Fitting Results for Co-57 Runs

Here are fit results for Co-57 calibration runs. The data obtained from 5 coarse-grid runs and 4 far-field runs are fitted to the model based on charge transport properties in CdZnTe detectors. The current model, now including the Cd and Te escape lines, gives a fairly good fit to a summed Co-57 spectrum in the energy range that includes both the K-shell escape lines and the 122 & 136 keV lines. The model parameters are listed in the table below, where 2 parameters are fixed and the other 5 are free. Since the data is a spectrum summed up from 32K spectra, the low energy tail shows a composite feature of different 32K sets of mu*tau products. Here, however, we use a single set of mu tau products for the simplicity.
EXT NO.PARAMETER NAMEDescription
1VoltageBias voltage, which is constant usually at the nominal operation voltage of 200V.
2MuTau_EMobility-Lifetime (mu*tau) product for electron, which is fixed to 1.0e-03 cm^2/V.
3MuTau_HMobility-Lifetime (mu*tau) product for hole.
4SigmaElectronic noise in the unit of channel (1 channel corresponds to 0.25 keV), excluding the low-energy tail effect.
5GainGain parameter in the unit of channel/keV. This represents the gain for the "ch_max", that is, a peak position when charges are fully collected.
6Norm_122Normarization of 122 keV line in the unit of photons/cm^2.
7Norm_136Normarization of 136 keV line in the unit of photons/cm^2.

Coarse-Grid Runs

1. arr_x_co57_200_20_030619_2_c.pha
  • Source Position

    • SOURCE_X = -7.769216 cm
    SOURCE_Y = 4.365952 cm
    SOURCE_Z = 294.4 cm
  • Distribution Files:

    • arr_x_co57_200_20_030619_2_dist_122.txt
    arr_x_co57_200_20_030619_2_dist_136.txt
  • Fitting Parameters

    • EXT NO.PARAMETER NAMEVALUEAPPROXIMATE ERROR
    1Voltage2.00000e+02constant
    2MuTau_E1.00000e-03fixed
    3MuTau_H3.57208e-052.19670e-10
    4Sigma6.48549e+003.06631e-03
    5Gain4.44059e+001.01937e-04
    6Norm_1222.05324e+021.07227e-02
    7Norm_1362.49629e+015.65979e-03
  • Goodness of Fitting

    • Reduced-Chi-Squared = 209.253 (DOF=217)
  • Area of the Data and Model Histograms

    •  Full Energy RangeFitted Energy Region
    DATA21.008513.5152
    MODEL22.458313.4979
2. arr_x_co57_200_20_030619_3_c.pha
  • Source Position

    • SOURCE_X = -18.1492 cm
    SOURCE_Y = 15.14247 cm
    SOURCE_Z = 294.2 cm
  • Distribution Files:

    • arr_x_co57_200_20_030619_3_dist_122.txt
    arr_x_co57_200_20_030619_3_dist_136.txt
  • Fitting Parameters

    • EXT NO.PARAMETER NAMEVALUEAPPROXIMATE ERROR
    1Voltage2.00000e+02constant
    2MuTau_E1.00000e-03fixed
    3MuTau_H3.61600e-052.37160e-08
    4Sigma6.48219e+002.32808e-03
    5Gain4.43995e+003.09678e-05
    6Norm_1222.08436e+024.47041e-02
    7Norm_1362.53223e+011.63456e-02
  • Goodness of Fitting

    • Reduced-Chi-Squared = 216.42 (DOF=217)
  • Area of the Data and Model Histograms

    •  Full Energy RangeFitted Energy Region
    DATA21.435913.7752
    MODEL22.927513.7586
3. arr_x_co57_200_22_030618_6_c.pha
  • Source Position

    • SOURCE_X = -12.65648 cm
    SOURCE_Y = 3.72163 cm
    SOURCE_Z = 294.2 cm
  • Distribution Files:

    • arr_x_co57_200_22_030618_6_dist_122.txt
    arr_x_co57_200_22_030618_6_dist_136.txt
  • Fitting Parameters

    • EXT NO.PARAMETER NAMEVALUEAPPROXIMATE ERROR
    1Voltage2.00000e+02constant
    2MuTau_E1.00000e-03fixed
    3MuTau_H3.63685e-051.80316e-08
    4Sigma6.56026e+002.02610e-03
    5Gain4.44306e+002.41324e-05
    6Norm_1222.07331e+023.73366e-02
    7Norm_1362.51887e+011.49756e-02
  • Goodness of Fitting

    • Reduced-Chi-Squared = 222.613 (DOF=217)
  • Area of the Data and Model Histograms

    •  Full Energy RangeFitted Energy Region
    DATA21.152113.7235
    MODEL22.704513.7079
4. arr_x_co57_200_20_030619_8_c.pha
  • Source Position

    • SOURCE_X = -8.64948 cm
    SOURCE_Y = 17.98445 cm
    SOURCE_Z = 294.2 cm
  • Distribution Files:

    • arr_x_co57_200_20_030619_8_dist_122.txt
    arr_x_co57_200_20_030619_8_dist_136.txt
  • Fitting Parameters

    • EXT NO.PARAMETER NAMEVALUEAPPROXIMATE ERROR
    1Voltage2.00000e+02constant
    2MuTau_E1.00000e-03fixed
    3MuTau_H3.66718e-054.88737e-10
    4Sigma6.53018e+001.00993e-04
    5Gain4.44153e+001.08900e-06
    6Norm_1222.05529e+022.47369e-02
    7Norm_1362.49821e+011.29800e-02
  • Goodness of Fitting

    • Reduced-Chi-Squared = 258.821 (DOF=217)
  • Area of the Data and Model Histograms

