ENTRY 21252 20120917 22342125200000001 SUBENT 21252001 20120917 22342125200100001 BIB 6 31 2125200100002 TITLE Revision of the Harwell 240Pu source strength and nu 2125200100003 for 235U and 252Cf 2125200100004 INSTITUTE (2UK ALD) First five authors. 2125200100005 (2UK HAR) Last three. 2125200100006 REFERENCE (J,JNE/AB,20,549,196607) Revised nu for Cf-252. 2125200100007 (J,PR,133,B1403,196403) Revised nu for Cf-252, now 2125200100008 superseded. Measured prompt nu for U-235. 2125200100009 Authors: D.S.Mather,P.Fieldhouse,A.Moat 2125200100010 (J,JNE/AB,15,102,1961) Original measurement of nu for 2125200100011 Cf-252; nu for U-235, U-238 and Pu-240 measured 2125200100012 relative to this value. 2125200100013 Authors: D.S.Mather,M.H.Mctaggart,A.Moat 2125200100014 AUTHOR (P.Fieldhouse,E.R.Culliford,D.S.Mather,M.H.McTaggart, 2125200100015 A.Moat,M.G.Sowerby) - 2125200100016 full list of authors 2125200100017 FACILITY (VDG,2UK ALD) 3 MeV van de Graaff. 2125200100018 HISTORY (19791210T) 2125200100019 (19800118E) 2125200100020 (19800506A) DATA-ERR keywords added to Subents 006 2125200100021 and 007. 2125200100022 (19800603E) 2125200100023 (19810505A) ERR-ANALYS and REACTION string in Subents 2125200100024 007 and 008 corrected. 2125200100025 (19810722E) 2125200100026 (20040727A) Date is corrected. Reference corrected 2125200100027 (20041203A) three Subents restored 2125200100028 (20061205U) 2-nd reference corrected 2125200100029 (20061205U) last checking has been done. 2125200100030 (20120917A) SD: Updated to new date formats,lower case.2125200100031 Corrected according last EXFOR rules and Dict. 2125200100032 BIB update in all Subents. 2125200100033 ENDBIB 31 0 2125200100034 NOCOMMON 0 0 2125200100035 ENDSUBENT 34 0 2125200199999 SUBENT 21252002 20120917 22342125200200001 BIB 8 28 2125200200002 REACTION (98-CF-252(0,F),PR,NU) 2125200200003 SAMPLE .Cf-252 deposited over a 3 cm diameter region of a 2125200200004 0.002 inch thick platinum disk. Spontaneous fission 2125200200005 source consists of 91.5% 238Pu and 8.5% 240Pu, and is 2125200200006 contained in a 1 in. diam. spherical capsule. 2125200200007 METHOD .Comparison of neutron output with standard source 2125200200008 together with absolute determination of the fission 2125200200009 rate. 2125200200010 DETECTOR (BF3) 2 Detectors each consisting of a paraffin wax 2125200200011 cylinder with an axial hole and several BF-3 2125200200012 counters embedded in it symmetrically round 2125200200013 the axis to measure neutron yield. 2125200200014 (FISCH) Cf sample mounted on one plate of a parallel 2125200200015 plate fission chamber to measure fission rate. 2125200200016 STATUS (TABLE) Data from J.Nucl.Ener.,20,549,1966 2125200200017 REL-REF (R,13699003,S.Cox+,J,PR,112,960,1958) - Data for small 2125200200018 correction (see CORRECTION) 2125200200019 CORRECTION .Corrections applied for scaler dead-time, increase in 2125200200020 Pu source strength when inserted into the detector, 2125200200021 and softening of the Pu-240 source spectrum. 