ENTRY 21452 19801107 00002145200000001 SUBENT 21452001 19801107 00002145200100001 BIB 13 37 2145200100002 INSTITUTE (2FR SAC) 2145200100003 REFERENCE (C,58GENEVA,16,106,5809) 2145200100004 AUTHOR (P.BILLAUD,C.CLAIR,M.GAUDIN,R.GENIN,R.JOLY,J.L.LEROY, 2145200100005 A.MICHAUDON,J.OUVRY,C.SIGNARBIEUX,G.VENDRYES) 2145200100006 TITLE -MEASUREMENT OF THE FISSION CROSS SECTIONS AND NUMBER 2145200100007 OF PROMPT NEUTRONS EMITTED DURING FISSION.- 2145200100008 FACILITY (VDG,2FR SAC) 2 MEV VAN DE GRAAFF MACHINE HVEC. 2145200100009 INC-SOURCE (D-T ) DEUTERON-TRITIUM REACTION. TRITIUM-TREATED 2145200100010 ZIRCONIUM TARGET OF THICKNESS 35 KEV, 800 KEV 2145200100011 DEUTERONS. 2145200100012 SAMPLE .PREPARED BY ELECTROLYSIS ON AL OF U-OXIDE. SAMPLE WAS 2145200100013 ALPHA COUNTED FOR MASS DETERMINATION. THIS YIELDED 2145200100014 621 MG +- 2 PERC METALLIC URANIUM (SELFABSORPTION 2145200100015 AND BACKSCATTERING OF THE ALPHA PARTICLES WERE TAKEN 2145200100016 INTO ACCOUNT) 2145200100017 DETECTOR (COIN,FISCH,SCIN) COINCIDENCE BETWEEN THE ASSOCIATED 2145200100018 ALPHA PARTICLE FROM THE NEUTRON PRODUCTION AND THE 2145200100019 NEUTRON INDUCED FISSION FRAGMENT. THE ALPHAS ARE 2145200100020 DETECTED IN A 1 MM THICK PLASTIC SCINTILLATOR, 2145200100021 WITH A 8 MICRONS THICK AL ENTRANCE SHIELD TO STOP 2145200100022 DIFFUSED NEUTRONS. THE DETECTION EFFICIENCY IS 100. 2145200100023 PERCENT. THE FISSION FRAFMENTS ARE DETECTED IN A 2145200100024 FISSION CHAMBER (DETAILED DESCRIPTION OF DESIGN 2145200100025 SEE TEXT) FILLED WITH 3 KG/CM*CM MIXTURE OF 95 PERC 2145200100026 AR AND 5 PERC C-O(2), WITH A GAS FLOW OF 2 LITER/MIN. 2145200100027 PART-DET (FF ) FISSION FRAGMENTS, AND 2145200100028 (A ) NEUTRON PRODUCTION ASSOCIATED ALPHA PARTICLES. 2145200100029 STATUS (NDD ) DATA TAKEN FROM NEUDADA. 2145200100030 HISTORY (800303T) G.C. 2145200100031 (800318E) 2145200100032 CORRECTION .BACKSCATTERING AND SELFABSORPTION OF FISSION 2145200100033 FRAGMENTS. RANDOM COINCIDENCES. 2145200100034 ERR-ANALYS .MASS DETERMINATION, BACKSCATTERING AND SELFABSORPTION 2145200100035 CORRECTIONS FOR ALPHA PARTICLES ANF FISSION FRAGMENTS 2145200100036 LESS THAN 2 PERC. NEUTRON FLUX DETERMINATION ERROR 2145200100037 LESS THAN 3 PERC. STATISTICAL ACCURACY LESS THAN 5 2145200100038 PERC. TOTAL ERROR LESS THAN 10 PERC. 2145200100039 ENDBIB 37 0 2145200100040 NOCOMMON 0 0 2145200100041 ENDSUBENT 40 0 2145200199999 SUBENT 21452002 19800318 00002145200200001 BIB 2 2 2145200200002 REACTION (92-U-238(N,F),,SIG) 2145200200003 STATUS (NDD ) DATA TAKEN FROM NEUDADA. 2145200200004 ENDBIB 2 0 2145200200005 NOCOMMON 0 0 2145200200006 DATA 4 1 2145200200007 EN-MIN EN-MAX DATA DATA-ERR 2145200200008 MEV MEV B PER-CENT 2145200200009 1.3400E+01 1.3700E+01 1.0900E+00 1.0000E+01 2145200200010 ENDDATA 3 0 2145200200011 ENDSUBENT 10 0 2145200299999 ENDENTRY 2 0 2145299999999