ENTRY 20453 19840120 00002045300000001 SUBENT 20453001 19840120 00002045300100001 BIB 14 46 2045300100002 INSTITUTE (2UK ALD) 2045300100003 REFERENCE ((R,AWRE-O-42/70,7008)=(P,EANDC(UK)-121,7008)) 2045300100004 (J,NP,66,149,6504) REFERS TO MEASUREMENTS OF FISSION 2045300100005 FOR PU-239, TH-232, U-233,-234,-238. SAME DETECTOR 2045300100006 AS IN THE PRESENT ONE BUT OLDER ELECTRONICS. 2045300100007 AUTHOR (D.S.MATHER, P.F.BAMPTON, G.JAMES, P.J.NIND) 2045300100008 TITLE -MEASUREMENTS OF PROMPT NU-BAR FOR 94-PU-239 BETWEEN 2045300100009 40 KEV AND 1.2 MEV.- 2045300100010 FACILITY (VDG ) AWRE 6 MV VAN DE GRAAFF. 2045300100011 INC-SOURCE (P-T ) ABOVE 300 KEV, T(P,N)-REACTION, T-GAS TARGET2045300100012 (P-LI7) BELOW 300 KEV, LI7(P,N)-REACTION, DEPOSITS 2045300100013 WERE OF LITHIUM NITRIDE ON 1 CM DIA PT DISCS. 2045300100014 INC-SPECT .THE GAS PRESSURE OF TRITIUM GAVE 100 KEV NEUTRON 2045300100015 ENERGY SPREAD AT EACH ENERGY (CALCULATED VALUE), 2045300100016 AND THE EXPECTED ENERGY LOSS IN THE MO WINDOW FOIL 2045300100017 FROM 260 TO 210 KEV. THE ABSOLUTE VALUE OF THE MEAN 2045300100018 NEUTRON ENERGIES WERE EXPECT TO LIE WITHIN +- 30 KEV 2045300100019 OF THE CALCULATED VALUES. 2045300100020 .FOR LI7(P,N)-REACTION, 2 TARGET THICKNESSES WERE USED 2045300100021 FOR COMPLETELY SEPARATE MEASUREMENTS IN THE 120 - 300 2045300100022 KEV BAND. THIS WAS BECAUSE DIFFICULTY IN GETTING A 2045300100023 UNIFORM NEUTRON YIELD ACROSS THE BAND WAS PREDICTED. 2045300100024 SAMPLE A CONTINUOUS-FLOW FISSION CHAMBER CONTAINING 2045300100025 45 MG OF PU (0.38 PERC OF PU-240) WAS USED. 2045300100026 METHOD DIRECT DETECTION OF FISSION NEUTRONS BY A 2045300100027 LARGE LIQUID SCINTILLATOR. 2045300100028 DETECTOR (SCIN) LARGE LIQUID SCINTILLATION COUNTER USED FOR 2045300100029 PREVIOUS PROMPT NU BAR MEASUREMENTS (MATHER ET AL., 2045300100030 PHYS.REV.133(1964)B1403 AND NUCL.PHYS.66(1965)149), 2045300100031 BUT WITH NEW ELECTRONICS. THE EFFICIENCY ABOUT 83 PC. 2045300100032 COMMENT A LEAST SQUARE FIT GIVES THE FORMULA, 2045300100033 R = (0.7660 +- 0.0053) + (0.0396 +- 0.0074) * E(N). 2045300100034 HISTORY (710518C) 2045300100035 (760112E) 2045300100036 CORRECTION .THE RAW NEUTRON MULTIPLICITY DATA WERE PROCESSED TO 2045300100037 SUBTRACT BACKGROUND AND CORRECT FOR DEAD TIME EFFECTS.2045300100038 .CORRECTION FOR THE ENERGY RESPONSE OF THE NEUTRON 2045300100039 DETECTOR. 2045300100040 .THE CORRECTION FOR RANDOM COINCIDENCES BETWEEN THE 2045300100041 FISSION CHAMBER AND LARGE SCINTILLATOR WERE LESS 3 PC.2045300100042 ERR-ANALYS ERRORS ON RATIO ( PROMPT NU BAR OF PU-239 TO CF-252) 2045300100043 FOR RELATIVE VALUES AND FOR ABSOLUTE VALUES ARE GIVEN,2045300100044 AND FOR ABSOLUTE VALUES OF R AN ADDITIONAL SYSTEMATIC 2045300100045 ERROR OF +- 0.6 PERCENT TO STANDARD DEVIATIONS FOR 2045300100046 RELATIVE VALUE (DOMINATED BY COUNTING STATISTICS) WAS 2045300100047 COMBINED. 