M K SRIVASTAVA* and KSHAMATA MUKTAVAT

Department of Physics, Indian Institute of Technology, Roorkee 247 667, India
* Present address: S.I.E.T., Dulehra Marg, Modipuram, Meerut 250 110, India
Email: mksrafph@rurkiu.ernet.in; muktadph@rurkiu.ernet.in

 Abstract.

The angular variations of the five-fold differential cross section obtained by using different wave functions of helium are compared with experimental data. It is found that in the coplanar geometry two kinematical arrangements, (i) equal energy sharing between the two ejected electrons with one of  them ejected along the momentum transfer direction and the other along varying direction and (ii) the Bethe ridge condition with fixed sum of ejected electron energies and varying angle between them, are very sensitive to e--e correlations contained in the target wave function. This  comparison has been used to show that open-shell class of wave functions better incorporate e--e correlations than the closed-shell class.

Keywords:  Electron--electron correlation; differential cross section.

Pacs Nos.  34.50.Fa; 34.80.Dp