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physics.atom-ph2002
A new ab initio method of calculating and positron annihilation rates using coupled-channel T-matrix amplitudes
P K Biswas
A new {\it ab initio} theoretical formulation to calculate and hence the positron annihilation rates is presented using the on-shell and half-offshell T-matrix scattering…
physics.atom-ph2001
Scattering of positronium from singly ionized helium and appearing resonances
P K Biswas, H. M. Gupta
The coupled-channel model [Phys. Rev. A {\bf 59}, 363 (1999)] that yields converged low-energy phase shifts, and exact binding and resonance features in Ps-H [Phys. Rev. A {\bf 59}…