Azimuthal correlations of electrons from heavy-flavor decay with hadrons in and Au+Au collisions at = 200 GeV

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Aramaki, Y.*; et al.

Physical Review C, 83(4), p.044912_1 - 044912_16, 2011/04

https://doi.org/10.1103/PhysRevC.83.044912

Measurements of electrons from the decay of open-heavy-flavor mesons have shown that the yields are suppressed in Au+Au collisions compared to expectations from binary-scaled collisions. Here we extend these studies to two particle correlations where one particle is an electron from the decay of a heavy flavor meson and the other is a charged hadron from either the decay of the heavy meson or from jet fragmentation. These measurements provide more detailed information about the interaction between heavy quarks and the quark-gluon matter. We find the away-side-jet shape and yield to be modified in Au+Au collisions compared to collisions.

Verification of LSD spikes prepared in Japan from a MOX source material

Sumi, Mika; Abe, Katsuo; Kageyama, Tomio; Nakazawa, Hiroaki; Kurosawa, Akira; Yamamoto, Masahiko; Mason, P.*; Neuhoff, J.*; Doubek, N.*; Balsley, S.*; et al.

Proceedings of INMM 51st Annual Meeting (CD-ROM), 9 Pages, 2010/07

Large Size Dried (LSD) spikes are currently used in many facilities in Japan (and around the world) for U and Pu accountancy analysis by Isotope Dilution Mass Spectrometry (IDMS). Because of the large quantity of plutonium standard materials are needed to support Japanese facilities for nuclear fuel cycle and expected difficulties in the long term supply and transport of Pu reference materials, JAEA decided to evaluate the possibility of using MOX stored at Plutonium Fuel Development Center (PFDC) as a source of Pu standard material for LSD spike preparation. At PFDC, Pu nitrate solution was prepared from MOX and two types of the LSD spikes were prepared. The samples of each spike were distributed for verification measurements to international and domestic laboratories. Details of the Pu make-up value evaluation, the LSD spike preparation and the evaluation of the verification results will be presented.

Development of Pu analysis in high active liquid waste (JASPAS JC-13)

; ; Jitsukata, Shu*; Kurosawa, A.; Ikeda, Hisashi

JNC TN8410 2001-017, 75 Pages, 2001/06

JNC-TN8410-2001-017.pdf:1.87MB

It has been required from IAEA to determine a small amount of plutonium in the high active liquid waste solutions (HALW) in the tokai reprocessing plant. High performance spectrophotometer (HPSP), which could be obtained lower detection limit than conventional spectrophotometer, is studied to be applied the inspection and verification analysis. The results of applicability test are described in this report, [Cold Test] Neodymium, showing an absorption peak near the absorption wavelength of plutonium (VI), was used as an alternative element to plutonium, in order to review the calculation method of the peak intensity. [Hot Test] Plutonium nitrate solution was used for the fundamental test of this method. Since the method is known to be influenced by acidity, suspended sludge and coexistent elements in a sample, each dependency was examined. It was found that measurement results varied about 14% at a nitric acid concentration of 2-4 mol/L. Sludge could be removed by filtration before the measurement. The effect of coexisting elements could be eliminated adjusting the optical balance between reference and sample beam intensity. In the case of measuring a low concentration plutonium solution, a ratio of the peak intensity to the background intensity (S/B ratio) was not enough to the measured low concentration of Plutonium. Therefore a method should be improved the S/B ratio by analyzing the obtained spectra. Data accumulation method, simple moving average method and Fourier transform analysis was tested. The results showed that a combination of the accumulated average method and the moving average method was the optimum method fbr the purpose. Linearity of the calibration curve was found between 0-11 mgPu/L. Synthetic sample solution, which simulated the actual constituents of the HALW with plutonium, showed a good linear relation at 0-11 mgPu/L. The detection limit for plutonium concentration was 0.07 mgPu/L. When the synthetic HALW solution containing plutonium was m

Determination of low concentration Pu by liquid scintillation and powdered solid scintillation counting method in spent fuel reprocessing solution

