Fission Product Yield Data for the Transmutation of Minor Actinide ...

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FIG. 4.3.7. Mass distribution of 239 Pu fission by 7.9 MeV neutrons. FIG. 4.3.8. Mass distribution of 239 Pu fission by 15.1 MeV neutrons. FIG. 4.3.9. Mass distribution of 238 U fission by 100 MeV neutrons. 153
Comparisons were also performed for proton induced fission. Examples are shown in Figs 4.3.11– 4.3.13. As seen in these figures, the present systematics is able to reproduce the measured mass distribution of proton induced fission [4.3.11– 4.3.13]. The average deviations are 0.192 for 243 Am, 0.836 for 248 Cm and 0.338 for 238 U. Although the deviation in the case of 248 Cm seems to be large, the experimental uncertainties shown in Fig. 4.3.12 are also rather large. As seen in Fig. 4.3.13, the present systematics can also be applied to fission by high energy protons (340 MeV). The present systematics is even applicable to spontaneous fission. Examples of the comparisons are shown in Figs 4.3.14 and 4.3.15, in which the evaluated data from the ENDF/B-VI file are used [4.3.14]. The present systematics agrees rather well with the evaluated mass yields from the 154 FIG. 4.3.10. Mass distribution of 238 U fission by 160 MeV neutrons. FIG. 4.3.11. Mass distribution of 243 Am fission by 15.6 MeV protons. spontaneous fission of minor actinides, even though a slight discrepancy is detectable at the peaks and in the valley region. The comparisons show that the present systematics can predict the gross behaviour of mass distributions from various kinds of fission, from spontaneous fission up to neutron and proton induced fission at energies above 100 MeV. 4.3.6. Summary As part of the IAEA Coordinated Research Project on Fission Product Yield Data for the Transmutation of Minor Actinide Nuclear Waste, we have developed a systematics for the calculation of fission product mass yields. This systematics uses five Gaussian functions for the description of mass distributions, the parameters of which have a rather simple functional form. We calculated the mass
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Fission Product Yield Data for the
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AFGHANISTAN ALBANIA ALGERIA ANGOLA
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COPYRIGHT NOTICE All IAEA scientifi
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CONTRIBUTING AUTHORS Denschlag, J.-
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3.2.1. Introduction . . . . . . . .
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6. BENCHMARK EXERCISE . . . . . . .
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However, this CRP entered an entire
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‘Provisional masses’ are determ
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Three scientists were invited to pa
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8 (d) Prompt or delayed neutron emi
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[2.1.40] ITKIS, M.G., OGANESSIAN, Y
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[2.1.96] PATE, B.D., et al., Distri
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[2.1.152] JACOBS, E., et al., Produ
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16 2.2. MEASUREMENTS OF THE ENERGY
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FIG. 2.2.3. 94 Sr: best experimenta
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FIG. 2.2.15. 132 Te: best experimen
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FIG. 2.2.27. 146 Ba: best experimen
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3. EVALUATIONS 3.1. ACTINIDE NUCLEO
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3.1.2. Statistical model At least t
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J Â K=-J 2 2 2 ^ sym Krot ( U, J)
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nuclei with N > 144. However, for h
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neutron number. The observed fissio
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FIG. 3.1.6. 235 U(n,f) fission cros
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FIG. 3.1.10. 237 Np(n,f) fission cr
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from higher fission chances [3.1.43
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[3.1.48] DUSHIN, V.N., et al., Stat
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where Y S is our new standard, and
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TABLE 3.2.2. EVALUATED REFERENCE FI
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TABLE 3.2.2. EVALUATED REFERENCE FI
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TABLE 3.2.3. EVALUATED REFERENCE YI
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TABLE 3.2.3. EVALUATED REFERENCE YI
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The comparisons of our evaluated da
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TABLE 3.2.4. COMPARISON OF RECOMMEN
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TABLE 3.2.8. COMPARISON OF THE UNCE
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REFERENCES TO SECTION 3.2 [3.2.1] I
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where N C , N U are the modified an
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activities were recorded with a pro
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3.3.4. Results and discussion The r
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FIG. 3.3.10. Li Ze et al. data: com
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96 Annex 3.3.1 EVALUATED EXPERIMENT
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Li Ze et al. [3.3.8] Thierens et al
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100 Annex 3.3.3 EVALUATED DATA SET
Page 113 and 114: The range of target nuclides availa
Page 115 and 116: condensation of cross-sections by t
Page 117 and 118: (h) REFERENCE (C,80KIEV,171,1980) i
Page 119 and 120: uncertainties of the calculation. T
Page 122 and 123: 4. SYSTEMATICS AND MODELS FOR THE P
Page 124 and 125: FIG. 4.1.2. 235 U total cross-secti
Page 126 and 127: FIG. 4.1.9. Total and mode separate
Page 128 and 129: 4.2. SYSTEMATICS OF FISSION PRODUCT
Page 130 and 131: A - = (PA - NT)/2 (4.2.1b) 4.2.2.3.
