ENTRY 20066 20190909 22822006600000001 SUBENT 20066001 20190909 22822006600100001 BIB 17 43 2006600100002 TITLE Inelastic neutron scattering and fission of Th-232 2006600100003 near the fission threshold 2006600100004 AUTHOR (M.Holmberg,L.G.Stromberg,L.Wallin) 2006600100005 REFERENCE (J,NP/A,127,149,1969) 2006600100006 INSTITUTE (2SWDFOA) 2006600100007 FACILITY (VDG,2SWDFOA) 2.5 MeV Van de Graaff accel. at Stockholm2006600100008 (VDG,2SWDAE ) 5.5 MeV Van de Graaff accel. at Studsvik 2006600100009 INC-SOURCE (P-T) Proton-tritium 2006600100010 SAMPLE Spheres with 20 mm diam. Thin adsorbed targets on gold 2006600100011 backings were used. The target thickness was about 2006600100012 15 keV for the actual proton energies. 2006600100013 METHOD (TOF) Time-of-flight 2006600100014 All measurements were performed at a fixed angle 2006600100015 of 100 deg.; Distance target - sample 10 cm; 2006600100016 flight path 180 cm 2006600100017 DETECTOR (SCIN) Plastic scintillation detector 2006600100018 (LONGC) long counter as monitor of the neutron flux 2006600100019 ANALYSIS (4PI1A) 4Pi times measured excitation cross section 2006600100020 at 100 deg. 2006600100021 MONITOR (6-C-0(N,EL)6-C-0,,DA) 2006600100022 MONIT-REF (,M.D.Goldberg+,R,BNL-400,1962) Report BNL 2006600100023 400 (1962) 2nd ed., vol.1 2006600100024 COMMENT The experimental results show that the structure in 2006600100025 the fission cross section of Th-232 near the fission 2006600100026 threshold cannot be adequately interpreted in terms of2006600100027 competition between fission and neutron emission. 2006600100028 CORRECTION Background subtraction, correction for the difference2006600100029 in detector efficiencies for the inelastic neutron 2006600100030 group and for the neutrons elastically scattered 2006600100031 against carbon 2006600100032 Correction for multiple scattering in the sample using2006600100033 a Monte Carlo technique (11+-2%) 2006600100034 ERR-ANALYS The errors in the measured cross-sections 2006600100035 are partly statistical, but the largest contribution 2006600100036 is due to the uncertainty caused by the background 2006600100037 subtraction 2006600100038 (DATA-ERR) The errors are estimated from the 2006600100039 uncertainty in the background subtraction procedure. 2006600100040 STATUS (TABLE) Tbl. 1 from Nucl.Phys.,A127(1969)149 2006600100041 HISTORY (19710514T) From NEUDADA file 2006600100042 (20190909A) SD:Updated to new date formats,lower case. 2006600100043 BIB updated. Data presentation updated according 2006600100044 to the table. Subents 002,003 were merged. 2006600100045 ENDBIB 43 0 2006600100046 COMMON 1 3 2006600100047 ANG 2006600100048 ADEG 2006600100049 100. 2006600100050 ENDCOMMON 3 0 2006600100051 ENDSUBENT 50 0 2006600199999 SUBENT 20066002 20190909 22822006600200001 BIB 3 6 2006600200002 REACTION (90-TH-232(N,INL)90-TH-232,PAR,DA,,4PI) 2006600200003 EN-SEC The levels given are in fact unresolved level-groups 2006600200004 around these energies. 2006600200005 HISTORY (19710514T) From NEUDADA file 2006600200006 (20190909A) SD: SF6=SIG -> DA, SF8=4PI in REACTION code2006600200007 PART-DET deleted. Data from Subent 003. 2006600200008 ENDBIB 6 0 2006600200009 NOCOMMON 0 0 2006600200010 DATA 4 30 2006600200011 E-LVL EN DATA DATA-ERR 2006600200012 MEV MEV B B 2006600200013 0.8 1.05 0.51 0.07 2006600200014 0.8 1.12 0.60 0.07 2006600200015 0.8 1.18 0.86 0.09 2006600200016 0.8 1.26 0.99 0.10 2006600200017 0.8 1.35 0.81 0.08 2006600200018 0.8 1.42 0.83 0.08 2006600200019 0.8 1.52 0.80 0.08 2006600200020 0.8 1.60 0.84 0.08 2006600200021 0.8 1.65 0.76 0.08 2006600200022 0.8 1.75 0.70 0.07 2006600200023 0.8 1.80 0.65 0.07 2006600200024 0.8 1.85 0.64 0.07 2006600200025 0.8 1.90 0.65 0.10 2006600200026 0.8 2.00 0.56 0.08 2006600200027 0.8 2.04 0.56 0.08 2006600200028 0.8 2.10 0.51 0.08 2006600200029 0.8 2.20 0.46 0.08 2006600200030 1.1 1.35 0.08 0.04 2006600200031 1.1 1.42 0.35 0.07 2006600200032 1.1 1.52 0.60 0.07 2006600200033 1.1 1.60 0.79 0.08 2006600200034 1.1 1.65 0.76 0.08 2006600200035 1.1 1.75 0.76 0.08 2006600200036 1.1 1.80 0.76 0.08 2006600200037 1.1 1.85 0.74 0.08 2006600200038 1.1 1.90 0.80 0.10 2006600200039 1.1 2.00 0.67 0.08 2006600200040 1.1 2.04 0.70 0.08 2006600200041 1.1 2.10 0.53 0.07 2006600200042 1.1 2.20 0.65 0.08 2006600200043 ENDDATA 32 0 2006600200044 ENDSUBENT 43 0 2006600299999 NOSUBENT 20066003 20190909 22822006600300001 SUBENT 20066004 20190909 22822006600400001 BIB 3 6 2006600400002 REACTION (90-TH-232(N,INL)90-TH-232,PAR,DA,,4PI) 2006600400003 EN-SEC The levels given are in fact unresolved level-groups 2006600400004 around these energies. 2006600400005 HISTORY (19710514T) From NEUDADA file 2006600400006 (20190909A) SD: SF6=SIG -> DA, SF8=4PI in REACTION code2006600400007 PART-DET deleted. 2006600400008 ENDBIB 6 0 2006600400009 COMMON 2 3 2006600400010 E-LVL-MAX E-LVL-MIN 2006600400011 MEV MEV 2006600400012 1.6 1.45 2006600400013 ENDCOMMON 3 0 2006600400014 DATA 3 6 2006600400015 EN DATA DATA-ERR 2006600400016 MEV B B 2006600400017 1.85 0.23 0.04 2006600400018 1.90 0.35 0.05 2006600400019 2.00 0.55 0.06 2006600400020 2.04 0.70 0.07 2006600400021 2.10 0.68 0.07 2006600400022 2.20 1.01 0.10 2006600400023 ENDDATA 8 0 2006600400024 ENDSUBENT 23 0 2006600499999 ENDENTRY 4 0 2006699999999