Cutting in a matrix

 

A gg-matrix is a twodimensional object which contents are coincident data from an experiment. To examine coincident data you can cut out a slice of the matrix which gives you a cut spectrum. To actually create a cut spectrum (see chapter 5 p. ) you must define a cut gate using the hotkey c. Similar to the definition of the fit-region you define the left and right border of the cut gate by pressing c once for each border. Further gates defined with c are automatically interpreted as background gates. If you want additional cut gates, use the hotkey GG to define them. Pressing C performs the cut and the cut-spectrum will be displayed in the window. You can delete your cut and background gates by pressing -C.

A gate will then be marked in your projection as shown in figure 2.4 on page .

  

Figure 2.4: Cut gate in the projection of a $220$Th spectrum. The peak at channel 671 is marked to find its coincident transitions. The spectrum at the bottom is the cut spectrum for channel 671 which has less statistic. Besides you can see that channel 671 is autocoincident.

With a view to greater clarity it is recommended to create the so called cut-window. It displays the projection and cut in one window. You can create it with the command:

tv$>$ window create cut testcut

Compare figure 2.4 on page and figure 2.5 on page to see the advantages of the cut-window.

 

Figure 2.5: The cut in its special window. In the upper right corner the projection is displayed.