Variational calculation of positronium-helium-atom scattering length
نویسنده
چکیده
We present a variational basis-set calculational scheme for elastic scattering of positronium atom by helium atom in S wave and apply it to the calculation of the scattering length. Highly correlated trial functions with appropriate symmetry are used in this calculation. We report numerical result for the scattering length in atomic unit: (1.0 ± 0.1)a0. This corresponds to a zero-energy elastic cross section of (4.0 ± 0.8)πa0. PACS Number(s): 34.90.+q, 36.10.Dr
منابع مشابه
Electron exchange model potential: Application to positronium-helium scattering
The neutral Ps beam provides a great deal of advantage over charged projectiles as a probe to study the structure of atoms, molecules and surface. Recently, there have been a great deal of interest in positronium(Ps-) atom scattering due to the improvement of Ps sources and Ps beams. Total scattering cross section of ortho Ps, which has a larger lifetime than para Ps, have been measured for var...
متن کاملElastic positronium-atom scattering using the stochastic variational method.
The stochastic variational method is used in conjunction with stabilization ideas to compute the low energy phase shifts and scattering lengths for positronium-atom scattering. Results are obtained for the Ps-H, Ps- Li+, Ps-He, and Ps-Ps systems. The Ps-H scattering lengths are probably accurate to better than 5% and are the most accurate so far computed. The results for Ps- Li+ and Ps-Ps scatt...
متن کاملDifferential and partial cross sections of elastic and inelastic positronium-helium-atom scattering
Scattering of positronium (Ps) by helium atom has been investigated in a three-Ps-state coupled-channel model including Ps(1s,2s,2p) states using a recently proposed time-reversal-symmetric regularized electron-exchange model potential. Specifically, we report results of differential cross sections for elastic scattering and target-elastic Ps excitations. We also present results for total and d...
متن کاملVariational calculation of some S-states of Coulomb three-body systems
A generalized Hylleraas-type basis set with three nonlinear parameters is proposed to study three-body systems interacting via coulomb forces within the framework of non-relativistic quantum mechanics. This basis set improves the rate of convergence with respect to previous ones, specially for nonsymmetric systems and excited states of two electron atoms. Accurate binding energies and other pro...
متن کاملJa n 20 06 Calculation of ground - and excited - state energies of confined helium atom
We calculate the energies of ground and three low lying excited states of confined helium atom centered in an impenetrable spherical box. We perform the calculation by employing variational method with two-parameter variational forms for the correlated two-particle wave function. With just two variational parameters we get quite accurate results for both ground and excited state energies. PACS ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2001