ENTRY 21848 19830429 00002184800000001 SUBENT 21848001 19830429 00002184800100001 BIB 14 70 2184800100002 INSTITUTE (2GERKFK) 2184800100003 REFERENCE (J,JNE,22,505,6808) MAIN REFERENCE. 2184800100004 (C,67KARLSR,1,67,6711) 2184800100005 (R,KFK-635,6710) 2184800100006 AUTHOR (W.P.POENITZ,D.KOMPE,H.O.MENLOVE) 2184800100007 TITLE -THE NEUTRON CAPTURE CROSS SECTION OF GOLD IN THE 2184800100008 KEV ENERGY REGION-. 2184800100009 FACILITY (VDG ) 3 MEV VAN DE GRAAFF ACCELERATOR. 2184800100010 INC-SOURCE (P-LI7) THE LI-7(P,N) REACTION, USING A TARGET OF 2184800100011 A METALLIC LI LAYER EVAPORATED ON A TANTALUM 2184800100012 BACKING. 2184800100013 SAMPLE .THE GOLD SAMPLE WAS A 1 MM THICK DISK WITH A 2184800100014 DIAMETER OF 9 CM. 2184800100015 METHOD (TOF ) TIME OF FLIGHT TECHNIQUES. 2184800100016 DETECTOR (STANK) THE GAMMA-RAY DETECTOR WAS A 110 CM DIA. 2184800100017 TANK FILLED WITH 800 LITERS OF LIQUID SCINTILLATOR 2184800100018 SOLUTION WITH 12 PHOTOMULTIPLIERS AT THE SURFACE 2184800100019 OF THE TANK. 2184800100020 (NAICR) A GREY NEUTRON DETECTOR WAS USED TO MONITOR 2184800100021 THE NEUTRON FLUX. THE DETECTOR, THAT HAS A FLAT 2184800100022 DETECTION EFFICIENCY CURVE OVER THE KEV NEUTRON 2184800100023 ENERGY REGION, CONSISTED OF A PARAFFIN PILE VIEWED 2184800100024 BY A 4 INCH BY 5 INCH NAI(TL) DETECTOR. 2184800100025 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) A FITTED VALUE AT 2184800100026 30 KEV WAS USED FOR NORMALIZATION. 2184800100027 STATUS .DATA TAKEN FROM MAIN REFERENCE. 2184800100028 HISTORY (830422C) 2184800100029 (830429E) 2184800100030 CORRECTION .FOR- 2184800100031 - THE RELATION BETWEEN THE EXPERIMENTALLY 2184800100032 DETERMINED AVERAGE CROSS SECTION AND THE 2184800100033 AVERAGE ENERGY, 2184800100034 - CAPTURE EVENTS WHICH ARE DUE TO NEUTRONS 2184800100035 SCATTERED IN THE SAMPLE BOTH ELASTICALLY 2184800100036 OR INELASTICALLY, 2184800100037 - RESONANCE SELF-SHIELDING, 2184800100038 - THE COUNT RATE IN THE GREY NEUTRON DETECTOR 2184800100039 DUE TO THE LOWER NEUTRON GROUP, 2184800100040 - AIR SCATTERING OF THE NEUTRONS, 2184800100041 - THE FACT THAT THE FRACTION OF THE PULSE-HEIGHT 2184800100042 SPECTRA FROM THE CAPTURE TANK ABOVE THE 2184800100043 DISCRIMINATOR BIAS LEVEL WAS SLIGHTLY INCREASED 2184800100044 WITH INCREASING ENERGY. 2184800100045 ERR-ANALYS (ERR-T) TOTAL UNCERTAINTY GIVEN IN DATA TABLE. 2184800100046 .OTHER UNCERTAINTIES VARY WITH NEUTRON ENERGY AND 2184800100047 THE DIFFERENT CONTRIBUTIONS ARE GIVEN IN TABLE 3 2184800100048 AS FOLLOWS, 2184800100049 - STATISTICAL ERROR OF THE N,G COUNTS 0.8-3.0 PC, 2184800100050 - STATISTICAL ERROR OF THE NEUTRON 2184800100051 COUNTS 0.5-2.5 PC, 2184800100052 - GREY NEUTRON DETECTOR EFFICIENCY 0.0-0.7 PC, 2184800100053 - CORRECTION FOR ELASTICALLY SCATTERED 2184800100054 NEUTRONS AND