JAEA-Conf 2011-002 - 日本原子力研究開発機構

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JAEA-Conf 2011-002 Figure 1. An example of grouped defect clusters in fusion neutron irradiated Cu to 1.2x10 -4 dpa. Each circle or oval corresponds to one cascade. PKA energy (keV) Figure 2. PKA energy spectrum in Cu and its correspondence to the size of cascade zone. Figure 3. PKA energy spectrum in Cu and its correspondence to the number of produced subcascades from a single PKA.
In the case of most compact cascade such as those produced in Au, with increasing irradiation temperatures, above 473K, well separated subcascades (SFTs) fuse into a large SFT as shown in Fig. 5. Average SFT sizes irradiated at 300K and 473K were 1.6nm and 3.7nm, respectively. Above 623K only few SFTs remained due to their thermal unstableness. The SFT size is larger for larger PKA energy. Figure 6 shows the comparison of defect structures between fusion neutron irradiation (the RTNS-II, 563K, 0.017dpa) and fission neutron irradiation (the JMTR, 573K, 0.044dpa). Though the total displacement damage for the fission neutron irradiation was higher than that of the fusion neutron irradiation, the remaining number of SFTs was higher in the fusion neutron irradiation. The cross-section for the formation of SFTs was 1.7×10 -1 barns and 9.4×10 -4 barns for fusion neutrons and fission neutrons, respectively. The average size of SFTs by fusion neutron irradiation was also larger than that of fission neutron irradiation. If there exists a threshold energy for SFT formation, ESFT, it is evaluated using the following equation, N SFT E d ( E MAX dEp , (1) E SFT dE p p ) JAEA-Conf 2011-002 PKA energy (keV) Figure 4. Variation of the number of subcascades in a group with the PKA energy. where NSFT is the concentration of SFTs observed, α is the SFT formation efficiency. We adopted the cross section calculated by the SPECTER code [5] using the neutron spectrum of the JMTR and RTNS-II as shown in Fig. 7. α and ESFT were obtained to be 0.05 and 80keV, respectively, using the number density of SFTs formed by fission neutron irradiation and fusion neutron irradiation. It is concluded that SFTs are formed for PKA energies larger than 80keV with a cascade efficiency of 0.05 at 563-573K. Actually α depends on the PKA energy, so the value is an average one above 80keV. Figure 5. Temperature dependence of subcascade structures in Au. Ovals indicate one cascade. Above 473 K SFTs formed in a cascade fuse into a large SFT.
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JAEA-Conf 2011-002 Proceedings of t
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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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Acknowledgement We are grateful to
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Beam Line BM1 Copper Target BM2 5×
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φ = φbm · ρtof · ρmulti (2) E
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References [1] K. Ishibashi, H. Tak
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JAEA-Conf 2011-002 hint at the orig
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Neutron Dose Rate [Sv/hr/src neutro
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JAEA-Conf 2011-002 radiation protec
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Ztarget, Atarget are the numbers fo
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We described our formalism for calc
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2. Model
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JAEA-Conf 2011-002
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JAEA-Conf 2011-002 reactions. Figur
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JAEA-Conf 2011-002 Fig. 3. The angu
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analysis of integral experiments [6
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A modified SRAC library was prepare
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JAEA-Conf 2011-002 approximately 0.
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JAEA-Conf 2011-002 constructing the
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Fig.9 Spectrum of gamma-ray followi
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JAEA-Conf 2011-002 in the same way
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JAEA-Conf 2011-002 [7]. For example
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JAEA-Conf 2011-002 For
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JAEA-Conf 2011-002 (5.0-9.0MeV), a
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components, the 0.56Wt% for hydroge
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Sensitivities of curium isotope con
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decreases of (n,g) reaction rates,
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5. Conclusion JAEA-Conf 2011-002 Wi
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2. Foundation of sensitivity analys
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JAEA-Conf 2011-002 where f g and f
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Fig.1 Sensitivity coefficient of th
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An outline of core configurations o
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0.010% 0.000% -0.010% -0.020% -0.03
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To clarify what nuclides and reacti
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Calculation was performed by the MV
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among these libraries, and the diff
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JAEA-Conf 2011-002 - 日本原子力研究開発機構

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