ENTRY 21187 20060809 21782118700000001 SUBENT 21187001 20060809 21782118700100001 BIB 17 83 2118700100002 INSTITUTE (2UK ALD) 2118700100003 REFERENCE (J,JNE/AB,18,481,196409) 2118700100004 AUTHOR (J.F.BARRY,J.BUNCE,P.H.WHITE) 2118700100005 TITLE -CROSS-SECTION FOR THE REACTION U-238(N,G)U-239 IN 2118700100006 THE ENERGY RANGE 0.12-7.6 MEV- 2118700100007 FACILITY (VDG ) 3 MEV AND 5 MEV VAN DE GRAAFF GENERATORS. 2118700100008 INC-SOURCE (P-LI7) 120-500 KEV NEUTRONS. 2118700100009 .LI-F TARGET EVAPORATED ON SILVER BACKING, AIR COOLED 2118700100010 AND ROTATED TO USE CURRENTS UP TO 60 MICRO-A. 2118700100011 (P-T) 0.8-4.1 MEV NEUTRONS. 2118700100012 (D-D) 5.0-7.5 MEV NEUTRONS. 2118700100013 .TRITIUM AND DEUTERIUM GAS TARGETS WERE USED AT A 2118700100014 PRESSURE OF 1 ATM. CONTAINED IN 2.5 CM GAS CELL. 2118700100015 10 MICRO-AMP BEAM CURRENT INCIDENT THROUGH HE GAS 2118700100016 COOLED DOUBLE NICKEL WINDOWS. 2118700100017 INC-SPECT .NEUTRON ENERGY SPREAD DUE TO PROTON ENERGY LOSS AND 2118700100018 ANGLE SUBTENDED BY SAMPLE AT TARGET ABOUT 20 KEV FOR 2118700100019 P-LI7 NEUTRONS. 2118700100020 .FOR P-T AND D-D THE ENERGY SPREAD (150 KEV MAXIMUM) 2118700100021 HAS BEEN COMBINED WITH A POSSIBLE ENERGY ERROR OF 2118700100022 50 KEV. 2118700100023 SAMPLE .DISCS OF METALLIC URANIUM, 0.04 CM THICK AND 3.18 CM 2118700100024 IN DIAMETER, CONTAINING LESS THAN 0.2 PERCENT WEIGHT 2118700100025 OF IMPURITY AND 0.736 ATOM PERCENT OF U-235. 2118700100026 .DISCS DISSOLVED IN NITRIC ACID AFTER IRRADIATION TO 2118700100027 SEPARATE NEPTUNIUM WHICH WAS ELECTROLYTICALLY DEPOS- 2118700100028 ITED ONTO 2.54 CM DIAMETER, 0.025 CM THICK PT DISCS. 2118700100029 METHOD (ACTIV) MEASUREMENT OF BETA ACTIVITY AFTER U-238 2118700100030 IRRADIATION AND DELAY OF SEVERAL HOURS TO 2118700100031 ALLOW U-239 TO DECAY TO NP-239. 2118700100032 KNOWN AMOUNT OF NP-237 USED AS TRACER TO 2118700100033 MEASURE THE EFFICIENCY OF CHEMICAL PROCESSING 2118700100034 OF THE SAMPLE. 2118700100035 DETECTOR (PROPC) END-WINDOW GAS FLOW PROPORTIONAL COUNTER TO 2118700100036 MEASURE BETA ACTIVITY. 2118700100037 HYDROGEN FILLED PROPORTIONAL COUNTER FOR 2118700100038 ABSOLUTE FLUX CALIBRATION. 2118700100039 (FISCH) PAIR OF FISSION CHAMBERS ON EITHER SIDE OF THE 2118700100040 SAMPLE TO MEASURE RELATIVE NEUTRON FLUX. 2118700100041 FISSION CHAMBERS CALIBRATED AGAINST HYDROGEN 2118700100042 PROPORTIONAL COUNTER. 2118700100043 (LONGC) LONG COUNTER FLUX MONITOR. 2118700100044 (SCIN ) SCINTILLATION COUNTING OF ALPHA ACTIVITY OF 2118700100045 TRACER. 2118700100046 DECAY-DATA (93-NP-239,2.35D,B-,720.) 2118700100047 MONITOR (1-H-1(N,EL)1-H-1,,SIG) CROSS-SECTIONS RELATED TO 2118700100048 SCATTERING CROSS-SECTION OF H IN PROPORTIONAL 2118700100049 COUNTER. 2118700100050 PART-DET (B) BETAS FROM DECAY OF NP-239. 2118700100051 STATUS (NDD) FROM NEUDADA. 