ENTRY 20587 19840126 00002058700000001 SUBENT 20587001 19840126 00002058700100001 BIB 16 39 2058700100002 INSTITUTE (2FR ILL) M.ASGHAR, EXPERIENCE SITE. 2058700100003 (2BLGMOL) C.WAGEMANS 2058700100004 (2BLGBLG) NUCLEAR PHYSICS LABORATORY,GENT. P.DHONT, 2058700100005 J.DERUYTTER. 2058700100006 (2FR LYO) A.EMSALLEM. 2058700100007 REFERENCE (J,NP/A,259,(3),423,7603) 2058700100008 AUTHOR (C.WAGEMANS,P.DHONDT,J.DERUYTTER,A.EMSALLEM, 2058700100009 M.ASGHAR) 2058700100010 TITLE -THE THERMAL NEUTRON INDUCED FISSION CROSS SECTION 2058700100011 OF TH232- 2058700100012 FACILITY .HIGH FLUX REACTOR OF THE LAUE-LANGEVIN INSTITUTE, 2058700100013 GRENOBLE. 2058700100014 INC-SOURCE (THCOL) 87 M CURVED NEUTRON GUIDE TUBE. 2058700100015 INC-SPECT .VERY PURE THERMAL SPECTRUM. RATIO OF THE NUMBER 2058700100016 OF SLOW NEUTRONS TO THAT OF EPITHERMAL AND FAST 2058700100017 NEUTRONS ABOUT 1.E+6. DIRECT GAMMA-RAY FLUX FROM 2058700100018 REACTOR REDUCED BY A FACTOR 1.E+6. 2058700100019 .VERY INTENSE NEUTRON FLUX = 1.E+9 CM-2.SEC-1. 2058700100020 SAMPLE .ELECTROSPAY OF ULTRA PURE TH232 OXYDE ON A AL FOIL 2058700100021 OF 20 MICRO-M OF THICKNESS. THICKNESS OF TH SAMPLE 2058700100022 360+-6 MICRO-G/CM**2 SPREAD OVER 60*50 MM**2. 2058700100023 METHOD (PHD ) PULSE-HEIGHT ANALYSIS. 2058700100024 DETECTOR (SOLST) GOLD-SILICON SURFACE BARRIER DETECTOR,AREA 2058700100025 450. MM**2. 2058700100026 MONITOR (92-U-235(N,F),,SIG,,MXW)= 2058700100027 587.6+-2.6 B. NEUTRON FLUX 2058700100028 DETERMINED REPLACING THE TH SAMPLE BY A NATURAL 2058700100029 URANIUM FOIL. 2058700100030 COMMENT .PRESENT VALUE IN AN ORDER OF MAGNITUDE SMALLER THAN 2058700100031 ALL THE PREVIOUS RESULTS. IT IS CONSISTENT WITH THE 2058700100032 DOUBLE-HUMPED FISSION BARRIER THEORY. 2058700100033 STATUS .DATA TAKEN FROM P.425 OF REFERENCE NUCL.PHYS.,A259 2058700100034 (1976)423. 2058700100035 HISTORY (760811C) 2058700100036 (761217E) 2058700100037 CORRECTION .BACKGROUND ESTIMATED FROM THE EVENTS IN THE WINGS 2058700100038 BEFORE AND AFTER THE FISSION PEAKS. THE U235 DATA 2058700100039 HELPED TO FIX THESE WINGS. 2058700100040 ERR-ANALYS .NO DETAILS GIVEN. 2058700100041 ENDBIB 39 0 2058700100042 COMMON 1 3 2058700100043 EN-DUMMY 2058700100044 EV 2058700100045 2.5300E-02 2058700100046 ENDCOMMON 3 0 2058700100047 ENDSUBENT 46 0 2058700199999 SUBENT 20587002 19840126 00002058700200001 BIB 3 6 2058700200002 REACTION (90-TH-232(N,F),,SIG,,MXW) 2058700200003 THERMAL CROSS SECTION 2058700200004 FLAG (1.) DATA WITHOUT BACKGROUND CORRECTION. 2058700200005 (2.) DATA WITH BACKGROUND CORRECTION. 2058700200006 HISTORY (760811C) 2058700200007 (761217E) 2058700200008 ENDBIB 6 0 2058700200009 NOCOMMON 0 0 2058700200010 DATA 3 2 2058700200011 FLAG DATA-MAX DATA-ERR 2058700200012 NO-DIM MICRO-B MICRO-B 2058700200013 1.0000E+00 7.0000E+00 1.0000E+00 2058700200014 2.0000E+00 4.0000E+00 2058700200015 ENDDATA 4 0 2058700200016 ENDSUBENT 15 0 2058700299999 ENDENTRY 2 0 2058799999999