2125200200022 .Small correction for (0,f),dl,nu from Cox et al., 2125200200023 Phys.Rev.,112,(1958),960. 2125200200024 .Original data ( J.Nucl.Ener.,15,102,1961) 2125200200025 corrected for difference between Pu-240 and 2125200200026 Cf-252 spectra (Phys.Rev. B133,1403,1964) and 2125200200027 subsequently renormalized in the light of revised 2125200200028 strength for Pu-240 source (J.Nucl.Ener.,20,549,1966) 2125200200029 ERR-ANALYS (DATA-ERR) Not given 2125200200030 ENDBIB 28 0 2125200200031 NOCOMMON 0 0 2125200200032 DATA 2 1 2125200200033 DATA DATA-ERR 2125200200034 PRT/FIS PRT/FIS 2125200200035 3.6750E+00 4.0000E-02 2125200200036 ENDDATA 3 0 2125200200037 ENDSUBENT 36 0 2125200299999 SUBENT 21252003 20120917 22342125200300001 BIB 11 25 2125200300002 REACTION 1((94-PU-240(0,F),PR,NU)/(98-CF-252(0,F),PR,NU)) 2125200300003 2(94-PU-240(0,F),PR,NU) 2125200300004 SAMPLE 5 mg of 240Pu 2125200300005 METHOD .Comparison with nu for Cf-252 in loaded scintillator. 2125200300006 DETECTOR (SCIN ) 100 Litres of Cd-loaded Ne312 liquid scint- 2125200300007 illator in the shape of a 27 inch long by 18 2125200300008 inch diameter cylinder with 2.5 inch axial 2125200300009 tube in the centre. Scintillator loaded with 2125200300010 6% Cd and viewed by eight 5 inch EMI 2125200300011 6099 photomultipliers. Overall efficiency 65%. 2125200300012 (FISCH) Small continuous flow fission chamber placed 2125200300013 in axial tube to contain the sample. 2125200300014 MONITOR (98-CF-252(0,F),PR,NU) 2125200300015 PART-DET (N) Fission neutrons. 2125200300016 (FF) Fission fragments. 2125200300017 STATUS (TABLE) .Ratio taken from J.Nucl.Ener.,20,549,1966 2125200300018 CORRECTION .Correction for background and dead-time effects by 2125200300019 simulation techniques. 2125200300020 COMMENT .Data originally in Table 3 of J.Nucl.Ener.,15,102,19612125200300021 has been renormalized by the compiler (C.Wise) to the 2125200300022 updated Cf-252 nu value. 2125200300023 ERR-ANALYS (DATA-ERR1) Relative error. 2125200300024 (DATA-ERR2)Total error including error on nu for Cf-2522125200300025 HISTORY (19810505A) 2125200300026 (19810722E) 2125200300027 ENDBIB 25 0 2125200300028 COMMON 2 3 2125200300029 MONIT MONIT-ERR 2125200300030 PRT/FIS PRT/FIS 2125200300031 3.6750E+00 4.0000E-02 2125200300032 ENDCOMMON 3 0 2125200300033 DATA 4 1 2125200300034 DATA 1DATA-ERR1 1DATA 2DATA-ERR2 2 2125200300035 NO-DIM NO-DIM PRT/FIS PRT/FIS 2125200300036 5.7600E-01 6.0000E-03 2.1170E+00 2.2000E-02 2125200300037 ENDDATA 3 0 2125200300038 ENDSUBENT 37 0 2125200399999 SUBENT 21252004 20120917 22342125200400001 BIB 12 28 2125200400002 REACTION 1((92-U-238(N,F),PR,NU)/(98-CF-252(0,F),PR,NU)) 2125200400003 2(92-U-238(N,F),PR,NU) 2125200400004 INC-SOURCE (D-T) 1.0 MeV deuterons on tritium-zirconium 2125200400005 target for 14.2 MeV neutrons. 2125200400006 SAMPLE Multiplate chambers containing 130 mg natural uranium 2125200400007 METHOD .Comparison with nu for Cf-252 in loaded scintillator. 