JAEA-Conf 2011-002 - 日本原子力研究開発機構

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JAEA-Conf 2011-002 Figure 2 shows experimental and calculated double-differential (n,xp) cross sections from 20° to 140° in steps of 40°. The experimental data are plotted by closed circles, showing a strong angular dependence at high emission energies above 20 MeV. The solid curves present the GNASH calculations with the IHS model. The calculations reproduce generally well the measured spectra except for 20°. The calculations underestimate the experimental data from 110 MeV to high-energy end at 20°. In Fig.3, experimental and calculated double-differential (n,xα) cross sections are shown at 20°, 60°, 80° and 120°. The experimental data are plotted by closed circle. The dashed curves denote the calculations of the GNASH code with the IHS model with ΔR =1.0 fm. These calculations underestimate the measured spectra above 30MeV at all angles, especially at 20°. We have paid attention to the ΔR parameter used in the IHS model to improve this underestimation. According to the recent IHS model analysis [15], ΔR was found to have the energy dependence. Therefore, the energy-dependence was investigated on the basis of the analyses of Al(p,xα) data over the wide energy range up to 200 MeV [21-24], because Al is an adjacent nucleus to Si. We have determined an optimum ΔR value for each experimental data under the condition that ΔR is less than 1.6 fm corresponding to alpha-particle’s radius. As shown in Fig.4, the deduced ΔR values are nearly 1.1 fm in the incident energy range below 70 MeV [23,24] close to the original values, 1.0 fm, whereas they are more than 1.4 fm in the incident energy range above 120 MeV [21,22]. Finally the energy-dependence of the ΔR parameter was obtained by fitting each ΔR value with the Woods-Saxon function as shown by the solid curve in Fig.4. The energy-dependent ΔR starts to increase gradually from nearly 70 MeV and approaches to 1.6 fm in the energy range of more than 160 MeV. The calculations with the energy–dependent ΔR parameter are shown by the solid curves in Fig.3, reproducing the measured data better than the original calculations with ΔR=1.0 fm. This suggests that the use of the energy-dependent ΔR parameter is necessary in the IHS model calculations for incident energies above 70 MeV. Fig. 2 Comparison between measured (n,xp) spectra from 20° to 140° in steps of 40° and calculation results of GNASH code with IHS model.
JAEA-Conf 2011-002 Fig. 3 Comparison between measured (n,xα) spectra at 20°, 60°, 80° and 120° and calculation results of GNASH code with IHS model. The dashed curves denote the calculation results with ΔR=1.0 fm. The solid curves present the calculation result using the energy-dependent ΔR parameter given in Fig.4. Fig. 4 Energy-dependence of ΔR parameter. Each symbol shows optimum ΔR parameter determined for each experimental data. The solid curve denotes the result of fitting with the Woods-Saxon function.
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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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Page 88 and 89: The Institute's staff of about 280
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Page 96 and 97: Using the approximated distribution
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Page 148 and 149: JAEA-Conf 2011-002 The new detector
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Page 156 and 157: Acknowledgement We are grateful to
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JAEA-Conf 2011-002
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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
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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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