JAPC - Fun with quantum numbers, matter and antimatter

Speaker: Dr. M.W.J. Bromley, Dept. of Physics, SDSU

Topic: "Fun with quantum numbers, matter and antimatter"

Time: 2:00 PM, Friday, March 16th, 2007

Place: P-148 (refreshments will be served at 1:45 PM in P146A)

Abstract: Calculations have demonstrated that 11 neutral atoms can bind positrons. In this talk i'll report on configuration interaction (CI) calculations that have demonstrated the existence of a ²P^o excited state of e⁺Ca, which consists predominantly of a positronium (Ps) cluster orbiting the Ca⁺ ion in the L=1 partial wave. This raises the possibility of detecting the formation of positronic bound states by an optical transition to the ground (²S^e) e⁺Ca state. The similar e⁺Mg system is shown to lack an equivalent excited state, however, it was used to introduce a new method of quantum scattering that extracts phase shifts from pseudostate energy shifts. These calculations showed that the e⁺Mg system has a low-energy p shape resonance. Finally, CI calculations of annihilation suppressed, unnatural parity ^2,4S^o, states of PsH, LiPs, NaPs and KPs are reported. The LiPs system being Borromean in nature.

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