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相关概念视频

Nuclear Transmutation03:20

Nuclear Transmutation

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Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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Nuclear Stability03:18

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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
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The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Setting Limits on Supersymmetry Using Simplified Models
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探测奇异性哈德龙化与事件逐事件生产的多奇异性哈德龙.

S Acharya1, D Adamová2, A Agarwal3

  • 1Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France.

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概括

这项研究测量了不同类型的碰撞中多异域子和子的波动. 统计哈德罗尼化模型准确地预测了这些波动,与字符串碎片化模型不同.

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科学领域:

  • 高能核物理 高能核物理
  • 粒子物理学的粒子物理学.
  • 量子色态动力学 是一个量子色态动力学.

背景情况:

  • 了解高能碰撞中的粒子生成机制至关重要.
  • 多个奇异的子和子是重离子碰撞中产生的热和密集介质的敏感探测器.
  • 每次事件的波动为粒子生产的早期阶段提供了洞察力.

研究的目的:

  • 介绍第一个对净X^{-} 和X[over ̄]^{+} 子数的事件对事件波动的测量.
  • 为了研究这些波动与净卡昂数之间的相关性.
  • 测试不同理论模型在描述这些现象时的有效性.

主要方法:

  • 来自质子对质子 (pp),质子对 (p-Pb) 和对 (Pb-Pb) 碰撞的数据分析.
  • 由ALICE协作团进行的测量,质量中心能量为每核子对5.02 TeV.
  • 实验结果与统计哈德龙化模型和字符串碎片化模型的预测进行比较.

主要成果:

  • 该研究报告了净 Ξ^{-} 和 Ξ[over ̄]^{+} 波动的首次测量及其与净kaon数的相关性.
  • 统计的哈德龙化模型,结合了同等和相反奇异性的哈德龙之间的三个速度单位之间的相关性,成功地描述了数据.
  • 字符串碎片模型,主要是在有限的速度范围内将奇异哈德龙与相反的奇异夸克含量相关联,无法再现实验观测结果.

结论:

  • 这些发现支持统计哈德龙化模型作为描述粒子生成的合适框架,包括多异域哈德龙和卡昂.
  • 结果强调了考虑在扩大速度范围内的相关性以及具有相似奇异度含量的哈德龙之间的相关性的重要性.
  • 字符串碎片模型的失败表明,它们在捕捉这些碰撞中奇异性生产的复杂相互作用的能力受到限制.