ENTRY 22088 19890530 00002208800000001 SUBENT 22088001 19890530 00002208800100001 BIB 15 45 2208800100002 REFERENCE (C,88MITO,153,88) 2208800100003 TITLE -MEASUREMENT OF TOTAL NEUTRON CROSS SECTION FOR SM, GD 2208800100004 AND DY IN THE THERMAL ENERGY REGION. 2208800100005 AUTHOR (K.HIGURASHI,O.AIZAWA,T.MATSUMOTO,H.KADOTANI) 2208800100006 INSTITUTE (2JPNJPN) ATOMIC ENERGY RESEARCH LABORATORY, MUSASHI 2208800100007 INST. OF TECHN., KAWASAKI. K.H., O.A., T.M. 2208800100008 (2JPNJPN) CENTURY RESEARCH CENTER CORPORATION, TOKYO, 2208800100009 H.K. 2208800100010 FACILITY (REAC) TRIGA-II, 100 KW REACTOR AT MUSASHI. 2208800100011 INC-SOURCE (REAC) THERMAL NEUTRONS FROM THE REACTOR, FILTERED 2208800100012 THROUGH A 30 CM LONG NEARLY PERFECT SINGLE CRYSTAL 2208800100013 SILICON ROD. BEAM BURSTS OF 275 MICROSEC LENGTH (FWHM)2208800100014 WAS OBTAINED BY A BORON-NITRIDE CHOPPER, 12 CM IN DIA-2208800100015 METER AND 12 CM HIGH, HAVING NINE SLITS OF 0.4 CM X 2208800100016 7.0 CM. THE ROTATION FREQUENCY WAS 2000 RPM. THE 2208800100017 NEUTRON BEAM WAS COLLIMATED TO 4 CM DIAMETER. THE 2208800100018 ENERGY RESOLUTION WAS 18 PERCENT AT 0.0253 EV. 2208800100019 INC-SPECT .SILICON FILTERED THERMAL NEUTRON SPECTRUM. 2208800100020 METHOD (TOF) TRANSMISSION MEASUREMENT USING TIME-OF-FLIGHT 2208800100021 TECHNIQUES WITH A FLIGHT PATH OF 6.77 M. 2208800100022 DETECTOR (BF3) THREE BORON-TRIFLOURIDE COUNTERS WERE SET AT THE 2208800100023 END OF THE FLIGHT PATH. 2208800100024 SAMPLE .SAMPLES OF 99.9 PERCENT PURITY SM2O3, GD2O3 AND DY2O3 2208800100025 WERE USED. THE OXIDE POWDER WAS DILUTED WITH AL METAL 2208800100026 POWDER OF 99.98 PERCENT PURITY. THE SAMPLE HOLDER WAS 2208800100027 A CYLINDER, 64MM IN DIAMETER AND 20 MM THICK, MADE OF 2208800100028 ALUMINUM. THE DENSITY OF THE SAMPLES WAS ADJUSTED TO 2208800100029 GIVE 20 PERCENT TRANSMISSION. 2208800100030 .THE BACKGROUND WAS MEASURED BY COVERING THE SAMPLES 2208800100031 WITH A CADMIUM PLATE OF 1.3 MM THICKNESS. 2208800100032 CORRECTION .THE TRANSMITTED SPECTRA WERE CORRECTED FOR MEASURING 2208800100033 TIME, NUMBER OF CHOPPER ROTATIONS, THE MONITORED 2208800100034 REACTOR POWER AND THE BACKGROUND NEUTRON COUNTS. 2208800100035 ERR-ANALYS (DATA-ERR) THE TOTAL ERRORS WERE COMPOSED OF THE 2208800100036 FOLLOWING CONTRIBUTIONS. DENSITY OF THE SAMPLE, THICK-2208800100037 NESS OF THE SAMPLE, STATISTICAL ERROR OF SIGNAL AND 2208800100038 MONITOR NEUTRON COUNTING. 2208800100039 ANALYSIS .TOTAL CROSS SECTIONS WERE OBTAINED BY DIVIDING THE 2208800100040 OPEN BEAM SPECTRUM BY THE TRANSMITTED NEUTRON 2208800100041 SPECTRUM. 2208800100042 STATUS .DATA WERE TAKEN FROM THE MAIN REF. 2208800100043 HISTORY (881202C) N.O. 2208800100044 (881216E) 2208800100045 (890530U) IF. PAGE ADDED TO THE MAIN REFERENCE 2208800100046 (890919E) 2208800100047 ENDBIB 45 0 2208800100048 COMMON 2 3 2208800100049 EN-DUMMY EN-RSL 2208800100050 EV EV 2208800100051 2.5300E-02 2.3000E-03 2208800100052 ENDCOMMON 3 0 2208800100053 ENDSUBENT 52 0 2208800199999 SUBENT 22088002 19881216 00002208800200001 BIB 3 4 2208800200002 REACTION (62-SM-0(N,TOT),,SIG,,SPA) 2208800200003 STATUS .DATA WERE TAKEN FROM THE MAIN REF. 2208800200004 HISTORY (881202C) N.O. 2208800200005 (881216E) 2208800200006 ENDBIB 4 0 2208800200007 NOCOMMON 0 0 2208800200008 DATA 2 1 2208800200009 DATA DATA-ERR 2208800200010 B B 2208800200011 5.4280E+03 8.7000E+01 2208800200012 ENDDATA 3 0 2208800200013 ENDSUBENT 12 0 2208800299999 SUBENT 22088003 19881216 00002208800300001 BIB 3 4 2208800300002 REACTION (64-GD-0(N,TOT),,SIG,,SPA) 2208800300003 STATUS .DATA WERE TAKEN FROM THE MAIN REF. 2208800300004 HISTORY (881202C) N.O. 2208800300005 (881216E) 2208800300006 ENDBIB 4 0 2208800300007 NOCOMMON 0 0 2208800300008 DATA 2 1 2208800300009 DATA DATA-ERR 2208800300010 B B 2208800300011 4.4450E+04 7.0100E+02 2208800300012 ENDDATA 3 0 2208800300013 ENDSUBENT 12 0 2208800399999 SUBENT 22088004 19881216 00002208800400001 BIB 3 4 2208800400002 REACTION (66-DY-0(N,TOT),,SIG,,SPA) 2208800400003 STATUS .DATA WERE TAKEN FROM THE MAIN REF. 2208800400004 HISTORY (881202C) N.O. 2208800400005 (881216E) 2208800400006 ENDBIB 4 0 2208800400007 NOCOMMON 0 0 2208800400008 DATA 2 1 2208800400009 DATA DATA-ERR 2208800400010 B B 2208800400011 1.0410E+03 2.1000E+01 2208800400012 ENDDATA 3 0 2208800400013 ENDSUBENT 12 0 2208800499999 ENDENTRY 4 0 2208899999999