1 PROMPT FISSION NEUTRON SPECTRA and FISSION CROSS
![19 235 U(n, F) [PFNS En=7 Мe. V] 238 U(n, F) V. M. Maslov](https://slidetodoc.com/presentation_image_h/74b8e009b0a99e28c7be5f4e80b728e7/image-19.jpg "19 235 U(n, F) [PFNS En=7 Мe. V] 238 U(n, F) V. M. Maslov")
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![33 238 U(n, F) [PFNS En=7 Мe. V] 232 Th(n, F) V. M. Maslov](https://slidetodoc.com/presentation_image_h/74b8e009b0a99e28c7be5f4e80b728e7/image-33.jpg "33 238 U(n, F) [PFNS En=7 Мe. V] 232 Th(n, F) V. M. Maslov")
![34 238 U(n, F) [PFNS En=20 Мe. V] 232 Th(n, F) V. M. Maslov](https://slidetodoc.com/presentation_image_h/74b8e009b0a99e28c7be5f4e80b728e7/image-34.jpg "34 238 U(n, F) [PFNS En=20 Мe. V] 232 Th(n, F) V. M. Maslov")
- Slides: 72
1 PROMPT FISSION NEUTRON SPECTRA and FISSION CROSS SECTIONS of Th, U, Np, Pu V. M. Maslov Joint Institute for Nuclear and Energy Research, 220109, Minsk-Sosny, Belarus V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
2 SCOPE Prompt fission neutron spectra of 232 -Th(n, F), 235 -U(n, F), 238 -U (n, F), 239 -Pu (n, F), 237 -Np(n, F), 241 -Am(n, F) V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
3 AVERAGE ENERGY OF 239 Pu(n, f) PFNS V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
4 235 U(n, F) Average energies of PFNS for 0. 4< E n <200 Me. V by Ethvignot et al. , Phys. Rev. Let. Vol. 94, 052701, 2005 238 U(n, F) Average energies of PFNS for 1. 7 <E <200 Me. V n by Ethvignot et al. , Phys. Lett. B 575, 221, 2003 Prompt fission neutron spectra (PFNS) 238 U(n, F), 232 Th(n, F) at E < 20 Me. V, n Maslov et al. Phys. Rev. C 69, 034607, 2003 235 U(n, F), Maslov et al. , Nucl. Phys. , A 760, 274, 2005 239 Pu(n, F), Maslov, Atomic Energy, 103, 633, 2007 237 Np(n, F), Maslov, Atomic Energy, 104, 330, 2008 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
5 Multiple-chance fission – pre-saddle (pre-fission) plus post-scission (postfission) neutrons (pre-acceleration NE + NE from accelerated fragments) Consistent analysis of (n, f) and competing (n, xn) reactions Prompt fission neutron spectra (PFNS) of 235 U(n, f), 238 U(n, f), 232 Th(n, f) at En < 20 Me. V Exclusive pre-fission (pre-saddle) (n, xnf) reaction neutron spectra+ multiplechance fission cross section structure PFNS for actinides for En <20 Me. V V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
6 Prompt fission neutron spectra Model based on the energy balance in the domain of multiple-chance fission Spectra of neutrons, evaporated from fission fragments, were approximated as a sum of two Watt’ distributions. Calculated exclusive pre-fission (n, xnf) neutrons spectra energy dependence of PFNS of A+1 compound for prompt fission neutron energies Eth=En - Bf resembles the shape of fission probability Pf of A residual nuclide V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
7 Prompt-fission neutron spectra superposition of exclusive pre-fission (n, xnf) spectra and post-fission spectra SA+2 -x ( , En) V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
8 SA+2 -x ( , En) - sum of two Watt distributions: -temperature for light and heavy fragments, α =TKE/TKE In Watt' equation CMS energy per nucleon - V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
9 <E> PFNS 238 U(n, F) V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
10 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
11 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
12 235_U(nth, f), PFNS, ~50 ke. V shift in <E> V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
13 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
14 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
15 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
16 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
17 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
18 238_U(n, F) En=7 Me. V 235_U(n, F), V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
19 235 U(n, F) [PFNS En=7 Мe. V] 238 U(n, F) V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
20 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
21 237 U(n, F); 238 U(d, d’f)/236 U(d, d’f); 238 U(a, a’f)/236 U(a, V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008 a’f)
22 237 U(n, F); 238 U(d, d’f)/236 U(d, d’f); 238 U(a, a’f)/236 U(a, V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008 a’f)
23 235 U(n, F) n of PFN V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008 238 U(n, F)
24 238_U(n, f), En=14. 7 Me. V V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
25 PFNS 238 U(n, F) En=16 Мe. V En =17, 7 Мe. V V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
26 238 U(n, F) [PFNS En=14. 7 Мe. V] V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
235_U(n, f), En=14. 7 Me. V V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008 27
28 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
29 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
