ENTRY 41324 20120808 41584132400000001 SUBENT 41324001 20120808 41584132400100001 BIB 13 35 4132400100002 INSTITUTE (4RUSEPA) 4132400100003 REFERENCE (C,95OBNIN,,303,199510) Main reference, data are given4132400100004 In English. 4132400100005 TITLE Integral neutron fission cross-section measurement 4132400100006 for 238-Np near the thermal point 4132400100007 AUTHOR (S.Abramovich,M.Andreev,Yu.Bol'shakov,V.Gavrilov, 4132400100008 B.Guzhovskiy,N.Krylov,I.Kunitsina,G.Novoselov, 4132400100009 V.Serov,E.Fomushkin) 4132400100010 MONITOR (92-U-235(N,F),,SIG) 4132400100011 From book of V.M.Gobachev+,Vzaimodejstviemixluchenij 4132400100012 s yadrami tyazshelyh elemntov i delenie yader.Atomizdat4132400100013 1976. 4132400100014 For integral neutron flux and efficiency of FF 4132400100015 registration by track chamber. 4132400100016 FACILITY (VDGT) Tandem accelerator EGP-10. Deutron Beam 4132400100017 of 1. mu-A current and 11.5 MeV energy struck . 4132400100018 Berillium target 1 mm thickness 4132400100019 INC-SOURCE (THCOL) Fast neutron produced by Be-9(D,N) reaction 4132400100020 were moderated in polyethilene cylinder 32 cm diam 4132400100021 30 cm length . 4132400100022 INC-SPECT Thermal neutron flux is 4.0e+8 n/cm2/sec, cadmium 4132400100023 ratio for U-235 fission reaction is 41.9+-0.5 4132400100024 METHOD (FISCT) Irradiation with and without Cd filter of 4132400100025 0.45 mm thickness. 4132400100026 DETECTOR (TRD) Dielectric track detectors - for FF registration.4132400100027 Geometry efficiency of track chamber 0.565+-0.014 . 4132400100028 (FISCH) Ionization chamber with U-235 calibrated layer 4132400100029 was used to investigate thermal neutrons field in 4132400100030 polyethylene block. 4132400100031 ERR-ANALYS (DATA-ERR) Errors are not specified. 4132400100032 STATUS .Data are taken from the main reference 4132400100033 HISTORY (19990118C) + + Compiled at the centre - CJD + + 4132400100034 (20120808A) M.M. Upper -> lower case correction. 4132400100035 BIB information was updated. 4132400100036 Subents 002, 003 were superseded. 4132400100037 ENDBIB 35 0 4132400100038 COMMON 1 3 4132400100039 MONIT 4132400100040 B 4132400100041 582.25 4132400100042 ENDCOMMON 3 0 4132400100043 ENDSUBENT 42 0 4132400199999 SUBENT 41324002 20120808 41584132400200001 BIB 3 7 4132400200002 REACTION (93-NP-238(N,F),,SIG) 4132400200003 SAMPLE Np-238 sample was prepared at the expense of reaction 4132400200004 U-238(P,N)Np-238 and electrolytically deposited on 4132400200005 0.3 mm stainless-steel backing. Np-238 content is 4132400200006 6.64+-0.11)E+11, Np-239 content is (1.69+-0.06)E+10 4132400200007 STATUS (TABLE) Text, page 315 of C,95OBNIN,,303,1995. 4132400200008 (SPSDD,41341004) Superseded by newer publication. 4132400200009 ENDBIB 7 0 4132400200010 NOCOMMON 0 0 4132400200011 DATA 3 1 4132400200012 EN-DUMMY DATA DATA-ERR 4132400200013 EV B B 4132400200014 2.53E-02 2110. 74. 4132400200015 ENDDATA 3 0 4132400200016 ENDSUBENT 15 0 4132400299999 SUBENT 41324003 20120808 41584132400300001 BIB 3 7 4132400300002 REACTION (91-PA-232(N,F),,SIG) 4132400300003 SAMPLE Pa-232 sample was prepared at the expense of reaction 4132400300004 Th-232(P,N)Pa-232 and electrolytically deposited on 4132400300005 platinum backing. 4132400300006 STATUS (TABLE) Text, page 318 of C,95OBNIN,,303,1995. 4132400300007 (PRELM) Preliminary value. 