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Kim, HyoJin,Noh, Sung Jin,Kang, Yeong-Rok,Lee, Manwoo,Jeong, Dong Hyeok,Kim, Jung Ki,Yang, Kwangmo,Ro, Tae-Ik,Shin, Sung Gyun,Kye, Yong Uk,Cho, Moo-Hyun,Kim, Guinyun Elsevier 2015 Nuclear instruments & methods in physics research. Vol.349 No.-
<P><B>Abstract</B></P> <P>The isomeric yield ratios of <SUP>133m,g</SUP>Ce and <SUP>137m,g</SUP>Ce produced from the <SUP>nat</SUP>Ce(γ,xn) reactions were determined by using the activation and the off-line γ-ray spectrometric technique with the end-point bremsstrahlung energies of 55-, 60-, and 65-MeV at 100-MeV electron linac of the Pohang accelerator laboratory. The induced activities in the irradiated foils were measured by using an energy- and efficiency-calibrated HPGe detector coupled to a PC based multi-channel analyzer. The necessary corrections were made to improve the accuracy of the experimental results. The experimental results at bremsstrahlung energies of 55-, 60-, and 65-MeV were 0.324±0.089, 0.331±0.086, and 0.403±0.089 for the <SUP>133m,g</SUP>Ce, and 0.210±0.062, 0.221±0.061, and 0.262±0.061 for the <SUP>137m,g</SUP>Ce, respectively. The present results for <SUP>nat</SUP>Ce(γ,xn)<SUP>133m,g;137m,g</SUP>Ce in this energy region were obtained for the first time which has no comparable literature data. The obtained isomeric yield ratios are compared with the calculated values based on the statistical model code TALYS 1.6.</P>
PULSED NEUTRON FACILITY BASED ON AN ELECTRON LINAC
Kim, Guinyun,Son, Dongchul,Lee, Youngseok,Ko, In Soo,Cho, Moo-Hyun,Namkyung, Won,Chang, Jonghwa 대한방사선 방어학회 2001 방사선방어학회지 Vol.26 No.3
The Pohang Neutron Facility based on an electron linac was constructed in order to construct the infrastructure for nuclear data production in Korea. It consists of a 100-MeV electron linac, a water-cooled Ta target, and an 11-m time-of-flight path. We pleasured the time-of-flight path length, the neutron energy spectra for different water levels inside the moderator, and the neutron total cross sections of polyethylene and copper by the transmission method.
Nuclear Data Production Facility Based on Electron Linac
Guinyun Kim,Dongchul Son,Hengsik Kang,Hossain Ahmed,In Soo Ko,Moo-Hyun Cho,Rachid Marchrafi,Vadim Skoy,Won Namkung,Young Seok Lee 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.42
The Pohang Neutron Facility, which is based on an electron linear accelerator, has been equipped with a new CAMAC data acquisition system consisting of a neutron-gamma separation circuit and a four-position sample changer for nuclear data production and for basic science experiments using neutrons. The system has been tested by measuring the neutron ux and the neutron total crosssections of natural W and Ti samples with the 6Li-ZnS (Ag) scintillator by using the neutron timeof- ight method. The measured neutron total cross-sections are compared with other measured data and the evaluation data in ENDF/B-VI. The present measurements are in generally good agreement with other data and the evaluated data.
Tae-Ik Ro,Guinyun Kim,Byeong Ryong Park,Hyun Kim,Kwangsoo Kim,Masayuki Igashira,Samyol Lee,Toshiro Ohsaki,Won-Chung Chung,Yeong-Rok Kang,Youngdo Oh 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
The neutron capture cross-section of $^{105}$Pd has been measured in the neutron energy range from 10 to 90 keV by using the 3-MV Pelletron accelerator of the Research Laboratory for Nuclear Reactors at the Tokyo Institute of Technology. A neutron time-of-flight method was adopted with a 1.5-ns pulsed neutron source obtained by using the $^7$Li(p,n)$^7$Be reaction and with a large anti-Compton NaI(Tl) $\gamma$-ray spectrometer. A pulse-height weighting technique was applied to measure the capture $\gamma$-ray pulse-height spectra to derive the capture yields. The capture cross-sections were obtained by using the standard capture cross-section of $^{197}$Au. The present results were corrected for isotope impurities of the sample because the samples contained various palladium isotopes. The present results were compared with previous measurements and with the evaluated data of ENDF/B-VII-b2, JEFF-3.1, and JENDL-3.3.
Yield ratios of the isomeric pair <sup>85 m,g</sup>Sr formed in <sup>nat</sup>Sr(γ,xn) reactions
Do, Nguyen Van,Thanh, Kim Tien,Khue, Pham Duc,Thi Hien, Nguyen,Kim, Guinyun,Kim, Kwangsoo,Shin, Sung-Gyun,Cho, Moo-Hyun,Kye, Yong-Uk Pergamon 2018 Radiation physics and chemistry Vol.149 No.-
<P>The yield ratios of Sr-85m,Sr-g were measured in the Sr-nat(gamma,xn)Sr-85m,Sr-g reactions with the bremsstrahlung end-point energies of 55-, 60-, and 65-MeV. The experiment was carried out by the activation method in combination with high resolution HPGe gamma-ray spectroscopy. In order to improve the accuracy of the experimental results, appropriate experimental procedure was used to reduce the influence of the strong annihilation peak (511 keV) to the 514 keV gamma-ray peak of Sr-85g. The experimental results are compared to theoretical predictions using code TALYS-1.6. The present results for 55-, and 60-MeV bremsstrahlung end-point energies have been measured for the first time.</P>