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Van Do Nguyen,Guinyun Kim,Duc Khue Pham,Duc Thiep Tran,Hee-Seock Lee,Hengsik Kang,In Soo Ko,Moo-Hyun Cho,Tien Thanh Kim,Van Duan Phung,남궁원,Young Seok Lee,Youngdo Oh 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.2
We measured isomeric cross-section ratios for the $^{45}$Sc($\gamma$,$n$)$^{44m,g}$Sc, $^{nat}$Ti($\gamma$,$x$)$^{44m,g}$Sc, $^{103}$Rh($\gamma$,4$n$)$^{99m,g}$Rh, and $^{nat}$Fe($\gamma$,$x$)$^{52m,g}$Mn reactions at the 65-MeV electron linac of the Pohang Accelerator Laborator by using the activation method. Samples of natural Sc, Ti, Rh, and Fe metallic foils were irradiated in an uncollimated bremsstrahlung beam. The isomeric cross-section ratios were determined from the activity measurement with a high-purity germanium detector. The measured isomeric ratios were 0.21 $\pm$ 0.03, 0.12 $\pm$ 0.03, 1.43 $\pm$ 0.20, and 0.28 $\pm$ 0.04 for the $^{45}$Sc($\gamma$,$n$)$^{44m,g}$Sc, $^{nat}$Ti($\gamma$,$x$)$^{44m,g}$Sc, $^{103}$Rh($\gamma$,4$n$)$^{99m,g}$Rh, and $^{nat}$Fe($\gamma$,$x$)$^{52m,g}$Mn reactions, respectively. The present results for the $^{45}$Sc($\gamma$,$n$)$^{44m,g}$Sc and $^{nat}$Fe($\gamma$,$x$)$^{52m,g}$Mn reactions are in good agreement with other measurements. The present results for $^{nat}$Ti($\gamma$,$x$)$^{44m,g}$Sc and $^{103}$Rh($\gamma$,4$n$)$^{99m,g}$Rh reactions are the first such measurements.
Van Do Nguyen,김귀년,A.K.M. Moinul Haque MEAZE,Duc Khue Pham,Duc Thiep Tran,이희석,고인수,K. DEVAN,조무현,Van Duan Phung,남궁원,이영석 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.3
The Pohang Neutron Facility, which consists of an electron linear accelerator, a water-cooled Ta target with a water moderator, and a time-of-flight path with an 11-m length, was constructed to measure neutron total cross-sections in the neutron energy region from thermal to several hundreds of eV by using the time-of-flight method. In order to utilize this pulsed neutron facility based on an electron linac, we have to understand the characteristics of the radiation fields produced in this facility. We used the multiple-foil activation method to measure the neutron and the photon distributions produced by a water-cooled Ta target with and without the water moderator./?P믭
Photo-Neutrons Produced at the Pohang Neutron Facility Based on an Electron Linac
K. Devan,김귀년,A. K. M. M. H. Meaze,Duc Khue Pham,Duc Thiep Tran,강흥식,고인수,조무현,Van Do Nguyen,Van Duan Phung,남궁원,이영석 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.1
The Pohang Neutron Facility based on an electron linac was operated for total neutron crosssection measurements by using the pulsed neutrons produced in a water-cooled Ta-target with a water moderator. We investigated the photo-neutrons produced in the water-cooled Ta-target system by using the Monte-Carlo simulation code MCNPX, version 2.5e, and the results were checked with the experimental values. The optimum conditions of the target system and the experimental setup to maximize the thermal neutron production were investigated.