JAEA-Conf 2011-002 - 日本原子力研究開発機構

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JAEA-Conf 2011-002 [7]. For example, Table1 shows that Tc-102, whose -feeding to the ground state is very large, proved to be free from the pandemonium problem, in other words, the current high-resolution data (ENDF/B-VII) and the UDV/TAGS give almost the same values for E and E.. 3.2. Important Nuclides for U-235 Decay Heat Here we propose a list of nuclides to be measured in the future TAGS program focusing our attention on the improvement of decay heat summation calculation for U-235. This study uses JENDL/FPD-2000 and the Evaluated Nuclear Structure Data File [8] (ENSDF). The library JENDL/FPD-2000 covers information on the decay data of 1229 fission products. This is used to search for the nuclides that contribute much to the decay heat of U-235. Detailed data of the searched nuclides (half-life, Q-value, and released energies etc.) are obtained from ENSDF. We examine whether the pandemonium-problem influences the selected nuclides from these data library, and evaluating the priority of the future TAGS measurements. The points for selecting nuclides and deciding the priority are as follows. i) The difference between the highest known level and Q-value. When the difference is large, the nuclide has a large possibility of missing of the -feeding to the high energy regions of the daughter nuclide in the current decay schemes by influence of the pandemonium-problem. ii) The unplaced gammas. The primary cause of pandemonium-problem is that a lot of rays, though detected, failed to find their correct places in the complex decay scheme (unplaced gamma). The unplaced gammas can be confirmed by ENSDF. For example, Xe-141 has extremely many and high energy unplaced gammas. There are as many as 185 unplaced -rays besides 96 -rays which are correctly positioned in the complex decay scheme of Cs-141, its daughter nuclide. iii) Contribution to the Pu-239 decay heat. Calculation of the decay heat for Pu-239 is in a good agreement with the sample-irradiation measurements for the sake of the recent TAGS activity [5]. Therefore, when a nuclide’s contribution to the decay heat of Pu-239 is large, it is reliable and not selected for the future TAGS measurements. However, this principle is not applied for the nuclides whose contribution to the decay heat for Pu-239 in the cooling-time range 200 – 10,000s is large. In this cooling-time range the disagreement still remains between the calculation and the measurements.
Table.2 lists the highest priority nuclides that are selected here. These nuclides are important in order to improve the disagreement between the summation calculation and the sample-irradiation measurement in U-235 decay heat. Table 2 High priority list of the future TAGS measurements for U-235 Decay Heat JAEA-Conf 2011-002 *1 (B) / (A): ratio of the energy of the highest known level to the Q-value *2 Cooling time: cooling time when the nuclide gives the maximum contribution *3 U-235: The nuclide’s contribution to the total decay heat of U-235 *4 Pu-239: The nuclide’s contribution to the total decay heat of Pu-239 4. Conclusion Here we propose a list of nuclides to be measured in the future TAGS program focusing our attention on the U-235 decay heat. It is necessary to revalue the mean - and -ray energies of these nuclides for the better agreement between the summation calculations and the sample-irradiation measurements without introducing theoretical calculations. European group is trying to be still active after finishing TAGS measurements for Pu-239. We expect they could measure the nuclides listed here for U-235 in the near future. Reference [1] A. Algora et al., Int. Comf. Nucl. Data to Sci. and Technol., Jeju, Korea (2010) [2] T. Yoshida, R. Nakashima, J. Nucl. Sc;. Technol., 18[6] (1981) 393-407 [3] R.C. Greenwood et al., Nucl. Instrum. Methods, A314 (1992) 514-540 [4] N. Hagura et al., J. Nucl. Sci. Technol., 43[5] (2006) 497-504 [5] A. Algora et al., Phys. Rev. Lett., 105 (Nov., 2010) 202501 [6] http://www.oecd-nea.org/science/wpec/index.html [7] N.Hagura et al., J. Nucl. Sci. Technol., 47[5] (2010) 492-500 [8] http://www.nndc.bnl.gov/ensdf/
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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 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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eports of data of carbon-ion incide
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Count [-] 4 10 3 10 2 10 10 1 Charg
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