Rachel simulated yield output
From GOSIA
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* The "Corrected Counts" column gives the true particle-gamma count emitted into the solid angles of the particle and Ge detectors. This is equivalent to the total counts for the beam run if the detectors were blackbodies (had 100% efficiency), or if the raw counts were corrected for the absolute p-gamma efficiency. | * The "Corrected Counts" column gives the true particle-gamma count emitted into the solid angles of the particle and Ge detectors. This is equivalent to the total counts for the beam run if the detectors were blackbodies (had 100% efficiency), or if the raw counts were corrected for the absolute p-gamma efficiency. | ||
| - | * The "Raw Counts" column is only used in this output and is not passed to Gosia. The raw counts are the estimated p-gamma counts in the raw data, assuming an approximate absolute efficiency for Gammasphere. | + | * The "Raw Counts" column is only used in this output and is not passed to Gosia. The raw counts are the estimated p-gamma counts in the raw data, assuming an approximate absolute ''intrinsic'' efficiency for Gammasphere. |
* The "Est. intr. effic." column gives the ''assumed'' absolute ''intrinsic'' efficiency <math>(\epsilon_{intr})</math> of the Ge detector used to calculate the value in the "Raw counts" column. For example, at 1333 keV, Gammasphere typically has an absolute efficiency of 9% for 100 installed detectors. Since the solid angle coverage of these 100 detectors is ~6.1 sr, the ''intrinsic'' efficiency is approximately <math>9% * 4\pi / 6.1 = 18.5%</math>. | * The "Est. intr. effic." column gives the ''assumed'' absolute ''intrinsic'' efficiency <math>(\epsilon_{intr})</math> of the Ge detector used to calculate the value in the "Raw counts" column. For example, at 1333 keV, Gammasphere typically has an absolute efficiency of 9% for 100 installed detectors. Since the solid angle coverage of these 100 detectors is ~6.1 sr, the ''intrinsic'' efficiency is approximately <math>9% * 4\pi / 6.1 = 18.5%</math>. | ||
| - | === | + | ===Accuracy checking=== |
| - | + | The predicted absolute counts (cross sections) for p-<math>\gamma</math> events were checked against perturbation calculations for weakly-coupled two-state systems where the perturbation method is valid. Both the total count rates and solid angle factors have been re-checked in version 2.0.8.beta and agree with the perturbation calculations where they are applicable. | |
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| + | The ''intrinsic'' efficiency has been estimated more accurately in version 2.0.8.beta. This will make a noticeable change in the "Raw counts" column. | ||
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| + | ===Estimating count rates in a planned experiment=== | ||
| + | Since the "Corrected counts" column gives the absolute emitted particle-gamma counts into the particle- and gamma-detector solid angles (for 100% efficiency), these values can be combined with better known values of the particle and gamma efficiencies to predict more accurate "raw" count rates, if the approximate predicted raw counts are not accurate enough. | ||
===Simulated data passed to Gosia=== | ===Simulated data passed to Gosia=== | ||
