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Journal Articles

Heavy hadronic molecules coupled with multiquark states

Yamaguchi, Yasuhiro; Garc$'i$a-Tecocoatzi, H.*; Giachino, A.*; Hosaka, Atsushi; Santopinto, E.*; Takeuchi, Sachiko*; Takizawa, Makoto*

Few-Body Systems, 62(3), p.33_1 - 33_7, 2021/09

 Times Cited Count:0 Percentile:0(Physics, Multidisciplinary)

We investigate the hidden-charm pentaquarks as hadronic molecules of $$Lambda_cbar{D}^{(ast)}$$ and $$Sigma_c^{(ast)}bar{D}^{(ast)}$$ coupled to a $$uudcbar{c}$$ compact core by employing an interaction satisfying the heavy quark and chiral symmetries. Our model can consistently explain the masses and decay widths of $$P_c^+(4312)$$, $$P_c^+(4440)$$ and $$P_c^+(4457)$$ with spin parity assignments $$J^P=1/2^-$$, $$3/2^-$$ and $$1/2^-$$, respectively. We find that the mass ordering is dominantly determined by the short-range interaction given by coupling to the compact core, while the decay widths by the tensor force of the one-pion exchange.

Journal Articles

The Mass spectrum of $$P_c$$ pentaquarks in hadron dynamics

Yamaguchi, Yasuhiro

Genshikaku Kenkyu, 65(2), p.19 - 30, 2021/03

Recently exotic hadrons including a $$cbar{c}$$ component have been reported in experimental researches. The exotic states cannot be explained by the ordinary hadron picture, namely a baryon as a three-quark state, and a meson as a quark-antiquark state, while a multiquark component would be dominated in their structure. We investigate the $$P_c$$ pentaquarks reported by LHCb as a $$bar{D}^{(*)}Lambda_c-bar{D}^{(*)}Sigma_c^{(*)}$$ hadronic molecule coupling to a $$qqqcbar{c}$$ compact core. The coupling to the core plays an short-range interaction ($$5q$$ potential) generating an attraction. In addition, the one pion exchange potential (OPEP) as a long-range interaction is introduced. Our model can consistently explain the masses and widths of the $$P_c$$ states reported by LHCb in 2019. The role of the interactions employed is investigated, and we find that the structure of the energy level is determined by the $$5q$$ potential, while the decay width by the tensor term of the OPEP.

Journal Articles

Quark level and hadronic contributions to the electric dipole moment of charged leptons in the standard model

Yamaguchi, Yasuhiro; Yamanaka, Nodoka*

Physical Review D, 103(1), p.013001_1 - 013001_20, 2021/01

 Times Cited Count:4 Percentile:94.14(Astronomy & Astrophysics)

We evaluate the electric dipole moment (EDM) of charged leptons in the standard model. We first prove that, at the quark-gluon level, it is suppressed due to the GIM mechanism. We then calculate the hadronic long distance contribution generated by vector mesons at one-loop level. The $$|Delta S|$$ = 1 weak hadronic interaction is derived using the factorization, and the strong interaction is modeled by the hidden local symmetry framework. We find that the EDMs of charged leptons obtained from this hadronic mechanism are much larger than the perturbative four-loop level quark-gluon process, by several orders of magnitude.

Journal Articles

Large long-distance contributions to the electric dipole moments of charged leptons in the standard model

Yamaguchi, Yasuhiro; Yamanaka, Nodoka*

Physical Review Letters, 125(24), p.241802_1 - 241802_7, 2020/12

 Times Cited Count:6 Percentile:81.73(Physics, Multidisciplinary)

We reevaluate the electric dipole moment (EDM) of charged leptons in the standard model using hadron effective models. We find unexpectedly large EDM generated by the hadron level long-distance effect, $$d_e = 5.8times 10^{-40}$$, $$d_{mu} = 1.4times 10^{-38}$$, and $$d_{tau}= -7.3times 10^{-38}$$ $$e$$cm, with an error bar of 70%, exceeding the conventionally known four-loop level elementary contribution by several orders of magnitude.

