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Journal Articles

Recent improvements of the Particle and Heavy Ion Transport code System; PHITS version 3.33

Sato, Tatsuhiko; Iwamoto, Yosuke; Hashimoto, Shintaro; Ogawa, Tatsuhiko; Furuta, Takuya; Abe, Shinichiro; Kai, Takeshi; Matsuya, Yusuke; Matsuda, Norihiro; Hirata, Yuho; et al.

Journal of Nuclear Science and Technology, 9 Pages, 2023/00

https://doi.org/10.1080/00223131.2023.2275736

Times Cited Count：8 Percentile：99.12(Nuclear Science & Technology)

The Particle and Heavy Ion Transport code System (PHITS) is a general-purpose Monte Carlo radiation transport code that can simulate the behavior of most particle species with energies up to 1 TeV (per nucleon for ions). Its new version, PHITS3.31, was recently developed and released to the public. In the new version, the compatibility with high-energy nuclear data libraries and the algorithm of the track-structure modes have been improved. In this paper, we summarize the upgraded features of PHITS3.31 with respect to the physics models, utility functions, and application software introduced since the release of PHITS3.02 in 2017.

Journal Articles

Spatial variation in soil respiration rate is controlled by the content of particulate organic materials in the volcanic ash soil under a plantation

Abe, Yukiko*; Liang, N.*; Teramoto, Munemasa*; Koarashi, Jun; Atarashi-Andoh, Mariko; Hashimoto, Shoji*; Tange, Takeshi*

Geoderma Regional (Internet), 29, p.e00529_1 - e00529_11, 2022/06

https://doi.org/10.1016/j.geodrs.2022.e00529

Times Cited Count：1 Percentile：14.82(Soil Science)

This study aimed to clarify the causes of spatial variation in soil respiration rate on volcanic ash soil. From January 2013 to August 2019, soil respiration rates were measured at 40 measuring points periodically at a 35-year-old plantation in Tokyo, Japan. In August 2019, the carbon content of the litter layer, total carbon content of soil organic matter (SOM), carbon content of the low-density fraction (LF-C) of SOM, fine root biomass, and bulk density of soil were measured at all measuring points. Results of the multiple regression analysis showed that the model with only the LF-C as an explanatory variable had the highest capability for predicting the respiration rate at a soil temperature of 20 $^{circ}$ C, indicating that LF-C, which is considered to be readily available to soil microorganisms, can be the main factor responsible for the spatial variation in soil respiration rate.

Journal Articles

Dynamical response of transition-edge sensor microcalorimeters to a pulsed charged-particle beam

Okumura, Takuma*; Azuma, Toshiyuki*; Bennet, D. A.*; Caradonna, P.*; Chiu, I.-H.*; Doriese, W. B.*; Durkin, M. S.*; Fowler, J. W.*; Gard, J. D.*; Hashimoto, Tadashi; et al.

IEEE Transactions on Applied Superconductivity, 31(5), p.2101704_1 - 2101704_4, 2021/08

https://doi.org/10.1109/TASC.2021.3067793

Times Cited Count：1 Percentile：10.62(Engineering, Electrical & Electronic)

A superconducting transition-edge sensor (TES) microcalorimeter is an ideal X-ray detector for experiments at accelerator facilities because of good energy resolution and high efficiency. To study the performance of the TES detector with a high-intensity pulsed charged-particle beam, we measured X-ray spectra with a pulsed muon beam at the Japan Proton Accelerator Research Complex (J-PARC) in Japan. We found substantial temporal shifts of the X-ray energy correlated with the arrival time of the pulsed muon beam, which was reasonably explained by pulse pileup due to the incidence of energetic particles from the initial pulsed beam.

Journal Articles

Deexcitation dynamics of muonic atoms revealed by high-precision spectroscopy of electronic X rays

Okumura, Takuma*; Azuma, Toshiyuki*; Bennet, D. A.*; Caradonna, P.*; Chiu, I. H.*; Doriese, W. B.*; Durkin, M. S.*; Fowler, J. W.*; Gard, J. D.*; Hashimoto, Tadashi; et al.

Physical Review Letters, 127(5), p.053001_1 - 053001_7, 2021/07

https://doi.org/10.1103/PhysRevLett.127.053001

Times Cited Count：15 Percentile：80.44(Physics, Multidisciplinary)

We observed electronic X rays emitted from muonic iron atoms using a superconducting transition-edge-type sensor microcalorimeter. The energy resolution of 5.2 eV in FWHM allowed us to observe the asymmetric broad profile of the electronic characteristic and X rays together with the hypersatellite X rays around 6 keV. This signature reflects the time-dependent screening of the nuclear charge by the negative muon and the -shell electrons, accompanied by electron side-feeding. Assisted by a simulation, this data clearly reveals the electronic - and -shell hole production and their temporal evolution during the muon cascade process.