RESON. SELF-SHIELDING 0.0-1.0 PC, 2184800100055 - CORRECTIONS FOR INELASTICALLY 2184800100056 SCATTERED NEUTRONS 0.0-0.4 PC, 2184800100057 - CORRECTION FOR SCATTERING OF 2184800100058 NEUTRONS IN AIR 0.0-0.4 PC, 2184800100059 - CONTRIBUTION OF LOW-ENERGY NEUTRONS 0.0-2.0 PC, 2184800100060 - ANISOTROPIC EFFECT ON THE EFFICIENCY 2184800100061 OF THE GREY NEUTRON DETECTOR 0.0-2.0 PC, 2184800100062 - CORRECTION FOR CHANGE OF MAXIMUM 2184800100063 GAMMA-RAY ENERGY 0.0-0.5 PC, 2184800100064 - BIAS SHIFT IN THE CAPTURE GAMMA-RAY 2184800100065 CHANNEL 1.0 PC, 2184800100066 - UNCERTAINTY IN THE FIT OF THE 2.2MEV 2184800100067 GAMMA-RAY SPECTRA OF THE NEUTRON 2184800100068 COUNTER 1.0-2.1 PC, 2184800100069 - GAMMA-SPECTRUM FRACTION CHANGE 0.0-4.0 PC, 2184800100070 - NORMALIZATION AT 30 KEV 3.0 PC. 2184800100071 THE ERROR IS 0.0 AT THE NORMALIZATION POINT. 2184800100072 ENDBIB 70 0 2184800100073 COMMON 3 3 2184800100074 EN-NRM MONIT MONIT-ERR 2184800100075 KEV B B 2184800100076 3.0000E+01 5.9600E-01 1.2000E-02 2184800100077 ENDCOMMON 3 0 2184800100078 ENDSUBENT 77 0 2184800199999 SUBENT 21848002 19830429 00002184800200001 BIB 3 4 2184800200002 REACTION (79-AU-197(N,G)79-AU-198,,SIG) 2184800200003 STATUS .TABLE 2 IN MAIN REFERENCE. 2184800200004 HISTORY (830422C) 2184800200005 (830429E) 2184800200006 ENDBIB 4 0 2184800200007 NOCOMMON 0 0 2184800200008 DATA 4 22 2184800200009 EN EN-ERR DATA ERR-T 2184800200010 KEV KEV MB MB 2184800200011 2.4700E+01 1.3000E+00 6.7600E+02 3.2000E+01 2184800200012 2.5000E+01 9.0000E-01 6.3900E+02 3.1000E+01 2184800200013 3.0800E+01 1.3000E+00 5.9100E+02 3.0000E+01 2184800200014 3.6000E+01 1.6000E+00 4.8800E+02 2.2000E+01 2184800200015 4.4600E+01 2.3000E+00 4.5900E+02 2.0000E+01 2184800200016 4.7400E+01 1.7000E+00 4.5700E+02 1.9000E+01 2184800200017 5.0900E+01 1.8000E+00 4.4700E+02 1.8000E+01 2184800200018 5.8300E+01 2.6000E+00 4.2200E+02 1.9000E+01 2184800200019 6.1900E+01 2.7000E+00 3.9700E+02 1.6000E+01 2184800200020 8.2300E+01 3.0000E+00 3.4000E+02 1.6000E+01 2184800200021 8.8800E+01 3.0000E+00 3.1800E+02 1.3000E+01 2184800200022 1.0330E+02 3.0000E+00 3.2800E+02 1.4000E+01 2184800200023 1.3400E+02 3.0000E+00 2.9400E+02 1.3000E+01 2184800200024 1.5300E+02 5.0000E+00 2.7500E+02 1.4000E+01 2184800200025 1.7100E+02 4.0000E+00 2.7300E+02 1.6000E+01 2184800200026 1.7900E+02 4.0000E+00 2.6800E+02 1.3000E+01 2184800200027 1.8400E+02 4.0000E+00 2.6500E+02 1.5000E+01 2184800200028 1.9100E+02 3.0000E+00 2.6300E+02 1.5000E+01 2184800200029 2.2700E+02 4.0000E+00 2.5000E+02 1.5000E+01 2184800200030 2.8000E+02 7.0000E+00 2.0900E+02 1.4000E+01 2184800200031 3.4200E+02 8.0000E+00 1.8500E+02 1.1000E+01 2184800200032 4.7300E+02 1.0000E+01 1.4200E+02 9.0000E+00 2184800200033 ENDDATA 24 0 2184800200034 ENDSUBENT 33 0 2184800299999 ENDENTRY 2 0 2184899999999