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沈光淑,金德浩 중앙대학교 기술과학연구소 1981 기술과학연구소 논문집 Vol.8 No.-
The nuclear structure and the nuclear reaction mechanism can be comprehended by the study of heavy-ions reactions. Elastic scattering of heavy-ions induced by ?? on ??, ??, ?? and ?? have been studied at laboratory incident energies between 155 MeV and 170 MeV. The total reaction cross-sections and the interaction radius parameters were obtained by the opticalmodel analysis and the quarter-point recipe which can be derived from the measured angular distributions of elastic scattering.
Endcap Resistive Plate Chambers for the Compact Muon Solenoid Experiment
홍병식,심광숙,이경세,홍성종,박성근 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.4
We review the development of the endcap resistive plate chambers for the Compact Muon Solenoid experiment at the Large Hadron Collider. The standard double gap geometry, which was designed and constructed by the Korea Detector Laboratory, satisfies all CMS requirements including the efficiency, the time resolution, and the working high-voltage plateau range. These results clearly demonstrate that the present design of the chamber is suitable for the muon trigger system in the endcap region of the Compact Muon Solenoid detector. We also discuss the possible applications of resistive plate chambers.n
Development of a Li-Coated RPC for Low-Energy Neutron Detection
이경세,심광숙,김병일,홍병식,김현철,김지현,이광복,Mikiko Ito,류민상,홍성종,안성환,박성근,강태임 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.4
In this report, we present a newly developed hybrid resistive plate chamber (RPC) for the detection of low-energy neutrons. Lithium-°uoride (LiF) enriched for the 6Li isotope was chosen as the material sensitive to low-energy neutrons for the construction of the hybrid RPC. The LiF-coated RPC was tested by using the 252Cf neutron-irradiation facility at the Korea Atomic Energy Research Institute (KAERI). The detection e±ciency of the double-layered LiF-coated RPC to neutrons in the energy range from 10 to 560 meV was approximately 1.6 %. We obtained reliable e±ciency plateaus over a wide range of electric-.eld intensities.
Performance of Hybrid Plastic Scintillator Detectors for Low-Energy Neutron Measurements
Chong Kim,홍병식,Hyun Cheol Kim,심광숙,이경세,Rong Jiang Hu,Seong Jong Hong,Sung Keun Park,김용주 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.3
We report the performance of hybrid plastic scintillator detectors for low-energy neutron measurements. Boron- and gadolinium-loaded hybrid scintillator detectors were manufactured and tested with slow and fast neutrons. The low-energy slow neutrons were provided by moderated neutrons from a 252Cf source, whose energy ranged from 10 to 600 meV with a peak at 75 meV. To distinguish slow neutrons from fast neutrons or gamma rays, we employed the pulse-shape analysis method. For the boron-doped scintillators, the tail-to-total-charge ratio distributions for the low-energy neutrons were useful to estimate the fraction of gamma rays in the neutron signals. However, for the gadolinium-layer-implanted detectors, the difference between the low-energy neutrons and gamma rays is insignificant.
Investigation of Solid-State Photomultipliers for Positron Emission Tomography Scanners
이재성,홍성종,홍병식,이건송,송인찬,Jamil Muhammad,이준택,박광석,심광숙,이경세,Mikiko Ito 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
Solid-state devices to detect photons are under active research and development because they, unlike photomultiplier tubes (PMT), can be used under high-magnetic-field and radio-frequency environments, such as in magnetic resonance imaging (MRI) scanners. In addition, some of the solid-state devices have a higher particle detection efficiency and only a slightly less gain than PMTs, currently the first choice to detect photons in positron emission tomography (PET) scanners. We have tested solid-state photomultipliers (SSPM) among several different solid-state devices in the market. This paper describes the test methods and the characteristics of SSPMs with an emphasis on use in PET scanners. We obtained a 25 \% energy resolution and a 4.5-ns time resolution with $^{22}$Na and lutetium yttrium oxyorthosilicate (LYSO), both full-width at half maximum (FWHM). The number of fired mini-cells and the amplification factor were, respectively, estimated to be 154$~\pm~$37 for $^{22}$Na and $(3.8~\pm~0.9)~\times~10^{5}$. Even though SSPM-LYSO couplings resulted in worse performances than PMT-LYSO couplings, the solid-state devices have good potential for use in the PET scanners, especially in combined PET/MRI scanners because the new solid-state devices appear to have better characteristics, such as a higher quantum efficiency and a larger number of mini-cells, than the tested SSPMs.