JAEA-Conf 2011-002 - 日本原子力研究開発機構

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JAEA-Conf 2011-002 We measured double-differential TTYs of neutrons and -rays from various thick targets at nine laboratory angles (0, 15, 30, 45, 60, 75, 90, 120, and 150°). The incident beam was 18 MeV protons and fully stopped in the target. The experimental TTY data were obtained at energies above 1.5 MeV for neutrons and 0.6 MeV for -rays. The TTY spectra have high-energy neutrons up to 16 MeV. The measured energy and angular distributions were compared with calculations by the MCNPX based on the LA150, TENDL-2009, and Bertini + Dressner model. For the neutron energy distributions, the calculated results agreed fairly well with the experimental data, except some spectra at backward directions. The MCNPX calculation of -ray spectrum result generally well reproduces the measured energy spectra except for the some peaks shown in the measured results. [1] R. Méndez, M. P. Iñiguez, J. M. Martí-Climent, I. Peñuelas, H. R. Vega-Carrillo and R. Barquero, Phys. Med. Biol., , 5141-5152 (2005). [2] K. Niita, N. Matsuda, Y. Iwamoto, H. Iwase, T. Sato, H. Nakashima, Y. Sakamoto and L. Sihver, JAEA-Data/Code 2010-022 (2010). [3] M. B. Chadwick, P. G. Young, S. Chiba, S. C. Frankle, G. M. Hale, H. G. Hughes, A. J. Koning, R. C. Little, R. E. MacFarlane, R. E. Prael, and L. S. Waters, Nucl. Sci. Eng., , 293 (1999). [4] Y. Iwamoto, Y. Sakamoto, N. Matsuda, Y. Nakane, K. Ochiai, H. Kaneko, K. Niita, T. Shibata and H. Nakashima, Nucl. Instr. and Meth. A, , 687-695 (2009). [5] J. F. Ziegler, J. P, Biersack, U. Littmark, The Stopping and Range of Ions in Solids Pergamon Press, New York (1984). [6] K.Omata and Y.Hujita, INS-Rep-884, Institute for Nuclear Study, University of Tokyo, 1991. [7] S. Meigo, Nucl. Instrum. Methods in Physics Research 365 (1997) [8] K. Shin, Y. Uwamino and T. Hyodo, Nucl. Technol., (1981) 78. [9] W.Nelson, H.Hirayama, D.W.O.Rogers, “The EGS4 Code System” SLAC-265, Stanford University, Stanford (1985). [10] A.J. Koning, D. Rochman, TENDL-2009: consistent TALYS-based Evaluated Nuclear Data Library including covariance data, OECD/NEA JEF/DOC-1310, November 2009, http://www.talys.eu/tendl-2009. [11] H. W. Bertini, Phys. Rev., , 1711 (1969) [12] L. Dresner, ORNL-TM-196, Oak Ridge National Laboratory (1962).
Shusuke HIRAYAMA 1 , Yukinobu WATANABE 1 , Yuuki NAITOU 1 , Pernilla ANDERSSON 2 , Riccardo BEVILACQUA 2 , Cecilia GUSTAVSSON 2 , Anders HJALMARSSON 3 , Michael ÖSTERLUND 2 , Stephan POMP 2 , Alexander PROKOFIEV 3 , Vasily SIMUTKIN 2 , Henrik SJÖSTRAND 2 , Milan TESINSKY 4 , Udomrat TIPPAWAN 5 and Satoshi KUNIEDA 6 1 Department of Advanced Energy Engineering Science, Kyushu University, Kasuga, Fukuoka 816-8580, Japan 2 Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden 3 The Svedberg Laboratory, Uppsala University, Box 533, SE-751 21 Uppsala, Sweden 4 Department of Nuclear and Reactor Physics, Royal Institute of Technology, 106 91 Stockholm, Sweden 5 Plasma and Beam Physics Research Facility, P.O.Box 217, 50200, Thailand 6 Nuclear Data Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan Email: hirayama@aees.kyushu-u.ac.jp We have measured double differential cross sections of protons and alphas produced from silicon induced by 175 MeV quasi mono-energetic neutrons using the Medley setup at the TSL neutron beam facility in Uppsala University. The measured data are analyzed using the exciton model incorporating the Iwamoto-Harada-Sato (IHS) coalescence model, with particular attention to the energy dependence of the pick-up radius parameter ΔR in the IHS model. Recently, single event effects (SEEs) caused by cosmic-ray neutrons in logic and memory circuits have been recognized as a key reliability concern for modern microelectronic devices. When electronic memory circuits are exposed to neutron radiation, secondary ions are produced by nuclear interaction with atomic nuclei in materials. The released charge can cause a flip of the memory information in a bit, which is called a single-event upset (SEU). Recent work has elucidated that the contribution from secondary light ions (i.e., p, d, t, 3 He and α) to SEU becomes increasingly important as the size of microelectronic devices becomes smaller and smaller [1,2]. Therefore, reliable nuclear data for neutron-induced light ion production over a wide incident energy range are strongly required to simulate accurately the SEEs including SEU. However, there is no measurement for silicon target in the energy range of more than 100 MeV. In the present work, we have measured double-differential production cross section of p, d, t, 3 He, and from silicon bombarded by 175 MeV quasi mono-energetic neutrons. The experimental data are compared with the exciton model calculations in which we use the surface coalescence model proposed by Iwamoto, Harada, and Sato [3]. The results of proton and alpha production are reported in this paper. JAEA-Conf 2011-002 Details of the experimental set up have been reported in Refs.[4,5]. A thin silicon target placed in the Medley chamber was irradiated by quasi mono-energetic neutrons generated by the 7 Li(p,n) 7 Be reaction. The target consisted of double silicon wafer discs and its size was 0.96mm thick and 25 mm in diameter. Energy and angular distributions of light-ions produced from the silicon target were measured with the Medley setup. The Medley setup was composed of eight telescopes placed at angles from 20° to 160° in steps of 20°. Each telescope consisted of two silicon surface barrier detectors (50~60 μm and 1000 μm) as the ΔE detector and a CsI(Tl) detector as the E detector. Moreover, the incident neutron spectrum was measured using the same setup with both 5mm-thick polyethylene (CH2) target 25mm in diameter and
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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 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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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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