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Nakata, Kotaro*; Hasegawa, Takuma*; Solomon, D. K.*; Miyakawa, Kazuya; Tomioka, Yuichi*; Ota, Tomoko*; Matsumoto, Takuya*; Hama, Katsuhiro; Iwatsuki, Teruki; Ono, Masahiko*; et al.
Applied Geochemistry, 104, p.60 - 70, 2019/05
Times Cited Count：9 Percentile：38.79(Geochemistry & Geophysics)no abstracts in English
+ 
Li reactions using the continuum-discretized coupled-channels methodIchinkhorloo, D.*; Matsumoto, Takuma*; Hirabayashi, Yoshiharu*; Kato, Kiyoshi*; Chiba, Satoshi
Journal of Nuclear Science and Technology, 48(11), p.1357 - 1360, 2011/10
Times Cited Count：6 Percentile：44.28(Nuclear Science & Technology)The + Li reactions are important not only from the basic interest of the system but also from the application point of view. In this work, we study Li breakup reactions of incident neutron energies 11.5, 14.1 and 18.0 MeV by applying an 
+ 
cluster model to 
Li and using the continuum-discretized coupled-channels approach. At the present energy, our calculation gives almost good agreement with experimental data.
Ogata, Kazuyuki*; Matsumoto, Takuma*; Hashimoto, Shintaro; Minomo, Kosho*; Egami, Tomoaki*; Iseri, Yasunori*; Kono, Michio*; Chiba, Satoshi; Bertulani, C. A.*; Shimizu, Yoshifumi*; et al.
Journal of Physics; Conference Series, 312, p.082008_1 - 082008_10, 2011/09
Times Cited Count：1 Percentile：47.57(Physics, Nuclear)Recent studies on breakup reactions with the continuum-discretized coupled channels method are reviewed. The topics covered are: four-body breakup processes for He induced reaction, dynamical relativistic effects on coulomb breakup, microscopic description of projectile breakup processes, description of ternary processes (new triple- reaction rate) and new approach to inclusive breakup processes.
Li(
)Li
reactions with the microscopic coupled-channels methodMatsumoto, Takuma*; Ichinkhorloo, D.*; Hirabayashi, Yoshiharu*; Kato, Kiyoshi*; Chiba, Satoshi
Physical Review C, 83(6), p.064611_1 - 064611_6, 2011/06
Times Cited Count：21 Percentile：75.6(Physics, Nuclear)We investigate Li()Li
reactions by using the continuum-discretized coupled-channels method with the complex Jeukenne-Lejeune-Mahaux effective nucleon-nucleon interaction. In this study, the Li nucleus is described by a d + cluster model. The calculated elastic cross sections for incident energies between 7.47 and 24.0 MeV are in good agreement with experimental data. Furthermore, we show that the neutron spectra for Li breakup states measured at selected angular points and incident energies can be also reproduced systematically.
Ishida, Hisashi; Yura, Kei; Kano, Takuma; Matsumoto, Atsushi
Annual Report of the Earth Simulator Center April 2006 - March 2007, p.257 - 263, 2007/09
The Earth Simulator has the highest power ever achieved to perform molecular dynamics simulation of large-scale supra-molecular systems. We are developing a molecular dynamics simulation system, called SCUBA, which is designed to run a system composed of more than a million particles efficiently on parallel computers. This fisical year, the arrays used in the program of SCUBA were intensively optimized to reduce the amount of memory use. This optimization enabled SCUBA to perform molecular dynamics simulations of large-scale supra-molecular systems comprised of more than a million atoms on the Earth Simulator. Moreover, the Martyna-Klein-Tuckerman algorithm was extended to utilize the multiple time step method, which increases the time step length significantly. Then, in order to elucidate the dynamics of the 70S ribosome, molecular dynamics simulation of the 70S ribosome including its explicit solvent, a system which is composed of about two million atoms, has been performed using SCUBA. A model of a nascent polypeptide was included in the system to investigate how the nascent polypeptide passes through the exit tunnel within the large subunit of the 70S ribosome. The ratchet-like motion of the 70S ribosome, which is thought to be important for the genetic translation, was successfully observed.
