Experimental set-up

double ionization chamber

 
Figure 1: Inner setup of the double ionization chamber. The thin source was mounted in the hole in the center of the cathode.

anodes energies of fission fragments

momentum conservation:

Cf-source:

 
Figure 2: Energy of anode-1 versus energy of anode-2 measured with the double ionization chamber.

 
Figure 3: Energy versus mass number (top), fragment mass distribution (bottom).

Emission Angle of Fragments

drift-time of anode polar angle

drift-time mesurement: start with central cathode signal, stop with anode signal

 
Figure 4: Determination of the polar angle from the measured drift-time.

polar angle of fragments:

 
Figure 5: versus distribution determined with the double ionization chamber.

Emission Angle of Fragments

energy signal of cathode sections azimuthal angle

energy signals of the four sectors depend on the orientaion of the fission axis

 
Figure 6: Determination of the azimuthal angle from the cathode signals.

determination of energy ratios

azimuthal angle of fragments:

Energy Ratios for Different Emission Angles

 
Figure 7: Energy ratios versus determined from the cathode signals for emission angles .

• About this document ...