ENTRY 22203 19961204 00002220300000001 SUBENT 22203001 19961204 00002220300100001 BIB 16 64 2220300100002 INSTITUTE (2JPNKTO) 2220300100003 REFERENCE (S,JAERI-M-91-032,245,9103) MAIN REF. 2220300100004 (S,NEANDC(J)-160,245,9103) IDENTICAL TO MAIN REF. 2220300100005 (S,INDC(JPN)-148,245,9103) IDENTICAL TO MAIN REF. 2220300100006 AUTHOR (H.CHATANI,I.KIMURA) 2220300100007 TITLE -MEASUREMENT OF TH-232(N,2N)TH-231 REACTION CROSS SEC- 2220300100008 TION WITH 14 MEV NEUTRONS. 2220300100009 FACILITY (CCW ) NEUTRON GENERATOR AT THE KYOTO UNIVERSITY CRI- 2220300100010 TICAL ASSEMBLIES, KUCA. 2220300100011 INC-SOURCE (D-T ) THE NEUTRONS WERE PRODUCED BY BOMBARDING A TI-T2220300100012 TARGET WITH A 212 KEV BEAM OF 20 MICROAMPS AVERAGE 2220300100013 BEAM CURRENT. 2220300100014 INC-SPECT .THE AVERAGE NEUTRON ENERGY WAS DETERMINED BY THE REAC-2220300100015 TION RATIO OF ZR-90(N,2N) AND NB-93(N,2N), USING FOUR 2220300100016 ZR AND FIVE NB FOILS AT A DISTANCE OF 4.4 CM FROM THE 2220300100017 TI-T TARGET. FROM THE OBTAINED REACTION RATIO 1.67+/- 2220300100018 0.04, THE AVERAGE NEUTRON ENERGY WAS DETERMINED TO 2220300100019 14.7+/-0.1 MEV. THE FLUX DISTRIBUTION AND ENERGY 2220300100020 SPECTRUM OF THE NEUTRONS IN THE THORIUM SAMPLES WERE 2220300100021 CALCULATED WITH THE MONTE CARLO CODE MCNP, USING THE 2220300100022 OKTAVIAN SOURCE NEUTRON SPECTRUM. 2220300100023 SAMPLE .THREE POLYETHYLENE PACKS OF THORIUM NITRATE POWDER OF 2220300100024 ABOUT 500 MG WEIGHT WERE USED. THE THORIUM SAMPLES 2220300100025 WERE SANDWICHED WITH 0.5 MM THICK ALUMINUM FOILS FOR 2220300100026 NEUTRON FLUENCE MONITORING. THE DISTANCE BETWEEN THE 2220300100027 TI-T TARGET AND THE FRONT SURFACE OF THE SAMPLES WAS 2220300100028 1.6 CM. THE SAMPLES WERE IRRADIATED FOR ABOUT 7.5 HRS.2220300100029 AFTER IRRADIATION THE SAMPLES WERE CHEMICALLY PURI- 2220300100030 FIED. 2220300100031 METHOD (ACTIV) 2220300100032 DETECTOR (HPGE ) THE ACTIVITIES WERE MEASURED WITH A CALIBRATED 2220300100033 PURE GERMANIUM DETECTOR. THE ABSOLUTE TH-231 ACTIVITY 2220300100034 WAS DETERMINED BY COMPARISON WITH THE ACTIVITY FROM 2220300100035 A 90 PERCENT ENRICHED URANIUM-ALUMINUM ALLOY WHICH 2220300100036 CONTAINS TH-231. 2220300100037 .THE TIME DEPENDENCE OF THE NEUTRON FLUX WAS MONITORED 2220300100038 USING A MODERATOR TYPE NEUTRON DOSE RATE METER LOCATED2220300100039 ABOUT 2 M FROM THE TI-T TARGET. 2220300100040 PART-DET (DG ) 2220300100041 MONITOR (13-AL-27(N,A)11-NA-24-G,,SIG) THE MONITOR CROSS SEC- 2220300100042 TION WAS DETERMINED BY INTERPOLATION OF ENDF/B-V. 2220300100043 CORRECTION .CORRECTIONS WERE APPLIED FOR RANDOM, CHANCE AND SUM- 2220300100044 MING COINCIDENCES. CORRECTIONS WERE ALSO APPLIED FOR 2220300100045 GAMMA SELF ABSORPTION AND GEOMETRICAL EFFECTS. 2220300100046 ERR-ANALYS (ERR-T) TOTAL ERROR, CONTAINING THE FOLLOWING CON- 2220300100047 TRIBUTIONS (PERCENT). 2220300100048 (ERR-1) TH SAMPLE COUNTING STATISTICS ERROR 2220300100049 (ERR-2) TH SAMPLE RECOVERY OF TH ERROR 2220300100050 (ERR-3) TH SAMPLE EFFICIENCY OF HPGE AT 84 KEV ERROR 2220300100051 (ERR-4) TH SAMPLE SELF ABSORPTION ERROR 2220300100052 (ERR-5) NEUTRON FLUENCE MONITOR COUNTING STATISTICS 2220300100053 ERROR 2220300100054 (ERR-6) NEUTRON FLUENCE MONITOR PURITY OF AL FOILS 2220300100055 ERROR 2220300100056 (ERR-7) NEUTRON FLUENCE MONITOR EFFICIENCY OF HPGE 2220300100057 AT 1.37 MEV ERROR 2220300100058 (ERR-8) NEUTRON FLUENCE MONITOR FLUX DISTRIBUTION 2220300100059 ERROR 2220300100060 (ERR-9) OTHER ERRORS 2220300100061 STATUS .DATA TAKEN FROM MAIN REF. 2220300100062 HISTORY (930103C) N.O. 2220300100063 (930329E) 2220300100064 (961204U) + + CORRECTED BY S.MAEV 2220300100065 ERROR STRUCTURE GIVEN IN RETRIEVABLE FORM + + 2220300100066 ENDBIB 64 0 2220300100067 COMMON 9 6 2220300100068 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-6 2220300100069 ERR-7 ERR-8 ERR-9 2220300100070 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2220300100071 PER-CENT PER-CENT PER-CENT 2220300100072 0.37 1. 1.2 1.8 0.5 0.56 2220300100073 3.1 5. 2. 2220300100074 ENDCOMMON 6 0 2220300100075 ENDSUBENT 74 0 2220300199999 SUBENT 22203002 19961204 00002220300200001 BIB 3 6 2220300200002 REACTION (90-TH-232(N,2N)90-TH-231,,SIG) 2220300200003 DECAY-DATA (90-TH-231,25.52HR,DG,81./82./84.) 2220300200004 HISTORY (930103C) N.O. 2220300200005 (930329E) 2220300200006 (961204U) * * DATA-ERR REPLACED BY ERR-T 2220300200007 STATUS KEYWORD DELETED AS DUPLICATED IN SAN 001 * * 2220300200008 ENDBIB 6 0 2220300200009 NOCOMMON 0 0 2220300200010 DATA 6 1 2220300200011 EN EN-ERR DATA ERR-T ERR-T MONIT 2220300200012 MEV MEV MB MB PER-CENT MB 2220300200013 1.4700E+01 1.0000E-01 1.1770E+03 7.9000E+01 6.7 1.1730E+022220300200014 ENDDATA 3 0 2220300200015 ENDSUBENT 14 0 2220300299999 ENDENTRY 2 0 2220399999999