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GeFujiwara, Hidenori*; Nakatani, Yasuhiro*; Aratani, Hidekazu*; Kanai-Nakata, Yuina*; Yamagami, Kohei*; Hamamoto, Satoru*; Kiss, Takayuki*; Sekiyama, Akira*; Tanaka, Arata*; Ebihara, Takao*; et al.
New Physics; Sae Mulli, 73(12), p.1062 - 1066, 2023/12
symmetry for anisotropic 
hybridization in the heavy-fermion superconductor CeNiGeFujiwara, Hidenori*; Nakatani, Yasuhiro*; Aratani, Hidekazu*; Kanai, Yuina*; Yamagami, Kohei*; Hamamoto, Satoru*; Kiss, Takayuki*; Yamasaki, Atsushi*; Higashiya, Atsushi*; Imada, Shin*; et al.
Physical Review B, 108(16), p.165121_1 - 165121_10, 2023/10
Times Cited Count：0 Percentile：0(Materials Science, Multidisciplinary) symmetry in CeCuGe; Soft X-ray absorption and hard X-ray photoemission spectroscopyAratani, Hidekazu*; Nakatani, Yasuhiro*; Fujiwara, Hidenori*; Kawada, Moeki*; Kanai, Yuina*; Yamagami, Kohei*; Fujioka, Shuhei*; Hamamoto, Satoru*; Kuga, Kentaro*; Kiss, Takayuki*; et al.
Physical Review B, 98(12), p.121113_1 - 121113_6, 2018/09
Times Cited Count：5 Percentile：25.53(Materials Science, Multidisciplinary)VAl probed by soft X-ray spectroscopiesNagai, Kodai*; Fujiwara, Hidenori*; Aratani, Hidekazu*; Fujioka, Shuhei*; Yomosa, Hiroshi*; Nakatani, Yasuhiro*; Kiss, Takayuki*; Sekiyama, Akira*; Kuroda, Fumiaki*; Fujii, Hitoshi*; et al.
Physical Review B, 97(3), p.035143_1 - 035143_8, 2018/01
Times Cited Count：22 Percentile：69.75(Materials Science, Multidisciplinary)We have studied the electronic structure of ferrimagnetic MnVAl single crystals by means of soft X-ray absorption spectroscopy (XAS), X-ray absorption magnetic circular dichroism (XMCD), and resonant soft X-ray inelastic scattering (RIXS). We have successfully observed the XMCD signals for all the constituent elements. The Mn L
XAS and XMCD spectra are reproduced by spectral simulations based on density-functional theory, indicating the itinerant character of the Mn 3
states. On the other hand, the V 3 electrons are rather localized since the ionic model can qualitatively explain the V L XAS and XMCD spectra. This picture is consistent with local 
excitations revealed by the V L
RIXS.
-orbital symmetry of the ground state in Yb compounds by linear dichroism in core-level photoemissionMori, Takeo*; Kitayama, Satoshi*; Kanai, Yuina*; Naimen, Sho*; Fujiwara, Hidenori*; Higashiya, Atsushi*; Tamasaku, Kenji*; Tanaka, Arata*; Terashima, Kensei*; Imada, Shin*; et al.
Journal of the Physical Society of Japan, 83(12), p.123702_1 - 123702_5, 2014/12
Times Cited Count：16 Percentile：68.37(Physics, Multidisciplinary)We show that the strongly correlated 4-orbital symmetry of the ground state is revealed by linear dichroism in core-level photoemission spectra, as we have discovered for YbRhSi and YbCuSi. Theoretical analysis shows us that the linear dichroism reflects the anisotropic charge distributions resulting from a crystalline electric field. We have successfully determined the ground-state 4 symmetry for both compounds from the polarization-dependent angle resolved core-level spectra at a temperature well below the first excitation energy. The excited-state symmetry is also probed by temperature dependence of the linear dichroism where the high measurement temperatures are on the order of the crystal-field-splitting energies.
Kabuto, Shoji; Kinoshita, Naoki; Tanaka, Takayuki; Kuwabara, Jun; Seki, Takeo
Dai-24-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.9 - 12, 2011/07
A Tandetron Accelerator Mass Spectrometer (AMS) manufactured by High Voltage Engineering Europa in Netherlands had been set up at the Mutsu office of Aomori Research and Development Center, Japan Atomic Energy Agency (JAEA) in 1997. This AMS features 3 MV Tandetron accelerator and two independence beamlines for 
C and 
I measurement. In this report, we describe the summary of the current status at 2010-2011.
