Skip to Main Content

The University of Tennessee

Department of Physics and Astronomy

Frequently Used Tools:


Periodic table morph

This movie begins with the Periodic Table of the Elements and transforms it into the Chart of the Nuclides. It can be used to explain the relationship between the Periodic Table and the Chart of the Nuclides and conveys the vast number of radioactive nuclei that are available for experimental study. Each element is broken off the Periodic Table and its individual stable isotopes are displayed. Next, the known radioactive elements are displayed according to their decay mode and the last step displays the predicted radioactive nuclei.

Valley of Beta Stability

The mass excess of a nucleus describes the relative binding energy difference between the nucleus and its constituent protons and neutrons. For a given mass number (isobars) the smaller the mass excess the more stable the nucelus with respect to beta decay. Plotting the mass excess for a given isobaric chain reveals a parabola in which the stable nuclei occur at the minimum. Shown here is the mass excess for each isotope relative to the minimum mass excess in its mass chain. The views are (from middle top counter clockwise), a 2D view of the entire chart of nuclides, the entire chart of nuclides showing the steep sides of the valley of beta stability, a 2D view zoomed in between mass 40 and 80 nuclei, same region with a view down the middle of the valley of stability.




Ion-decay correlation

This movie describes the concept of correlating an implanted ion with its subsequent decay. First the radioactive ion (red sphere) is implanted into a certain pixel of a Double-sided Silicon Strip Detector (DSSD, silver square). After some time has passed the ion decays (turns green) and emits a particle (blue sphere) and a gamma ray. Both the recoiling daughter nucleus and the emitted particle are stopped in the same pixel of the DSSD (for illustration the recoil of the nucleus has been grossly exaggerated). Based on both the position information obtained from the pixels of the DSSD and the time between the ion implantation into the DSSD and the ion decay the correlated with each other. The passage of time is indicated by the yellow circle in the lower right of the animation.





Charge collection inside a DSSD

This is a schematic description of the charge collection inside one pixel of a DSSD. The front and back strips of the DSSD are represented by the extended yellow lines. The intersection of these strips defines a pixel in the DSSD. In the animation you will see a particle start in the lower left corner of the DSSD and travel to the upper right. Along its path electron(green)/hole(blue) pairs are created in the material. These charge carriers are swept to their respective sides of the DSSD due to the electric field. Electrons are swept to the left and holes are swept to the right. The mobility of the electroncs is higher than that of the holes and are thus collected quicker.