ENTRY 20072 20170127 22572007200000001 SUBENT 20072001 20170127 22572007200100001 BIB 13 33 2007200100002 INSTITUTE (2SWDFOA) 2007200100003 REFERENCE (J,NSE,11,397,196106) This measurement. 2007200100004 (C,65SALZBURG,2,57,196503) With different corrections2007200100005 (R,FOA4-A-4190-411,196103) 2007200100006 (R,EANDC(OR)-12U,196103) 2007200100007 AUTHOR (H.Conde,N.Starfelt) 2007200100008 TITLE Measurement of nu in fast neutron fission of Th-232 2007200100009 and U-238 2007200100010 FACILITY (CCW,2SWDFOA) Cockcroft-Walton accelerator 2007200100011 INC-SOURCE (D-D) D(d,n)He-3 for 3.6 MeV neutrons 2007200100012 (D-T) T(d,n)He-4 for 14.9 MeV neutrons 2007200100013 METHOD (COINC) Coincidences between fission fragments and 2007200100014 prompt neutrons. 2007200100015 DETECTOR (SCIN) Liquid scintillation detector 2007200100016 50 x 50 cm, 6 photomultipliers 2007200100017 (FISCH) Fission chamber in the center of the 2007200100018 cylindrical scintillator tank. 2007200100019 MONITOR (98-CF-252(0,F),PR,NU) 2007200100020 CORRECTION .For pile up (3%.), subtraction of background, 2007200100021 .Spontaneous fission of U-238 (1%), 2007200100022 .Random coincidences (less then 0.5%) 2007200100023 .Variation of the detection efficiency (0.5%) 2007200100024 .Escape of neutrons to the axial tube of the tank(0.5%)2007200100025 .Fission caused by neutrons which had lost energy in 2007200100026 the collimator (1 to 2.5%) 2007200100027 ERR-ANALYS (ERR-S) 5 - 10 separate runs per energy and element 2007200100028 were performed to give a statistical accuracy 2007200100029 STATUS (TABLE) Tbl. I from NSE,11,397,1961 2007200100030 HISTORY (19710512T) From NEUDADA file 2007200100031 (19800822A) Thorium data superseded by EXFOR 20112.002 2007200100032 according to private communication with author. 2007200100033 (19801107A) G.C. Monitor reaction corrected. 2007200100034 (20170127A) SD:Major revisions in 002 and 003. 2007200100035 ENDBIB 33 0 2007200100036 COMMON 2 3 2007200100037 MONIT EN-RSL-HW 2007200100038 PRT/FIS MEV 2007200100039 3.79 0.3 2007200100040 ENDCOMMON 3 0 2007200100041 ENDSUBENT 40 0 2007200199999 SUBENT 20072002 20170127 22572007200200001 BIB 6 22 2007200200002 REACTION (90-TH-232(N,F),PR,NU) 2007200200003 SAMPLE The total amount of Th-232 was approximately 220 mg 2007200200004 distributed on five plates, while the amount of Cf-252 2007200200005 gave about 80 spontaneous fissions per minute. 2007200200006 PART-DET (PN,FF) Prompt neutrons and fission fragments in 2007200200007 coincidence. 2007200200008 COMMENT .The values are in good agreement with earlier accurate2007200200009 measurements. 2007200200010 .The parameters of the equation 2007200200011 nu-bar(E(n)) = nu-bar(0) + a*E(n), where E(n) is the 2007200200012 neutron energy in MeV have been obtained by fitting a 2007200200013 straight line to the available data using the least 2007200200014 square method yielding nu-bar(En) = 1.87+0.177*En. 2007200200015 STATUS (SPSDD,20112002) Data have also been published by 2007200200016 H.Conde and M.Holmberg, Salzburg Conf.,vol.2,(1965)p.572007200200017 assuming different corrections. (See Subent 20112.002)2007200200018 nu-bar = 2.41+-0.10 at 3.6 +-0.3 MeV and 2007200200019 nu-bar = 4.32+-0.13 at 14.9+-0.3 MeV. 2007200200020 HISTORY (19710512T) From NEUDADA file 2007200200021 (19800822D) data superseded by EXFOR 20112.002 2007200200022 (20170127S) SD: Values were restored from EXFOR archive2007200200023 DATA-ERR -> ERR-S; NO-DIM -> PRT/FIS. 2007200200024 ENDBIB 22 0 2007200200025 NOCOMMON 0 0 2007200200026 DATA 3 2 2007200200027 EN DATA ERR-S 2007200200028 MEV PRT/FIS PRT/FIS 2007200200029 3.6 2.42 0.10 2007200200030 14.9 4.43 0.13 2007200200031 ENDDATA 4 0 2007200200032 ENDSUBENT 31 0 2007200299999 SUBENT 20072003 20170127 22572007200300001 BIB 6 18 2007200300002 REACTION (92-U-238(N,F),PR,NU) 2007200300003 SAMPLE The total amount of U-238 was approximately 80 mg 2007200300004 distributed on five plates, while the amount of Cf-252 2007200300005 gave about 80 spontaneous fissions per minute. 2007200300006 PART-DET (PN,FF) Prompt neutrons and fission fragments in 2007200300007 coincidence. 2007200300008 REL-REF (A,,B.D.Kuzminov+,J,JNE,9,153,1959) 2007200300009 (A,21453002,M.J.Leroy,J,CR,247,200,1958) 2007200300010 (A,12276002,A.B.Smith+,J,PR,115,1242,1959) 2007200300011 COMMENT .The parameters of the equation 2007200300012 nu-bar(E(n)) = nu-bar(0) + a*E(n), where E(n) is the 2007200300013 neutron energy in MeV have been obtained by fitting a 2007200300014 straight line to the available data using the least 2007200300015 square method yielding nu-bar(En) = 2.30+0.154*En. 2007200300016 HISTORY (19710512T) From NEUDADA file 2007200300017 (19800822A) 2007200300018 (20170127A) SD: REL-REF added. DATA-ERR -> ERR-S; 2007200300019 NO-DIM -> PRT/FIS. 2007200300020 ENDBIB 18 0 2007200300021 NOCOMMON 0 0 2007200300022 DATA 3 2 2007200300023 EN DATA ERR-S 2007200300024 MEV PRT/FIS PRT/FIS 2007200300025 3.6 2.79 0.09 2007200300026 14.9 4.75 0.12 2007200300027 ENDDATA 4 0 2007200300028 ENDSUBENT 27 0 2007200399999 ENDENTRY 3 0 2007299999999