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Light-Ion Production from a Thin Silicon Target Bombarded by 175 MeV Quasi Monoenergetic Neutrons
S. Hirayama,Y. Watanabe,Y. Naitou,P. Andersson,R. Bevilacqua,C. Gustavsson,M. Osterlund,S. Pomp,V. Simutkin,H. Sjostrand,A. Hjalmarsson,A. Prokofiev,M. Tesinsky,U. Tippawan 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Double-differential production yields of light ions (p, d, t, ^3He, and α from a thin silicon target induced by 175 MeV quasi mono-energetic neutrons were measured using the MEDLEY setup at the The Svedberg Laboratory (TSL) in Uppsala in order to benchmark evaluated nuclear data and nuclear reaction models. The MEDLEY is a conventional spectrometer system which consists of eight counter telescopes. Each telescope is composed of two silicon surface barrier detectors as the ΔE detectors and a CsI(Tl) scintillator as the E detector for particle identification. The telescopes are placed at angles from 20˚ to 160˚ in steps of 20˚. The measured double-differential yields of light ions are compared with PHITS calculations using the following nuclear reaction options: the high-energy nuclear data library (JENDL/HE-2007), the quantum molecular dynamics (QMD) model, and the intra-nuclear cascade (INC) model.
S. Kunieda,T. Fukahori,S. Hirayama,Y. Watanabe 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Applicability of the pre-equilibrium coalescence model was investigatedtoward the construction of advanced and comprehensive nuclear data. Thisstudy was devoted to the analysis for nucleon-induced alpha-particleproduction cross sections up to 200 MeV. The optical model calculation wasperformed with suitable potential parameters both for incident- andoutgoing- channels. The Iwamoto-Harada-Sato coalescence model wasincorporated into the GNASH code in order to take account the pickupcontribution from the pre-equilibrium stages. It was found that the presentapproach enabled us to reproduce measured cross sections better thanempirical models which had been commonly used for nuclear data evaluations up to ~100 MeV. From comparisons between the modelcalculations and experimental data, we discuss the behaviors of the modelparameters and applicability limit of the present approach.
Applicability of Nuclear Reaction Models Implemented in PHITS to Simulations on Single-event Effects
S. Abe,S. Hirayama,Y. Watanabe,N. Sano,Y. Tosaka,M. Tsutsui,H. Furuta,T. Imamura 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The nuclear reaction models implemented in the PHITS (Particle and Heavy Ion Transport code System), i.e., the INC model, the QMD model and "event generator mode (e-mode)" with the JENDL-3.3 are validated to apply it to simulations on single-event effects. The model calculations are compared with available experimental data of light-ion (proton and alpha particle) production from neutron-induced reactions on ^(nat)Si and ^(16)O for neutron energies below 100 MeV. Since there is no measurement of lightion production from Si for neutron energies more than 100 MeV, proton-induced reactions on ^(27)Al are also used in the model validation. Comparisons of calculated and measured data for lightion production show that the e-mode calculation with JENDL-3.3 provides better agreement with the experimental data below 20 MeV than the INC and QMD models, and the QMD model reproduces them well above 20 MeV.
Effects of VFAs and Glucose Infusions on Ruminating Behavior of the Fasted-Goats
Oshiro, S.,Kawamura, T.,Hirayama, T.,Hirakawa, M.,Higoshi, H. Asian Australasian Association of Animal Productio 1998 Animal Bioscience Vol.11 No.2
To test their roles in rumination behavior, metabolites (acetic acid, propionic acid, butyric acid and glucose) were intravenously infused into the jugular vein of goats during fasting. The heads of four female goats tested were locked in a stanchion of cages in an experimental room. Ruminating behaviors with regard to number of ruminations, ruminating time, number of remastications and remasticating time were significantly decreased by acetic acid infusion (p < 0.05), and tended to be depressed more on values in butyric acid infusion or glucose infusion than those in pre-infusions, but propionic acid infusion decreased a little. Those data suggest that rumination receptors sensitive to VFAs and glucose are more likely to be situated in the area, where they would respond too blood levels.
