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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.
Interference Effect betweenϕandΛ(1520)Production Channels in theγp→K+K−pReaction near Threshold
Ryu, S. Y.,Ahn, J. K.,Nakano, T.,Ahn, D. S.,Ajimura, S.,Akimune, H.,Asano, Y.,Chang, W. C.,Chen, J. Y.,Daté,, S.,Ejiri, H.,Fujimura, H.,Fujiwara, M.,Fukui, S.,Hasegawa, S.,Hicks, K.,Horie, K.,Ho American Physical Society 2016 Physical Review Letters Vol.116 No.23
<P>The phi-Lambda(1520) interference effect in the gamma p -> K(+)K(-)p reaction has been measured for the first time in the energy range from 1.673 to 2.173 GeV. The relative phases between phi and Lambda(1520) production amplitudes were obtained in the kinematic region where the two resonances overlap. The measurement results support strong constructive interference when K+K- pairs are observed at forward angles but destructive interference for proton emission at forward angles. Furthermore, the observed interference effect does not account for the root s = 2.1 GeV bump structure in forward differential cross sections for phi photoproduction. This fact suggests possible exotic structures such as a hidden-strangeness pentaquark state, a new Pomeron exchange, or rescattering processes via other hyperon states.</P>