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arXiv 2202.01549nucl-exastro-ph.GAhep-ex
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测量$^{3}\overline{\rm He}$核在物质中的吸收及其对它们在星系中传播的影响

Measurement of of $^{3}\overline{\rm He}$ nuclei absorption in matter and impact on their propagation in the galaxy

ALICE Collaboration

备注：
27 pages, 5 captioned figures, authors from page 22, published version, figures at http://alice-publications.web.cern.ch/node/7639
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摘要：

在我们的银河系中，由反质子和反中子组成的轻反核可以通过高能宇宙射线与星际介质的碰撞产生，也可以来自尚未发现的暗物质粒子的湮灭。在地球上，要高精度地制造和研究反核，唯一的方法就是在高能粒子加速器中制造它们。虽然基本反粒子的性质已被详细研究，但关于轻反核与物质相互作用的知识仍然有限。我们确定了$^{3}\overline{\rm He}$在大型强子对撞机的ALICE探测器中遇到物质粒子并湮灭或解体时的消失概率。我们提取的非弹性相互作用的横截面，然后用作输入到计算的透明度，我们的银河系传播的$^{3}\overline{\rm He}$源于暗物质湮灭和宇宙射线相互作用内的星际介质。对于一个特定的暗物质配置文件，我们估计的透明度约为50%，而随着增加$^{3}\overline{\rm He}$动量从25%到90%的宇宙射线源。结果表明，$^{3}\overline{\rm He}$核可以在银河系中长距离运动，可以用来研究宇宙射线相互作用和暗物质湮灭。

英文摘要：

In our Galaxy, light antinuclei composed of antiprotons and antineutrons can be produced through high-energy cosmic-ray collisions with the interstellar medium or could also originate from the annihilation of dark-matter particles that have not yet been discovered. On Earth, the only way to produce and study antinuclei with high precision is to create them at high-energy particle accelerators. Although the properties of elementary antiparticles have been studied in detail, the knowledge of the interaction of light antinuclei with matter is limited. We determine the disappearance probability of $^{3}\overline{\rm He}$ when it encounters matter particles and annihilates or disintegrates within the ALICE detector at the Large Hadron Collider. We extract the inelastic interaction cross section, which is then used as input to calculations of the transparency of our Galaxy to the propagation of $^{3}\overline{\rm He}$ stemming from dark-matter annihilation and cosmic-ray interactions within the interstellar medium. For a specific dark-matter profile, we estimate a transparency of about 50%, whereas it varies with increasing $^{3}\overline{\rm He}$ momentum from 25% to 90% for cosmic-ray sources. The results indicate that $^{3}\overline{\rm He}$ nuclei can travel long distances in the Galaxy, and can be used to study cosmic-ray interactions and dark-matter annihilation.

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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