Four pi arrays

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(creation)
(Added notes on absolute efficiency and normalization to Rutherford)
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See the manual entries on OP,GDET and "Gamma Detector Solid Angle Attenuation Factors" for more information on these attenuation coefficients.
See the manual entries on OP,GDET and "Gamma Detector Solid Angle Attenuation Factors" for more information on these attenuation coefficients.
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The accuracy of this calculation depends on the uniformity of the array's acceptance over <math>\theta, \phi</math> polar and azimuthal angles.  For example, the largest gap in coverage in Gammasphere is near <math>\theta=0</math>, <math>\phi=0</math>.  If this non-uniformity does not have a significant influence on the accuracy, then the technique above using the angular attenuation coefficients can be used. 
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Approximately uniform gaps in the acceptance of the Ge array can be absorbed into the overall absolute efficiency of the array.  Since Gosia fits to ''relative'' <math>\gamma</math>-ray yield data, the absolute efficiency has no influence on the "typical" calculations.  (See the page on [[normalizing_to_the_rutherford_cross_section | normalizing to the Rutherford cross section]].  This technique requires special considerations.

Revision as of 12:31, 2 June 2011

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