Adiabatic formation of quasibound states of antihydrogen.
Adiabatic formation of quasibound states of antihydrogen.
复制标题
反氢准束缚态的绝热形成。
DOI：
10.1103/physreve.72.046406
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
C. Ordonez
中科院分区：
文献类型：
--
作者：
C. Correa;J. Correa;C. Ordonez
在三维空间中模拟了初始未束缚正电子在反质子电场和均匀磁场中的经典轨道。几个模拟运行纳入实验参数用于反氢的生产，这已经实现了由两个不同的小组[M。Amoretti，Nature（伦敦）419，456（2002）; G. Gabrielse，Phys. Rev. Lett. 89，213401（2002）]。模拟结果表明，反氢的临时束缚态可以在正能量下形成，其中当正电子和反质子无限分离时，系统的能量被定义为零。这种仅在磁场存在时形成的准束缚态通常小于垂直于磁场的维度。建立了形成截面的解析模型，发现准束缚态的形成频率高于稳定的里德堡态。
The classical trajectory of an initially unbound positron within the electric field of an antiproton and a uniform magnetic field is simulated in three dimensions. Several simulations are run incorporating experimental parameters used for antihydrogen production, which has been achieved by two different groups [M. Amoretti, Nature (London) 419, 456 (2002); G. Gabrielse, Phys. Rev. Lett. 89, 213401 (2002)]. The simulations indicate that temporary bound states of antihydrogen can form at positive energies, where the energy of the system is defined to be zero when the positron and antiproton are at rest with infinite separation. Such quasibound states, which form only when the magnetic field is present, are typically smaller than in a dimension perpendicular to the magnetic field. An analytical model is developed for a formation cross section, and it is found that quasibound states may form more frequently than stable Rydberg states.