C measurement at JAEA-AMS-MUTSUTanaka, Takayuki; Kabuto, Shoji; Kinoshita, Naoki; Seki, Takeo
Nagoya Daigaku Kasokuki Shitsuryo Bunsekikei Gyoseki Hokokusho, 22, p.169 - 173, 2011/03
An accelerator mass spectrometry at Mutsu office, Japan Atomic Energy Agency (JAEA AMS MUTSU) was established in 1997 and the routine operation of radiocarbon measurement was started from 1999. The radiocarbon was measured by 1,053 samples in 2010, and the number of radiocarbon measurements reached 10,342 samples since the routine operation. This AMS has adopted the open door policy for the general users from the fiscal year of 2006 and various researches have been in progress by many users. In this presentation, I introduce the current status of JAEA AMS MUTSU.
Tanaka, Takayuki; Kabuto, Shoji; Kinoshita, Naoki; Suzuki, Takashi; Kuwabara, Jun; Seki, Takeo
Dai-13-Kai AMS Shimpojiumu Hokokusho, p.129 - 132, 2011/01
An accelerator mass spectrometry at Aomori Research and Development Center, JAEA (JAEA-AMS-MUTSU) was established in 1997 and the routine operation of C and I measurement was started from 1999 and 2003, respectively. This AMS has adopted the open door policy for the general users from the fiscal year of 2006 and various researches have been in progress by many users. In this presentation, we introduce the status of JAEA-AMS-MUTSU. The total number of measurements has increased well for five years after the open door policy excluding in 2008. The reasons for the decrease in 2008 were that we had stopped the operation of AMS for about one and half months because the operation system of AMS was upgraded, and that we could not measure the C for several months because the amplifier of detector had broken. We had resolved this trouble and our AMS can measure smoothly both C and I.
Tanaka, Takayuki; Kabuto, Shoji; Kinoshita, Naoki; Suzuki, Takashi; Kuwabara, Jun; Seki, Takeo
Dai-23-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.113 - 116, 2010/11
An accelerator mass spectrometry at Aomori Research and Development Center, JAEA (JAEA-AMS-MUTSU) was established in 1997 and the routine operation of C and I measurement was started from 1999 and 2003, respectively. This AMS has adopted the open door policy for the general users from the fiscal year of 2006 and various researches have been in progress by many users. In this presentation, we introduce the status of JAEA-AMS-MUTSU in the fiscal year of 2009. The C and I were measured by 480 and 677 samples in the fiscal year of 2009, respectively. The total number of measurements has decreased by 716 samples from that of the fiscal year of 2008. The reasons for this decrease were that we had stopped the operation of AMS for about one and half months because the operation system of AMS was upgraded, and that we could not measure the C for several months because the amplifier of detector had broken. We had resolved this trouble and our AMS can measure smoothly both C and I.
Tanaka, Takayuki; Otosaka, Shigeyoshi; Wakita, Masahide*; Amano, Hikaru*; Togawa, Orihiko
Nuclear Instruments and Methods in Physics Research B, 268(7-8), p.1219 - 1221, 2010/04
Times Cited Count：9 Percentile：54.12(Instruments & Instrumentation)Dissolved organic carbon (DOC) in seawater is one of the largest reservoirs of organic matter on the earth's surface, holding approximately as much carbon as available in atmospheric CO. As a result of the huge carbon reservoir, the role and dynamics of DOC have become of greater interest in the global carbon cycle. It has been suggested that dissolved organic radiocarbon (
C-DOC) in seawater is a powerful tool to understand the dynamics of DOC and its researches have been carried out using AMS. However, there are very few data in the world oceans because of the difficulties of the measurement technique. Although it has been represented that the western North Pacific plays an important role in the carbon cycle from the viewpoint of a terminal of the deep water circulation in the world oceans and a high biological activity, C-DOC has not been measured yet. In this study, we obtained its vertical profile in the western North Pacific for the first time.
C signaturesOtosaka, Shigeyoshi; Tanaka, Takayuki; Minakawa, Masayuki*
JAEA-Conf 2010-001, p.113 - 117, 2010/03
Transport processes of particulate materials were discussed from elemental and isotopic proxies of seabed sediment, suspended particles and sinking particles collected from northeastern region of the Japan Sea. Isotopic ratios of radiocarbon in suspended/sedimentary organic matter decreased with a horizontal distance from the shelf edge. Assuming that the decrease of the isotopic ratio is due to the radioactive decay of radiocarbon, the authors estimated that suspended particles were transported horizontally through the benthic layer at a speed of 200 m/year.
