ENTRY 20112 20170122 22572011200000001 SUBENT 20112001 20170122 22572011200100001 BIB 11 28 2011200100002 INSTITUTE (2SWDFOA) 2011200100003 REFERENCE (J,AF,29,(4),33,196504) Main ref. for the Th-232 data. 2011200100004 (C,65SALZBURG,2,57,196503) Preliminary report. 2011200100005 (R,FOA4-A-4397-411,196410) 2011200100006 AUTHOR (H.Conde,M.Holmberg) 2011200100007 TITLE Average number of prompt neutrons emitted in the 2011200100008 neutron induced fission of Th-232 2011200100009 FACILITY (VDG,2SWDFOA) Van de Graaff accelerator 2011200100010 METHOD .Detection of fission neutrons 2011200100011 DETECTOR (STANK) Large liquid scintillator 2011200100012 MONITOR (98-CF-252(0,F),PR,NU) 2011200100013 CORRECTION .The following corrections were applied to the relative2011200100014 values, 2011200100015 .overlap correction, 2011200100016 .false gates, 2011200100017 .differences in the fission neutron spectra, 2011200100018 .anisotropy of fission neutron emission, 2011200100019 .fission foil thickness, 2011200100020 .fission induced by background neutrons, 2011200100021 .impurities in the fissile deposit, 2011200100022 .uncertainty in the primary neutron energy. 2011200100023 ERR-ANALYS (DATA-ERR) Uncertainty in monitor reaction 2011200100024 HISTORY (19710513T) From NEUDADA file 2011200100025 (19800822A) Subent 003 deleted, duplicate with EXFOR 2011200100026 20025.003, and reference corrections. 2011200100027 (20170122A) SD:Major revisions in 002. Subent 003 2011200100028 moved to 20025 Entry (see Subent 20025.004). 2011200100029 NO-DIM -> PRT/FIS in COMMON section. 2011200100030 ENDBIB 28 0 2011200100031 COMMON 2 3 2011200100032 MONIT MONIT-ERR 2011200100033 PRT/FIS PRT/FIS 2011200100034 3.775 0.002 2011200100035 ENDCOMMON 3 0 2011200100036 ENDSUBENT 35 0 2011200199999 SUBENT 20112002 20170122 22572011200200001 BIB 9 35 2011200200002 REACTION (90-TH-232(N,F),PR,NU) 2011200200003 INC-SOURCE (D-T) The neutrons with energies from 1.4 to 2.6 MeV 2011200200004 were produced by the reaction T(p,n)He3 using thin 2011200200005 adsorbed tritium targets with gold backings. 2011200200006 (D-D) At 7.45 MeV a deuterium gas-target was used 2011200200007 SAMPLE * The chamber contained a total amount of 1.3 g of 2011200200008 Th-232 and was filled with a mixture of argon and 10% 2011200200009 of CO2 to a pressure of 1 atm. The fissile material 2011200200010 was painted on ten platinum plates, 4.4 cm in diameter,2011200200011 with a coating thickness of 4 mg/cm2. The plates were 2011200200012 mounted in parallel in the fission chamber with an 2011200200013 interspace of 5 mm. 2011200200014 * The measurement at 1.6 MeV was also made with 2011200200015 another type of fission chamber, which consisted of 2011200200016 three concentric platinum cylinders with a height of 2011200200017 5 cm and an interspace of 5 mm. The total deposited 2011200200018 area was about 350 cm2 and the thickness 2011200200019 of the coated Th232-layer was 2 mg/cm2. 2011200200020 REL-REF (R,20072002,H.Conde+,J,NSE,11,397,1961) 2011200200021 COMMENT .A least square fit to the data from 1.6 to 14.9 MeV 2011200200022 of incident neutron energy E(n) yields 2011200200023 nu-bar(E(n)) = 1.849+0.154*E(n) 2011200200024 .The measurements indicate that the energy dependence 2011200200025 in the energy region near the fission threshold may be2011200200026 non-linear 2011200200027 FLAG (1.) Corrected data from ref. (see REL-REF), assuming 2011200200028 the same corrections as in the present investigation. 2011200200029 ERR-ANALYS (ERR-S) The error given is statistical only. 2011200200030 (ERR-1,,0.5) The error in the nu-bar value due to 2011200200031 uncertainties in the correction is estimated to be 2011200200032 less than 0.5% 2011200200033 STATUS (TABLE) Table 1 in AF,29,4,33,1965 2011200200034 HISTORY (20170122A) SD: BIB update. Part of information from 2011200200035 COMMENT moved to REL-REF and FLAG. NO-DIM -> PRT/FIS 2011200200036 in DATA section at columns DATA and ERR-S. 2011200200037 ENDBIB 35 0 2011200200038 NOCOMMON 0 0 2011200200039 DATA 5 9 2011200200040 EN EN-RSL DATA ERR-S FLAG 2011200200041 MEV MEV PRT/FIS PRT/FIS NO-DIM 2011200200042 1.42 0.02 2.205 0.060 2011200200043 1.61 0.01 2.084 0.037 2011200200044 1.80 0.01 2.119 0.055 2011200200045 2.23 0.01 2.180 0.049 2011200200046 2.64 0.01 2.273 0.052 2011200200047 3.6 0.3 2.41 0.10 1. 2011200200048 7.45 0.05 3.028 0.060 2011200200049 14.8 0.2 4.065 0.060 2011200200050 14.9 0.3 4.32 0.13 1. 2011200200051 ENDDATA 11 0 2011200200052 ENDSUBENT 51 0 2011200299999 NOSUBENT 20112003 20170122 22572011200300001 ENDENTRY 3 0 2011299999999