Imprint of a nuclear bubble in nucleon-nucleus diffraction
Imprint of a nuclear bubble in nucleon-nucleus diffraction
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DOI：
10.1103/physrevc.102.034619
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发表时间：
2020-09
影响因子：
3.1
通讯作者：
V. Choudhary;W. Horiuchi;M. Kimura;R. Chatterjee
中科院分区：
文献类型：
--
作者：
V. Choudhary;W. Horiuchi;M. Kimura;R. Chatterjee
Background: The density of most nuclei is constant in the central region and is smoothly decreasing at the surface. A depletion in the central part of the nuclear density can have nuclear structure effects leading to the formation of ``bubble'' nuclei. However, probing the density profile of the nuclear interior is, in general, very challenging.Purpose: The aim of this paper is to investigate the nuclear bubble structure, with nucleon-nucleus scattering, and quantify the effect that the bubble structure has on the nuclear surface profile.Method: We employed high-energy nucleon-nucleus scattering, using the Glauber model to analyze various reaction observables, which helps in quantifying the nuclear bubble. The effectiveness of this method is tested on $^{28}\mathrm{Si}$ with harmonic-oscillator (HO) densities, before applying it on even-even $N=14$ isotones, in the $22\ensuremath{\le}A\ensuremath{\le}34$ mass range, with realistic densities obtained from antisymmetrized molecular dynamics (AMD).Results: Elastic scattering differential cross sections and reaction probability for the proton-$^{28}\mathrm{Si}$ reaction are calculated using the HO density to design tests for signatures of the nuclear bubble structure. We then quantify the degree of bubble structure for $N=14$ isotones with the AMD densities by analyzing their elastic scattering at 325, 550, and 800 MeV incident energies. The present analyses suggest $^{22}\mathrm{O}$ as the most measurable candidate for a bubble nucleus, among even-even $N=14$ isotones, in the $22\ensuremath{\le}A\ensuremath{\le}34$ mass range.Conclusion: We have shown that the bubble structure information is imprinted on the nucleon-nucleus elastic scattering differential cross section, especially in the first diffraction peak. Bubble nuclei tend to have a sharper nuclear surface and deformation seems to be a hindrance in their emergence.
