Druck-Materie 20b.qxd - JUWEL - Forschungszentrum Jülich

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ho(omega) normalised 40 35 30 25 20 15 10 5 0 0.000 0.005 0.010 0.015 0.020 0.025 omega in eV 32 Mac Farlane 1994 from Morishima 2001 Figure 24. Continuous part of the frequency distribution of H bound in solid methane around T=22K Total Cross Section (barn/molecule) 500 450 400 350 300 250 200 150 100 50 0 1.E-05 1.E-04 1.E-03 1.E-02 1.E-01 1.E+00 1.E+01 Energy (eV) Figure 25. Total neutron cross section for solid methane around T=20K GA-2503 T=20K McFarlane LEAPR (1994) IKE Morishima (2001) Grieger et. al (1998) T=19.5K
Neutron Flux Spectrum (arbitrary unit) 1.E+05 1.E+04 1.E+03 1.E+02 1.E+01 1.E-04 1.E-03 1.E-02 1.E-01 1.E+00 Energy (eV) Figure 26. Neutron flux density spectrum in solid methane around T=20K Spectrum phi(E) 1,00E+03 1,00E+02 1,00E+01 1,00E+00 1,00E-01 33 Exp. Inoue et al. MCNP-4C3 T=22K 1,0E-10 1,0E-09 1,0E-08 1,0E-07 1,0E-06 Energy, MeV MCNP: re-entrance hole MCNP: surface GA-2503: re-entrance hole GA-2503: surface Figure 27. Neutron flux density spectrum in solid methane at T=20K 5. CROSS SECTIONS DATA SETS FOR POLYCRYSTALLINE ALUMINIUM Aluminium metal crystallises at normal conditions in a face centered cubic (fcc) lattice structure. For cold moderators often it is used as a container material at low temperatures around 20K. To get optimally thermalised cold neutron flux spectra re-entrant holes often are implemented for these cold neutron sources with a wall thickness of 1-3 mm. The neutron-scattering nucleus interaction in fcc Al is pronounced essentially by the dynamical modes excitation of the Al lattice describing neutron downscattering or upscattering. Käfer [50] examined these correlations evaluating a generalised frequency distribution CH4
Page 1 and 2: ACoM - 6 6th 6 International Worksh
Page 3 and 4: Forschungszentrum Jülich GmbH Inst
Page 5: Preface These are the Proceedings o
Page 8 and 9: List of participants, cont’d. Kü
Page 10 and 11: Pepe M. 43 Petriw S. 43 Picton D.J.
Page 12 and 13: Experimental background, results an
Page 14 and 15: • Light water ice as H(H2O) at T
Page 16 and 17: In Table 2 a survey is given about
Page 18 and 19: sigma-T in barns/molecule Figure 4.
Page 20 and 21: 2.3 Liquid water Compared to the so
Page 22 and 23: presented. The corresponding experi
Page 24 and 25: 3.2 Gaseous hydrogen and deuterium
Page 26 and 27: Rho(Omega) normalised 160 140 120 1
Page 28 and 29: elatively free and can also suffer
Page 30 and 31: Figure 16. Heat Capacity for Solid
Page 32 and 33: o-D2 and p-H2 at 5K for an ucn ener
Page 34 and 35: Figure 22. UCN Upscattering Rates i
Page 38 and 39: derived from Walker [52]. The neutr
Page 40 and 41: Since there is only a small gain of
Page 42 and 43: 7. CALCULATION OF SCATTERING LAW DA
Page 44 and 45: For the validation of these data se
Page 46 and 47: [36] Nielsen, M.: Phonons in Solid
Page 48 and 49: 2. THE CASE OF MOLECULAR SOLIDS An
Page 50 and 51: γ r ( 0) ≅ 2 2 2 T erf e ( ) / 2
Page 52 and 53: 4. PRELIMINARY APPLICATION Solid Me
Page 54 and 55: [5] Meeting on Moderator Concepts a
Page 56 and 57: state. Conversely, the monatomic hy
Page 58 and 59: Note that the equilibrium trihydrog
Page 60 and 61: para hydrogen system under irradiat
Page 62 and 63: [12] T. E. Fessler and J. W. Blue,
Page 64 and 65: tion of neutron intensities, partic
Page 66 and 67: varied between calculations but the
Page 68 and 69: 5. THE OPTIMISATION OF MULTIPLY GRO
Page 70 and 71: Figure 7. A comparison of time dist
Page 72 and 73: 4.8 cm hydrogen slab in front of a
Page 75 and 76: ACoM - 6 6 th Meeting of the Collab
Page 77 and 78: the moderator is annealed every 12
Page 79 and 80: The method requires two additional
Page 81 and 82: ABSTRACT ACoM - 6 6 th Meeting of t
Page 83 and 84: Heat transfer processes across phas
Page 85 and 86: 3. TWO-PHASE FLOW PATTERN IN THE MO
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continuous phase dominating, and a
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Also the velocity pattern has chang
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Figure 8. Methane pellets concentra
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ACoM - 6 6 th Meeting of the Collab
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sample volume and the nominal densi
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The results presented in this paper
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Table 10. Summary of energy transfe
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2. EXPERIMENTAL Methane hydrate was
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Figure 4. Energy levels of methane
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102
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phase transitions from phase II to
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After melting phase I in the cryost
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4. SOLID PHASES OF MESITYLENE-D0 AN
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G(ν) [a.u.] 8 6 4 2 Phase II Phase
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112
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A not quite as perfect cold spectru
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2.2 Inelastic neutron scattering Th
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Figure 4. Inelastic spectra at the
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3.2 Moderator performance The resul
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122
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Figure 2. The methane pelletizer, m
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Figure 5. The cryogenic hopper fill
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128
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ture
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The charging device scheme could be
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Table 1. Data of irradiation of met
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5. METHODS OF PROCESSING OF RAW EXP
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of radicals, that is, before a burp
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6.2 Condition for thermally stimula
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Table 4. Estimated values of an ene
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• Nine spontaneous burps were obs
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APPENDIX Some useful relations and
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APPENDIX. Graphs of burps. 148
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150
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152
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154
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2. EXPERIMENTAL SETUP Fig. 1 will g
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All these parameters are kept const
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4. CONCLUSIONS We demonstrated that
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JESSICA (Juelich Experimental Spall
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The moderator system consists of th
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to change the temperatures and to p
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168
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supplied from the high pressure bom
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10 9 10 8 10 7 10 6 Para35%[Experim
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174
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2. TIME OF FLIGHT SPECTRA AND ENERG
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When applying this transformation t
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data were analyzed in more detail.
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182
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First of all, we should conclude th
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The equation (a) may also describe
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Even at h=0.01 mm which is too smal
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model and some consequences of its
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methane and 0.7-1.5% for water ice
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case: the sample of infinite size.
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196
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200
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Phase Diagram of the CH4-H20 system
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Reaction Chamber for Hydrate Produc
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Analysis: X-ray diffraction pattern
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Comparison with non-hydrate forming
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Mechanical Tests: Apparatus 220
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Morphology of Indium Jacket 222
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Schriften des Forschungszentrums J
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Schriften des Forschungszentrums J
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Druck-Materie 20b.qxd - JUWEL - Forschungszentrum Jülich

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