近日，法国斯特拉斯堡大学的K. Lévêque-Simon与P.-A. Hervieux合作并取得一项新进展。经过不懈努力，他们探究了激光辅助的反质子-正电子素碰撞形成反氢的过程。相关研究成果已于2023年5月30日在国际学术期刊《物理评论A》上发表。

据悉，正电子素原子和反质子之间的三体碰撞形成反氢原子的过程在静止状态下的反氢重力行为（GBAR）实验中起着关键作用。然而，该实验面临一个重要挑战，即如何增加反氢的产量。目前，通过反应ˉp+Ps→ˉˉH+e^-生成反氢的速率非常低。因此，研究人员正致力于找到提高反氢产量的方法。

附：英文原文

Title: Antihydrogen formation from laser-assisted antiproton-positronium collisions

Author: K. Lévêque-Simon, P.-A. Hervieux

Issue&Volume: 2023/05/30

Abstract: The formation of antihydrogen atoms from three-body collisions between positronium atoms and antiprotons plays a crucial role in the gravitational behavior of antihydrogen at rest (GBAR) experiment devoted to the measure of the action of gravity on antimatter. One of the main challenges facing this experiment is to find the means for increasing the production of antihydrogens which are produced by the reaction ˉp+Ps→ˉˉH+e^- with an extremely low rate. Along these lines, we investigate here the possibility to influence the collision process by using a laser field. A perturbative approach combining the Coulomb-Born approximation for modeling the charged-particle collision and a first-order perturbation theory for describing laser-atom interactions is employed to estimate laser-mediated charge-exchange cross sections. By carefully considering the laser specifications compatible with the experimental constraints, we present an extensive study of the influence of the laser parameters (laser wavelength and intensity) on the cross sections in the energy range of interest for GBAR. We show that under special irradiation conditions the rate of antihydrogen production may be significantly increased by the presence of the laser field.

DOI: 10.1103/PhysRevA.107.052813

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.107.052813