JAEA-Conf 2011-002 - 日本原子力研究開発機構

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JAEA-Conf 2011-002 events can be identified through the range-energy plot method [8]. The range can be determined using the signal from the cathode electrode. On the other hand, the events within the dotted circle (ii) have too high energy to be stopped in BCC and penetrate it. The missed energy can be compensated through off-line analysis [9]. By using these two new methods, the energy spectra can be obtained for each fragment over 0.5 MeV/nucleon to tens of MeV. Fig.3 Two dimensional plot of events at 30 from 80 MeV The measured data were analyzed to proton induced reaction on carbon obtain energy spectra for each fragment with Z, corrected for the effects of energy losses in sample and incident window, and normalized to solid angle, the number of target atoms and the number of incident protons. 3. Results and discussion From the measurements, we have obtained DDX data of fragments for proton-induced reactions on C, N, O, Al, Ti and Cu at several beam energies between 40 and 300 MeV, and several laboratory angles between 30 and 120. The spectra were obtained down to 0.5 MeV/u. Here, typical examples are shown as preliminary data. Final results will be reported later. Figure 4 shows the results of fragment DDX for the Al(p,X) reaction for Ep=200 MeV. The figure shows Li, Be, B and C spectra for 30, 60, 90, 120 emission angles. The experimental results taken by Machner et al. are also plotted for Li and Be emission. It should be noted that their data were obtained using counter telescopes with Si detectors and cover the energy region only above 20 MeV. The present data smoothly connect to their data. The figure clearly shows that two data are consistent with each other. The low cutoff energies of the present data, < 0.5 MeV/u permits to cover the energy region with highest yields. Therefore, the data provides not only spectrum information but also integral cross section, experimentally. In addition, the present result has relatively continuous distribution shows high energy tail that is observed in the other results for Li and Be emission [2-5]. Concerning B and C spectra, the peak yields are comparable to Li and Be. The fact indicates that emission process of B and C are similar to that of Li and Be. Figure 5 shows the results for the C(p,xLi) reaction at 30 for Ep=40, 50, 70, 80, 140, 200 MeV. A change of spectra shapes is observed with increasing incident proton energy. For relatively low incident energies, 40 and 50 MeV, peak structures are observed around the high energy end above continuum components. The energy differences between peak structures are close to the energy between the ground
DDX [mb/MeV/sr] 10 -9 10 -8 10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 10 0 10 1 10 2 Al(p,x) Ep=200MeV C x 1E-6 and excitation states of 7 Be. Thus, the peak will be attributed to the two-body reaction, 12 C (p, 6 Li) 7 Be. A similar peak structure is also observed for Be spectra for 40 and 50 MeV proton on carbon (not shown here). The peak structure disappears with increasing incident energy. Therefore, the contribution of the cluster structure of target nuclei should be considered to describe fragment emission from light targets in this energy range, as pointed out in former works [6,7]. The present data set covers fragment DDXs for light to medium target nuclei, incident energies from 40 to 300 MeV. With combining the former studies for medium to heavy target nuclei [2-5], systematic, self-consistent experimental data become available to evaluate and improve theoretical JAEA-Conf 2011-002 30deg. Present Machner (20deg.) B x1E-4 Li x1 Be x1E-2 DDX [mb/MeV/sr] 10 1 10 0 10 -1 10 -2 10 -3 10 -4 10 -5 10 -6 10 -7 10 -8 10 -9 10 -10 10 -11 10 -12 10 -13 C(p,xLi) at 30-deg. 60deg. Present Machner 10 0 40 80 Particle Energy [MeV] -10 10 -9 10 -8 10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 10 0 10 1 10 2 90deg. Present Machner 0 40 120deg. Present Machner (110deg.) 80 Fig.4 Fragment DDX for Al(p,X) reaction for Ep=200MeV (Preliminary) Present 200MeV x 1 140 MeV x 1E-2 80 MeV x1E-4 70 MeV x 1E-6 50 MeV x 1E-10 40 MeV x 1E-12 0 10 20 30 40 50 60 Particle Energy [MeV] Fig. 5 C(p,xLi) reaction at 30 degrees for Ep=40, 50, 70, 80, 140, 200 MeV (Preliminary)
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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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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 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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