Light-Ion Production in The Interaction of 175 MeV Neutrons with Iron and Bismuth
R. Bevilacqua,S. Pomp,V. D. Simutkin,U. Tippawan,M. Hayashi,S. Hirayama,Y. Naitou,Y. Watanabe,A. V. Prokofiev,A. Hjalmarsson,P. Andersson,J. Blomgren,M. Osterlund,M. Tesinsky,F. -R. Lecolley,N. Marie 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
We have measured double-differential (angle and energy) cross sections for light-ion (p, d, t, ^3He, and α) production in the interaction of quasi-monoenergetic 175 MeV neutrons with iron and bismuth. Measurements have been performed at the The Svedberg Laboratory, Uppsala (Sweden), using the Medley setup which allows low-energy thresholds and wide energy and angular ranges. Medley is a spectrometer system consisting of eight three-element telescopes placed at angles from 20˚ to 160˚, in steps of 20˚. Each telescope is composed of two silicon surface barrier detectors and a CsI(Tl) scintillator, to perform particle identification,fully stop the produced light-ions and measure their kinetic energy. The time-of-flight was used to reduce the contribution from the low energy tail in the accepted incident neutron spectrum. We report double-differential production cross sections for protons, deuterons, tritons, ^3He and α particles and compare them with model calculations with TALYS-1.2.
Asato, N.,Hirayama, T.,Higa, T.,Onodera, R.,Shinjo, A.,Oshiro, S. Asian Australasian Association of Animal Productio 2003 Animal Bioscience Vol.16 No.2
Acetone, which is produced from butyric acid when it passes through the rumen wall, was infused into the rumen and jugular veins of three female goats to investigate the role of acetone in ruminating and masticating behavior. The ruminating behavior, as measured by the number of boli and the ruminating time, decreased (p<0.05) with intraruminal acetone infusion. However, the ruminating behavior did not change significantly in response to intravenous acetone infusion. Feed intake significantly decreased with intraruminal acetone infusion, but not with intravenous acetone infusion. The concentrations of acetone in the plasma increased significantly (p<0.05) with both acetone infusion regions. Ruminal fluid acetone, and isopropyl alcohol (IPA), which is one of the ketone bodies, produced from acetone by bacterial action in rumen, concentrations were significantly increased (p<0.05) with both acetone infusion regions. These results suggest that the chemoreceptors sensitive to acetone are more likely to be in the rumen epithelium, portal system, or liver, where they can respond to acetone levels.
Effects of Isopropyl Alcohol Infusions on the Ruminating Behavior of Goats
Asato, N.,Hirata, T.,Hirayama, T.,Onodera, R.,Shinjo, A.,Oshiro, S. Asian Australasian Association of Animal Productio 2001 Animal Bioscience Vol.14 No.8
Metabolites, such as isopropyl alcohol (IPA) produced by rumen fermentation, were intravenously infused into a jugular vein of goats during feeding to explore the mechanism and roles of IPA in ruminating behavior (number of boli and ruminating time). Three female goats were confined in metabolism cages with a stanchion, The ruminating behavior measured by the number of ruminations, ruminating time, number of remastications, and remasticating time decreased (p<0,05) with intravenous IPA infusion. The IPA concentrations and VFA concentrations increased in the blood circulation. Our data suggest that sensitive receptors of rumination to IPA are more likely to be in an area such as the brain stem where they can respond to blood metabolite levels.
Characterization of ANITA and QMN Neutron Beams at TSL Using Proton Recoil Techniques
Y. Naitou,Y. Watanabe,S. Hirayama,M. Hayashi,A. Prokofiev,A. Hjalmarsson,S. Pomp,P. Andersson,R. Bevilacqua,C. Gustavsson,M. Osterlund,V. Simutkin,H. Sjostrand,M. Tesinsky,U. Tippawan 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Neutron beam characterization measurements have been carried out in both the ANITA and QMN modes using the incident proton beam of 180 MeV at the The Svedverg Laboratory (TSL) in Uppsala. The spectral neutron flux data have been obtained by measuring elastic np-scattering with the Medley setup. The experimental results in the ANITA and QMN modes are compared with an MCNPX simulation and with the systematics of QMN spectra, respectively.