2125200400008 DETECTOR (SCIN ) 100 Litres of Cd-loaded Ne312 liquid scint- 2125200400009 illator in the shape of a 27 inch long by 18 2125200400010 inch diameter cylinder with 2.5 inch axial 2125200400011 tube in the centre. Scintillator loaded with 2125200400012 6% Cd and viewed by eight 5 inch EMI 6099 2125200400013 photomultipliers. Overall efficiency 65%. 2125200400014 (FISCH) Small continuous flow fission chamber placed 2125200400015 in axial tube to contain the sample. 2125200400016 MONITOR (98-CF-252(0,F),PR,NU) 2125200400017 PART-DET (N) Fission neutrons. 2125200400018 (FF) Fission fragments. 2125200400019 STATUS (TABLE) .Ratio taken from the table 3 of 2125200400020 J.Nucl.Ener.,15,102,1961. 2125200400021 COMMENT .Data originally in table 3 of J.Nucl.Ener.,15,102,19612125200400022 has been renormalized by the compiler (C.Wise) to the 2125200400023 updated Cf-252 nu value given in J.Nucl.Ener.,20,549. 2125200400024 HISTORY (19810505A) 2125200400025 (19810722E) 2125200400026 CORRECTION .Correction for background and dead-time effects by 2125200400027 simulation techniques. 2125200400028 ERR-ANALYS (DATA-ERR1) Relative error. 2125200400029 (DATA-ERR2)Total error including error on nu for Cf-2522125200400030 ENDBIB 28 0 2125200400031 COMMON 2 3 2125200400032 MONIT MONIT-ERR 2125200400033 PRT/FIS PRT/FIS 2125200400034 3.6750E+00 4.0000E-02 2125200400035 ENDCOMMON 3 0 2125200400036 DATA 5 1 2125200400037 EN DATA 1DATA-ERR1 1DATA 2DATA-ERR2 2 2125200400038 MEV NO-DIM NO-DIM PRT/FIS PRT/FIS 2125200400039 1.4200E+01 1.2030E+00 2.3000E-02 4.4210E+00 8.4000E-02 2125200400040 ENDDATA 3 0 2125200400041 ENDSUBENT 40 0 2125200499999 SUBENT 21252005 20120917 22342125200500001 BIB 12 31 2125200500002 REACTION 1((92-U-235(N,F),PR,NU)/(98-CF-252(0,F),PR,NU)) 2125200500003 2(92-U-235(N,F),PR,NU) 2125200500004 INC-SOURCE (P-T) 1.3 MeV protons on tritium-zirconium target 2125200500005 for 75 keV deuterons. 2125200500006 (D-D) 1.0 MeV deuterons on deuterium-zirconium 2125200500007 target for 2.5 MeV neutrons. 2125200500008 (D-T) 1.0 MeV deuterons on tritium-zirconium 2125200500009 target for 14.2 MeV neutrons. 2125200500010 SAMPLE Multiplate chambers containing 130 mg natural uranium 2125200500011 METHOD .Comparison with nu for Cf-252 in loaded scintillator. 2125200500012 DETECTOR (SCIN ) 100 Litres of Cd-loaded Ne312 liquid scint- 2125200500013 illator in the shape of a 27 inch long by 18 2125200500014 inch diameter cylinder with 2.5 inch axial 2125200500015 tube in the centre. Scintillator loaded with 2125200500016 6% Cd and viewed by eight 5 inch EMI 2125200500017 6099 photomultipliers. Overall efficiency 65%. 2125200500018 (FISCH) Small continuous flow fission chamber placed 2125200500019 in axial tube to contain the sample. 2125200500020 MONITOR (98-CF-252(0,F),PR,NU) 2125200500021 PART-DET (N) Fission neutrons. 2125200500022 (FF) Fission fragments. 2125200500023 STATUS (TABLE) .Ratio taken from J.Nucl.Ener.,20,549,1966. 2125200500024 COMMENT .Data originally in table 3 of J.Nucl.Ener.,15,102,19612125200500025 has been renormalized by the compiler (C.Wise) to the 2125200500026 updated Cf-252 nu value. 