C measurement at JAEA-AMS-MUTSU; Attempt on a small quantity of sampleTanaka, Takayuki; Kabuto, Shoji; Kinoshita, Naoki; Yamamoto, Nobuo
JAEA-Conf 2010-001, p.122 - 125, 2010/03
In the investigations on substance dynamics using the molecular weight and chemical fractionation, the utilization of C measurement by an accelerator mass spectrometry (AMS) have started. As a result of the fractionation, sample contents required for AMS measurement have been downsized. We expect that this trend toward a small quantity of sample will be steadily accelerated in the future. As C measurement by AMS established at Mutsu office require about 2 mg of sample content at present, our AMS lags behind the others in the trend. We try to downsize the needed sample content for C measurement by our AMS. In this study, we modified the shape of the target-piece in which the sample is packed and which is regularly needed to radiocarbon measurement by our AMS. Moreover, we improved on the apparatus needed to pack the sample. As a result of the improvement, we revealed that it is possible to measure the C using our AMS even by the amount of the sample of about 0.5 mg.
Yamamoto, Nobuo; Kinoshita, Naoki; Kabuto, Shoji; Tanaka, Takayuki
JAEA-Conf 2010-001, p.88 - 91, 2010/03
Tandetron Accelerator Mass Spectrometer in the Japan Atomic Energy Agency Mutsu office (JAEA AMS Mutsu: High Voltage Engineering Europa product, Model 4130-AMS) consists of 3MV tandem type accelerator and the 2 beam lines for measurement of isotope ratio for carbon and iodine. Steady operation of carbon beam line was started in December, 1999 and that of iodine beam line was started in May, 2003. This facility was initially used for studies on transport processes of radionuclides in marine environment. From the fiscal year 2006, this facility became a shared facility to provide data for various projects at JAEA and others. This report describes the status of recent utilization of JAEA AMS MUTSU and the revision of the charge from fiscal year 2010.
Kabuto, Shoji; Kinoshita, Naoki; Tanaka, Takayuki; Yamamoto, Nobuo
JAEA-Conf 2010-001, p.126 - 129, 2010/03
A Tandetron Accelerator Mass Spectrometer (AMS) manufactured by High Voltage Engineering Europa in Netherlands had been set up at the Mutsu office of Aomori Research and Development Center, Japan Atomic Energy Agency (JAEA) in 1997. This AMS features 3MV Tandetron accelerator and two independence beamlines for C and I measurement. This AMS has measured both internal and external JAEA researcher's samples based on an open door policy since April 2006. Furthermore, the total operation time of this AMS from the routine operation started exceeds more than 20,000 hours in this year. In this report, we describe not only the summary of the current status and troubles from the previous symposium but also the upgrading of the operation system in this AMS which is carried out from June to July in 2009.
C concentration in tree rings of beech trees living near CO vents in the Hakkoda Cardera, Aomori, JapanHoriuchi, Kazuho*; Chiba, Takuji*; Hoshino, Yasuharu*; Oyama, Motonari*; Tanaka, Takayuki; Amano, Hikaru*
JAEA-Conf 2010-001, p.71 - 74, 2010/03
We investigated how volcanic CO emission affects the C concentrations in tree rings of beech trees in the Hakkoda Caldera in Aomori, which is one of high emission regions of volcanic CO in the world. There was a tendency that the obtained C concentrations were, surprisingly, quite near to the values of the concurrent atmospheric CO and decreased from 1991 to 2001. The C concentrations in caldera are lower than those of the control samples taken from a beech living outside of the caldera. We revealed the possibility that we can solve the local dynamics of fossil CO emission using C in tree rings. However, the maximum difference of C between inside and outside of the caldera was 14 permil. This result showed that the volcanic CO mixed with atmospheric CO by 4.4 ppm or less. As the trunk absorbing CO exist in height that is several meters higher than the volcanic CO vents, the low mixing may occur.
Otosaka, Shigeyoshi; Suzuki, Takashi; Tanaka, Takayuki
KURRI-KR-153, p.41 - 46, 2010/03
It is considered that recent distribution of anthropogenic radionuclides in the Japan Sea was controlled by supply of the radionuclides due to the global fallout and seawater circulation of the interior of the sea, rather than by a specific nuclear facility/incident. The detailed transport processes, however, have not been elucidated at the present. In this study, the authors surveyed distribution of radiocarbon at 81 stations in the Japan Sea and traced the fate of anthropogenic radiocarbon. As a result, principal transport process of radiocarbon, such as (1) supply from the East China Sea, (2) northward transport at the surface according to the Tsushima Warm Current, and (3) vertical transport in the northwestern region, were confirmed. In addition, the amount of anthropogenic radiocarbon in the sea was estimated by using a simple box-model.
