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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.
Y. H. Matsuda,T. Nakamura,K. Kuga,S. Nakatsuji,S. Michimura,T. Inami,N. Kawamura,M. Mizumaki 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The valence state of Yb ions in β-YbAlB4 and its polymorph α-YbAlB4 has been investigated byusing X-ray absorption and emission spectroscopy in SPring-8 at temperatures from 2 to 280 K. Theobserved Yb valence is 2.78 ± 0.01 in β-YbAlB4 at 2 K by using the X-ray emission spectroscopy. The valence is found to gradually increase with increasing temperature toward the trivalent state,and the characteristic temperature of the valence fluctuation is expected to be about 290 K. Wealso found a small increase in the Yb valence ( 0.002) by applying a magnetic field of 32 T at40 K to β-YbAlB4.
Contribution of a Non-classical HLA Gene, HLA-DOA, to the Risk of Rheumatoid Arthritis
Okada, Y.,Suzuki, A.,Ikari, K.,Terao, C.,Kochi, Y.,Ohmura, K.,Higasa, K.,Akiyama, M.,Ashikawa, K.,Kanai, M.,Hirata, J.,Suita, N.,Teo, Y.Y.,Xu, H.,Bae, S.C.,Takahashi, A.,Momozawa, Y.,Matsuda, K.,Momoh University of Chicago Press [etc.] 2016 American journal of human genetics Vol.99 No.2
<P>Despite the progress in human leukocyte antigen (HLA) causal variant mapping, independent localization of major histocompatibility complex (MHC) risk from classical HLA genes is challenging. Here, we conducted a large-scale MHC fine-mapping analysis of rheumatoid arthritis (RA) in a Japanese population (6,244 RA cases and 23,731 controls) population by using HLA imputation, followed by a multi-ethnic validation study including east Asian and European populations (n=7,097 and 23,149, respectively). Our study identified an independent risk of a synonymous mutation at HLA-DOA, a non-classical HLA gene, on anti-citrullinated protein autoantibody (ACPA)-positive RA risk (p=1.4 x 10(-) 9), which demonstrated a cis-expression quantitative trait loci (cis-eQTL) effect on HLA-DOA expression. Trans-ethnic comparison revealed different linkage disequilibrium (LD) patterns in HLA-DOA and HLA-DRB1, explaining the observed HLA-DOA variant risk heterogeneity among ethnicities, which was most evident in the Japanese population. Although previous HLA fine-mapping studies have identified amino acid polymorphisms of the classical HLA genes as driving genetic susceptibility to disease, our study additionally identifies the dosage contribution of a non-classical HLA gene to disease etiology. Our study contributes to the understanding of HLA immunology in human diseases and suggests the value of incorporating additional ancestry in MHC fine-mapping.</P>
Optical anisotropy and diamagnetic energy shifts in InP-GaP lateral quantum wells
Shin, Y.H.,Kim, Yongmin,Song, J.D.,Lee, Y.T.,Saito, H.,Nakamura, D.,Matsuda, Y.H.,Takeyama, S. Elsevier 2014 Journal of luminescence Vol.151 No.-
Linearly polarized photoluminescence (PL) measurements were made from InP-GaP lateral multiple quantum wells induced by composition modulation along the lateral direction. At B=0, two prominent emission peaks emerged, which are identified as transitions from In-rich well and Ga-rich barrier. regions. Both transitions are strongly linear polarized parallel to the [110] crystal direction. While rotating PL orientation from [110] to [1-10] direction, the well and barrier transitions show red- and blue-shifts, respectively, due to the different valence states. In high magnetic fields, the two peaks exhibit different diamagnetic energy shifts mainly because of the effective-mass difference in the In-rich and Ga-rich alternate regions along the lateral direction. (C) 2014 Elsevier B.V. All rights reserved.
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.