4132400300008 (SPSDD,41341002) 4132400300009 ENDBIB 7 0 4132400300010 NOCOMMON 0 0 4132400300011 DATA 2 1 4132400300012 EN-DUMMY DATA-APRX 4132400300013 EV B 4132400300014 2.53E-02 2000. 4132400300015 ENDDATA 3 0 4132400300016 ENDSUBENT 15 0 4132400399999 SUBENT 41324004 20120808 41584132400400001 BIB 3 4 4132400400002 REACTION (93-NP-238(N,F),,RI) 4132400400003 ANALYSIS Average-weighted value was defined from 6 runs. 4132400400004 STATUS (TABLE) Text, page 318 of C,95OBNIN,,303,1995. 4132400400005 (DEP,41324005) See ANALYSIS. 4132400400006 ENDBIB 4 0 4132400400007 NOCOMMON 0 0 4132400400008 DATA 3 1 4132400400009 EN-MIN DATA DATA-ERR 4132400400010 EV B B 4132400400011 0.5 905. 48. 4132400400012 ENDDATA 3 0 4132400400013 ENDSUBENT 12 0 4132400499999 SUBENT 41324005 20120808 41584132400500001 BIB 6 40 4132400500002 REACTION (93-NP-238(N,F),,RI) 4132400500003 SAMPLE Number of nuclei of isotopes in layer by the moment of4132400500004 measurement: 4132400500005 Run Np-238 Pu-238 Pu-239 4132400500006 1 7.49E+11 1.23E+12 3.13E+10 4132400500007 2 6.49E+11 1.33E+12 3.41E+10 4132400500008 3 5.34E+11 1.44E+12 3.73E+10 4132400500009 4 4.62E+11 1.52E+12 3.93E+10 4132400500010 5 3.81E+11 1.60E+12 4.17E+10 4132400500011 6 3.51E+11 1.63E+12 4.26E+10 4132400500012 MISC-COL (MISC1) Run number, see sample. 4132400500013 (MISC2) Time passed after layer production. 4132400500014 (MISC3) Integral neutron flux on the layer, 10**-11. 4132400500015 (MISC4) Number of registered tracks. 4132400500016 CORRECTION For contribution of background from fission of Pu-238,4132400500017 Pu-239, U-235, U-238, Np-237, measurements were 4132400500018 performed in the same layers after 492.9 hr and 555.4 4132400500019 hr after layer production, when Np-238 and Np-239 4132400500020 isotopes had decayed and their contribution might be 4132400500021 neglected. 4132400500022 Isotope Number of nuclei Number of tracks 4132400500023 Run1 Run2 4132400500024 Pu-238 1.98E+12 37.6 35.1 4132400500025 Pu-239 5.40E+10 9.4 8.8 4132400500026 U-235 6.E+11 101.8 82.3 4132400500027 U-238 2.7E+14 339.6 274.6 4132400500028 Np-237 6.E+13 222.1 207.0 4132400500029 Np-238 1.06E+9 ~0.5 ~0.2 4132400500030 0.45E+9 4132400500031 Total number of tracks 711. 608. 4132400500032 Neutron integral flux 1.03E+12 0.96E+12 4132400500033 Pu-238,Pu-239 nuclei number - from analysis of gamma an4132400500034 alpha spectra. 4132400500035 ASSUMED (ASSUM1,94-PU-238(N,F),,RI) 4132400500036 (ASSUM2,94-PU-239(N,F),,RI) 4132400500037 (ASSUM3,92-U-235(N,F),,RI) 4132400500038 (ASSUM4,92-U-238(N,F),,RI) 4132400500039 (ASSUM5,93-NP-237(N,F),,RI) 4132400500040 ASSUMED data were used for background . 4132400500041 STATUS (TABLE) Table 7 of C,95OBNIN,,303,1995. 4132400500042 ENDBIB 40 0 4132400500043 COMMON 6 3 4132400500044 EN-MIN ASSUM1 ASSUM2 ASSUM3 ASSUM4 ASSUM5 4132400500045 EV B B B B B 4132400500046 0.5 32.7 299. 275. 2.02 6.36 4132400500047 ENDCOMMON 3 0 4132400500048 DATA 6 6 4132400500049 DATA DATA-ERR MISC1 MISC2 MISC3 MISC4 4132400500050 B B NO-DIM HR SEE TEXT NO-DIM 4132400500051 812. 54. 1. 12.08 2.28 225. 4132400500052 980. 66. 2. 22.57 2.19 220. 4132400500053 983. 61. 3. 36.87 2.71 256. 4132400500054 1024. 63. 4. 47.42 2.89 265. 4132400500055 784. 52. 5. 61.63 2.78 228. 4132400500056 1221. 136. 6. 67.62 0.436 39. 4132400500057 ENDDATA 8 0 4132400500058 ENDSUBENT 57 0 4132400599999 ENDENTRY 5 0 4132499999999