JAEA-Conf 2011-002 - 日本原子力研究開発機構

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JAEA-Conf 2011-002 34. Improvements of FP Decay Heat Summation Calculations by Introducing TAGS Data II. Priority Proposal for Future Measurements Takayuki ARAI and Tadashi YOSHIDA Tokyo City University, Tamazutsumi 1-28-1, Setagaya-ku, 158-8557 Tokyo, Japan E-mail: g1181002@tcu.ac.jp Summation calculations of fission-product (FP) decay heat for U-235, which do not agree well with sample-irradiation measurements, suffer from the pandemonium-problem. Decay data taken by a total absorption gamma-ray spectrometer (TAGS) is expected to be free from this problem. Therefore TAGS is, at least at present, an ideal source of the FP decay data to be used for calculating the mean-ray and -ray energies of individual FP nuclides, and it can solve the discrepancy between calculations and measurements in the FP decay heat calculations. Here we propose a list of nuclides to be measured in the future TAGS program focusing our attention on the improvement of the decay heat summation calculation for U-235. 1. Introduction The FP decay-heat summation calculations without any theoretical correction do not reproduce well the sample-irradiation measurements for U-235 [1]. This is because the decay-data of the individual FP nuclides contributing much to the U-235 decay-heat suffer from the pandemonium-problem. The pandemonium-problem is caused by missing -feedings to the high energy regions of the daughter nuclides in the current decay schemes. As a result, the mean -ray energy per decay (E) is overvalued and the mean -ray energy (E) is undervalued. This leads to the failure of the summation calculations [2]. In the case of JENDL of Japan and ENDF/B-VI of America, the gross theory of beta decay was introduced for supplementing the calculation of E and E in order to cope with the pandemonium-problem and, then, they lead to a good agreement between the calculations and the measurements. On the other hand, JEFF of Europe dose not introduce any theoretical correction for the decay data for the summation calculations. Therefore, the overvaluation of E and the undervaluation of E are clearly identified in JEFF, which explicitly demonstrate the presence of the pandemonium-problem as a result. The latest calculation based on ENDF/B-VII does not agree with the sample-irradiation measurements
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JAEA-Conf 2011-002 Proceedings of t
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JAEA-Conf 2011-002 31. Preliminary
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6.2 Measurement of neutron-induced
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JAEA-Conf 2011-002 Table 1 Comparis
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JAEA-Conf 2011-002 (T1/2=8,900,000
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JAEA-Conf 2011-002 Though words too
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JENDL-3.3 showed better applicabili
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ENDF. Thus this cross section store
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Acknowledgement JAEA-Conf 2011-002
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In the MALIBU program, isotope conc
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some minor actinides. For major act
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JAEA-Conf 2011-002 code MVP-BURN an
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JAEA-Conf 2011-002 [3] Measurements
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3.1 Experimental Set up JAEA-Conf 2
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References JAEA-Conf 2011-002 [1] N
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JAEA-Conf 2011-002 was large. The a
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JAEA-Conf 2011-002 4. Results and D
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Acknowledgments Present study inclu
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Fig. 1 A conceptural picture of the
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4. Theoretical studies Theoretical
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JAEA-Conf 2011-002 Fig.9 Comparison
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Ion source JAEA-Conf 2011-002 LE
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JAEA-Conf 2011-002 3. Readiness
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JAEA-Conf 2011-002
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JAEA-Conf 2011-002 Figure 1. An exa
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JAEA-Conf 2011-002 Figure 6. Compar
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JAEA-Conf 2011-002 calculation of d
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JAEA-Conf 2011-002 equilibrium emis
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JAEA-Conf 2011-002 Cowley et al. [1
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4. Conclusions We have compared nuc
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of MeV region with highest cosmic-r
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JAEA-Conf 2011-002 events can be id
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JAEA-Conf 2011-002 models and its p
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JAEA-Conf 2011-002
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JAEA-Conf 2011-002
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JAEA-Conf 2011-002 xx
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JAEA-Conf 2011-002 1. The recent ac
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JAEA-Conf 2011-002 4. Conceptual de
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The Institute's staff of about 280
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3. Nuclear Theory Laboratory JAEA-C
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JAEA-Conf 2011-002 References [1] P
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JAEA-Conf 2011-002 reaction 6 Li +
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Using the approximated distribution
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momentum of the constituents of P.
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dσ/dΩ (mb/sr) c.m. scattering ang
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JAEA-Conf 2011-002 [2] N. Austern,
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moderating fast neutrons emitted fr
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JAEA-Conf 2011-002 3. Results and d
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JAEA-Conf 2011-002 the detection de
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Fig.1. Experimental arrangement for
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in this work was confirmed. (2) 153
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Neutron Capture Cross Section of 15
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ENDF resonance parameters are based
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sample changer. The measured flux s
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REFERENCES JAEA-Conf 2011-002 [1] W
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JAEA-Conf 2011-002 Fig. 4: The rela
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Fig. 10: The PHITS2 calculation geo
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for such a low energy region should
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MCNPX calculation was performed bas
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JAEA-Conf 2011-002 We measured dou
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1mm-thick carbon target 22mm in dia
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JAEA-Conf 2011-002 Figure 2 shows e
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The double-differential (n,xp) and
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JAEA-Conf 2011-002 forward angles.
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Fig.3. Two-dimensional plot of PI v
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JAEA-Conf 2011-002 Fig. 7. Deuteron
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JAEA-Conf 2011-002 The new detector
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4. Off line data analysis Double di
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Page 192 and 193: analysis of integral experiments [6
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