JAEA-Conf 2011-002 - 日本原子力研究開発機構

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JAEA-Conf 2011-002 constructing the decay schemes[1][2] of short-lived nuclides on the basis of the high-resolution -ray measurements. When the -feeding to the highly excited states are overlooked, the E value is underestimated and the E value becomes too large. Recently, TAGS was successfully applied to measure some of the most important FP nuclides in the decay-heat calculation for Pu-239. This series of the new TAGS measurement was initiated by a European group, and a part of their novel result was published very recently [3]. We plan to include these new TAGS data eventually into JENDL (Japanese Evaluated Nuclear Data Library). This procedure needs not only the average energies but also the energy spectra of the -rays and the-particles. But the TAGS data consist only of the -feeding rates into energy-bins of the excited stats of the daughter with finite width. So we have to estimate the energy spectra with the aid of theoretical consideration along with the TAGS results. On this context, the present study aimes at establishing a way to estimate the energy spectra with combined knowledge of the TAGS -feedings and the -decay and the-decay theories. 2 . Comparison of European TAGS and Current Data On the long-range point of view over decades of years, introducing the Gross theory into the FP decay heat calculations[4] was thought to be a provisional treatment. It was expected that the theoretical values of E and E for important FPs would gradually be replaced by the data firmly based on some certain and reliable measurements which would be free from the pandemonium problem. Having this long-standing anticipation as a background, they stated the TAGS measurement led by a group of Valencia[5]. This measurement is able to detect all the -feedings into the whole range of daughter’s excitation energy up to the Q -value itself. Their results are shown in Figs. 1 ~ 7 along with the current data. The -feeding from Tc-104 to Ru-104 are compared between the TAGS and Table of Isotopes[1] in Fig. 3 among others. The TAGS data provide us only with the -feedings into energy-bins representing the excitation energies of the daughter, or Ru-104. In this case, the TAGS supports the presence of the structures in the -feedings, which the current data vaguely indicates. Further, the TAGS data provide us with the feedings up to much higher in the exciting energy, where the current decay scheme gives us no information. So, we adopt the data as it is in the energy range where the current level schemes say nothing. 3. Gamma energy spectrum calculation When we introduce the decay data into the JENDL decay data file, we need not only the average energies of the -rays and the -particles but also the -feeding rate and the energy spectra of the radiations. Figure 8 shows the calculated -ray spectra starting from the TAGS -feeding to the whole energy range from 0 (ground sate) to Q (the highest
possible energy). On the other hand, Fig.9 shows the calculated spectra originating from the TAGS -feeding to the high-energy part where no current decay schemes give us any information, in other words, only the latest TAGS measurement provides us with the -feedings. Figure 1014 show the-ray energy spectra calculated in the same way as in Fig.9. In these calculations, we used a computer code to calculate the -ray energy spectrum from a set of -feedings, which was modeled and coded by Yoshida and Katakura [6]. This model is based on a simple -cascade with the Gilbert-Cameron level-density formula and the Brink-Axel giant dipole resonance. JAEA-Conf 2011-002
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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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Page 192 and 193: analysis of integral experiments [6
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JAEA-Conf 2011-002
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JAEA-Conf 2011-002 - 日本原子力研究開発機構

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