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H. Ohgaki,T. Kii,K. Masuda,M. Omer,T. Misawa,C. H. Pyeon,R. Hajima,T. Hayakawa,T. Shizuma,M. Kando,I. Daito,H. Toyokawa 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.51
A nuclear material detection system based on neutron / gamma-ray hybrid system has been proposed for the container inspection at the sea port. The neutron from the inertial electrostatic confinement fusion source will be used for a fast pre-screening process by using both of neutrons and gamma-rays. The nuclear resonance fluorescence gamma-ray induced by quasi-monochromatic gamma-ray beam from the laser Compton Backscattering will be used in isotope identification for the precise post-screening process. The combination of two different probes, neutrons and gamma-rays, can detect nuclear material hidden by any kind of shielding.
The (γSF) Method - Determination of Radiative Neutron Capture Cross Sections for Unstable Nuclei
H. Utsunomiya,S. Goriely,H. Akimune,H. Harada,F. Kitatani,S. Goko,H. Toyokawa,K. Yamada 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
An indirect method of determining radiative neutron-capture cross sections for unstable nuclei which we refer to as the γ-ray strength function (γSF) method is outlined and applied to Zr and Sn isotopes. Photoneutron cross sections for ^(91,92,94,96)Zr and ^(117,116)Sn near neutron threshold show the presence of extra γ-ray strengths known as giant M1 and pygmy E1 resonances on top of the low-energy γSF of GDR. Based on the γSF method, we present (n,γ) cross sections for two radioactive nuclei, a long-lived fission product, ^(93)Zr with T^(1/2) = 1.5 × 10^6 y and an s-process branching point nucleus, ^(95)Zr with T^(1/2) = 64.0 d.
Measurement of (γ,n) Cross Sections of Se Isotopes Using Laser-Compton Scattering γ-rays
F. Kitatani,S. Goko,H. Harada,H. Utsunomiya,H. Akimune,H. Toyokawa,K. Yamada 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The photo-nuclear cross sections of Se isotopes (^(80)Se, ^(78)Se, ^(77)Se, ^(76)Se) were measured with laser-Compton scattering (LCS) γ-rays to supply fundamental data for the estimation of the inverse reaction cross sections, i.e., the ^(79)Se(n,γ)^(80)Se cross section. Enriched Se isotope samples were irradiated with LCS γ-rays whose maximum energy was varied from each near neutron separation energy to each threshold energy (γ, 2n) of reaction. The energy distributions of LCS γ-rays were precisely determined using a high-resolution high-energy photon spectrometer (HHS). Emitted neutrons were detected by a high efficiency 4π - ^3He detector. The excitation functions of the photo-nuclear cross section of Se isotopes were determined. The energy point corresponding to each cross section was deduced using the accurately determined energydistribution of LCS γ-rays.