Positron production

Positron production occurs for nuclides that are below the zone of stability (those nuclides whose neutron/proton ratios are too small). The net effect of positron emission is to change a proton to a neutron. An example of positron emission would be... 

B) A positron, "e, is a particle with the same mass as an electron but with the opposite charge. The net effect of positron production is to change a proton into a neutron. 

I., Yamamoto, Y., Oshima, N. and Ito, Y. (1995). Slow positron production using the RIKEN AVF cyclotron. Applied Surface Science 85 165-171. 

Fig. 1 Target and moderator setup for slow positron production at the Mainz Linear Accelerator...

Te 5.10 alpha particles and 5 beta particles 7. Refer to Table 21.2 for potential radioactive decay processes. 17F and, 8F contain too many protons or too few neutrons. Electron capture or positron production are both possible decay mechanisms that increase the neu-tron-to-proton ratio. Alpha-particle production also increases the neu-tron-to-proton ratio, but it is not likely for these light nuclei. 21F contains too many neutrons or too few protons. Beta-particle production lowers the neutron-to-proton ratio, so we expect 21F to be a /3-emitter. 9. a. 2gCf + gO - fcIJSg + 4jn b. Rf 11. 6.35 X 1011 13. a. 

Positron production Electron capture Decay series... 

The positron is a particle with the same mass as the electron but opposite charge. An example of a nuclide that decays by positron production is sodium-22. 

Positron production Electron capture Decay series Nuclear transformation Transuranium elements Geiger-Miiller counter Scintillation counter Half-life... 

The time-dependence of the energy levels in a supercritical heavy-ion collision is depicted in Figure 8.33. An electron (or hole) which was in a certain molecular eigenstate at the beginning of the collision can be transfered with a certain probability into different states by the dynamics of the collision. This can lead to the hole production in an inner shell by excitation of an electron to a higher state and/or hole production by ionization of an electron to the continuum. Further possibilities are induced positron production by excitation of an electron from the lower continuum to an empty bound level and direct pair production [59]. 

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