# Difference between revisions of "Doppler Broadening"

## Photon emmision along direction of fission fragment velocit

= amount of energy the gamma ray was shifted by

where is the Doppler-shifted -ray energy which was measured

=- for an excited fragment in det-1
=- for an excited fragment in det-2

is the polar emission angle of excited fragment and the fragment velocity

=0.04634

Our Calculations

For example for energy E=2617 keV and the fragment velocity v= cm/s(speed of light c=3x cm/s, =0.033, =0.999455352)
We obtained the following results for different angles between the direction of the fission fragment propagation and the direction of the gamma emission

(i) =

=2532.02 keV

(ii) =

=2618.43 keV

(iii) =

=2704.83 keV

FWHM(for energy 2617 keV)=2.5 keV(experimental data)

Energy difference -=172.8 keV. This result shows us that we do not have Doppler Shift.

# Cf-252 Fission

The table below from http://www-aix.gsi.de/~wolle/ identifies gamma energies (in keV) for several fission fragments of Cf-252.

# Details of Cf-252 Source

The manufacturers description of the source File:CF-252-Description.pdf
Gamma and Neutron activity curvesFile:CF-252-gamma-n-activitycurves.pdf