
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反质子-核散射在探测核表面密度分布中的应用

Utility of antiproton-nucleus scattering for probing nuclear surface density distributions

K. Makiguchi, W. Horiuchi, A. Kohama

摘要:

反质子-核子($\bar{p}N$)总截面在入射能量从几百MeV到几千MeV时通常比$NN$大3-4倍。我们研究了反质子-核散射,因为它可以作为原子核结构的探针,提供不同于质子探针的灵敏度。用Glauber模型合理地描述了高能反质子-核反应,该模型采用最小轮廓函数,再现了$\bar{p}N$和$\bar{p}$ - $^{12}$ C截面数据.与质子-核散射相比,由于大的$\bar{p}N$基元截面,完全吸收甚至发生在核半径之外,对尾区的核密度分布具有更强的敏感性.这种灵敏度是量化的总反应截面与各种密度分布的未来测量,包括富中子不稳定核。

英文摘要:

Antiproton-nucleon ($\bar{p}N$) total cross sections are typically 3-4 times larger than the $NN$ ones at incident energies from a few hundreds to thousands MeV. We investigate antiproton-nucleus scattering as it could work as a probe of the nuclear structure giving the sensitivity differently from a proton probe. High-energy antiproton-nucleus reactions are reasonably described by the Glauber model with a minimal profile function that reproduces the $\bar{p}N$ and $\bar{p}$-$^{12}$C cross section data. In contrast to the proton-nucleus scattering, we find that the complete absorption occurs even beyond the nuclear radius due to the large $\bar{p}N$ elementary cross sections, which shows stronger sensitivity to the nuclear density distribution in the tail region. This sensitivity is quantified in the total reaction cross sections with various density profiles for future measurement including neutron-rich unstable nuclei.

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