Electrostatic Electron Cyclotron Harmonic Waves as a Candidate to Cause Pulsating Auroras
Fukizawa, M.,Sakanoi, T.,Miyoshi, Y.,Hosokawa, K.,Shiokawa, K.,Katoh, Y.,Kazama, Y.,Kumamoto, A.,Tsuchiya, F.,Miyashita, Y.,Tanaka, Y. ‐,M.,Kasahara, Y.,Ozaki, M.,Matsuoka, A.,Matsuda, S.,Hikish American Geophysical Union 2018 Geophysical Research Letters Vol.45 No.23
M. Hagiwara,T. Sanami,K. Masumoto,Y. Iwamoto,N. Matsuda,Y. Sakamoto,Y. Nakane,H. Nakashima,Y. Uwamino 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Nuclear data on proton-induced neutron and γ-ray production in the energy range from 10 to 20 MeV is important to estimate the shield design and activation of low-energy cyclotron facilities for medical use such as production of radiopharmaceuticals in positron emission tomography (PET). We have measured double-differential thick target yields (TTYs) of neutrons and γ-rays from a ^(18)O-enriched water (H^(18)_2O) target induced by 18 MeV protons in order to estimate leakage radiations from a cyclotron and the neutron-induced activation in the production process of the ^(18)F-tagged fluorodeoxyglucose (FDG) which is a common radiopharmaceuticals for PET. Neutrons and γ-rays were measured with 5.08 cm diameter × 5.08 cm long NE213 scintillators for eight laboratory angles between 15- and 150-degrees. After applying a neutron-γ-ray event separation using the pulse-shape-discrimination (PSD) technique the neutron and γ-ray events were analyzed by a time-of-flight (TOF) technique and an unfolding technique, respectively. The measured TTYs were compared with TENDL-2009 data library and the physical model calculations with MCNPX and PHITS. The calculated TTYs roughly agree with the measured data.
Synthesis and properties of higher homologs of extended TTP donors
Y. Misaki,A. Kubo,W. Matsuda,H. Fueno,K. Tanaka 한국물리학회 2006 Current Applied Physics Vol.6 No.5
A series of multi-fused extended tetrathiafulvalene (TTF), in which thiophene ring is inserted between two 1,3-dithiole rings inTTF (ThTTF-n,n = 35,7), have been synthesized. In the electronic spectra, no signicant red shift bas been observed as the num-ber of fused extended TTFs increases. Cyclic voltammograms of the ThTTF-n are composed ofn . 2 pairs of two-electron transferwaves and two pair of one-electron-transfer ones, while four pairs of single-electron-transfer waves have been observed for ThTTF-2. Molecular orbital calculation suggests the highest occupied molecular orbitals (HOMOs) of ThTTF-n spread over the molecule,while the lowest unoccupied molecular orbitals (LUMOs) are localized on the central thiophene moieties.
Frustrated minority spins in GeNi<sub>2</sub>O<sub>4</sub>
Matsuda, M.,Chung, J.-H.,Park, S.,Sato, T. J.,Matsuno, K.,Aruga Katori, H.,Takagi, H.,Kakurai, K.,Kamazawa, K.,Tsunoda, Y.,Kagomiya, I.,Henley, C. L.,Lee, S.-H. Editions de Physique 2008 Europhysics letters Vol.82 No.3
<P>Recently, two consecutive phase transitions were observed, upon cooling, in an antiferromagnetic spinel GeNi<SUB>2</SUB>O<SUB>4</SUB> at <I>T</I><SUB><I>N</I>1</SUB>=12.1 K and <I>T</I><SUB><I>N</I>2</SUB>=11.4 K, respectively (Crawford M. K. <I>et al</I>., <I>Phys. Rev. B</I>, <B>68</B> (2003) 220408(R)). Using unpolarized and polarized elastic neutron scattering we show that the two transitions are due to the existence of frustrated minority spins in this compound. Upon cooling, at <I>T</I><SUB><I>N</I>1</SUB> the spins on the 〈111〉 kagome planes order ferromagnetically in the plane and antiferromagnetically between the planes (phase I), leaving the spins on the 〈111〉 triangular planes that separate the kagome planes frustrated and disordered. At the lower <I>T</I><SUB><I>N</I>2</SUB>, the triangular spins also order in the 〈111〉 plane (phase II). We also present a scenario involving exchange interactions that qualitatively explains the origin of the two purely magnetic phase transitions.</P>