JAEA-Conf 2011-002 - 日本原子力研究開発機構

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Beam Line BM1 Copper Target BM2 5×5×60 cm 3 BM3 30 degree 5.5 m Veto 3.6 m Beam dump NE213 (5×5 inch) Fig. 1 Schematic view of experimental setup. 120 GeV proton beam comes from left side. Number of protons were counted by three plastic scintillator (BM1,2,3). Copper target, the dimension of which is 5 x 5 x 60 cm, was placed on the beam path. NE213 scintillator with Veto plastic scintillator was placed at 5.5 m from the target, 30◦ with respect to beam axis. NE213 Veto BM 3 BM 2 BM 1 CFD ADC Slow ADC Total CFD CFD CFD ADC Total COIN. 1 ADC BM1 JAEA-Conf 2011-002 20 nsec 200 nsec COIN. 2 INHIBIT 200 nsec 10 nsec LATCH STOP G.G. 1 START G.G. 2 G.G. 3 G.G. 4 COIN. 3 Output Register Triger in ADC Slow Gate ADC Total Gate TDC Start TDC Stop ADC BM1 Gate Scaler in flight CFD : Constant Fraction Discriminator COIN. : Coincidence G.G. : Gate Generator Fig. 2 Block diagram of data acquisition electronics. The electronics consisted of standard NIM and CAMAC modules. Trigger signal for data accumulation was generated from coincidence of the NE213 scintillator and the BMs. the time difference between coincidence of the BMs and the NE213 scintillator were stored as neutron flight time. Integrals of signals from the NE213 scintillator, the BM1, and veto detector were digitized using ADCs. Counts of the scaler in flight were recorded for correction of multi proton event during neutron time-of-flight.
2 Experiment Figure 1 shows schematic view of experimental arrangement. The 120 GeV proton from the main injector are delivered to an area of 8×20 m2 . The number of incident protons were counted by three thin NE102A plastic scintillators (Beam monitors - BM 1, 2 and 3) which were located at upstream the target. The beam profile and position were monitored by a multi-wire proportional chamber. The sigma of beam radius was about φ 5 mm at the target position. The copper block, the dimension of which was 60 cm long and 5×5 cm2cross section, was employed as the neutron production target. The neutron detector was located at 5.5 m from the target and 30◦ with respect to the beam axis. An NE213 liquid scintillator with 12.7 cm diameter, 12.7 cm long was employed as the neutron detector. The scintillator is suitable for neutron time-of-flight measurement due to pulse shape discrimination capability and fast decay time of its scintillation. To eliminate charged particles, a 2 mm thick NE102A plastic scintillator as the veto detector was placed in front of the NE213 scintillator. Figure 2 shows a block diagram of data acquisition electronics. The electronics consisted of standard NIM and CAMAC modules. Trigger signal for data accumulation was generated from coincidence among the NE213 scintillator and the BMs. The data were recorded event by event. The time difference between the BMs and the NE213 scintillator was recorded with a TDC for determination of neutron time-of-flight. Charge-sensitive ADCs were employed in order to record total component charge of pulses from the NE213 scintillator, the BM1, and the veto detector. Slow component charge of pulse from the NE213 scintillator was also recorded for pulse shape discrimination. In addition, the number of protons during 200 ns before neutron signal was recorded (scaler in flight in Fig. 2) to ensure that time-of-flight was determined properly, as described in the next section. Target-in measurement was carried out with beam intensity of 2×105 protons /min, during 3.5 hours. The counts of the BMs and the NE213 scintillator were 5×107 and 8×106 , respectively. The dead time of data acquisition was about 62 %. Target-out measurement was also performed to check contribution of background neutron from the dump since the dump was closer than one from the target, as shown in Fig. 1. 3 Analysis JAEA-Conf 2011-002 The energy spectra of neutrons, i.e. double differential thick target neutron yield (TTNY), d2Y (E)/dEdΩ, was deduced by the following equation, d2Y (E) dEdΩ = C(E) φ · ε(E) · Ω · ΔE where E is the neutron energy, C(E) the neutron counts in an energy bin, φ the number of protons, ε(E) the neutron detection efficiency, Ω the solid angle subtended by neutron detector, and ΔE the width of energy bin. Neutron events were identified by charged particle discrimination based on the veto detector signal, and gamma-ray discrimination based on the pulse shape of the NE213 scintillator. Neutron energy was determined by time-of-flight technique. We eliminated neutron event which could not uniquely determine its time-of-flight since two or more protons were counted by BM1 during neutron flight. The elimination was performed using data of ”scalar in flight” and ADC BM1 shown in Fig.2. The ”scalar in flight” was effective when the counts belong in different beam bunch. The ADC BM1 was effective when the counts belong in a same bunch. The count loss from the eliminations was corrected through the correction factor for the number of protons, as described in the next paragraph. The number of protons was determined using the following equation, (1)
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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 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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