Journal Articles

Beta decay of the axially asymmetric ground state of $^{192}$ Re

Watanabe, Hiroshi*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Andreyev, A. N.; Hashimoto, Takashi*; Kondev, F. G.*; Lane, G. J.*; Litvinov, Yu. A.*; Liu, J. J.*; Miyatake, Hiroari*; et al.

Physics Letters B, 814, p.136088_1 - 136088_6, 2021/03

https://doi.org/10.1016/j.physletb.2021.136088

Times Cited Count：4 Percentile：55.56(Astronomy & Astrophysics)

Journal Articles

Analysis of fragmentation excitation functions of lead by carbon ions up to 400 MeV/u

Ogawa, Tatsuhiko; Morev, M. N.*; Sato, Tatsuhiko; Hashimoto, Shintaro

Nuclear Instruments and Methods in Physics Research B, 300, p.35 - 45, 2013/04

https://doi.org/10.1016/j.nimb.2013.01.031

Times Cited Count：8 Percentile：53.27(Instruments & Instrumentation)

Fragmentation reaction cross sections of lead bombarded by carbon ions below 400 MeV/u were measured and compared with those simulated with the Monte Carlo radiation transport code PHITS to pinpoint the problems of simulation based on the quantum molecular dynamics model and statistical decay model. Cross sections for 32 fragments from 24 to 85 amu and those from 121 to 175 amu were measured within a reasonable uncertainty. Comparison shows that production cross sections for fragments from 20 to 60 amu and those from 110 to 130 amu are underestimated by one order of magnitude. Further simulation shows that the production of each group of fragments in the simulation is attributed to evaporation of fission fragments and to evaporation of highly excited prefragments, respectively. The observed underestimation indicates the presence of nuclear reaction mechanisms (not considered in the current simulation), such as multi-fragmentation.

Journal Articles

Spins and parities of astrophysically important $^{30}$ S states from $^{28}$ Si( $^{3}$ He, ) $^{30}$ S

Setoodehnia, K.*; Chen, A. A.*; Komatsubara, Tetsuro*; Kubono, Shigeru*; Binh, D. N.*; Carpino, J. F.*; Chen, J.*; Hashimoto, Takashi*; Hayakawa, Takehito; Ishibashi, Yoko*; et al.

Physical Review C, 83(1), p.018803_1 - 018803_4, 2011/01

https://doi.org/10.1103/PhysRevC.83.018803

Times Cited Count：12 Percentile：60.62(Physics, Nuclear)

The structure of proton-unbound $^{30}$ S states strongly determines the thermonuclear $^{29}$ P(, ) $^{30}$ S reaction rate at temperatures characteristic of explosive hydrogen burning in classical novae and type I X-ray bursts. Specifically, the rate had been previously predicted to be dominated by two low-lying, unobserved, levels in the $_{x}$ =4.7-4.8 MeV region, with spin and parity assignments of 3 $^{+}$ and 2 $^{+}$ . In recent experimental work, two candidate levels were observed with energies of 4.699 MeV and 4.814 MeV, but no experimental information on their spins and parities was obtained. We have performed an in-beam -ray spectroscopy study of $^{30}$ S with the $^{28}$ Si( $^{3}$ He, ) $^{30}$ S reaction. The spin and parities were inferred from a comparison to the known decay schemes of the corresponding mirror states.

Journal Articles

Isoscalar giant resonances in the Sn nuclei and implications for the asymmetry term in the nuclear-matter incompressibility

Li, T.*; Garg, U.*; Liu, Y.*; Marks, R.*; Nayak, B. K.*; Madhusudhana Rao, P. V.*; Fujiwara, Mamoru*; Hashimoto, Hisanobu*; Nakanishi, Kosuke*; Okumura, Shun*; et al.

