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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.
Measurement of High Energy Neutron Induced Cross Sections for Chromium
S. Sekimoto,T. Utsunomiya,H. Yashima,H. Joto,S. Shibata,K. Ninomiya,D. Satoh,Y. Iwamoto,T. Omoto,R. Nakagaki,N. Takahashi,A. Shinohara,T. Shima,M. Hagiwara,H. Matsumura,K. Nishiizumi,Y. Matsushi,H. Ma 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Reaction cross sections for Cr induced by neutrons at 287 MeV were measured by using ^7Li(p,n) reaction at N0 beam line in the Research Center for Nuclear Physics (RCNP), Osaka University. To estimate quasi-monoenergetic neutron-induced cross sections, the Cr sample was irradiated on the two angles of 0° and 30° for the axis of the primary proton beam. Proton-induced reaction cross sections for Cr at 300 MeV were also measured. The measured cross section data in the ^(nat)Cr(n,x) and ^(nat)Cr(p,x) reactions are compared with the literature values and the JENDL high-energy file. Furthermore, those in the ^(nat)Cr(n,x) reactions are also compared with those in the ^(nat)Cr(p,x) reaction.