Journal Articles

Photoproduction of $$bar{D}^0 Lambda_c^+$$ within the Regge-plus-resonance model

Skoupil, D.*; Yamaguchi, Yasuhiro

Physical Review D, 102(7), p.074009_1 - 074009_19, 2020/10

 Times Cited Count:0 Percentile:0.01(Astronomy & Astrophysics)

$$bar{D}$$-meson photoproduction off the proton is studied, which will be useful tool to investigate the charmed-hadron properties. Since many parameters are still unknown in the charmed-hadron photoproduction, we employ the Regge-plus-resonance model, where there are limited number of parameters needed to be adjusted. The background part is modeled within the Regge model with the $$bar{D}^0$$ trajectories being exchanged in the $$t$$ channel or $$Lambda_c^+$$ trajectories in the $$u$$ channel. These contributions create the cross sections which are smooth functions of energies. We also introduce the exchange of the hidden-pentaquarks $$P_c$$ in the $$s$$ channel that create the sharp peak in the cross section predictions.

Journal Articles

$$P_c$$ pentaquarks with chiral tensor and quark dynamics

Yamaguchi, Yasuhiro; Garc$'i$a-Tecocoatzi, H.*; Giachino, A.*; Hosaka, Atsushi; Santopinto, E.*; Takeuchi, Sachiko*; Takizawa, Makoto*

Physical Review D, 101(9), p.091502_1 - 091502_7, 2020/05

 Times Cited Count:19 Percentile:96.13(Astronomy & Astrophysics)

We investigate the hidden-charm pentaquarks as hadronic molecules of $$Lambda_cbar{D}^{(ast)}$$ and $$Sigma_c^{(ast)}bar{D}^{(ast)}$$ coupled to a $$uudcbar{c}$$ compact core by employing an interaction satisfying the heavy quark and chiral symmetries. Our model can consistently explain the masses and decay widths of $$P_c^+(4312)$$, $$P_c^+(4440)$$ and $$P_c^+(4457)$$ with spin parity assignments $$J^P=1/2^-$$, $$3/2^-$$ and $$1/2^-$$, respectively. We find that the mass ordering is dominantly determined by the short-range interaction given by coupling to the compact core, while the decay widths by the tensor force of the one-pion exchange.

Journal Articles

Emergent spin-1 Haldane gap and ferroelectricity in a frustrated spin-$$frac{1}{2}$$ ladder

Ueda, Hiroshi*; Onoda, Shigeki*; Yamaguchi, Yasuhiro*; Kimura, Tsuyoshi*; Yoshizawa, Daichi*; Morioka, Toshiaki*; Hagiwara, Masayuki*; Hagiwara, Masato*; Soda, Minoru*; Masuda, Takatsugu*; et al.

Physical Review B, 101(14), p.140408_1 - 140408_6, 2020/04

 Times Cited Count:2 Percentile:44.66(Materials Science, Multidisciplinary)

Journal Articles

The Surface composition of asteroid 162173 Ryugu from Hayabusa2 near-infrared spectroscopy

Kitazato, Kohei*; Milliken, R. E.*; Iwata, Takahiro*; Abe, Masanao*; Otake, Makiko*; Matsuura, Shuji*; Arai, Takehiko*; Nakauchi, Yusuke*; Nakamura, Tomoki*; Matsuoka, Moe*; et al.