Physical Review C, 81(3), p.034309_1 - 034309_11, 2010/03

https://doi.org/10.1103/PhysRevC.81.034309

Times Cited Count：107 Percentile：97.52(Physics, Nuclear)

Journal Articles

Oriented crystallization of crosslinked -1,4-polybutadiene rubber

Saijo, Kenji*; Zhu, Y.*; Hashimoto, Takeji; Wasiak, A.*; Brzostowski, N.*

Journal of Applied Polymer Science, 105(1), p.137 - 157, 2007/07

https://doi.org/10.1002/app.26019

Times Cited Count：15 Percentile：43.99(Polymer Science)

Crosslink -1,4-polybutadiene (PB) rubber is known to undergo crystallization during mechanical deformation. This article presents small-angle X-ray scattering (SAXS), wide-angle X-ray scattering (WAXS), and stress-relaxation studies of the structural development in crosslinked PB samples crystallized under various orientation regimes. The studies are concerned with isothermal crystallization at various temperatures (10 to -50 $^{circ}$ C) and at constant elongation ratios (1-4,5) and hence with the effects of weak -to-intermediate and high orientations on oriented crystalliation versus the behavior of unoriented specimens. Although the crystallization in the weak-to-intermediate orientations is interpreted on the basis of nucleation growth, the crystallization under high orientations is best interpreted on the basis of spinodal crstallization. To the best of our knowledge, this work reports for the first time spinodal-like crystallization on oriented crosslinked polymer melts.

Journal Articles

Magnetic structure and crystal field excitation in heavy fermion superconductor CePt $_{3}$ Si

Metoki, Naoto; Kaneko, Koji; Matsuda, Tatsuma; Galatanu, A.; Takeuchi, Tetsuya*; Hashimoto, Shin*; Ueda, Taiki*; Settai, Rikio*; Onuki, Yoshichika*; Bernhoeft, N.*

Physica B; Condensed Matter, 359-361, p.383 - 385, 2005/06

https://doi.org/10.1016/j.physb.2005.01.070

Times Cited Count：1 Percentile：6.21(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Magnetic structure and the crystal field excitation in heavy-fermion antiferromagnetic superconductor CePt $_{3}$ Si

Metoki, Naoto; Kaneko, Koji; Matsuda, Tatsuma; Galatanu, A.; Takeuchi, Tetsuya*; Hashimoto, Shin*; Ueda, Taiki*; Settai, Rikio*; Onuki, Yoshichika; Bernhoeft, N.*

Journal of Physics; Condensed Matter, 16(15), p.L207 - L212, 2004/04

https://doi.org/10.1088/0953-8984/16/15/L01

Times Cited Count：92 Percentile：93.56(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Transfer function analysis of positron-emitting tracer imaging system (PETIS) data

Keutgen, N.; Matsuhashi, Shimpei; Mizuniwa, Chizuko; Ito, Takehito*; Fujimura, Takashi; Ishioka, Noriko; Watanabe, Satoshi; Sekine, Toshiaki; Uchida, Hiroshi*; Hashimoto, Shoji

Applied Radiation and Isotopes, 57(2), p.225 - 233, 2002/09

https://doi.org/10.1016/S0969-8043(02)00077-5

Times Cited Count：10 Percentile：54.8(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Real-time [ $^{11}$ C]methionine translocation in barley in relation to mugineic acid phytosiderophore biosynthesis

Bughio, N.*; Nakanishi, Hiromi*; Kiyomiya, Shoichiro*; Matsuhashi, Shimpei; Ishioka, Noriko; Watanabe, Satoshi; Uchida, Hiroshi*; Tsuji, Atsunori*; Osa, Akihiko; Kume, Tamikazu; et al.

Planta, 213(5), p.708 - 715, 2001/09

https://doi.org/10.1007/s004250100552

Times Cited Count：16 Percentile：36.74(Plant Sciences)

[ $^{11}$ C]Methionine ([ $^{11}$ C]Met) was supplied through barley roots and the $^{11}$ C signal was follwoed using a real-time imaging system (PETIS), with subsequent development of autoradiographic images of the whole plant. In all cases, [ $^{11}$ C]Met was first translocated to the discrimination center, and this part was strongly labeled. Met absorbed by roots of the plants was subsequently translocated to other parts of the plant. In Fe-deficient (-Fe) barley plants, a drastic reduction in [ $^{11}$ C]Met translocation from the roots to the shoot was observed, while a greater amount of $^{11}$ C was found in the leaves of Fe-sufficient or Met-pretreated -Fe plants. Treatment of -Fe plants with amiooxyacetic acid increased the translocation of [ $^{11}$ C]Met to the shoot. The retention of exogenously supplied [ $^{11}$ C]Met in the roots of -Fe barley indicates that the Met is used in the biosynthesis of mugineic acid (MA) in barley roots. This and the absence of Met movement from shoots to the roots suggest that the MA phytosiderophores precursor Met originates in the roots of plants.

Journal Articles