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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.
An Assistant System for Riding a Unicycle
M. Iwase,Y. Kanai,M. Kinoshita,S. Hatakeyama,Y. Kashimura,I. Hanazaki,T. Yokoyama,H. Higaki,K. Fujisawa 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2007 International Journal of Assistive Robotics and Me Vol.8 No.1
The final purpose of this study is to design a control system to assist in the skill of riding a unicycle. To realize such a system, it is necessary to make a mathematical model and to analyze the dynamics of the unicycle. It is ideal that the dynamics of a unicycle is kept as original as possible even if any automatic support control is required to assist the operator. Thus, this paper presents modeling of the unicycle and a control system design by the controlled Lagrangian to realize this type of controller.
Applicability of the PHITS Code to Heavy Ion Accelerator Facilities
Koji Niita,H. Iwase,Y. Iwamoto,T. Sato,N. Matsuda,Y. Sakamoto,H. Nakashima,L. Sihver 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
PHITS, a general-purpose Particle and Heavy Ion Transport code System, has been used for various research fields such as radiation science, accelerator and its shielding design, space research, medical application and material research. In this paper, we present an overview of the PHITS code, particularly the heavy ion reaction model included in the code and the capability of the transport of charged particles and heavy ions under magnetic field and discuss the applicability of the PHITS code to heavy ion accelerator facilities by showing some examples of the analysis.
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.
A novel quantum interference probe of the energy spectrum of coupled nanodevices
T.P. Martin,R.P. Taylor,H. Linke,B. Murray,N. Aoki,D. Oonishi,Y. Iwase,Y. OchiaI 한국물리학회 2006 Current Applied Physics Vol.6 No.3
Quantum transport of an array of quantum billiards is investigated as a function of the coupling strength of the quantum point con-invasive probe of two characteristic energy scales of the energy level spectrumthe average energy level spacing and average energy levelbroadening. This analysis reveals a marked transition in the coherent area of the array as the coupling between the billiards is increasedand the array evolves into a combined quantum system.
Event Generator Models in the Particle and Heavy Ion Transport Code System; PHITS
Koji Niita,Y. Iwamoto,T. Sato,N. Matsuda,Y. Sakamoto,H. Nakashima,H. Iwase,L. Sihver 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
We present the event generator models incorporated in the particle and heavy ion transport code system PHITS. For the high energy nuclear reactions, we discuss the QMD model and the INC model followed by the statistical decay model. For low energy neutron transport by using the nuclear data, we propose a new model, in which we combine the evaluated nuclear data and the reaction models so as to describe all ejectiles of collision keeping the energy and momentum conservation. By this new model, we can estimate new quantities which are related to the higher order correlations beyond one-body observable, for an example, the deposit energy distribution in a cell, which cannot be obtained by the transport calculation based on the Boltzmann equation with the evaluated nuclear data.