Science, 364(6437), p.272 - 275, 2019/04

 Times Cited Count:140 Percentile:99.81(Multidisciplinary Sciences)

The near-Earth asteroid 162173 Ryugu, the target of Hayabusa2 sample return mission, is believed to be a primitive carbonaceous object. The Near Infrared Spectrometer (NIRS3) on Hayabusa2 acquired reflectance spectra of Ryugu's surface to provide direct measurements of the surface composition and geological context for the returned samples. A weak, narrow absorption feature centered at 2.72 micron was detected across the entire observed surface, indicating that hydroxyl (OH)-bearing minerals are ubiquitous there. The intensity of the OH feature and low albedo are similar to thermally- and/or shock-metamorphosed carbonaceous chondrite meteorites. There are few variations in the OH-band position, consistent with Ryugu being a compositionally homogeneous rubble-pile object generated from impact fragments of an undifferentiated aqueously altered parent body.

JAEA Reports

Annual report on the effluent control of low level liquid waste in Nuclear Fuel Cycle Engineering Laboratories FY2017

Nakano, Masanao; Fujita, Hiroki; Mizutani, Tomoko; Nagaoka, Mika; Inoue, Kazumi; Koike, Yuko; Yamada, Ryohei; Yoshii, Hideki*; Hiyama, Yoshinori*; Otani, Kazunori*; et al.

JAEA-Review 2018-028, 120 Pages, 2019/02

JAEA-Review-2018-028.pdf:2.69MB

Based on the regulations (the safety regulation of Tokai Reprocessing Plant, the safety regulation of nuclear fuel material usage facilities, the radiation safety rule, the regulation about prevention from radiation hazards due to radioisotopes, which are related with the nuclear regulatory acts, the local agreement concerning with safety and environment conservation around nuclear facilities, the water pollution control law, and by law of Ibaraki Prefecture), the effluent control of liquid waste discharged from the Nuclear Fuel Cycle Engineering Laboratories of Japan Atomic Energy Agency has been performed. This report describes the effluent control results of the liquid waste in the fiscal year 2017. In this period, the concentrations and the quantities of the radioactivity in liquid waste discharged from the reprocessing plant, the plutonium fuel fabrication facilities, and the other nuclear fuel material usage facilities were much lower than the limits authorized by the above regulations.

JAEA Reports

Annual report on the effluent control of low level liquid waste in Nuclear Fuel Cycle Engineering Laboratories FY2016

Nakano, Masanao; Fujita, Hiroki; Nagaoka, Mika; Inoue, Kazumi; Koike, Yuko; Yoshii, Hideki*; Hiyama, Yoshinori*; Otani, Kazunori*; Kikuchi, Masaaki*; Sakauchi, Nobuyuki*; et al.

JAEA-Review 2017-037, 119 Pages, 2018/03

JAEA-Review-2017-037.pdf:2.58MB

Based on the regulations (the safety regulation of Tokai Reprocessing Plant, the safety regulation of nuclear fuel material usage facilities, the radiation safety rule, the regulation about prevention from radiation hazards due to radioisotopes, which are related with the nuclear regulatory acts, the local agreement concerning with safety and environment conservation around nuclear facilities, the water pollution control law, and bylaw of Ibaraki Prefecture), the effluent control of liquid waste discharged from the Nuclear Fuel Cycle Engineering Laboratories of Japan Atomic Energy Agency has been performed. This report describes the effluent control results of the liquid waste in the fiscal year 2016. In this period, the concentrations and the quantities of the radioactivity in liquid waste discharged from the reprocessing plant, the plutonium fuel fabrication facilities, and the other nuclear fuel material usage facilities were much lower than the limits authorized by the above regulations.

Journal Articles

Evidence for momentum-dependent heavy fermionic electronic structures; Soft X-ray ARPES for the superconductor CeNi$$_{2}$$Ge$$_{2}$$ in the normal state

Nakatani, Yasuhiro*; Aratani, Hidekazu*; Fujiwara, Hidenori*; Mori, Takeo*; Tsuruta, Atsushi*; Tachibana, Shoichi*; Yamaguchi, Takashi*; Kiss, Takayuki*; Yamasaki, Atsushi*; Yasui, Akira*; et al.

