ENTRY 22107 19890531 00002210700000001 SUBENT 22107001 19890531 00002210700100001 BIB 14 63 2210700100002 REFERENCE (C,88MITO,1049,88) 2210700100003 TITLE -MEASUREMENT OF THE NB-93(N,INL)NB-93-M CROSS SECTION 2210700100004 AT 7.9 MEV. 2210700100005 AUTHOR (M.WAGNER,G.WINKLER,H.VONACH,H.LISKIEN) 2210700100006 INSTITUTE (2ZZZGEL) H.LISKIEN AND EXPERIMENTAL SITE. 2210700100007 (2AUSIRK) M.WAGNER, G.WINKLER, H.VONACH. 2210700100008 FACILITY (VDG) CN-TYPE VAN DE GRAAFF ACCELERATOR AT GEEL. ABOUT 2210700100009 4 MICRO-AMPS OF DEUTERONS WERE ACCELERATED TO 5.091 2210700100010 +/- 0.005 MEV. 2210700100011 INC-SOURCE (D-D) 7.91 MEV NEUTRONS WERE PRODUCED BY THE D(D,N) 2210700100012 REACTION USING A 4 CM LONG AIR-JET COOLED GAS TARGET 2210700100013 CELL, OPERATED AT 1.5E+05 PA GAS PRESSURE, EQUIPPED 2210700100014 WITH A 3.29 MG/CM2 HAVAR ENTRANCE WINDOW AND A 0.5 MM 2210700100015 TA BEAM STOP. A BACKGROUND RUN WAS PERFORMED WITH THE 2210700100016 GAS CELL FILLED WITH HE. 2210700100017 METHOD (ACTIV) A FISSION CHAMBER WITH NIOBIUM AND MONITOR 2210700100018 FOILS MOUNTED INSIDE AND OUTSIDE THE CHAMBER WAS 2210700100019 PLACED AT 0 DEGREES RELATIVE TO THE DEUTERIUM BEAM AND2210700100020 AT A DISTANCE OF 6 MM FROM THE TARGET BEAM STOP. 2210700100021 DETECTOR (SOLST) A CALIBRATED SI(LI) X-RAY DETECTOR WAS USED FOR2210700100022 THE MEASUREMENT OF THE NIOBIUM K-SHELL X-RADIATION. 2210700100023 (FISCH) A FISSION CHAMBER, CONTAINING 168.4 +/- 2.1 2210700100024 MICROGRAMS OF U-238, ENRICHED TO 99.98 PERCENT, IN 2210700100025 FORM OF THE COMPOUND UF4, WAS USED. THE URANIUM 2210700100026 DEPOSIT WAS A 10 MM DIAMETER LAYER ON A 0.2 MM AL 2210700100027 BACKING. THE MASS OF U-238 WAS DETERMINED BY COMPARING2210700100028 WITH THE ACTIVITY IN AN ALUMINIUM FOIL AFTER 2210700100029 IRRADIATION WITH 14.8 MEV NEUTRONS, USING THE RATIO OF2210700100030 THE WELL-KNOWN CROSS SECTIONS FOR 2210700100031 13-AL-27(N,A)11-NA-24 AND 92-U-238(N,F). THE CROSS 2210700100032 SECTIONS USED WERE 112.10 MB +/- 0.6 PERCENT AND 2210700100033 1182.7 MB +/- 0.9 PERCENT, RESPECTIVELY. 2210700100034 (NAICR) A 12.7 CM BY 12.7 CM NAI(TL) WELL-TYPE DETECTOR2210700100035 WAS USED TO MEASURE THE CO-58 ACTIVITY FROM THE NICKEL2210700100036 FOILS. 2210700100037 (GELI) THE TA-182 ACTIVITY WAS MEASURED BY MEANS OF A 2210700100038 GE(LI) GAMMA-RAY DETECTOR. 2210700100039 MONITOR (92-U-238(N,F),,SIG) THE NEUTRON FLUENCE DETERMINED 2210700100040 WITH THE 10 MM DIAMETER FISSIONABLE MATERIAL WAS 2210700100041 INTERRELATED TO THE 20 MM DIAMETER NIOBIUM FOILS BY 2210700100042 ALSO IRRADIATING NICKEL FOILS WITH 20 MM DIAMETERS AND2210700100043 MEASURING THE CENTRAL AND OUTER PARTS SEPARATELY. 2210700100044 SAMPLE .A NIOBIUM FOIL, 20 MM DIAMETER AND 0.13 MM THICK, WITH2210700100045 A PURITY OF BETTER THAN 99.9 PERCENT, WAS USED. NICKEL2210700100046 FOILS WERE USED FOR SIZE NORMALISATION. A TANTALUM 2210700100047 FOIL, 20 MM IN DIAMETER AND 0.1 MM THICK WAS USED FOR 2210700100048 DETERMINING THE BACKGROUND FROM TANTALUM IMPURITIES IN2210700100049 THE NIOBIUM SAMPLES. THE FOILS WERE IRRADIATED FOR 60 2210700100050 HOURS, RESULTING IN A TOTAL NEUTRON FLUENCE OF 5.0E+122210700100051 N/CM2. 2210700100052 CORRECTION .CORRECTIONS WERE APPLIED FOR SELF-ABSORPTION IN THE 2210700100053 FOILS AND FOR THE EFFECTS OF THE EXTENSION OF THE 2210700100054 SOURCE. FURTHER, THE DATA WERE CORRECTED FOR FLOURE- 2210700100055 SCENCE CAUSED BY TA IMPURITIES IN THE NB SAMPLES, FOR 2210700100056 ELASTIC NEUTRON SCATTERING AND FOR BACKGROUND. 2210700100057 ERR-ANALYS (DATA-ERR) THE ERROR IS COMPOSED OF CONTRIBUTIONS FROM 2210700100058 THE MEASUREMENT OF THE NB-93 ACTIVITY AND FROM FLUENCE2210700100059 RELATED MEASUREMENTS. 2210700100060 STATUS .DATA TAKEN FROM MAIN REF. 2210700100061 HISTORY (881216C) N.O. 2210700100062 (890203E) 2210700100063 (890531U) IF. PAGE OF REFERENCE ADDED 2210700100064 (890919E) 2210700100065 ENDBIB 63 0 2210700100066 COMMON 5 3 2210700100067 EN EN-ERR EN-RSL MONIT MONIT-ERR 2210700100068 MEV MEV MEV MB PER-CENT 2210700100069 7.9100E+00 2.0000E-02 1.5000E-01 9.9250E+02 1.2000E+00 2210700100070 ENDCOMMON 3 0 2210700100071 ENDSUBENT 70 0 2210700199999 SUBENT 22107002 19890203 00002210700200001 BIB 4 5 2210700200002 REACTION (41-NB-93(N,INL)41-NB-93-M,,SIG) 2210700200003 DECAY-DATA (41-NB-93-M,16.1YR,XR,16.58,,XR,18.66) 2210700200004 STATUS .DATA TAKEN FROM MAIN REF. 2210700200005 HISTORY (881216C) N.O. 2210700200006 (890203E) 2210700200007 ENDBIB 5 0 2210700200008 NOCOMMON 0 0 2210700200009 DATA 2 1 2210700200010 DATA DATA-ERR 2210700200011 MB MB 2210700200012 2.6590E+02 9.8000E+00 2210700200013 ENDDATA 3 0 2210700200014 ENDSUBENT 13 0 2210700299999 ENDENTRY 2 0 2210799999999