Yamada, Susumu; Imamura, Toshiyuki*; Kano, Takuma; Ohashi, Yoji*; Matsumoto, Hideki*; Machida, Masahiko
Journal of the Earth Simulator, 7, p.23 - 35, 2007/06
In order to explore a possibility of superfluidity in confined strongly-correlated fermion systems, e.g., nano-scale cuprate High-Tc superconductors and atomic Fermi gases loaded on an optical lattice, we implement an exact diagonalization code for their mathematical model, i.e., a trapped Hubbard model on the Earth Simulator. We compare two diagonalization algorithms, the traditional Lanczos method and a new algorithm, the preconditioned conjugate gradient (PCG) method, and find that when using the PCG the total CPU time can be reduced to 1/3 
1/5 compared to the former one since the convergence can be dramatically improved by choosing a good preconditioner and the communication overhead is much more efficiently concealed in the PCG method. Consequently, such a performance improvement enables us to do systematic studies for several parameters. Numerical simulation results reveal that an unconventional type of pairing specific to the confined system, which can cause superfluidity, develops under a strong repulsive interaction.
He + 
C scatteringMatsumoto, Takuma*; Hiyama, Emiko*; Ogata, Kazuyuki*; Iseri, Yasunori*; Kamimura, Masayasu*; Chiba, Satoshi; Yahiro, Masanobu*
Physical Review C, 70(6), p.061601_1 - 061601_5, 2004/12
Times Cited Count：154 Percentile：98.31(Physics, Nuclear)no abstracts in English
Kato, Yoshiyuki; Kurita, Tsutomu; Matsumoto, Masaki; Suzuki, Masahiro; Ishii, Katsunori; Yamamoto, Takuma; Kihara, Yoshiyuki; Yoshimoto, Katsunobu; Fujii, Kanichi
no journal, ,
An earlier accomplishment of FBR(fast breeder reactor) fuel cycle is the supreme subject from the point of view on the protection of environment by suppressing the green house effect as well as saving the oil. Microwave heating (MH) is employed as the MOX (mixed oxides U-Pu) production process in the main stream of FBR cycle. Thus, we are the optimization of MH method. We will describe the practical work of MOX fuel production which recycles the consumed nuclear fuel containing both U and Pu. The MH is employed to solidify the mixed solution by evaporating nitric acid and water. We call this processing de-nitration. The physical, mechanical, and chemical characteristics of the products are analyzed, being thereby discussed the contribution of the MH technology to the MOX fuel production. And, optimization of MH is discussed from the view point of design of MH oven, regulation of MH power, and combination with several auxiliary heating sources.
Li+n inelastic reactions in the Continuum Discredited Coupled Channels (CDCC) methodIchinkhorloo, D.*; Matsumoto, Takuma*; Hirabayashi, Yoshiharu*; Kato, Kiyoshi*; Chiba, Satoshi
no journal, ,
The few-body, especially three-body, problem is still an open (and therefore interesting) subject in nuclear physics, and has been studied intensively by various theoretical frameworks. The n + Li reactions are important not only from the basic interest but also from the application point of view. The Li nucleus is well described by the cluster model such as + d and + p + n. Therefore, it is necessary for us to treat the n + Li system with + p + n and + p + n + n models. In this work, we study the Li+n inelastic reactions applying the + d cluster model to Li and using the continuum-discredited coupled-channels (CDCC) approach.
Li+n inelastic reactions in the continuum discretized coupled channels (CDCC) methodIchinkhorloo, D.*; Matsumoto, Takuma*; Hirabayashi, Yoshiharu*; Kato, Kiyoshi*; Chiba, Satoshi
no journal, ,
The Li nucleus is well described by the cluster model such as + and + 
+ . Therefore, it is necessary for us to treat the n + Li system with + + and + + + models. In this work, we study the Li+n elastic scattering and inelastic one to the Li breakup state (E
= 2.18 MeV) applying the + cluster model to Li and using the continuum-discretized coupled-channels (CDCC) approach.
Fukui, Tokuro; Kanada-En'yo, Yoshiko*; Kikuchi, Yuma*; Matsumoto, Takuma*; Ogata, Kazuyuki*; Suhara, Tadahiro*; Taniguchi, Yasutaka*; Yahiro, Masanobu*
no journal, ,
