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Analysis report 4. 13 th . Friday 2007.

Analysis report 4. 13 th . Friday 2007. H.Yim. To apply efficiency correction on the data spectrum, DEMONS code is investigated and modified. Kinetic energy vs. Energy Loss (Before ADC conversion). DEMONS. GEANT. Kinetic energy [MeV]. Kinetic energy [MeV]. Energy Loss [MeV].

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Analysis report 4. 13 th . Friday 2007.

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  1. Analysis report4. 13th. Friday 2007. H.Yim To apply efficiency correction on the data spectrum, DEMONS code is investigated and modified.

  2. Kinetic energy vs. Energy Loss(Before ADC conversion) DEMONS GEANT Kinetic energy [MeV] Kinetic energy [MeV] Energy Loss [MeV] Energy Loss [MeV] Overlaid E-loss distribution is same with GEANT. Then, response function is ? Kinetic energy [MeV] Energy Loss [MeV]

  3. Modified DEMONSOriginal response function  Birk’s saturaion function Overlaid with GEANT result DEMONS Kinetic Energy [MeV] Kinetic Energy [MeV] ADC [MeVee] ADC [MeVee] Birk’s saturation function is successfully implemented in DEMONS code.

  4. Measurement of Birk’s parameter GEANT DATA (E549) Kinetic E [MeV] Kinetic E [MeV] ADC[MeVee] ADC[MeVee] ~67 ~60.3 ADC[MeVee] ADC[MeVee] Birk’s saturation function Original parameter Measured parameter C1=0.00757

  5. Applying measured Birk’s parameters to simulations GEANT with new Birk’s para DEMONS with new Birk’s para Kinetic Energy [MeV] Kinetic Energy [MeV] ADC [MeVee] ADC [MeVee] Overlaid Kinetic Energy [MeV] Now, DEMONS and GEANT shows same performance. (at least, about proton simulation) ADC [MeVee]

  6. Data(E549) & GEANT GEANT with new Birk’s para DEMONS Kinetic energy [MeV] Kinetic energy [MeV] ADC [MeVee] ADC [MeVee] Overlaid Kinetic energy [MeV] ADC [MeVee]

  7. Neutron spectrum comparison 1/beta vs. ADC 1/beta vs. ADC 1/beta 1/beta Modified DEMONS Data (E549) ADC [MeVee] ADC [MeVee] Now, stripe pattern is well agree.

  8. Neutron efficiency Threshold 0 MeVee Detection efficiency 3 MeVee 5 MeVee 7 MeVee 10 MeVee 15 MeVee 20 MeVee Momentum MeV/c

  9. Background subtracted spectrum Semi-inclusive [Line] and background [Point] 5 MeVee 7 MeVee 10 MeVee 15 MeVee 20 MeVee Momentum [MeV/c] Momentum [MeV/c] Momentum [MeV/c] Momentum [MeV/c] Momentum [MeV/c] Background subtracted neutron spectra 5 MeVee 7 MeVee 10 MeVee 15 MeVee 20 MeVee Momentum [MeV/c] Momentum [MeV/c] Momentum [MeV/c] Momentum [MeV/c] Momentum [MeV/c]

  10. Efficiency corrected spectra Background subtracted Semi-inclusive Efficiency corrected Momentum [MeV/c] Momentum [MeV/c] Momentum [MeV/c]

  11. Summary • Response function of DEMONS code is modified to make agreement with data. • Efficiency corrected neutron spectra were obtained.

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