2118700100052 HISTORY (19791120T) 2118700100053 (19800110E) 2118700100054 (20060809A) DATE is corrected 2118700100055 CORRECTION .SEVERAL CORRECTIONS MADE FOR SCATTERING AND 2118700100056 BACKGROUND- 2118700100057 1.INELASTIC SCATTERING IN FISSION COUNTER MATERIALS 2118700100058 ABOVE 2 MEV, CORRECTION ABOUT (10+-10) PERCENT AT 2118700100059 THE HIGHEST ENERGY USED (7.6 MEV). SIMILAR CORR- 2118700100060 ECTION FOR SCATTERING IN TARGETS, (5+-5) PERCENT 2118700100061 AT 7.6 MEV. 2118700100062 2.BACKGROUND DUE TO ROOM SCATTERING AND PRODUCTION OF 2118700100063 NEUTRONS IN BEAM TUBES ETC., (0.4+-0.4) PERCENT. 2118700100064 3.BACKGROUND DUE TO DEUTERON INTERACTIONS WITH THE 2118700100065 NICKEL TARGET WINDOWS AND WITH DEUTERIUM ABSORBED 2118700100066 IN THE BEAM STOP, (20+-10) PERCENT AT 5 MEV, 2118700100067 (50+-20) PERCENT AT 7.6 MEV. 2118700100068 4.CORRECTION AT 7.6 MEV FOR BACKGROUND FROM DEUTERON 2118700100069 BREAKUP D(D,NP)D OF 8 PERCENT, CALCULATED USING THE 2118700100070 DATA OF L.CRANBERG,PHYS.REV.,104,(1956),1639. 2118700100071 .CORRECTION ALSO MADE FOR BUILD UP OF BETA ACTIVE 2118700100072 PA-233 FROM THE TRACER. 2118700100073 ERR-ANALYS .BELOW 800 KEV ERRORS MADE UP TYPICALLY OF- 2118700100074 FISSION COUNTER CALIBRATION................2% 2118700100075 FISSION COUNTER SCATTERING CORRECTION..... 1% 2118700100076 TARGET ROOM BACKGROUNDS................. 0.5% 2118700100077 TRACER ACTIVITY BACKGROUNDS............... 1% 2118700100078 EFFICIENCY OF BETA COUNTER................ 2% 2118700100079 NP-239 ACTIVITY DETERMINATION............. 2% 2118700100080 CHEMICAL YIELD DETERMINATION.............. 2% 2118700100081 OTHER ERRORS.............................. 1% 2118700100082 TOTAL ERROR 4.5 PERCENT. 2118700100083 .MUCH LARGER ERRORS AT 5 AND 7.6 MEV LARGELY DUE TO 2118700100084 THE NEUTRON BACKGROUND ESTIMATION. 2118700100085 ENDBIB 83 0 2118700100086 NOCOMMON 0 0 2118700100087 ENDSUBENT 86 0 2118700199999 SUBENT 21187002 20060809 21782118700200001 BIB 3 3 2118700200002 REACTION (92-U-238(N,G)92-U-239,,SIG) 2118700200003 STATUS .TABLE 1 OF THE PUBLICATION. 2118700200004 HISTORY (19791119T) 2118700200005 ENDBIB 3 0 2118700200006 NOCOMMON 0 0 2118700200007 DATA 5 13 2118700200008 EN EN-RSL DATA DATA-ERR MONIT 2118700200009 MEV MEV MB MB B 2118700200010 1.2700E-01 2.0000E-02 2.1800E+02 1.1000E+01 1.1730E+01 2118700200011 1.6000E-01 2.4000E-02 2.0000E+02 8.0000E+00 1.0670E+01 2118700200012 2.0700E-01 2.3000E-02 1.5800E+02 6.0000E+00 9.5500E+00 2118700200013 3.1200E-01 2.2000E-02 1.4100E+02 6.0000E+00 7.8900E+00 2118700200014 4.0400E-01 2.2000E-02 1.2600E+02 5.0000E+00 6.8500E+00 2118700200015 5.0500E-01 2.2000E-02 1.2800E+02 5.0000E+00 6.1300E+00 2118700200016 8.1000E-01 1.1000E-01 1.4700E+02 8.0000E+00 2118700200017 1.0600E+00 1.0500E-01 1.4900E+02 7.0000E+00 2118700200018 1.3000E+00 1.0500E-01 1.3000E+02 7.0000E+00 2118700200019 1.7500E+00 1.0500E-01 6.9000E+01 4.0000E+00 2118700200020 3.0000E+00 1.1500E-01 2.7000E+01 2.0000E+00 2118700200021 5.0000E+00 2.0000E-01 1.1000E+01 1.5000E+00 2118700200022 7.6000E+00 2.0000E-01 6.4000E+00 2.0000E+00 2118700200023 ENDDATA 15 0 2118700200024 ENDSUBENT 23 0 2118700299999 ENDENTRY 2 0 2118799999999