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Sim, Hasung,Lee, Seongsu,Hong, Kun-Pyo,Jeong, Jaehong,Zhang, J. R.,Kamiyama, T.,Adroja, D. T.,Murray, C. A.,Thompson, S. P.,Iga, F.,Ji, S.,Khomskii, D.,Park, Je-Geun American Physical Society 2016 Physical Review B Vol.94 No.19
<P>DyB4 has a two-dimensional Shastry-Sutherland (Sh-S) lattice with strong Ising character of the Dy ions. Despite the intrinsic frustrations, it undergoes two successive transitions: a magnetic ordering at T-N = 20K and a quadrupole ordering at T-Q = 12.5K. From high-resolution neutron and synchrotron x-ray powder diffraction studies, we have obtained full structural information on this material in all phases and demonstrate that structural modifications occurring at quadrupolar transition lead to the lifting of frustrations inherent in the Sh-S model. Our paper thus provides a complete experimental picture of how the intrinsic frustration of the Sh-S lattice can be lifted by the coupling to quadrupole moments. We show that two other factors, i.e., strong spin-orbit coupling and long-range Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction in metallic DyB4, play an important role in this behavior.</P>
T. Kin,K. Furutaka,S. Goko,H. Harada,A. Kimura,F. Kitatani,S. Nakamura,M. Ohta,M. Oshima,Y. Toh,J. Hori,M. Igashira,T. Katabuchi,M. Koizumi,M. Mizumoto,T. Kamiyama,K. Kino,Y. Kiyanagi 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
A ``4π germanium spectrometer'' was developed for measurements of neutron capture cross sections of minor actinides and long-lived fission products. It was installed on the Beam Line No. 04 of the Materials and Life Science Experimental Facility of the Japan Proton Accelerator Research Complex. The time-of-flight method is used to measure the cross sections. To obtain characteristics of the spectrometer, a measurement was done of prompt gamma rays emitted following neutron capture reactions of gold whose cross section was well studied. In the present paper, we show the procedure of analysis of the data obtained with the spectrometer and discuss the characteristics to measure neutron capture cross section.
Measurements of Neutron-Capture Cross Sections of Palladium Isotopes at the J-PARC/MLF/ANNRI
S. Nakamura,K. Furutaka,S. Goko,H. Harada,A. Kimura,T. Kin,F. Kitatani,M. Koizumi,M. Ohta,M. Oshima,Y. Toh,J. Hori,T. Fujii,S. Fukutani,K. Takamiya,M. Igashira,T. Katabuchi,M. Mizumoto,T. Kamiyama,K. 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The operation of a new experimental apparatus called ``Accurate Neutron-Nucleus Reaction measurement Instrument (ANNRI)''in the Material and Life science experimental Facility (MLF) at the Japan Proton Accelerator Research Complex (J-PARC) has been started for neutroncapture crosssection measurements of minor actinides and long-lived fission products. As a part of the measurements, we have measured the time-of-flight spectra of palladium-105, 106, 107 and 108 with a ``4π Ge spectrometer'' installed at the ANNRI. We obtained preliminary results of the cross sections for palladium-107 and 105 in neutron energies ranging from 0.1 eV to 300 eV.
Y. Kiyanagi,K. Kino,M. Furusaka,F. Hiraga,T. Kamiyama,K. Kato,M. Igashira,T. Katabuchi,M. Mizumoto,M. Oshima,H. Harada,J. Katakura,K. Furutaka,S. Goko,A. Kimura,T. Kin,F. Kitatani,M. Koizumi,S. Nakamu 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
A project on the comprehensive nuclear data research for the development of the advanced reactor systems had been executed successfully by eight organizations from 2005 to 2009. In this project, we constructed a pulsed neutron beamline that was aimed to obtain neutron capture cross-sections of long-lived fission products and minor actinides accurately. The energy spectra, spatial distributions, and pulses of the beam were studied by measurements and simulation calculations, and they were found to be consistent with those of the beamline design. In this paper, we present the overview of the project and the properties of the neutron beam provided by this beam line.
J. Hori,K. Furutaka,S. Goko,H. Harada,A. Kimura,T. Kin,F. Kitatani,M. Koizumi,S. Nakamura,M. Ohta,M. Oshima,Y. Toh,M. Igashira,T. Katabuchi,M. Mizumoto,T. Kamiyama,K. Kino,Y. Kiyanagi 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The prompt gamma rays from the neutron capture reactions by ^(91)Zr and ^(96)Zr were measured. A neutron time-of-flight (TOF) method was adopted with a 4π Ge spectrometer installed at the Accurate Neutron-Nucleus Reaction measurement Instrument (ANNRI) in the J-PARC Material and Life science experimental Facility (MLF). The gamma-ray pulse-height spectra corresponding to the 292-eV resonance of ^(91)Zr and the 301-eV resonance of ^(96)Zr were obtained by gating on the TOF regions, respectively. The relative intensities of those transitions were derived. Moreover, we have demonstrated the nuclide discrimination technique by identifying ^(91)Zr resonances (isotopic composition of 5.3%) in the measurement of ^(96)Zr sample This technique can be applicable to the neutron capture measurement for a small amount of sample expected in case of long-lived fission products (LLFPs) such as ^(93)Zr.
Measurements of Neutron-Capture Cross Sections of ^(244)Cm and ^(246)Cm at J-PARC/MLF/ANNRI
A. Kimura,K. Furutaka,S. Goko,H. Harada,T. Kin,F. Kitatani,M. Koizumi,S. Nakamura,M. Ohta,M. Oshima,Y. Toh,T. Fujii,S. Fukutani,J. Hori,K. Takamiya,M. Igashira,T. Katabuchi,M. Mizumoto,T. Kamiyama,K. 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
For developments of innovative nuclear reactors, strong demands exist for the improvement of the accuracy of the neutroncapture cross sections of minor actinides (MAs) and long-lived fission products. We have constructed a Ge-spectrometer using the Accurate Neutron-Nucleus Reaction measurement Instrument (ANNRI) in the J-PARC materials and life science experimental facility (MLF). Preliminary neutroncapture cross sections of ^(244)Cm and ^(246)Cm were obtained in the neutron energy range from 1.0 eV up to 300 eV.
Study of Neutron Capture Reactions Using the 4π Ge Spectrometer
H. Harada,S. Goko,A. Kimura,M. Ohta,M. Oshima,F. Kitatani,M. Igashira,T. Katabuchi,M. Mizumoto,T. Ohsaki,J. Hori,T. Fujii,K. Takamiya,J. Goto,Y. Kiyanagi,K. Kino,M. Furusaka,F. Hiraga,T. Kamiyama 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The 4π Ge spectrometer composed of 22-30 Ge detectors was developed, and it has been used to study neutron capture reactions with a neutron time-of-flight (TOF) technique. Since the distances between the sample position and the Ge detectors are variable, it can be used as a multifunctional spectrometer. At first, it was used as a sum energy spectrometer, and resonances in ^(nat)Ag were identified as those of ^(1070Ag or ^(109)Ag. In second, it was used to deduce γ-ray intensity distribution for each resonance, and the results for ^(238)U were presented. In third, it was used to measure neutron capture cross sections of minor actinides and fission products at the electron linear accerelator facility of KURRI and at the accurate neutron-nucleus reaction measurement instrument (ANNRI) in MLF of J-PARC The preliminary results are discussed mainly based on measurements of neutron capture cross section for ^(241)Am, together with related techniques.