30 235 U(n, F) V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008 & 235 u(n, 2 n)
31 232 Th(n, F) V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008 231 Th(n, f)
32 Vp PFN 238 U(n, F) & 232 Th(n, F) V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
33 238 U(n, F) [PFNS En=7 Мe. V] 232 Th(n, F) V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
34 238 U(n, F) [PFNS En=20 Мe. V] 232 Th(n, F) V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
35 PFNS 232 Th(n, F) En=14, 7 Мe. V En =17, 7 Мe. V V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
36 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
37 238 U FISSION NEUTRON SPECTRUM, E 1. 6 0=16. 0 238 U FISSION NEUTRON SPECTRUM, E Me. V 2. 8 LOVCHIKOVA, 2000 JENDL-3. 2 Me. V JENDL- 3. 2 ENDF/B-VI 2. 4 a =1 1 1. 4 0=17. 7 LOVCHIKOVA, 2000 a =1 1 a =0. 8 1 2. 0 1. 2 o , E) 1. 6 R(E 1. 0 1. 2 0. 8 0. 6 0 2 4 6 8 NEUTRON ENERGY, Me. V 10 12 0 2 4 6 8 10 NEUTRON ENERGY, Me. V FIG. 19 Th FISSION NEUTRON SPECTRUM, E 0~14. 7 232 Th FISSION NEUTRON SPECTRUM, E Me. V 2. 8 BOIKOV, 1991 0=17. 7 Me. V LOVCHIKOVA, 2000 JENDL-3. 2 ENDF/B-VI 2. 4 14 FIG. 20 232 2. 8 12 a =1 1 a =0. 8 1 2. 0 o , E) 1. 6 R(E 1. 6 1. 2 0. 8 0 2 4 6 8 10 NEUTRON ENERGY, Me. V 12 14 0 2 4 6 8 10 NEUTRON ENERGY, Me. V FIG. 21 235 U FISSION NEUTRON SPECTRUM, E 12 14 FIG. 22 0=14. 7 Me. V 232, 238 U FISSION NEUTRON SPECTRUM, E 0=14. 7 Me. V 2. 0 BOIKOV, 1991 232 U ENDF/B-VI 1. 6 238 U 1. 6 a =1 1 a =0. 7 1 , E) 1. 2 o o , E) 1. 2 R(E 0. 8 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008 0 2 4 6 8 NEUTRON ENERGY, Me. V FIG. 23 10 12 0 2 4 6 8 10 12 14 16 NEUTRON ENERGY, Me. V FIG. 24 18 20
38 <E> PFNS 232 Th(n, F) V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
39 239 Pu(n, F) cross V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008 section
40 239 Pu(n, 2 n) cross V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008 section
41 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
42 237 Pu(n, f) V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
43 239 Pu(n, F) PFNS, V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008 En=7 Me. V
44 239 Pu(n, F) PFNS, V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008 En=7 Me. V
45 239 Pu(n, xnf)1 neutron V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008 spectrum En=14. 7 Me. V
46 235 U(n, F) PFNS, En=14. 7 Me. V 239 Pu(n, F) V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
47 239 Pu(n, F) PFNS, V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008 En=14. 7 Me. V
48 AVERAGE ENERGY OF 239 Pu(n, f) PFNS V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
49 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
50 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
51 AVERAGE ENERGY OF 239 Pu(n, f) PFNS V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
52 235 U(n, F) &238 U(n, F)AVERAGE ENERGY OF PFNS V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
53 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
54 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
55 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
56 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
57 237 Np(n, F), PFNS, En=0. 52 Me. V V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
58 En=7. 8 Me. V 237 Np, PFNS, En=14. 7 Me. V V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
59 237_Np(n, F) <E> OF PFNS V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
60 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
61 242 g. Am/242 m. Am 236 s. Np/236 l. Np 0. 35, 242 g. Am= 242 s. Am V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008 Gancartz -
62 241_Am(n, F), AVERAGE ENERGY OF PFNS V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
63 Conclusions 1. Pre-fission (n, xnf) spectra+ neutrons from the fission fragments - a number of peculiarities in 235 U(n, f) are interpreted as for 238 U(n, f) and 232 Th(n, f) PFNS for En <20 Me. V 2. Predicted multiple-chance fission contributions of 239 Pu(n, F) PFNS are correlated with the (n, f), (n, 2 n) and (n, 3 n) data description 3. The energy balance model for the multi-chance fission is validated for En<20 Me. V describing fission cross sections, PFNS, and neutron multiplicities. V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
64 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
65 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
66 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
67 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
68 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
69 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
70 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
71 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
72 V. M. Maslov , CM on PFNS, IAEA, 24 -27 Nov. , 2008
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