Difference between revisions of "Doppler Broadening"

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<math>cos\theta_{photoni}</math>=-<math>cos\theta_{i}</math> for an excited fragment in det-1= angle between momentum of fragment <math>i</math> and the emitted photon<br>
+
<math>cos\theta_{photon1}</math>=-<math>cos\theta_{i}</math> for an excited fragment in det-1= angle between momentum of fragment <math>i</math> and the emitted photon<br>
 
<math>cos\theta_{photon2}</math>=-<math>cos\theta_{2}</math> for an excited fragment in det-2<br>
 
<math>cos\theta_{photon2}</math>=-<math>cos\theta_{2}</math> for an excited fragment in det-2<br>
  
  
 
<math>\theta_i</math> is the polar emission angle of excited fragment and <math>\beta_i</math> the fragment velocity<br>
 
<math>\theta_i</math> is the polar emission angle of excited fragment and <math>\beta_i</math> the fragment velocity<br>
 +
 +
<math>sqrt{E_i[MeV]}</math>
  
 
== Photon emission off fission fragment velocity axis==
 
== Photon emission off fission fragment velocity axis==

Revision as of 04:08, 24 June 2007

Theory of Dopler Broadening

Photon emmision along direction of fission fragment velocit

[math]E_{shift} = E_{photon} \frac{1-\beta \cos(\theta_{photon}^i)}{\sqrt{1-\beta_i^2}}[/math] = amount of energy the gamma ray was shifted by

where [math]E_{photon}[/math] is the Doppler-shifted [math]\gamma[/math]-ray energy which was measured


[math]cos\theta_{photon1}[/math]=-[math]cos\theta_{i}[/math] for an excited fragment in det-1= angle between momentum of fragment [math]i[/math] and the emitted photon
[math]cos\theta_{photon2}[/math]=-[math]cos\theta_{2}[/math] for an excited fragment in det-2


[math]\theta_i[/math] is the polar emission angle of excited fragment and [math]\beta_i[/math] the fragment velocity

[math]sqrt{E_i[MeV]}[/math]

Photon emission off fission fragment velocity axis

Cf-252 Fission

Photon Spectra from Cf-252

Measurements in the Beam test lab with HpGe and BC408

June 15,2007 Cf-252 measurements with HpGe & neutron sensitive scintillators in coincidence
June 19,2007 Cf-252 measurements with HpGe & neutron sensitive scintillators in coincidence
June 19,2007 Cf-252 measurements of gamma-spectrum using HpGe ungated