JAEA-Conf 2011-002 - 日本原子力研究開発機構

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JAEA-Conf 2011-002 [2] N. Austern, Y. Iseri, M. Kamimura, M. Kawai, G. Rawitscher, and M. Yahiro, Phys. Rep. 154, 125 (1987) [3] N. Austern, M. Yahiro, and M. Kawai, Phys. Rev. Lett. 63, 2649 (1989); N. Austern, M. Kawai, and M. Yahiro, Phys. Rev. C 53, 314 (1996). [4] R. A. D. Piyadasa, M. Kawai, M. Kamimura, and M. Yahiro, Phys. Rev. C 60, 044611 (1999). [5] T. Matsumoto, E. Hiyama, K. Ogata, Y. Iseri, M. Kamimura, S. Chiba, and M. Yahiro, Phys. Rev. C 70, 061601(R) (2004). [6] E. Hiyama, Y. Kino, and M. Kamimura, Prog. Part. Nucl. Phys. 51, 223 (2003). [7] T. Matsumoto, T. Egami, K. Ogata, Y. Iseri, M. Kamimura, and M. Yahiro, Phys. Rev. C 73, 051602(R) (2006). [8] M. Rodríguez-Gallardo, J. M. Arias, J. Gómez-Camacho, A. M. Moro, I. J. Thompson, and J. A. Tostevin, Phys. Rev. C 80, 051601(R) (2009). [9] Y. Suzuki and K. Ikeda, Phys. Rev. C 37, 410 (1988); A. Aoyama, T. Myo, K. Katō, and K. Ikeda, Prog. Theor. Phys. 116, 1 (2006). [10] T. Egami, T. Matsumoto, K. Ogata, and M. Yahiro, Prog. Theor. Phys. 121, 789 (2009). [11] J. Aguilar and J. M. Combes, Commun. Math. Phys. 22, 269 (1971); E. Balslev and J. M. Combes, Commun. Math. Phys. 22, 280 (1971). [12] T. Matsumoto, K. Katō, and M. Yahiro, Phys. Rev. C 82, 051602(R) (2010). [13] F. A. Brieva and J. R. Rook, Nucl. Phys. A 291, 299 (1977); ibid. 291, 317 (1977); ibid. 297, 206 (1978). [14] K. Minomo, K. Ogata, M. Kohno, Y. R. Shimizu, and M. Yahiro, J. Phys. G 37, 085011 (2010). [15] T. Furumoto, Y. Sakuragi, and Y. Yamamoto, Phys. Rev. C 79, 011601(R) (2009). [16] T. Furumoto, Y. Sakuragi, and Y. Yamamoto, Phys. Rev. C 78, 044610 (2008). [17] H. Sakaguchi et al., Phys. Rev. C 26, 944 (1982). [18] F. T. Baker et al., Nucl.Phys.A393, 283 (1983). [19] S. Hashimoto, K. Ogata, S. Chiba, and M. Yahiro, Prog. Theor. Phys. 122, 1291 (2009). [20] T. Ye, Y. Watanabe, and K. Ogata, Phys. Rev. C 80, 014604 (2009). [21] M. Hagiwara et al., Fusion Sci. Technol. 48, 1320 (2005). [22] S. Chiba et al., Phys. Rev. C 58, 2205 (1998). [23] T. Ye, Y. Watanabe, K. Ogata, and S. Chiba, Phys. Rev. C 78, 024611 (2008). [24] M. Yahiro, K. Ogata, and K. Minomo, in preparation.
JAEA-Conf 2011-002 17. Thermal / epi-thermal neutron spectrometer with a 3 He position sensitive proportional counter Masao ITO*, Isao MURATA Division of Electronic and Information Engineering, Osaka University Yamada-oka 2-1, Suita, Osaka, 565-0871 Japan *E-mail: ito@ef.eie.eng.osaka-u.ac.jp At present, measurement of energy spectrum for thermal and epi-thermal neutrons becomes crucial to apply to the medical, as well as physical applications. In the present paper, we described the preliminary result of ongoing development of a new thermal and epi-thermal neutron spectrometer using the detection depth information measured by a 3 He position sensitive proportional counter. 1. Introduction Spectrum measurement of thermal and epi-thermal neutrons is becoming crucial recently considering possible applications such as boron neutron capture therapy (BNCT). But there is no direct technique to measure the low-energy neutron spectrum. In the low-energy neutron measurement, there are some conventional ways. The most frequently used ways are a gas counter like BF3, 3 He and fission chamber. However, they have too large Q-values compared with the incident neutron energy to detect the energy correctly. Next is the foil activation method, which uses several types of foils and unfolding code to estimate the neutron spectrum. This method is available only by off-line analysis and the unfolding process is regarded more-or-less as an underdetermined problem. If the neutron source is pulsed, the time-of-flight method can be used. It needs a complicated technique in processing detector signals with electronic modules. However, the resulting accuracy is known to be commonly high. In BNCT facilities, the major problem in the neutron spectrum measurement is how precisely the energy could be determined. So in this study we have been developing a new spectrometer which aimed at realization of measurement of the low-energy neutrons from thermal to 10keV. We have developed a prototype detector of 3 He position sensitive proportional counter. The spectrometer acquires the information as to how deep an incident neutron has reached in the detector and where the nuclear reaction with the detection gas by the neutron has occurred. The multi-parameter MCA system was set-up for measuring signals from the detector in the two dimensional space. The response function of the detector, that is, the detection position distribution of each energetic neutron, is calculated from the neutron cross section data. The neutron spectrum can be derived by unfolding the measured detection position (depth) distribution with the response function of the detector. This time, we measured thermal neutrons which are produced by
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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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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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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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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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