JAEA-Conf 2011-002 - 日本原子力研究開発機構

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Neutron Dose Rate [Sv/hr/src neutron] 1E-9 1E-10 1E-11 1E-12 1E-13 1E-14 1E-15 0 50 100 150 200 250 300 Concrete Thickness [cm] Neutron emission angle: 0 0 PHITS FLUKA Fig 5. Neutron dose rate at the emission angle of 0 0 Neutron Dose Rate [Sv/hr/src neutron] 1E-9 1E-10 1E-11 1E-12 1E-13 1E-14 1E-15 0 50 100 150 200 250 300 Concrete Thickness [cm] Neutron emission angle: 60 0 PHITS FLUKA JAEA-Conf 2011-002 Neutron Dose Rate [Sv/hr/src neutron] Neutron Dose Rate [Sv/hr/src neutron] 1E-9 1E-10 1E-11 1E-12 1E-13 1E-14 1E-15 0 50 100 150 200 250 300 Concrete Thickness [cm] Neutron emission angle: 30 0 PHITS FLUKA Fig 6. Neutron dose rate at the emission angle of 30 0 1E-9 1E-10 1E-11 1E-12 1E-13 1E-14 1E-15 0 50 100 150 200 250 300 Concrete Thickness [cm] Neutron emission angle: 90 0 PHITS FLUKA Fig 7. Neutron dose rate at the emission angle of 60 0 Fig 8. Neutron dose rate at the emission angle of 90 0 [1] Koji Niita, Tatsuhiko Sato, Hiroshi Iwase, Hiroyuki Nose, Hiroshi Nakashima, and Lembit Sihver, “PHITS – a particle and heavy ion transport code system,” Radiation Measurements 41, 1080-1090 (2006). [2] Koji Niita, et. Al., “Nuclear Reaction Models in Particle and Heavy ion Transport code System, PHITS,” Proc. First International Workshop on Accelerator Radiation Induced Activation, Oct. 13-17, 2008, PSI, Switzerland (2008) [3] Alfredo Ferrari, Paola R. Sala, Alberto Fass`o and Johannes Ranft, “FLIKA: a muliti-particle transport code,” CERN-2005-010, CERN (2005) [4] F. Ballarini, et. Al., “The FLUKA code: an overview,” Journal of Physics, Conference Series 41, 151-160 (2006) [5] Takasi Nakamura and Lawrence Heilbronn, Handbook on Secondary Particle Production and Transport by High-energy Heavy Ions, World Scientific, 13-16 (2006).
JAEA-Conf 2011-002 Yosuke IWAMOTO 1 , Koji NIITA 2 , Tomotsugu SAWAI 1 , R.M. RONNINGEN 3 , Thomas BAUMANN 3 1 Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195 Japan 2 Research Organization for Information Science and Technology, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195 Japan 3 National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 U.S.A. e-mail: iwamoto.yosuke@jaea.go.jp Radiation damage in solids caused by various particles in wide range of energy is measured in a common unit, DPA (Displacement per Atom). The DPA model in the Particle and Heavy Ion Transport code System (PHITS) has recently been developed using Coulomb scattering to evaluate the energy of target PKA’s created by the projectile and the secondary from nuclear reactions. For the Coulomb scattering, a universal one-parameter differential scattering cross section equation introduced by J. Lindhard et. al. is employed. The number of displacements in a cascade damage caused by a PKA was evaluated by the NRT model. We compared PHITS results for the 130 MeV/u 76 Ge and proton into W reactions with calculated results of TRIM, which is widely used and cannot treat nuclear reactions. PHITS gives good agreements with TRIM results for DPA values by PKA’s directly created by the projectile such as 76 Ge and proton. On the other hands, for the proton incident reaction, PKA’s created by the secondary particles is more dominant than PKA’s by the projectile in DPA calculations. Therefore, TRIM leads to sever underestimation where projectile energy is high enough to create nuclear reactions. PHITS is more reliable code than TRIM for DPA calculations, especially in the high-energy region and proton incidence. As the power of proton and heavy-ion accelerators is increasing, the prediction of the structural damage to materials under irradiation is essential. The average number of displaced atoms per atom of a material DPA serves as its quantitative measure: DPA=t where is the radiation damage cross section; and t is the irradiation fluence, i.e., the product of the ion beam density and the bombardment time. The level of the radiation damage in DPA units is used, for example, to estimate radiation damage of the target and magnet material for heavy-ion and proton incident reactions in Rare Isotope Beam Facility (FRIB) [1] and J-PARC facility [2]. Since Particle and Heavy Ion Transport code System (PHITS) [3] was used for the
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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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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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