표제지
제출문
요약문
SUMMARY(영문요약문)
목차
제1장 서론 10
제2장 국내외 연구개발 현황 12
제3장 연구 개발 수행 내용 및 결과 14
제4장 연구개발 목표 달성도 및 대외 기여도 69
제5장 연구개발 결과 활용 계획 70
참고문헌 71
부록 74
1) Fitting parameter 74
2) 응답함수 계산 과정 76
3) weighting function 구하기 82
서지정보양식 88
Table 1. Characteristics of KIGAM accelerator. 16
Table 2. Neutron energy to be emitted on H(p,n)³He reaction by Kinematics. 33
Table 3. Characteristics of KIGAM prompt gamma-ray detecting system. 45
Table 4. Characteristics of isotope nuclei. 48
Table 5. Differences between incident gamma-ray and W(I)·R(I,Eo) 57
Table 6. Characteristics of Au sample. 66
Fig. 1. Beam profile corresponding to the position of slit. 17
Fig. 2. Post beam current corresponding to the applied sweeping voltage. 17
Fig. 3. Beam width corresponding the applied sweeping voltage. 18
Fig. 4. The bunching electrode and the applied voltage to this electrode. 21
Fig. 5. Pulse beam width corresponding to the variation of relative bunching phase to chopping phase. 22
Fig. 6. Time diagram for measuring the flight times of pulsed neutron and gamma-ray. (unit of number is nano-sec, g denotes gamma-ray and n means neutron.) 23
Fig. 7. The pulse beam width corresponding the variation of bunching voltage. 23
Fig. 8. Time spectrum from 27Al(p,γ) reaction by the pulse beam.(이미지참조) 24
Fig. 9. The pulse beam width corresponding the variation of the initial beam energy. 24
Fig. 10. Inductor for impedance matching and RF high voltage. 28
Fig. 11. RF power supply and its applied RF voltage. 29
Fig. 12. Pin number of npn RF power transistor(MRF454). 29
Fig. 13. Time pick-off module 34
Fig. 14. Induced beam shape from time pick-off module. 34
Fig. 15. Production principle of pulsed beam by the difference of relative phase between chopping electrode and pulsing electrode. 35
Fig. 16. Time of flight spectrum for the neutron with the energy of 2.2 MeV. 36
Fig. 17. Pulse beam with the repetition of 250 ns. 37
Fig. 18. Pulse beam with the repetition of 125 ns. 38
Fig. 19. Time resolution as a function of distance from neutron detector to neutron target. 39
Fig. 20. Neutron detection efficiency of BC-501 detector. 40
Fig. 21. Neutron energy spectrum. 40
Fig. 22. Neutron energy as a function of scattering angle on 3H(p,n)3He. 41
Fig. 23. Pulse heught spectra of 27Al(p,γ) retaction at the proton energy of 1.808 MeV. The decayed gamma-ray of 11.522 MeV from the excited state of 13.321 MeV of 28Si to energy level of 1.799 MeV is shown. 46
Fig. 24. Pulse height spectrum from 137Cs source. Solid lines mean Compton edge peak (CEP), Compton continuous part (CCP), Full peak (FP), and sum peak of them. The CCP is fitted by 3rd degree polynomials, the FP and the CEP are fitted by Gaussian function.(이미지참조) 47
Fig. 25. Absolute efficiencies of full peak (FP), Compton-edge peak (CEP), double escape peak (DEP), and single escape peak (SEP) of KIGAM PGS. Dots are experimental data and solid lines are the fitting data. 49
Fig. 26. Resolution of full peak as a function of gamma-ray energy. The resolution difference of the measured data to the fitted data at about 7 MeV is due to the interferences of two gamma-rays of 6.92 MeV and 7.12 MeV from 19F(p,ag) reaction. Dots are experimental data and solid lines are the fitting data.(이미지참조) 50
Fig. 27. Comparisons of the calculated response functions with the measured response functions from (a) 137Cs, (b) 22Na. Dots are experimental data and solid lines are the calculated data.(이미지참조) 51
Fig. 28. Comparisons of the calculated response functions with the measured response functions from (a) 27Al(p,γ) reaction and (b) 19F(p,αγ) reaction. Dots are experimental data and solid lines are the calculated data.(이미지참조) 52
Fig. 29. Response functions for various gamma-ray energies. 53
Fig. 30. Weighting function of KIGAM prompt gamma-ray detector. 56
Fig. 31. Product between the response functions and the weighting function for a few gamma-ray energy. 57
Fig. 32. Multiplied spectrum of the weighting function by the pulse height spectrum of 27Al(p,γ) reaction for a proton energy of 0.992 MeV. The gamma-rays of 10.76 MeV, 7.93 MeV, 6.20 MeV, 4.74 MeV, 2.84 MeV, 1.78 MeV, and 1.52 MeV are shown.(이미지참조) 58
Fig. 33. Measurement diagram of neutron capture cross section. 61
Fig. 34. Time resolution comparison of BC-501 with NaI(Tl). 61
Fig. 35. Two parameter coincidence spectrum 62
Fig. 36. Energy spectrum to be selected from coincidence spectrum. 63
Fig. 37. time spectrum to be selected from coincidence spectrum. 63
Fig. 38. Neutron spectrum on monitor detector. 66
Fig. 39. Neutron total cross sections of 197Au.(이미지참조) 67
Fig. 40. Gamma-ray pulse height spectrum of 198Au after neutron captures with energies of 2.2 MeV less than.(이미지참조) 67
Fig. 41. Gamma-ray time of flight spectrum of 198Au after neutron captures with energies of 2.2 MeV less than.(이미지참조) 68