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

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FIG. 4.5.16. Mass yield variance for asymmetric fission, s a versus A and Z CN at E p = 10.3 and 22.0 MeV. FIG. 4.5.17. Experimental values CA 2 /8 and their linear parameterization from Th to Bk; closed circles: Ref. [4.5.34], open circles: Ref. [4.5.35]. TABLE 4.5.9. VALUES OF g 1 AND g 2 FOR DIFFERENT Z CN Z CN 90 91 92 93 94 95 96 97 98 g 1 0 –0.08 0.36 0.23 0.3 0.38 0.34 0.29 0.0 g 2 –0.36 –0.07 –0.34 –0.27 –0.3 –0.34 –0.25 –0.15 0.0 205
s S = A f(E*)/(a a – b a Z CN 2 /A) + ca (4.5.14) where a a , b a and c a are parameters of the systematics. The systematics parameters from Eqs (4.5.12)– (4.5.14) and dependences of Y S/Y a on Z CN, A and E* for proton and neutron induced fission have been determined by systematically fitting experimental data from the present work and from Refs [4.5.37–4.5.44]. One conclusion of this procedure is that the functions Y S /Y a for protons and neutrons differ, and the final equations are as follows: M H,a = 28.6(A/Z CN ) + 0.708 Z CN for Z CN ≥ 92; M H,a = 54A/Z CN for Z CN = 90, 91; s a = (A/Z CN )(Z CN – 73)(0.074 + 0.0296(E*) 0.25 ); s S = 0.031A(E*) 0.25 /(90.54 – 1.9(Z CN 2 /A)) 0.5 + 9.64; g 1 and g 2 from Table 4.5.9; Y S /Y a = 1.244(E*) 0.25 (1 – exp(–0.0027(E* – 5.7) 1.5 )) × (1 + 100/(E*) 0.5 (Z CN/A – 0.4)) for neutrons with E n = 5–200 MeV; Y S /Y a = 1.18((E*–5.7) 0.25 (1 – exp(–0.011(E* – 5.7) 1.5 )) – 0.101)(1 + 2500/E*(Z CN /A – 0.393)) for protons with E p = 5–200 MeV; Y a = 200/(Y S/Y a + 2); Y S = 200 – 2Y a Mass distributions Y(M) calculated from the systematics are compared to the experimental data in Figs 4.5.18–4.5.20. These figures show that this systematics reproduces the main features of the experimental data and could be used as the basis for predicting fission product yields from 5 to 200 MeV neutron reactions of interest for the transmutation of minor actinides. 4.5.6. PYF code The systematics has been encompassed within the PYF computer code [4.5.45] in order to calculate the pre- and post-neutron emission fragment mass yields for the fission of target nuclei from Th to Bk in reactions with protons and neutrons at incident energies from 5 to 200 MeV. The numbers of emitted prompt neutrons are 206 FIG. 4.5.18. Experimental mass yields (circles) from neutron induced fission at E n ª 5 MeV [4.5.36, 4.5.38– 4.5.41]; their systematic descriptions are also shown in linear and logarithmic scales (lines). FIG. 4.5.19. Experimental mass yields from neutron induced fission at E n = 16.5 MeV [4.5.43] (circles) and their systematic descriptions (lines) are shown in linear and logarithmic scales. calculated with the post-fission neutron number systematics from Ref. [4.5.46]. Figure 4.5.21 depicts the user’s window to the code, in which the initial input data for the desired reaction, the calculated results and the name of the
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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
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The range of target nuclides availa
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condensation of cross-sections by t
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(h) REFERENCE (C,80KIEV,171,1980) i
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uncertainties of the calculation. T
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4. SYSTEMATICS AND MODELS FOR THE P
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FIG. 4.1.2. 235 U total cross-secti
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FIG. 4.1.9. Total and mode separate
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4.2. SYSTEMATICS OF FISSION PRODUCT
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A - = (PA - NT)/2 (4.2.1b) 4.2.2.3.
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FIG. 4.2.4(a). 238 U + 5.5 MeV n, L
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FIG. 4.2.8(a). U238 + 300 MeV p, LS
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TABLE 4.2.1. EQUATIONS FOR SYSTEMAT
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values (points) and the derived fun
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distributions. Values of N(A) seldo
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FIG. 4.2.19. Systematic Z P paramet
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FIG. 4.2.21. Systematic Z P paramet
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FIG. 4.2.23. Nuclear charge displac
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FIG. 4.2.24. Number of protons emit
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epresenting model values and thus s
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FIG. 4.2.36. n T(A) for CF249T. FIG
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FIG. 4.2.41. U235T, line: model; po
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The FAST subroutine in the CYFP pro
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[4.2.28] BELHAFAF, D., et al., Kine
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4.3. FIVE GAUSSIAN SYSTEMATICS FOR
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Derived from measured data Fitted r
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FIG. 4.3.7. Mass distribution of 23
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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
Page 214 and 215: FIG. 4.5.12. Unchanged charge densi
Page 218 and 219: FIG. 4.5.20. Experimental mass yiel
Page 220 and 221: [4.5.24] GOVERDOVSKII, A.A., MITROF
Page 222 and 223: TABLE 4.6.1. FISSION PRODUCT YIELD
Page 224 and 225: TABLE 4.6.2. FIT PARAMETER VALUES O
Page 226 and 227: FIG. 4.6.2. Charge distributions fo
Page 228 and 229: model which is elucidated elsewhere
Page 230 and 231: the agreement is better. The observ
Page 232 and 233: inner barrier is much lower than th
Page 234 and 235: e determined in a self-consistent m
Page 236 and 237: FIG. 4.6.11. Overview of the coupli
Page 238 and 239: cross-section also has to be incorp
Page 240 and 241: FIG. 4.6.16. Same as Fig. 4.6.15, b
Page 242 and 243: FIG. 4.6.20. Pre-neutron emission m
Page 244 and 245: present have a reasonable contribut
Page 246 and 247: TABLE 4.6.5. ACCURACIES OBTAINED FR
Page 248 and 249: [4.6.7] BEIJERS, J.P.M., et al., Se
Page 250 and 251: 5. NEW MODELS AND SYSTEMATICS: DEFI
Page 252 and 253: therefore his benchmark calculation
Page 254 and 255: mass distributions and practically
Page 256 and 257: 5.2. BENCHMARK EXERCISE 5.2.1. Benc
Page 258 and 259: thorough and detailed analysis of t
Page 260 and 261: the fissioning nucleus and the numb
Page 262: should be undertaken — such a stu
Page 265 and 266: 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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