    •  Full Energy RangeFitted Energy Region
    DATA21.024313.6351
    MODEL22.566413.619
5. arr_x_co57_200_20_030619_9_c.pha
  • Source Position

    • SOURCE_X = -12.87125 cm
    SOURCE_Y = 175.7463 cm
    SOURCE_Z = 294.2 cm
  • Distribution Files:

    • arr_x_co57_200_20_030619_9_dist_122.txt
    arr_x_co57_200_20_030619_9_dist_136.txt
  • Fitting Parameters

    • EXT NO.PARAMETER NAMEVALUEAPPROXIMATE ERROR
    1Voltage2.00000e+02constant
    2MuTau_E1.00000e-03fixed
    3MuTau_H3.00304e-059.95767e-10
    4Sigma6.24347e+001.69501e-04
    5Gain4.44596e+005.18403e-06
    6Norm_1221.37615e+023.03847e-02
    7Norm_1361.60475e+011.63747e-02
  • Goodness of Fitting

    • Reduced-Chi-Squared = 163.413 (DOF=217)
  • Area of the Data and Model Histograms

    •  Full Energy RangeFitted Energy Region
    DATA13.55528.42551
    MODEL14.29528.41139

Far-Field Runs

1. arr_x_co57_200_21_0_0_030404_1_c.pha
  • Source Position

    • SOURCE_X = 38.11794 cm
    SOURCE_Y = 147.4319 cm
    SOURCE_Z = 1931. cm
  • Distribution Files:

    • arr_x_co57_200_21_0_0_030404_1_dist_122.txt
    arr_x_co57_200_21_0_0_030404_1_dist_136.txt
  • Fitting Parameters

    • EXT NO.PARAMETER NAMEVALUEAPPROXIMATE ERROR
    1Voltage2.00000e+02constant
    2MuTau_E1.00000e-03fixed
    3MuTau_H3.25305e-057.56323e-08
    4Sigma6.36971e+009.04773e-03
    5Gain4.45056e+001.09248e-04
    6Norm_1224.72614e+003.81086e-03
    7Norm_1365.77045e-011.53371e-03
  • Goodness of Fitting

    • Reduced-Chi-Squared = 24.8609 (DOF=217)
  • Area of the Data and Model Histograms

    •  Full Energy RangeFitted Energy Region
    DATA0.4599930.303894
    MODEL0.5190330.303232
2. arr_x_co57_200_21_0_south45_030405_14_c.pha
  • Source Position

    • SOURCE_X = 1402.607 cm
    SOURCE_Y = -77.00868 cm
    SOURCE_Z = 1925.015 cm
  • Distribution Files:

    • arr_x_co57_200_21_0_south45_030405_14_dist_122.txt
    arr_x_co57_200_21_0_south45_030405_14_dist_136.txt
  • Fitting Parameters

    • EXT NO.PARAMETER NAMEVALUEAPPROXIMATE ERROR
    1Voltage2.00000e+02constant
    2MuTau_E1.00000e-03fixed
    3MuTau_H2.90494e-051.51275e-07
    4Sigma6.26185e+001.98977e-02
    5Gain4.44479e+002.35301e-04
    6Norm_1222.78537e+004.67852e-03
    7Norm_1363.45981e-011.99598e-03
  • Goodness of Fitting

    • Reduced-Chi-Squared = 5.76056 (DOF=217)
  • Area of the Data and Model Histograms

    •  Full Energy RangeFitted Energy Region
    DATA0.2630330.167657
    MODEL0.2823690.167266
3. arr_x_co57_200_21_n25_0_030405_6_c.pha
  • Source Position

    • SOURCE_X = 29.54798 cm
    SOURCE_Y = 582.2662 cm
    SOURCE_Z = 1977.128 cm
  • Distribution Files:

    • arr_x_co57_200_21_n25_0_030405_6_dist_122.txt
    arr_x_co57_200_21_n25_0_030405_6_dist_136.txt
  • Fitting Parameters

    • EXT NO.PARAMETER NAMEVALUEAPPROXIMATE ERROR
    1Voltage2.00000e+02constant
    2MuTau_E1.00000e-03fixed
    3MuTau_H2.96051e-057.97645e-09
    4Sigma6.28969e+002.86583e-03
    5Gain4.45001e+003.18614e-05
    6Norm_1224.14723e+001.95504e-03
    7Norm_1365.14628e-011.09331e-03
  • Goodness of Fitting

    • Reduced-Chi-Squared = 34.9539 (DOF=217)
  • Area of the Data and Model Histograms

    •  Full Energy RangeFitted Energy Region
    DATA0.4096510.259349
    MODEL0.4523020.258787
4. arr_x_co57_200_21_n25_0_030405_9_c.pha
  • Source Position

    • SOURCE_X = 687.1508 cm
    SOURCE_Y = 145.6109 cm
    SOURCE_Z = 1927.723 cm
  • Distribution Files:

    • arr_x_co57_200_21_n25_0_030405_9_dist_122.txt
    arr_x_co57_200_21_n25_0_030405_9_dist_136.txt
  • Fitting Parameters

    • EXT NO.PARAMETER NAMEVALUEAPPROXIMATE ERROR
    1Voltage2.00000e+02constant
    2MuTau_E1.00000e-03fixed
    3MuTau_H3.17905e-054.84120e-08
    4Sigma6.32561e+001.39772e-02
    5Gain4.45002e+003.08723e-04
    6Norm_1224.12008e+001.87810e-03
    7Norm_1365.08793e-011.13045e-03
  • Goodness of Fitting

    • Reduced-Chi-Squared = 28.1437 (DOF=217)
  • Area of the Data and Model Histograms

    •  Full Energy RangeFitted Energy Region
    DATA0.3994230.261367
    MODEL0.4478240.260811

Angular Depecdence of the Residual



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