ENTRY 21538 19810205 00002153800000001 SUBENT 21538001 19810205 00002153800100001 BIB 17 41 2153800100002 INSTITUTE (2FR ILL) EXPERIMENTAL SITE, M.ASGHAR. 2153800100003 (2BLGMOL) C.WAGEMANS. 2153800100004 (2FR GRE) F.CAITUCOLI, P.PERRIN. 2153800100005 (2BLGGHT) C.WAGEMANS, P.D'HONDT, A.J.DERUYTTER. 2153800100006 REFERENCE (J,ANE,5,267,7807) 2153800100007 AUTHOR (C.WAGEMANS,M.ASGHAR,F.CAITUCOLI,P.PERRIN,P.D'HONDT, 2153800100008 A.J.DERUYTTER) 2153800100009 TITLE -MEASUREMENT OF THE THERMAL NEUTRON-INDUCED FISSION 2153800100010 CROSS SECTION OF PA-231.- 2153800100011 FACILITY (REAC,2FR ILL) 87 M CURVED NEUTRON GUIDE OF HFR, 2153800100012 INCLINED BEAM HOLE IH1, THERMAL FLUX 5.E+09 NEUTRONS 2153800100013 /CM*CM*SEC, CD-RATIO 5.E+04. 2153800100014 INC-SOURCE (REAC ) THERMAL NEUTRONS FROM REACTOR. 2153800100015 SAMPLE .PREPARED BY THE CHEMISTRY DIVISION OF AERE-HARWELL. 2153800100016 THEY CONSITED OF A CIRCULAR SPOT, 10 MM DIAM, 2153800100017 EVAPORATED ONTO A 133 MICRO-GRAMS/CM*CM NI-FOIL. 2153800100018 LAYER THICKNESSES OF 35.16 +- 0.17 MICRO-GRAMS/CM*CM 2153800100019 PA-231-O(2) AND 44.9 +- 0.9 MICRO-GRAMS/CM*CM 2153800100020 NATURAL U(3)-O(8). THE PA-231 SAMPLE WAS PURIFIED 2153800100021 IMMEDIATLY PRIOR TO THE SOURCE PREPARATION IN ORDER 2153800100022 TO HAVE THE BASIC MATERIAL COMPLETELY FREE OF 2153800100023 DAUGHTER PRODUCTS. IT WAS ALSO COMPLETELY FREE OF 2153800100024 FISSILE ISOTOPES AS U-235 AND PU-239. 2153800100025 METHOD (COINC) COINCIDENCE. 2153800100026 DETECTOR (COIN,SOLST,SOLST) TWO 300 MM*MM SURFACE BARRIER 2153800100027 DETECTORS DETECTING THE TWO COMPLEMENTARY FISSION 2153800100028 FRAGMENTS IN COINCIDENCE, TO REDUCE THE BACKGROUND. 2153800100029 MONITOR (92-U-235(N,F),,SIG) 2200 M/SEC VALUE, 587.6 2153800100030 +- 2.6 B. 2153800100031 MONIT-REF (20143002,DERUYTTER+,J,JNE,27,645,73) 2153800100032 COMMENT .CONSISTENT WITH A CALCULATION OF WAGEMANS ET AL., 2153800100033 NP/A,285,32. IN DISAGREEMENT WITH A MEASUREMENT OF 2153800100034 GHIORSO ET AL (1952) TID-5223 II,593. 2153800100035 REL-REF (A,20824002,WAGEMANS+,J,NP/A,285,32,7707) 2153800100036 LESS PRECISE MEASUREMENT. 2153800100037 STATUS .TEXT, ANE,5,267. 2153800100038 HISTORY (800509C) G.C. 2153800100039 (800603E) 2153800100040 CORRECTION .NO CORRECTION WAS NECESSARY FOR FAST NEUTRON-INDUCED 2153800100041 FISSION. 2153800100042 ERR-ANALYS .NO DETAILS GIVEN. 2153800100043 ENDBIB 41 0 2153800100044 NOCOMMON 0 0 2153800100045 ENDSUBENT 44 0 2153800199999 SUBENT 21538002 19810205 00002153800200001 BIB 4 6 2153800200002 REACTION (91-PA-231(N,F),,SIG,,MXW) THERMAL NEUTRON-INDUCED 2153800200003 FISSION CROSS SECTION. 2153800200004 INC-SPECT .THERMAL MAXWELLIAN NEUTRON SPECTRUM FROM HFR. 2153800200005 STATUS .TEXT, ANE,5,267. 2153800200006 HISTORY (800509C) G.C. 2153800200007 (800603E) 2153800200008 ENDBIB 6 0 2153800200009 NOCOMMON 0 0 2153800200010 DATA 6 1 2153800200011 EN-DUMMY EN-NRM MONIT MONIT-ERR DATA DATA-ERR 2153800200012 EV EV B B MB MB 2153800200013 2.5300E-02 2.5300E-02 5.8760E+02 2.6000E+00 2.0000E+01 1.0000E+002153800200014 ENDDATA 3 0 2153800200015 ENDSUBENT 14 0 2153800299999 ENDENTRY 2 0 2153899999999