2125200500027 HISTORY (19810505A) 2125200500028 (19810722E) 2125200500029 CORRECTION .Correction for background and dead-time effects by 2125200500030 simulation techniques. 2125200500031 ERR-ANALYS (DATA-ERR1) Relative error. 2125200500032 (DATA-ERR2)Total error including error on nu for Cf-2522125200500033 ENDBIB 31 0 2125200500034 COMMON 2 3 2125200500035 MONIT MONIT-ERR 2125200500036 NO-DIM PRT/FIS 2125200500037 3.6750E+00 4.0000E-02 2125200500038 ENDCOMMON 3 0 2125200500039 DATA 5 3 2125200500040 EN DATA 1DATA-ERR1 1DATA 2DATA-ERR 2 2125200500041 MEV NO-DIM NO-DIM PRT/FIS PRT/FIS 2125200500042 7.5000E-02 6.4700E-01 8.0000E-03 2.3900E+00 5.0000E-02 2125200500043 2.5000E+00 7.0600E-01 1.6000E-02 2.5900E+00 6.0000E-02 2125200500044 1.4200E+01 1.1590E+00 6.0000E-03 4.2600E+00 5.0000E-02 2125200500045 ENDDATA 5 0 2125200500046 ENDSUBENT 45 0 2125200599999 SUBENT 21252006 20120917 22342125200600001 BIB 10 40 2125200600002 REACTION (92-U-235(N,F),PR,NU) 2125200600003 SAMPLE (92-U-235,ENR=0.9289) .About 170 mg of U-235 spread 2125200600004 over sixteen plates of one fission chamber separated 2125200600005 by 0.3 cm and with a 3 cm diameter coating. 2125200600006 Isotopic composition- 2125200600007 U-235 (92.89%),U-238 (5.69%), 2125200600008 U-234 (1.20%),U-236 (0.22%). 2125200600009 INC-SOURCE (P-T) 1.3 MeV protons on tritium-zirconium target 2125200600010 for 75 keV deuterons. 2125200600011 (D-D) 1.0 MeV deuterons on deuterium-zirconium 2125200600012 target for 2.5 MeV neutrons. 2125200600013 (D-T) 1.0 MeV deuterons on tritium-zirconium 2125200600014 target for 14.2 MeV neutrons. 2125200600015 METHOD .Comparison of neutron output with that of calibrated 2125200600016 Cf source in loaded scintillator, combined with 2125200600017 measurement of fission rate. 2125200600018 DETECTOR (SCIN ) About 240 litres of NE313 liquid scintillator 2125200600019 loaded into a 76 cm diameter sphere. Liquid 2125200600020 loaded with 0.5% (weight) of gadolinium 2125200600021 and viewed by twelve 5-inch diameter EMI 9618A 2125200600022 photomultipliers 2125200600023 (FISCH) continuous flow fission chamber (90% argon, 2125200600024 10% methane at atmospheric 2125200600025 pressure) to measure fission rate from sample. 2125200600026 Multi-plate chamber for U-235 sample, single 2125200600027 plate for Cf sample. Chambers placed at centre 2125200600028 of thin-walled 6.5 cm diameter tube running 2125200600029 diametrically through the scintillator. 2125200600030 MONITOR (98-CF-252(0,F),PR,NU) Monitor value of 3.782+-0.024 2125200600031 is the weighted mean of several measurements. 2125200600032 PART-DET (N) Fission neutrons. 2125200600033 (FF) Fission fragments. 2125200600034 STATUS (TABLE) .Table 6 of Phys.Rev.,B133,1403,196403. 2125200600035 HISTORY (19800506A) 2125200600036 (19800603E) 2125200600037 (19810505A) 2125200600038 (19810722E) 2125200600039 ERR-ANALYS (ERR-T) Error for absolute values. Includes 2125200600040 the monitor error. 