; ; Kurosawa, A.; Ikeda, Hisashi

JNC TN8400 99-026, 48 Pages, 1999/09

JNC-TN8400-99-026.pdf:7.97MB

Application of liquid and powdered solid scintillation alpha-counting method were studied for measurement of low concentration Pu in spent fuel reprocessing plant solution. Principle of those methods is count photons from mixture of scintillator and sample solution. Advantage of those methods is unnecessary of heating by high temperature, which is estimated to be main cause of analytical error and a fire, as the conventional ZnS(Ag) scintillation counting. Since liquid and solid scintillator are treated as a burnable waste, this method is effective concerning of reduction of wastes as well. Liquid scintillation method, whose sample volume is 0.5mL, is confirmed effectiveness for determination of Pu concentration in aqueous sample. Powdered solid scintillation method is applicable both aqueous and organic solutions. It is confirmed that this method is adopted in analysis of reprocessing solution instead of the conventional method. Pu concentration in actual reprocessing sample, 97-1 campaign, were measured by solid scintillation method. Results were agreed with those measured by the conventional method under the good precision. It is achieved sample, accurate and safety analytical procedure by applying powdered solid scintillation method.

None

; ; *; *; Kurosawa, A.

JNC TN8400 99-001, 90 Pages, 1998/09

JNC-TN8400-99-001.pdf:7.74MB

None

JASPAS JC-11(A556); Non-destructive Assay for Uranium and Plutonium in Reprocessing Input Solutions -Hybrid K-edge/XRF Densitometer- (JASPAS JC-11 Final)

Surugaya, Naoki; Abe, Katsuo; Kurosawa, A.; Ikeda, Hisashi ; Kuno, Yusuke

PNC TN8410 97-211, 156 Pages, 1997/05

PNC-TN8410-97-211.pdf:4.1MB

As a part of JASPAS programme, a non-radioactive assay system for the accountability of uranium and plutonium in input dissolver solutions of a spent fuel reprocessing plant, called Hybrid K-edge/XRF Densitometer, has been developed at the Tokai Reprocessing plant (TRP) since 1991. The instrument is the one of the hybrid type combined K-edge densitometry (KED) and X-ray fluorescence (XRF) analysis. The KED is used to determine the uranium concentration and the XRF is used to determine the U/Pu ratio. These results give the plutonium concentration in consequence. It is considered that the instrument has the capability of timely on-site verification for input accountancy. The instrument had been installed in the analytical hot cell at the TRP and the experiments comparing with Isotope Dilution Mass Spectrometry (IDMS) method have been carried out. As the results of measurements for the actual input solutions in the acceptance and performance tests, it was typically confirmed that the precision for determining uranium concentration by the KED was within 0.2%, whereas the XRF for Plutonium performed within 0.7%. This final report summarizes the design information and performance data so as to end the JASPAS programme.

None

Kurosawa, A.; Abe, Katsuo; Kaminaga, Kazuhiro; Kuno, Yusuke; ;

PNC TN8410 93-031, 191 Pages, 1993/03

PNC-TN8410-93-031.pdf:3.91MB

So far, samples have been taken by both Japan Government and the International Atomic Energy Agency (IAEA) from the feed accounting tank of the Reprocessing Plant. Upon transporting the samples, one A-type transport container per batch sample has been required. To simplify the transport of samples, the resin bead technique requiring the trace amounts of samples (several mg for uranium and for plutonium) has been developed with the Oak Ridge National Laboratory, USA being the center. This technique was introduced into the Power Reactor and Nuclear Fuel Development Corporation (PNC) as part of the TASTEX project, and then has been incorporated into the JASPAS project as one of the joint researches between the PNC and the IAEA, in which the PNC has played a leading role. Up to now, joint experiments have been performed seven times, and the resin bead technique may have reached a certain technical level with a few technical problems. In these joint experiments, the PNC prepared and transported samples, whereas the IAEA analysed them. In addition, the PNC has investigated the resin bead technique independently. As mentioned above, the most outstanding merit of the resin bead technique lies in the simplified transport of samples. The technique is also provided with another merit by which uranium and plutonium can be measured without separating them from each other, leading to the necessity of research and development of it on the part of the Reprocessing Plant. This paper describes the results of investigation on the measurement technique of uranium and plutonium by means of the resin bead technique, together with the results from the 3rd to 7th PNC-IAEA joint experiments.