C measurement at JAEA-AMS-MUTSUTanaka, Takayuki; Kabuto, Shoji; Kinoshita, Naoki; Yamamoto, Nobuo
KURRI-KR-153, p.29 - 34, 2010/03
An accelerator mass spectrometry at Mutsu office, Japan Atomic Energy Agency (JAEA AMS MUTSU) was established in 1997 and the routine operation of radiocarbon measurement was started from 1999. The radiocarbon was measured by 1,193 samples last year, and the number of radiocarbon measurements reached 8,809 samples since the routine operation. This AMS has adopted the open door policy for the general users from the fiscal year of 2006 and various researches have been in progress by many users. As a operate system of this AMS had been controlled under Windows 3.1 since installation, it was difficult to purchase spare parts which are compatible with Windows 3.1. The operation system was upgraded to Windows XP in this year. In this presentation, I introduce the current status of JAEA AMS MUTSU, upgrading of the operation system and moreover an extraction method for determination of dissolved organic radiocarbon which was developed in this year.
C measurements between two AMS laboratories of Nagoya University and JAEA MutsuNakamura, Toshio*; Tanaka, Takayuki; Kabuto, Shoji; Ota, Tomoko*
Nagoya Daigaku Kasokuki Shitsuryo Bunsekikei Gyoseki Hokokusho, 21, p.159 - 165, 2010/03
An inter-laboratory comparison of C dating studies with AMS were performed between Nagoya University and JAEA. Two kinds of archeological samples used for the intercomparison were offered from the Education Board of Nirasaki city. One part of them was a charred rice sample with known historical age, which was collected from the ruin of Shimpu-Jo castle remains. The rice was charred when the castle was burnt in 1582, when the castle was abandoned by Katsuyori Takeda during the battle against the combined military forces of Oda and Tokugawa families. The other samples were charred pyrenes of peach and nutshells of Japanese walnut collected from the Shukujiri-Daini-Iseki archeological site. The results from the two AMS laboratories were quite consistent within statistical uncertainties. In addition, calibrated C ages for the charred rice samples were also consistent with the historical age when the Shimpu-Jo castle was burnt down.
Otosaka, Shigeyoshi; Suzuki, Takashi; Tanaka, Takayuki; Ito, Toshimichi; Kobayashi, Takuya; Kawamura, Hideyuki; Minakawa, Masayuki*; Aramaki, Takafumi*; Senju, Tomoharu*; Togawa, Orihiko
JAEA-Data/Code 2009-020, 27 Pages, 2010/02
JAEA-Data-Code-2009-020.pdf:2.45MB
The database for the Japan Sea parameters on marine environment and radionuclides (JASPER) has been established by the Japan Atomic Energy Agency as a product of the Japan Sea Expeditions. By the previous version of the database, data for representative anthropogenic radionuclides were opened to public. And now, data for radiocarbon and fundamental oceanographic properties (salinity, temperature, dissolved oxygen) including nutrients (silicate, phosphate, nitrate and nitrite) are released as the second volume of the database. In the second volume, 20,398 data records are stored including 2,695 data for temperature, 2,883 data for salinity, 2,109 data for dissolved oxygen, 11,051 data for the nutrients, and 1,660 data for radiocarbon. The database will be a strong tool for the continuous monitoring for contamination by anthropogenic radionuclides, studies on biogeochemical cycle, and development and validation of models for numerical simulations in the sea.
Suzuki, Takashi; Otosaka, Shigeyoshi; Tanaka, Takayuki; Kabuto, Shoji; Kinoshita, Naoki; Yamamoto, Nobuo
Dai-22-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.107 - 110, 2010/01
Tandetron Accelerator Mass Spectrometer in the Japan Atomic Energy Agency Mutsu office (JAEA-AMS-Mutsu: High Voltage Engineering Europa product, Model 4130-AMS) consists of 3MV tandem type accelerator and the 2 beam lines for measurement of isotope ratio for carbon and iodine. Steady operation of carbon beam line was started in December, 1999 and that of iodine beam line was started in May, 2003. This facility was initially used for studies on transport processes of radionuclides in marine environment. From the fiscal year 2006, this facility became a shared facility to provide data for various projects at JAEA and others. This report describes the operational situation and a confirmation result of the quality of the measurement data in fiscal year 2008 (April 1, 2008 - March 31, 2009).