Physical Review B, 97(11), p.115160_1 - 115160_7, 2018/03

AA2018-0003.pdf:1.65MB

 Times Cited Count:3 Percentile:16.65(Materials Science, Multidisciplinary)

Journal Articles

Circular dichroism in resonant angle-resolved photoemission spectra of LaNi$$_{2}$$Ge$$_{2}$$

Nakatani, Yasuhiro*; Fujiwara, Hidenori*; Aratani, Hidekazu*; Mori, Takeo*; Tachibana, Shoichi*; Yamaguchi, Takashi*; Kiss, Takayuki*; Yamasaki, Atsushi*; Yasui, Akira*; Yamagami, Hiroshi*; et al.

Journal of Electron Spectroscopy and Related Phenomena, 220, p.50 - 53, 2017/01

 Times Cited Count:1 Percentile:13.25(Spectroscopy)

We report the soft X-ray angle-resolved photoemission study for LaNi$$_{2}$$Ge$$_{2}$$ to reveal the electronic structures derived from non-4$$f$$ bands of the heavy fermion compound CeNi$$_{2}$$Ge$$_{2}$$. The photoemission spectra recorded at the La M$$_{4,5}$$ absorption edges clearly show the enhancement of the La 5$$d$$ components in the valence band spectra. The circular dichroism of photoemission spectra reveals the band-dependent dichroic response due to the orbital symmetry.

Journal Articles

Electronic structures of ferromagnetic CeAgSb$$_{2}$$; Soft X-ray absorption, magnetic circular dichroism, and angle-resolved photoemission spectroscopies

Saito, Yuji; Fujiwara, Hidenori*; Yamaguchi, Takashi*; Nakatani, Yasuhiro*; Mori, Takeo*; Fuchimoto, Hiroto*; Kiss, Takayuki*; Yasui, Akira*; Miyawaki, Jun*; Imada, Shin*; et al.

Journal of the Physical Society of Japan, 85(11), p.114713_1 - 114713_7, 2016/11

 Times Cited Count:9 Percentile:56.08(Physics, Multidisciplinary)

We report on the electronic structures of ferromagnetic CeAgSb$$_{2}$$ using soft X-ray absorption (XAS), magnetic circular dichroism (XMCD), and angle-resolved photoemission (ARPES) spectroscopies. The Ce $$M_{4,5}$$ XAS spectra show very small satellite structures, reflecting a strongly localized character of the Ce 4${it f}$ electrons. The linear dichroism effects in the Ce $$M_{4,5}$$ XAS spectra demonstrate the ground-state Ce 4${it f}$ symmetry of $$Gamma$$$$_{6}$$, the spatial distribution of which is directed along the ${it c}$-axis. Nevertheless, ARPES spectra at the Ce 3$$d$$-4$$f$$ resonance show the momentum dependence of the intensity ratio between Ce 4$$f^{1}_{5/2}$$ and 4$$f^{1}_{7/2}$$ peaks in a part of the Brillouin zone, suggesting the non negligible momentum-dependent hybridization effect between the Ce 4${it f}$ and the conduction electrons. This is associated with the moderate mass enhancement in CeAgSb$$_{2}$$.

Journal Articles

Development of a widely usable amino acid tracer; $$^{76}$$Br-$$alpha$$-methyl-phenylalanine for tumor PET imaging

Hanaoka, Hirofumi*; Ohshima, Yasuhiro; Suzuki, Yurika*; Yamaguchi, Aiko*; Watanabe, Shigeki; Uehara, Tomoya*; Nagamori, Shushi*; Kanai, Yoshikatsu*; Ishioka, Noriko; Tsushima, Yoshito*; et al.

Journal of Nuclear Medicine, 56(5), p.791 - 797, 2015/05

 Times Cited Count:15 Percentile:65.72(Radiology, Nuclear Medicine & Medical Imaging)

Journal Articles

Clinical significance of L-type amino acid transporter 1 expression as a prognostic marker and potential of new targeting therapy in biliary tract cancer

Kaira, Kyoichi*; Sunose, Yutaka*; Ohshima, Yasuhiro; Ishioka, Noriko; Arakawa, Kazuhisa*; Ogawa, Tetsushi*; Sunaga, Noriaki*; Shimizu, Kimihiro*; Tominaga, Hideyuki*; Oriuchi, Noboru*; et al.

