ENTRY M0449 20160412 M083M044900000001 SUBENT M0449001 20160412 M083M044900100001 BIB 15 40 M044900100002 TITLE Photofission cross section of Th-232. M044900100003 AUTHOR (H.X.Zhang,T.R.Yeh,H.Lancman) M044900100004 REFERENCE (J,PR/C,34,1397,1986) M044900100005 INSTITUTE (1USABLN) M044900100006 FACILITY (DYNAM,1USABLN) M044900100007 INC-SOURCE (MPH=(73-TA-181(P,G)74-W-182)) The energy of the M044900100008 emitted g-ray is fully Doppler-shifted. It varies M044900100009 with the angle of emission relative to the proton M044900100010 beam. M044900100011 METHOD (EXTB) M044900100012 SAMPLE Foils of thorium, 30 mg/cm**2 thick, containing 99.9% M044900100013 of Th-232. M044900100014 PART-DET (FF) M044900100015 DETECTOR (PLATE) Two 8 micron thick strips of polycarbonate M044900100016 films (KIMFOL) with thorium sample between them. M044900100017 ANALYSIS The photofission cross section sig(g,f) at photon M044900100018 energy Eg is related to the fission fragments counts M044900100019 in a strip. M044900100020 ERR-ANALYS (DATA-ERR) The errors are given include counting M044900100021 errors, errors in efficiency calibration of the M044900100022 g-ray and fission fragment detectors, uncertainties M044900100023 in the angular distribution of the fission fragments M044900100024 and g-rays, and uncertainties in the alignment of M044900100025 the thorium foils and kimfol films relative to the M044900100026 proton target. M044900100027 CORRECTION The cross sections given were corrected for M044900100028 contributions caused by the unwanted gamma-rays M044900100029 emitted from some (p,g) resonances. Except for one M044900100030 case, these corrections did not exceed 10% of the M044900100031 presented values. The sum of the corrections from M044900100032 fission caused by neutrons from (g,n), (g,2n), and M044900100033 fission, as well as contribution from (g,nf), were M044900100034 estimated to be smoller than 2%. M044900100035 COMMENT The photofission cross section of Th-232 was measured M044900100036 in the 5.8 - 12.0 MeV energy range with an average M044900100037 photon energy resolution of 600 eV. Intermediate M044900100038 structure was observed at 5.91, 5.97, and 6.31 MeV. M044900100039 HISTORY (19910218C) M044900100040 (20160412A) Corrected by V.Varlamov: dates, STATUS, M044900100041 ERR-ANALYS, lowercase. M044900100042 ENDBIB 40 0 M044900100043 NOCOMMON 0 0 M044900100044 ENDSUBENT 43 0 M044900199999 SUBENT M0449002 20160412 M083M044900200001 BIB 3 3 M044900200002 REACTION (90-TH-232(G,F),,SIG) M044900200003 STATUS (CURVE) Data from Fig. 1. M044900200004 HISTORY (20160412A) Corrected by V.Varlamov: STATUS, M044900200005 ENDBIB 3 0 M044900200006 NOCOMMON 0 0 M044900200007 DATA 3 21 M044900200008 EN DATA DATA-ERR M044900200009 MEV MB MB M044900200010 5.8 4. 1. M044900200011 5.9 8.0 1.5 M044900200012 5.95 6. 1. M044900200013 6.1 7.5 1.0 M044900200014 6.2 15.5 2.0 M044900200015 6.25 7. 1. M044900200016 6.3 15.05 2.00 M044900200017 6.6 13. 1. M044900200018 6.8 8. 1. M044900200019 7.4 5. 1. M044900200020 7.9 6. 1. M044900200021 8.25 6.5 1.5 M044900200022 8.75 7.0 1.5 M044900200023 8.95 8.5 1.5 M044900200024 9.4 19.5 2.5 M044900200025 10. 22. 2. M044900200026 10.75 28. 2. M044900200027 11. 32. 2. M044900200028 11.05 31.5 2.0 M044900200029 11.5 33.5 3.5 M044900200030 11.9 29.0 3.5 M044900200031 ENDDATA 23 0 M044900200032 ENDSUBENT 31 0 M044900299999 SUBENT M0449003 20160412 M083M044900300001 BIB 3 6 M044900300002 REACTION ((90-TH-232(G,F),,SIG)/(90-TH-232(G,ABS),,SIG)) M044900300003 Data on fission probability. M044900300004 REL-REF (R,,J.T.Caldwell+,J,PR/C,21,1215,1980) M044900300005 Data on (g,abs) reaction cross section. M044900300006 STATUS (CURVE) Data from Fig. 4. M044900300007 (DEP,M0449002) M044900300008 ENDBIB 6 0 M044900300009 NOCOMMON 0 0 M044900300010 DATA 3 21 M044900300011 EN DATA DATA-ERR M044900300012 MEV NO-DIM NO-DIM M044900300013 5.8 .18 .01 M044900300014 5.9 .33 .05 M044900300015 5.95 .24 .03 M044900300016 6.1 .29 .04 M044900300017 6.2 .54 .06 M044900300018 6.25 .24 .06 M044900300019 6.3 .55 .05 M044900300020 6.6 .34 .06 M044900300021 6.8 .21 .04 M044900300022 7.4 .074 .005 M044900300023 7.9 .075 .006 M044900300024 8.25 .063 .007 M044900300025 8.75 .058 .007 M044900300026 8.95 .070 .005 M044900300027 9.4 .120 .012 M044900300028 10. .080 .005 M044900300029 10.75 .070 .006 M044900300030 11. .062 .007 M044900300031 11.05 .061 .008 M044900300032 11.5 .072 .008 M044900300033 11.9 .062 .008 M044900300034 ENDDATA 23 0 M044900300035 ENDSUBENT 34 0 M044900399999 ENDENTRY 3 0 M044999999999