Page 132 and 133: FIG. 4.2.4(a). 238 U + 5.5 MeV n, L
Page 134 and 135: FIG. 4.2.8(a). U238 + 300 MeV p, LS
Page 136 and 137: TABLE 4.2.1. EQUATIONS FOR SYSTEMAT
Page 138 and 139: values (points) and the derived fun
Page 140 and 141: distributions. Values of N(A) seldo
Page 142 and 143: FIG. 4.2.19. Systematic Z P paramet
Page 144 and 145: FIG. 4.2.21. Systematic Z P paramet
Page 146 and 147: FIG. 4.2.23. Nuclear charge displac
Page 148 and 149: FIG. 4.2.24. Number of protons emit
Page 150 and 151: epresenting model values and thus s
Page 152 and 153: FIG. 4.2.36. n T(A) for CF249T. FIG
Page 154 and 155: FIG. 4.2.41. U235T, line: model; po
Page 156 and 157: The FAST subroutine in the CYFP pro
Page 158 and 159: [4.2.28] BELHAFAF, D., et al., Kine
Page 160 and 161: 4.3. FIVE GAUSSIAN SYSTEMATICS FOR
Page 162 and 163: Derived from measured data Fitted r
Page 166 and 167: FFIG. 4.3.12. Mass distribution of
Page 168 and 169: 4.4. PHENOMENOLOGICAL MODEL FOR FRA
Page 170 and 171: where = 2mE is the wavelength, E
Page 172 and 173: FIG. 4.4.4. Fragment mass distribut
Page 176 and 177: fragment mass distributions are des
Page 180 and 181: FIG. 4.4.10. Fragment mass distribu
Page 182 and 183: P LD È Ê * E - 44. 7ˆ ˘ = Í1 +
Page 184 and 185: FIG. 4.4.13. Pre-neutron emission m
Page 186 and 187: FIG. 4.4.15. Post-neutron emission
Page 188 and 189: FIG. 4.4.17. Post-neutron emission
Page 190 and 191: fragment mass and charge distributi
Page 192 and 193: of the energy dependence of the fus
Page 194 and 195: 4.5. MODAL APPROACH TO THE DESCRIPT
Page 196 and 197: This information was used for the p
Page 198 and 199: two neighbouring isotopes at differ
Page 200 and 201: FIG.4.5.2. Experimental relative ma
Page 202 and 203: Frequently, the yields Y i (M) are
Page 204 and 205: the nine optimum description parame
Page 206 and 207: TABLE 4.5.6. RELATIVE CONTRIBUTIONS
Page 208 and 209: TABLE 4.5.8. RELATIVE CONTRIBUTIONS
Page 210 and 211: Extracted values of s 2 M,S demonst
Page 212 and 213: FIG. 4.5.10. Fission fragment charg
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FIG. 4.5.12. Unchanged charge densi
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FIG. 4.5.16. Mass yield variance fo
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FIG. 4.5.20. Experimental mass yiel
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[4.5.24] GOVERDOVSKII, A.A., MITROF
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TABLE 4.6.1. FISSION PRODUCT YIELD
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TABLE 4.6.2. FIT PARAMETER VALUES O
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FIG. 4.6.2. Charge distributions fo
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model which is elucidated elsewhere
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the agreement is better. The observ
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inner barrier is much lower than th
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e determined in a self-consistent m
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FIG. 4.6.11. Overview of the coupli
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cross-section also has to be incorp
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FIG. 4.6.16. Same as Fig. 4.6.15, b
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FIG. 4.6.20. Pre-neutron emission m
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present have a reasonable contribut
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TABLE 4.6.5. ACCURACIES OBTAINED FR
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[4.6.7] BEIJERS, J.P.M., et al., Se
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5. NEW MODELS AND SYSTEMATICS: DEFI
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therefore his benchmark calculation
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mass distributions and practically
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5.2. BENCHMARK EXERCISE 5.2.1. Benc
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thorough and detailed analysis of t
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the fissioning nucleus and the numb
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should be undertaken — such a stu
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experimental method in order to der
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256 Valley heights and peak-to-vall
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FIG. 6.2.3. Benchmark exercise, par
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260 Wahl uncert. margins Wahl uncer
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264 Wahl uncert. margins (adj. Wahl
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Wahl (1.6-160 MeV): Distributions a
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TABLE 6.2.2. 238 U PRE-NEUTRON EMIS
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as most features are very similar t
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FIG. 6.2.14. Benchmark exercise, pa
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278 REFERENCES TO SECTION 6 [6.1] B
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As mentioned above, the mass distri
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I.3.2.6. Liu Conggui et al. [I.8] M
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after prompt-neutron emission, and
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286 Zöller (1995) 89-110 MeV, post
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(1) Data were linearly interpolated
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1. 290 Annex to Appendix I RECOMMEN
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1.2. E n = 5.5 MeV 292 Nagy et al.
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1.3. E n ª 8 MeV 294 Chapman (1978
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1.5. E n = 14-15 MeV 296 Daroczy et
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1.7. E n = 27.5 (22-33) MeV, Zölle
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1.9. E n = 99.5 (89-110) MeV, Zöll
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3. 302 239 Pu NEUTRON INDUCED FISSI
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Appendix II DATA ADJUSTMENT FOR MAS
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Vivès [II.8], Zöller [II.7] and
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Annex 1 to Appendix II ADJUSTED DAT
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Zöller (1995) [II.7] E n = 13 (11.
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E n = 50 (45-55) MeV Post-neutron e
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Äystö et al. (1998) [II.9] E p =
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E n = 1.60 MeV Pre-neutron emission
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E n = 27.5 (22-33) MeV Post-neutron
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E n = 99.5 (89-110) MeV Post-neutro
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Appendix III FISSION YIELD SYSTEMAT
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FIG. III.6. Dependence of chain yie
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TABLE III.2. Ln(y)-LINEAR(E) FIT CO
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FIG. III.14. Dependence of paramete
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FIG. III.26. Comparison of the mass
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FIG. III.38. Comparison of the mass
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TABLE III.3. QUADRATIC FUNCTION FIT
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Uncertainty ratio or uncertainty Ad
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CONTENTS OF THE CD-ROM The attached
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This publication reports on a coord
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