BMC Cancer, 13, p.482_1 - 482_12, 2013/10

 Times Cited Count:51 Percentile:85.76(Oncology)

Journal Articles

Biological evaluation of 3-[$$^{18}$$F]fluoro-$$alpha$$-methyl-D-tyrosine (D-[$$^{18}$$F]FAMT) as a novel amino acid tracer for positron emission tomography

Ohshima, Yasuhiro; Hanaoka, Hirofumi*; Tominaga, Hideyuki*; Kanai, Yoshikatsu*; Kaira, Kyoichi*; Yamaguchi, Aiko*; Nagamori, Shushi*; Oriuchi, Noboru*; Tsushima, Yoshito*; Endo, Keigo*; et al.

Annals of Nuclear Medicine, 27(4), p.314 - 324, 2013/05

 Times Cited Count:13 Percentile:51.48(Radiology, Nuclear Medicine & Medical Imaging)

Journal Articles

The Concept of dose system for radiological protection

Hirayama, Hideo*; Nakashima, Hiroshi; Sanami, Toshiya*; Yamaguchi, Yasuhiro; Sato, Osamu*; Takagi, Shunji*; Suzuki, Toshikazu*; Iwai, Satoshi*

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 55(2), p.83 - 96, 2013/02

Since the accident at the Fukushima Daiichi Power Plant, units of radiation doses such as Sv have been frequently reported by newspapers. However, it is not exactly understood even by experts on nuclear engineering that there are two different concepts which are the protection quantity such as the effective dose related to a radiation health risk and the practical quantity such as ambient dose equivalents related to measurements. In this special issue, Radiological Protection Quantity, and Operational Quantity and Radiological Protection Quantity, explain the radiation protection dose system including the protection and practical quantities established by ICRP and ICRU. Relation between Dosimeters used at Fukushima etc. and Radiological Protection Quantity describes a method and its problems to measure radiations from Cs on surface and underground using survey meters and personal dosimeters, and convert the measured values to effective doses.

Journal Articles

Synthesis of radioiodinated antitumor cyclic peptide, [$$^{125}$$I]-sansalvamide A derivative

Watanabe, Shigeki; Yamada, Keiichi*; Tsukui, Narutaka*; Hanaoka, Hirofumi*; Ohshima, Yasuhiro; Yamaguchi, Aiko*; Oku, Hiroyuki*; Ishioka, Noriko

JAEA-Review 2012-046, JAEA Takasaki Annual Report 2011, P. 88, 2013/01

Journal Articles

Editorial work of the Japanese Journal of Health Physics

Yamaguchi, Yasuhiro

Senmon Toshokan, (256), p.25 - 28, 2012/11

The Japan Health Physics Society addresses the issues of radiation protection for uses of nuclear energy, radiation and radioactive materials in a varaity of fields and issues quarterly the Japanese Journal of Health Physics. The Journal contains scientific papers, reports and news, recently articles about the effects of the Fukushima nuclear accident. People have a great interest in the radiation protection issues due to the accident. This article presents the editorial work of the Journal.

Journal Articles

Outline of the new IAEA basic safety standards for radiation protection

Yamaguchi, Yasuhiro

Iryo Hoshasen Bogo Newsletter, (59), p.5 - 8, 2010/12

International Basic Safety Standards for Protection against Ionizing Radiation and for the Safety of Radiation Sources (BSS) has being revised and its draft 4.0 was opened for comment. The manuscript describes the outline of the BSS draft 4.0, its role in the system of IAEA safety standard and major points of the revision.

185 (Records 1-20 displayed on this page)