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The Theory of the Dynamics of Hadronic and Muonic Atoms

强子和μ子原子动力学理论

基本信息

批准号：
12640399
负责人：
SHIMAMURA Isao
金额：
$ 2.18万
依托单位：
RIKEN (The Institute of Physical and Chemical Research)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640399/
关键词：
exotic atoms anti protonic atoms muon-catalyzed fusion muonic atoms anti matter positron scattering positronium 異常長寿命反陽子原子ポジトロン消滅しきい則

项目摘要

1.The effects of a strong laser field on the formation rate of antihydrogen in low-energy collisions between positronium with antiproton have been studied. The rate has been found to increase if the parameters for the laser field (e.g., intensity, frequency ; polarization) are appropriately chosen.2.A simple diabatic-ionization model has been established to obtain the cross section for exotic atom formation approximately. It reproduces accurate quantum mechanical results for simple systems very well, and also makes it possible to obtain information on complex systems for which accurate calculations are impossible.3.Extraordinarily long-lived exotic atoms were found experimentally only for helium, but the existence of and the possibility of the formation of long-lived exotic lithium and other exotic alkali atoms have been predicted theoretically.4.Muon transfer from hydrogenlike muonic atoms to proton isotopes has been treated quantum mechanically in terms of the hyperspherical-coordinate coupled-channel (HSCC) equations to obtain extremely accurate cross sections.5.Electron-positron pair annihilation in collisions of positrons with atoms and molecules has been studied by an entirely new theory using a complex potential. This leads to a threshold behavior that is very different from the well-known Wigner threshold law, and to newly found interference effects between direct and indirect annihilation processes.6.Some particularly broad resonances in positron scattering by the helium ion predicted in the literature have been denied definitively by the accurate HSCC calculations and a new theoretical method for resonance analysis.7.Photon-impact electron detachment from the positronium negative ions has been studied accurately by using the HSCC method. Rich resonance structure in the cross sections has been found.

1.研究了强激光场对正电子偶素与反质子低能碰撞中反氢生成速率的影响。已经发现如果激光场的参数（例如，强度、频率; 2.建立了一个简单的非绝热电离模型，近似地得到了奇异原子形成的截面。它很好地再现了简单系统的精确量子力学结果，也使得获得不可能精确计算的复杂系统的信息成为可能。但长期存在和形成的可能性，从理论上预测了锂原子和其他碱金属原子的迁移。4.从类氢μ子原子到质子同位素的μ子迁移已经用量子力学的方法处理，5.利用复势的全新理论研究了正电子与原子和分子碰撞中的电子-正电子对湮灭。这导致了与众所周知的维格纳阈值定律非常不同的阈值行为，6.精确的HSCC计算和共振分析的新理论方法明确地否定了文献中预言的正电子与氦离子散射中某些特别宽的共振。7.光子与氦离子的相互作用用HSCC方法精确地研究了电子偶素负离子的碰撞电子脱离。在截面上发现了丰富的共振结构。