2045300100048 ENDBIB 46 0 2045300100049 NOCOMMON 0 0 2045300100050 ENDSUBENT 49 0 2045300199999 SUBENT 20453002 19840120 00002045300200001 BIB 6 13 2045300200002 REACTION ((94-PU-239(N,F),PR,NU)/ 2045300200003 (98-CF-252(0,F),PR,NU)) 2045300200004 PART-DET (PN ) PROMPT NEUTRON. 2045300200005 COMMENT RESULTS OF PROMPT NU-BAR MEASUREMENTS OBTAINED WITH 2045300200006 LI-7(P,N) AND 100 KEV RESOLUTION ON T(P,N) NEUTRONS. 2045300200007 FLAG (1.) OBTAINED WITH THE LI-7 TARGET, ARRANGEMENT B- 2045300200008 TARGET THICKNESS= 550 MICRO-G. 2045300200009 (2.) OBTAINED WITH THE LI-7 TARGET, ARRANGEMENT C- 2045300200010 TARGET THICKNESS= 900 MICRO-G. 2045300200011 (3.) MEAN OF (1.)- AND (2.)-VALUES. 2045300200012 STATUS FROM TABLE 2, PAG. 9 OF THE PUBLICATION. 2045300200013 HISTORY (710518C) 2045300200014 (760112E) 2045300200015 ENDBIB 13 0 2045300200016 NOCOMMON 0 0 2045300200017 DATA 5 13 2045300200018 EN-MAX EN-MIN DATA DATA-ERR FLAG 2045300200019 MEV MEV NO-DIM NO-DIM NO-DIM 2045300200020 1.1500E-01 4.0000E-02 7.6500E-01 8.6000E-03 2045300200021 2.8500E-01 1.1500E-01 7.8280E-01 9.0000E-03 1.0000E+00 2045300200022 2.8500E-01 1.1500E-01 7.6810E-01 8.6000E-03 2.0000E+00 2045300200023 2.8500E-01 1.1500E-01 7.7540E-01 9.0000E-03 3.0000E+00 2045300200024 4.0000E-01 3.0000E-01 7.7380E-01 8.7000E-03 2045300200025 5.0000E-01 4.0000E-01 7.9330E-01 9.0000E-03 2045300200026 6.0000E-01 5.0000E-01 7.9640E-01 8.9000E-03 2045300200027 7.0000E-01 6.0000E-01 8.0230E-01 9.0000E-03 2045300200028 8.0000E-01 7.0000E-01 7.7950E-01 8.6000E-03 2045300200029 9.0000E-01 8.0000E-01 7.9690E-01 9.1000E-03 2045300200030 1.0000E+00 9.0000E-01 8.0460E-01 8.8000E-03 2045300200031 1.1000E+00 1.0000E+00 8.0700E-01 8.9000E-03 2045300200032 1.2000E+00 1.1000E+00 8.1340E-01 8.9000E-03 2045300200033 ENDDATA 15 0 2045300200034 ENDSUBENT 33 0 2045300299999 SUBENT 20453003 19840120 00002045300300001 BIB 5 8 2045300300002 REACTION ((94-PU-239(N,F),PR,NU)/ 2045300300003 (98-CF-252(0,F),PR,NU)) 2045300300004 PART-DET (PN ) PROMPT NEUTRON. 2045300300005 COMMENT RESULTS OF PROMPT NU-BAR MEASUREMENTS USING T(P,N) 2045300300006 NEUTRONS AND 50 KEV SPREAD. 2045300300007 STATUS FROM TABLE 3, PAG. 10 OF THE PUBLICATION. 2045300300008 HISTORY (710518C) 2045300300009 (760112E) 2045300300010 ENDBIB 8 0 2045300300011 NOCOMMON 0 0 2045300300012 DATA 4 7 2045300300013 EN-MAX EN-MIN DATA DATA-ERR 2045300300014 MEV MEV NO-DIM NO-DIM 2045300300015 5.7500E-01 5.2500E-01 7.8890E-01 1.1200E-02 2045300300016 6.2500E-01 5.7500E-01 7.7150E-01 1.1200E-02 2045300300017 6.7500E-01 6.2500E-01 8.1580E-01 1.3000E-02 2045300300018 7.2500E-01 6.7500E-01 8.1140E-01 1.2000E-02 2045300300019 7.7500E-01 7.2500E-01 7.9170E-01 1.3100E-02 2045300300020 8.2500E-01 7.7500E-01 7.9280E-01 1.1800E-02 2045300300021 8.7500E-01 8.2500E-01 7.8740E-01 1.1600E-02 2045300300022 ENDDATA 9 0 2045300300023 ENDSUBENT 22 0 2045300399999 ENDENTRY 3 0 2045399999999