2125200600041 (MONIT-ERR) Normalization error 2125200600042 ENDBIB 40 0 2125200600043 COMMON 2 3 2125200600044 MONIT MONIT-ERR 2125200600045 PRT/FIS PRT/FIS 2125200600046 3.7820E+00 2.4000E-02 2125200600047 ENDCOMMON 3 0 2125200600048 DATA 4 18 2125200600049 EN EN-RSL DATA ERR-T 2125200600050 MEV KEV PRT/FIS PRT/FIS 2125200600051 4.0000E-02 2.4200E+00 2.1000E-02 2125200600052 1.4000E-01 4.0000E+01 2.4230E+00 4.5000E-02 2125200600053 2.3000E-01 2.5000E+01 2.4900E+00 2.7000E-02 2125200600054 3.3000E-01 1.1500E+02 2.4780E+00 2.6000E-02 2125200600055 4.3000E-01 1.1500E+02 2.4750E+00 2.5000E-02 2125200600056 7.0000E-01 1.4500E+02 2.4570E+00 2.2000E-02 2125200600057 8.4000E-01 7.0000E+01 2.5290E+00 2.6000E-02 2125200600058 9.3000E-01 1.9000E+02 2.4990E+00 2.6000E-02 2125200600059 1.1700E+00 1.7500E+02 2.5570E+00 2.7000E-02 2125200600060 1.4700E+00 1.3000E+02 2.5830E+00 2.6000E-02 2125200600061 1.9400E+00 1.3500E+02 2.6560E+00 2.7000E-02 2125200600062 2.4400E+00 1.2000E+02 2.6890E+00 2.8000E-02 2125200600063 2.9600E+00 1.1000E+02 2.7510E+00 2.4000E-02 2125200600064 3.8700E+00 5.8000E+02 2.9330E+00 2.9000E-02 2125200600065 4.9100E+00 3.8500E+02 3.0740E+00 3.3000E-02 2125200600066 5.9400E+00 2.7000E+02 3.2730E+00 3.3000E-02 2125200600067 6.9600E+00 2.1000E+02 3.4900E+00 3.5000E-02 2125200600068 7.9600E+00 2.0500E+02 3.6660E+00 4.4000E-02 2125200600069 ENDDATA 20 0 2125200600070 ENDSUBENT 69 0 2125200699999 SUBENT 21252007 20120917 22342125200700001 BIB 10 38 2125200700002 REACTION (92-U-235(N,F),PR,NU,,MXW) 2125200700003 INC-SOURCE (P-LI7) Thermal neutrons were obtained by surrounding 2125200700004 the target with a 15 cm thickness of polyethylene 2125200700005 and producing low-energy neutrons (45-keV mean) 2125200700006 in a forward cone from Li7(p,n) induced by protons 2125200700007 8 keV above threshold. 2125200700008 SAMPLE .About 170 mg of U-235 spread over sixteen plates of 2125200700009 one fission chamber separated by 0.3 cm and with a 2125200700010 3 cm diameter coating. Isotopic composition- 2125200700011 U-235 (92.89%),U-238 (5.69%), 2125200700012 U-234 (1.20%),U-236 (0.22%). 2125200700013 METHOD .Comparison of neutron output with that of calibrated 2125200700014 Cf source in loaded scintillator, combined with 2125200700015 measurement of fission rate. 2125200700016 DETECTOR (SCIN ) About 240 litres of NE313 liquid scintillator 2125200700017 loaded into a 76 cm diameter sphere. Liquid 2125200700018 loaded with 0.5% (weight) of gadolinium 2125200700019 and viewed by twelve 5-inch diameter EMI 9618A 2125200700020 photomultipliers 2125200700021 (FISCH) continuous flow fission chamber (90% 2125200700022 argon, 10% methane at atmospheric 2125200700023 pressure) to measure fission rate from sample. 2125200700024 Multi-plate chamber for U-235 sample, single 2125200700025 plate for Cf sample. Chambers placed at centre 2125200700026 of thin-walled 6.5 cm diameter tube running 2125200700027 diametrically through the scintillator. 2125200700028 MONITOR (98-CF-252(0,F),PR,NU) Monitor value of 3.782+-0.024 2125200700029 is the weighted mean of several measurements. 