Interaction between antiprotonic helium ion and He atom: Potential Energy Surfaceстатья Электронная публикация

Дата последнего поиска статьи во внешних источниках: 25 апреля 2017 г.

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[1] Yudin S. N., Bodrenko I. V., Korenman G. Y. Interaction between antiprotonic helium ion and he atom: Potential energy surface // arXiv:nucl-th. — 2016. — no. 1612:03874. — P. 1–10. Potential Energy Surface for the ({{p}} - {He}{2+} - {He}) system is calculated in the framework of the restricted (singlet spin state) Hartree-Fock method with subsequent account of the electronic correlations within the second order perturbation method (MP2). The geometry of heavy particles is described in variables of distance r from nucleus a to antiproton, distance R from the center of mass of the ({p} - a) pair to {He} atom containing nucleus b, and an angle θ between {r} and {R}. The potential V(R,r,θ) of the interaction between {He} atom and a {p} - a subsystem involves a total energy of two electrons in the field of three heavy particles and Coulomb interactions of the b nucleus with antiproton and the a nucleus. The expansion of this potential in terms of Legendre polynomials {P}_k(θ) is obtained. Matrices of the multipole terms Vk(r,R) (k=0,1,2) are obtained in the basis of antiprotonic helium ion states. The results are compared with the model potential that was used earlier in the calculations of collisional Stark transitions of ({{p}He}{2+}) ion.

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