Integrated yields

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(partial clean-up)
(more clean-up)
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Detected p-gamma coincident events  
Detected p-gamma coincident events  
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<math>N_i = 10^(-30) [Q / qe] [N_A / A] Y(I_i-->I_f) \epsilon_p \epsilon_\gamma \Delta \Omega_\gamma</math>
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<math>N_i = 10^{-30} [Q / qe] [N_A / A] Y(I_i-->I_f) \epsilon_p \epsilon_\gamma \Delta \Omega_\gamma</math>
If the absolute efficiency is known well, then it is possible to retrieve
If the absolute efficiency is known well, then it is possible to retrieve
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<pre>
<pre>
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N
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N...
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<\pre>
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</pre>
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Refer to the page on the [particle_singles], which is a cross section given in the same output with the integrated yields.
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Refer to the page on the [[particle_singles | particle singles]], which is a cross section given in the same output with the integrated yields.
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Maybe the answer to your last question is obvious now, but...  I would not try
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==Quickly representing a summed 4pi array==
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to think of this as correcting for 4pi, since the gamma-ray angular
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distribution has to be calculated as a function of theta, phi for 4pi in order
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Gosia can quickly integrate the p-gamma events over a <math>4\pi</math> Ge array without adding a detector at every laboratory position.  In order to do this, the output file 9 can be modified to make the first two attenuation coefficients 0 for all orders.  (File 9 is the output of OP,GDET, commonly called the *.gdt file.  For Gammasphere the *.gdt file would look something like
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to make that correction.  If you really want Gosia to tell you what the total
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yield would be for a 4pi array, you can change the *.gdt file entries after
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running OP,GDET.  For Gammasphere the *.gdt file would look something like
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<pre>
<pre>
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</pre>
</pre>
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where the first two columns have been set to 0. to simulate a 4pi array--no
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where the first two columns have been set to 0. to simulate a 4pi array.  In this case the <math>\epsilon_\gamma</math> value would
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angular attenuation.  Then you would have in the YIELD column of the output the
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still be the absolute photopeak efficiency, but <math>\Delta\Omega_\gamma</math> would be 4*pi.
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p-gamma events where the particle hit the detector as you defined it and the
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gamma ray is measured at all angles.  In this case the epsilon_gamma would
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still be the absolute photopeak efficiency, but DeltaOmega_gamma would be 4*pi.
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See pages 48 and 117 in the newest manual version, if you want to do this.  You
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should be able to figure out that the first two entries in the file above
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should be zero to represent a perfect 4pi array.
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I hope that is all clear.  I can't ever figure out a brief way to explain
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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.
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things.  Maybe after you figure this out, you can put it on the Wiki.  Your
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questions come up often.
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Revision as of 14:24, 1 June 2011

Retrieved from "https://www-user.pas.rochester.edu/~gosia/mediawiki/index.php/Integrated_yields"
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