2125200700030 PART-DET (N) Fission neutrons. 2125200700031 (FF) Fission fragments. 2125200700032 ERR-ANALYS (ERR-T) Error for absolute values. Includes 2125200700033 monitor error. 2125200700034 (MONIT-ERR) Normalization error 2125200700035 STATUS (TABLE) .Table 6 of Phys.Rev. B133,1403,196403. 2125200700036 HISTORY (19800506A) 2125200700037 (19800603E) 2125200700038 (19810505A) 2125200700039 (19810722E) 2125200700040 ENDBIB 38 0 2125200700041 COMMON 2 3 2125200700042 MONIT MONIT-ERR 2125200700043 PRT/FIS PRT/FIS 2125200700044 3.7820E+00 2.4000E-02 2125200700045 ENDCOMMON 3 0 2125200700046 DATA 3 1 2125200700047 EN-DUMMY DATA ERR-T 2125200700048 EV PRT/FIS PRT/FIS 2125200700049 0.0253 2.4120E+00 2.0000E-02 2125200700050 ENDDATA 3 0 2125200700051 ENDSUBENT 50 0 2125200799999 SUBENT 21252008 20120917 22342125200800001 BIB 5 17 2125200800002 REACTION ((92-U-235(N,F),PR,NU)//(92-U-235(N,F),PR,NU,,MXW)) 2125200800003 INC-SOURCE (P-T) 1.3 MeV protons on tritium-zirconium target 2125200800004 for 75 keV deuterons. 2125200800005 (D-D) 1.0 MeV deuterons on deuterium-zirconium 2125200800006 target for 2.5 MeV neutrons. 2125200800007 (D-T) 1.0 MeV deuterons on tritium-zirconium 2125200800008 target for 14.2 MeV neutrons. 2125200800009 ANALYSIS .From measured nu at various energies and in thermal 2125200800010 spectrum. 2125200800011 STATUS (TABLE) .Table 6 of Phys.Rev. B133,1403,196403. 2125200800012 (DEP,21252006) 2125200800013 (DEP,21252007) 2125200800014 HISTORY (19810505A) 2125200800015 (19810722E) 2125200800016 (20120917A) SD: EN-DN was added, EN -> EN-NM. Units of 2125200800017 EN-RSL were changed: KEV -> MEV (data were divided 2125200800018 by 1000.) 2125200800019 ENDBIB 17 0 2125200800020 COMMON 1 3 2125200800021 EN-DN 2125200800022 EV 2125200800023 0.0253 2125200800024 ENDCOMMON 3 0 2125200800025 DATA 4 18 2125200800026 EN-NM EN-RSL-NM DATA DATA-ERR 2125200800027 MEV MEV NO-DIM NO-DIM 2125200800028 4.0000E-02 1.0000E+00 8.0000E-03 2125200800029 1.4000E-01 4.0000E-02 1.0010E+00 2.3000E-02 2125200800030 2.3000E-01 2.5000E-02 1.0280E+00 1.0000E-02 2125200800031 3.3000E-01 1.1500E-01 1.0230E+00 1.0000E-02 2125200800032 4.3000E-01 1.1500E-01 1.0230E+00 1.0000E-02 2125200800033 7.0000E-01 1.4500E-01 1.0150E+00 8.0000E-03 2125200800034 8.4000E-01 7.0000E-02 1.0440E+00 1.0000E-02 2125200800035 9.3000E-01 1.9000E-01 1.0320E+00 1.0000E-02 2125200800036 1.1700E+00 1.7500E-01 1.0560E+00 1.0000E-02 2125200800037 1.4700E+00 1.3000E-01 1.0670E+00 1.0000E-02 2125200800038 1.9400E+00 1.3500E-01 1.0970E+00 1.0000E-02 2125200800039 2.4400E+00 1.2000E-01 1.1110E+00 1.1000E-02 2125200800040 2.9600E+00 1.1000E-01 1.1350E+00 9.0000E-03 2125200800041 3.8700E+00 5.8000E-01 1.2110E+00 1.1000E-02 2125200800042 4.9100E+00 3.8500E-01 1.2700E+00 1.3000E-02 2125200800043 5.9400E+00 2.7000E-01 1.3520E+00 1.2000E-02 2125200800044 6.9600E+00 2.1000E-01 1.4420E+00 1.3000E-02 2125200800045 7.9600E+00 2.0500E-01 1.5090E+00 1.7000E-02 2125200800046 ENDDATA 20 0 2125200800047 ENDSUBENT 46 0 2125200899999 ENDENTRY 8 0 2125299999999