ENTRY M0429 20160121 M081M042900000001 SUBENT M0429001 20160121 M081M042900100001 BIB 16 53 M042900100002 TITLE The Th-232(gamma,n)Th-231 cross section near M042900100003 threshold. M042900100004 AUTHOR (O.Y.Mafra,M.F.Cezar,C.Renner,J.Goldemberg) M042900100005 REFERENCE (J,NP/A,236,1,1974) M042900100006 (R,IEA-297,1973) - primary reference for 238U(n,2n). M042900100007 INSTITUTE (3BZLIPE,3BZLUSP) M042900100008 FACILITY (REAC,3BZLIPE) M042900100009 INC-SOURCE (MPH=(7-N-14(N,G)7-N-15)). Eg = 10.83 MeV. M042900100010 (MPH=(24-CR-53(N,G)24-CR-54)). Eg = 9.72 MeV. M042900100011 (MPH=(28-NI-58(N,G)28-NI-59)). Eg = 9. MeV. M042900100012 (MPH=(29-CU-63(N,G)29-CU-64)). Eg = 7.91 MeV. M042900100013 (MPH=(30-ZN-64(N,G)30-ZN-65)). Eg = 7.88 MeV. M042900100014 (MPH=(13-AL-27(N,G)13-AL-28)). Eg = 7.73 MeV. M042900100015 (MPH=(26-FE-56(N,G)26-FE-57)). Eg = 7.64 MeV. M042900100016 (MPH=(82-PB-208(N,G)82-PB-209)).Eg = 7.38 MeV. M042900100017 (MPH=(25-MN-55(N,G)25-MN-56)). Eg = 7.23 MeV. M042900100018 (MPH=(4-BE-9(N,G)4-BE-10)). Eg = 6.83 MeV. M042900100019 (MPH=(22-TI-48(N,G)22-TI-49)). Eg = 6.73 MeV. M042900100020 (MPH=(20-CA-40(N,G)20-CA-41)). Eg = 6.42 MeV. M042900100021 (MPH=(39-Y-89(N,G)39-Y-90)). Eg = 6.07 MeV. M042900100022 SAMPLE The thorium was employed in the Th-O2 form. M042900100023 METHOD (ACTIV) M042900100024 DETECTOR (GELI,TRD) M042900100025 PART-DET (DG) M042900100026 ANALYSIS The activity of the Th-231 was measured by 84 keV M042900100027 line after waiting 16.hr in order to allow the Th-233 M042900100028 that can be formed, to decay. M042900100029 ERR-ANALYS (DATA-ERR) The errors include those arising from M042900100030 statistic and calibration. M042900100031 CORRECTION Since the neutron capture targets employed emit M042900100032 also some secondary lines, although with low M042900100033 relative intensity with respect to the principal M042900100034 line, it is necessary to correct their contribution, M042900100035 solving a linear equation system of special type. M042900100036 Using the special equations presented by Caldwell M042900100037 the cross section measured have been recalculating M042900100038 for variation of the average number of neutrons as M042900100039 a function of the excitation energy. M042900100040 REL-REF (M,,J.T.Caldwell+,P,LA-UR-968,1973) Linear equation M042900100041 system. M042900100042 COMMENT The photoneutron cross section of Th-232 was M042900100043 measured by activation methods using monochromatic M042900100044 gamma-rays of energies from 5.43 to 10.83 MeV. The M042900100045 data for photofission of Th-232 together with the M042900100046 data of both types for U-238 are presented. M042900100047 HISTORY (19910218C) M042900100048 (20160121A) Corrected by SD and VV: M042900100049 DECAY-DATA (22.12min,DG,87. -> 25.52hr,DG,26., etc. M042900100050 from Tables 2 of NP/A,236,1,1974), REFEENCE, STATUS, M042900100051 cosmetic corrections in all SUBENTs, DECAY-DATA, M042900100052 lowercase. M042900100053 Subent M0429.004 deleted (data compiled in M0433.003 M042900100054 from author's table). M042900100055 ENDBIB 53 0 M042900100056 NOCOMMON 0 0 M042900100057 ENDSUBENT 56 0 M042900199999 SUBENT M0429002 20160121 M081M042900200001 BIB 4 7 M042900200002 REACTION (90-TH-232(G,N)90-TH-231,,SIG) M042900200003 DECAY-DATA (90-TH-231,25.52HR,DG,26.,0.02,DG,84.,0.10) M042900200004 STATUS (TABLE) Data from Table 4 of NP/A,236,1,1974. M042900200005 (COREL,M0433005) Neutron detectiton data. M042900200006 HISTORY (20160121A) Corrected by SD and VV: STATUS, M042900200007 DECAY-DATA, DATA (Value = 0.0 at En = 6.83 MeV M042900200008 deleted). M042900200009 ENDBIB 7 0 M042900200010 NOCOMMON 0 0 M042900200011 DATA 3 8 M042900200012 EN DATA DATA-ERR M042900200013 MEV MB MB M042900200014 6.42 6.7 2.6 M042900200015 6.73 30.5 4.8 M042900200016 7.23 6.3 3.0 M042900200017 7.38 17.7 2.9 M042900200018 7.64 24.8 6.1 M042900200019 7.73 21.4 4.3 M042900200020 7.88 25.9 4.6 M042900200021 9. 73.8 17.4 M042900200022 ENDDATA 10 0 M042900200023 ENDSUBENT 22 0 M042900299999 SUBENT M0429003 20160121 M081M042900300001 BIB 3 4 M042900300002 REACTION (92-U-238(G,N)92-U-237,,SIG) M042900300003 STATUS (TABLE) Data from Table 4 of NP/A,236,1,1974. M042900300004 (COREL,M0433004) Neutron detectiton data. M042900300005 HISTORY (20160121A) Corrected by SD and VV: STATUS. M042900300006 ENDBIB 4 0 M042900300007 NOCOMMON 0 0 M042900300008 DATA 3 10 M042900300009 EN DATA DATA-ERR M042900300010 MEV MB MB M042900300011 6.07 10.6 3.2 M042900300012 6.42 2.4 1.2 M042900300013 6.73 23.2 6.4 M042900300014 6.83 3.8 1.2 M042900300015 7.23 6.3 3.9 M042900300016 7.38 21.9 5.4 M042900300017 7.64 21.9 6.9 M042900300018 7.73 18.8 4.1 M042900300019 7.88 25.4 6.4 M042900300020 9.00 85.1 23.2 M042900300021 ENDDATA 12 0 M042900300022 ENDSUBENT 21 0 M042900399999 NOSUBENT M0429004 20160121 M081M042900400001 ENDENTRY 4 0 M042999999999