1. Analysis report 4. 13 th. 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) Kinetic energy [MeV] Energy Loss [MeV] Kinetic energy [MeV] Energy Loss [MeV] Kinetic energy [MeV] Overlaid DEMONS GEANT Energy Loss [MeV] E-loss distribution is same with GEANT. Then, response function is ?

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

4. Measurement of Birk’s parameter C 1 =0.00757 Birk’s saturation function Original parameter Measured parameter ~67~60.3 ADC[MeVee] Kinetic E [MeV] ADC[MeVee] Kinetic E [MeV] DATA (E549) GEANT

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

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

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

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

9. Background subtracted spectrum Semi-inclusive [Line] and background [Point] Momentum [MeV/c] Background subtracted neutron spectra 5 MeVee7 MeVee10 MeVee15 MeVee20 MeVee 5 MeVee7 MeVee10 MeVee15 MeVee20 MeVee

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

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