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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.
N. Matsuda,Y. Kasugai,Y. Sakamoto,H. Nakashima,H. Matsumura,H. Iwase,N. Kinoshitay,H. Hirayama,H. Yashima,N. Mokhov,A. Levering,D. Boehnlein,K. Vazili,L. Gary,S. Wayne,K. Oishi,T. Nakamura,K. Ishibash 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Neutron spectra in high-energy region between 1 and 100 MeV in the shield configuration of the anti-proton target station and a 120-GeV proton beam at Fermi National Accelerator Laboratory (Fermilab) were determined using the reaction rate data obtained with the multi-foil activation method. Two kinds of methods were employed for the determination of neutron spectra: one is the fitting method which is newly developed in this work, another is the unfolding method with SAND-II code. The calculations were performed using the PHITS. From the comparison between the calculated and experimental neutron spectra, it concluded that the PHITS can be used for shielding design of highenergy proton accelerators.
Shielding Experiments under JASMIN Collaboration at Fermilab (I) Overview of the Research Activities
Y. Kasugai,N. Matsuda,Y. Iwamoto,Y. Sakamoto,H. Nakashima,H. Matsumura,N. Kinoshitay,H. Iwase,T. Sanami,M. Hagiwara,H. Hirayama,H. Yashima,N. Sigyo,H. Arakawa,K. Ishibashi,N. Mokhov,A. Leveling,D. Boe 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Shielding experiments were started on 2007 using high-energy proton accelerator at Fermi National Accelerator Laboratory (Fermilab) under the collaborative study program of JASMIN: Japanese and American Study of Muon Interaction and Neutron Detection. In this series of papers entitled "Shielding experiments under JASMIN collaboration at Fermilab", the part of the results regarding neutron detection has been reported. This paper, as a first paper of the series, overview of the research activities are described, and experimental results on high-energy neutron transportation are presented in a viewpoint of neutron attenuation in steel shield and applicability of Moyer's model. In addition, deductions of a neutron spectrum in wide energy range between 1 eV and 100 MeV by means of the hybrid method using the current-readout Bonner sphere together with foil-activation technique are presented.
Size Dependence of Dielectric Properties for nm-sized Barium Titanate Crystallites and Its Origin
S. Wada,H. Yasuno,H. Kakemoto,M. Yashima,S.-M. Nam,T. Tsurumi,T. Hoshina 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
Barium titanate (BaTiO3) crystallites with various particle sizes from 17 to 1,000 nm were prepared by the modiffed 2-step thermal decomposition method. Investigation of impurities in these particles by using both TG-DTA and FT-IR measurements revealed that no impurity was detected in the BaTiO3 lattice, while hydroxyl and carbonate groups were detected only on the surface. Moreover, their relative densities were always above 99 %.The dielectric constants of these powders were measured by using slurries by a modied powder dielectric-measurement method. As a result, the dielectric constant of BaTiO3 particles with a size of around 140 nm exhibited a maximum of around 5,000. By using a synchrotron-radiation X-ray powder experiment, the crystal structure of the BaTiO3 particles with sizes below 100 nm was investigated. As a result, in the BaTiO3 particles with sizes over 40 nm, it was conrmed that their crystal structure was assigned to 4 mm. In the particle size with a maximum dielectric constant of 5,000, its c=a ratio was smaller than 1.011. Finally, to explain the origin of the high dielectric constant, a model related to \superparaelectric behavior" was proposed.
T. Sanami,M. Hagiwara,H. Iwase,M. Takada,D. Satoh,Y. Iwamoto,S. Kunieda,H. Yashima,A. Tamii,M. Baba 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The experimental program to measure double differential cross section (DDX) data for fragment production is launched to establish reaction models and parameters for proton induced reaction on light-medium nuclei for the energy range from threshold to a few hundred MeV. In this program, a Bragg Curve Counter (BCC) that is improved to cover entire energy range of fragment is employed as a detector. DDXs of lithium, beryllium, boron and carbon emission at 30, 60, 90, and 135 degree were measured for 40, 50, 70, and 80 MeV proton on carbon, nitrogen, oxygen and aluminium Theoretical calculation results using three different intra-nuclear cascade models were compared with experimental data. By choosing appropriate model, the calculation generally reproduces the DDXs except for fragments having relatively high energy and small emission angle, and fragments from two body reaction.
K. Hirose,T. Ohtsuki,Y. Shibasaki,N. Iwasa,J. Hori,S. Sekimoto,K. Takamiya,H. Yashima,K. Nishio,Y. Kiyanagi 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The cross section for the neutron-induced fission of ^(237)Np was measured in an energy range from 0.1 eV to 2 keV using the lead slowing-down neutron spectrometer at the Research Reactor Institute, Kyoto University. The relative cross sections were obtained from the energy-dependent neutron flux measured using a BF^3 counter. The relative cross section for each (n,f) was normalized to the absolute value which obtained using the reference cross section for ^(235)U(n,f) between 100 eV and 1 keV.