Also das ist eine sehr gute Arbeit von Professor Parodi

09/02/2013 - 05:05 von D Orbital | Report spam
The negative positronium ion Ps- is a fundamental leptonic three-body system (e+e-e-) and as such purely described by QED to a very good approximation. Fig. 1 displays a sketch of the Ps-Minus ion and its allowed decay channels and the repsective branching ratios.




The most recent and first relativistic calculation [1] leads to a decay rate of Gamma = 2.087963(12) ns-1. With a calculated binding energy of -0.326 eV only the ground state ist stable against dissociation. It decays via e+e- annihilation in any photon number, with a greatly favoured 2 gamma decay channel. Only two decay rate measurements are available, with the most recent value [2] of Gamma = 2.089(15) ns-1. In order to exploit the unprecedented positron intensity of the worldwide strongest positron source NEPOMUC at the Garching neutron source FRM-II, the experimental setup for the Ps- experiment, developed at the Max- Planck-Institut f. Kernphysik in Heidelberg, was transferred to the NEPOMUC positron beam line in Garching [3]. The schematic setup of the experiment is shown in Fig. 2.
 

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#1 D Orbital
09/02/2013 - 20:07 | Warnen spam
Am Samstag, 9. Februar 2013 05:05:57 UTC+1 schrieb D Orbital:
The negative positronium ion Ps- is a fundamental leptonic three-body system (e+e-e-) and as such purely described by QED to a very good approximation. Fig. 1 displays a sketch of the Ps-Minus ion and its allowed decay channels and the repsective branching ratios.









The most recent and first relativistic calculation [1] leads to a decay rate of Gamma = 2.087963(12) ns-1. With a calculated binding energy of -0.326 eV only the ground state ist stable against dissociation. It decays via e+e- annihilation in any photon number, with a greatly favoured 2 gamma decay channel. Only two decay rate measurements are available, with the most recent value [2] of Gamma = 2.089(15) ns-1. In order to exploit the unprecedented positron intensity of the worldwide strongest positron source NEPOMUC at the Garching neutron source FRM-II, the experimental setup for the Ps- experiment, developed at the Max- Planck-Institut f. Kernphysik in Heidelberg, was transferred to the NEPOMUC positron beam line in Garching [3]. The schematic setup of the experiment is shown in Fig. 2.



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Der Zerfall 1 Gamma, 2 Gamma und 3 Gamma war mir selber neu.

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