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Hyperspherical partial wave approach has been applied here in the study ofdouble photoionization of the helium atom for equal energy sharing geometry at20 eV excess energy. Calculations have been done both in length and velocitygauges and are found to agree with each other, with the CCC results and withexperiments and exhibit some advantages of the corresponding three particlewave function over other wave functions in use.Comment: 11 pages, 1 figure, submitted to J. Phys B: At. Mol. Opt. Phys; v2 -  revised considerably, rewritten using ioplatex clas

Hyperspherical partial wave calculation for double photoionization of the helium atom at 20 eV excess energy