Reaction dynamics of antiprotonic hydrogen formation in collisions between antiprotons and molecules

反质子与分子碰撞中反质子氢形成的反应动力学

• 批准号: 15540385
• 负责人: SAKIMOTO Kazuhiro
• 金额: $ 1.73万
• 依托单位: Japan Aerospace Exploration Agency
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15540385/
• 关键词: antiproton; antiprotonic hydrogen; antiprotonic atom; exotic atom; atomic and molecular physics; chemical reaction; antiproton capture; 反陽子水素原子; 反陽子ヘリウム原子; 反陽子・陽子消滅; 反水素原子; ヘリウムイオン; 共鳴散乱; 電離; 水素分子イオン; ミューオン; プロトニウム; 原子分子衝突; 断熱ポテンシャル曲面

Low-energy antiproton collisions with atomic or molecular ions was investigated using a wave-packet-propagation full-quantum-mechanical method or a quantum-classical hybrid (i.e., semiclassical) approximation. It is found that the adiabatic picture (i.e., Born-Oppenheinmer separation) is appropriate in a large sense.In the case of atomic ion targets, the antiproton capture is a typical non-adiabatic process because the electron must be emitted in this process, and hence occurs less frequently. However, even at very low energies, the capture probability is in fact small but finite still for large angular momenta. Correspondingly, the cross section for the non-adiabatic process diverges in the zero energy limit. This happens due to the peculiarity that the Coulomb force range is longer than the centrifugal one. Importance of a Rydberg series of resonances in the capture process is also 0found.In the case of molecular ion targets, the adiabatic condition is satisfied much better because t … More he electron can escape from the antiproton by forming a neutral atom or molecule. At the same the, the formation of aniti porotonic atoms becomes possible even in the adiabatic approximation. For the molecular ion targets, the antiprotonic atom formation can be treated as the collisions on a single adiabatic (Born-Oppenheimer) potential energy surface (PES), in the same manner as chemical reaction problems. The PES was caclculated for teh antiproton and hydrogen molecular ion system. A classicla trajectory Monte Carlo method was applied to the collision calculation. It is found that the dissociative dynamics plays a critical role in antiptotonic hydrogen (protonium) formation, the consequently the molecular target is much more effective in antiproton capture than the atomic target.I carried out the calculation also for collisions of hydrogen molecular ions with negative muons and kaons, and investigated the mass effect on the reaction dynamis. It is found that the antiproton capture has a remarkable mass dependence. This is clearly in contrast to the negligible mass dependence. This is clearly in contrast to the negligiblemass dependence of the antiproton capture by atom in which the non-adiabatic coupling plays a dominant role. Less

使用波包的全量子力学方法或量子 - 古典杂化（即半经典）近似值研究了与原子或分子离子的低能抗抗原碰撞。发现绝热图片（即，未脑的分离）在很大的意义上是合适的。在原子离子靶标的情况下，抗抗原子捕获是典型的非绝热过程，因为该过程必须在此过程中发射，因此发生的频率较低。但是，即使在非常低的能量下，捕获的概率实际上很小，但对于大角度动量仍然有限。相应地，非绝热工艺的横截面在零能量限制中差异。这是由于库仑力范围比离心机长的特殊性而发生的。在捕获过程中，Rydberg系列共振的重要性也是0基。在分子离子靶标的情况下，绝热条件得到了更好的满足，因为……更多的电子电子可以通过形成中性原子或分子来逃脱抗蛋白酶。同样，即使在绝热近似中，Aniti Polaronic原子的形成也可能是可能的。对于分子离子靶标，可以将抗体原子形成视为单个绝热（Born-Oppenheimer）势能表面（PES）上的碰撞，就像化学反应问题一样。将PES用于抗抗蛋白和氢分子离子系统。经典的轨迹蒙特卡洛法被应用于碰撞计算。发现解离动力学在抗抗氢（Protonium）形成中起着至关重要的作用，因此，分子靶标比原子靶标的分子靶标在抗蛋白酶捕获中更有效。I还对氢分子与负雄杆菌和kaons和Kaons和Kaons和Kaons和Kaons和Kaons和Kaons和Kaons和Kaons和Kaons和Kaons contection进行了量的计算进行了计算。发现抗蛋白酶捕获具有显着的质量依赖性。这显然与可忽略的质量依赖相反。这显然与原子捕获的抗蛋白子捕获的质量依赖性相反，在该抗蛋白子捕获的原子中，非绝热耦合起着主要作用。较少的

项目成果

K.Sakimoto: "Collinear study of protonium formation in collisions of antiprotons with hydrogen molecular ions"Nucl.Instr.and Meth.B. 214. 131-134 (2004)

K.Sakimoto：“反质子与氢分子离子碰撞中质子形成的共线研究”Nucl.Instr.and Meth.B。

Collinear study of protonium formation in collisions of antiprotons with hydrogen molecular ions

反质子与氢分子离子碰撞中质子形成的共线研究

• 发表时间: 2004
• 期刊: Nucl. Instr. and Meth. B 214
• 作者: K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto
• 通讯作者: K.Sakimoto

Chemical reaction of negative particles pbar, K-, and mu- with molecular ions

负粒子pbar、K-、mu-与分子离子的化学反应

• 发表时间: 2004
• 期刊: Chem.Phys.Letters 393
• 作者: K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto
• 通讯作者: K.Sakimoto

Ionization of hydrogen molecular ions by antiproton impacts

反质子撞击导致氢分子离子电离

• 发表时间: 2005
• 期刊: Phys. Rev. A 71
• 作者: K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto
• 通讯作者: K.Sakimoto

Full quantum-mechanical study of protonium formation in slow collisions of antiprotons with hydrogen atoms

反质子与氢原子缓慢碰撞中质子形成的完整量子力学研究

• 发表时间: 2004
• 期刊: Physica Scripta T110
• 作者: K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto;K.Sakimoto
• 通讯作者: K.Sakimoto