ENTRY M0534 20160202 M081M053400000001 SUBENT M0534001 20160202 M081M053400100001 BIB 13 29 M053400100002 TITLE Subthreshold photofission of U-235 and Th-232. M053400100003 AUTHOR (C.D.Bowman,I.G.Schroder,K.C.Duvall,C.E.Dick) M053400100004 INSTITUTE (1USANBS) M053400100005 REFERENCE (J,PR/C,17,1086,1978) M053400100006 INC-SOURCE (BRST) M053400100007 FACILITY (LINAC,1USAANL) M053400100008 (VDG,1USANBS) M053400100009 SAMPLE Natural Th and enriched U-235 targets. M053400100010 METHOD (EXTB,SITA) M053400100011 DETECTOR (TRD) Mica foils. M053400100012 ANALYSIS (UNFLD) The unfolding of the reaction cross section M053400100013 using the photon difference method from the M053400100014 experimental reaction yield measured using the the M053400100015 direct fission fragment counting. M053400100016 ERR-ANALYS (DATA-ERR) Mean-root-squared uncertainties. M053400100017 The systematic uncertainties are estimated to be M053400100018 perhaps as large as a factor of 2. M053400100019 COMMENT Photofission cross sections for Th-232 and U-235 have M053400100020 been measured in the energy range from 3.25 to 5.75 M053400100021 MeV and for U-234 and U-236 at 3.5 MeV. The cross M053400100022 sections change by over seven orders of magnitude M053400100023 for this energy range. Cross section shapes are M053400100024 significantly different for different isotopes M053400100025 indicating a strong sensitivity to fission barrier M053400100026 parameters. M053400100027 HISTORY (19980724C) Data were compiled at the Russia MSU SINP M053400100028 CDFE by V.Varlamov. M053400100029 (20160202A) Corrected by V.Varlamov: ERR-ANALYS, M053400100030 REACTION, DATA, lowercase. M053400100031 ENDBIB 29 0 M053400100032 NOCOMMON 0 0 M053400100033 ENDSUBENT 32 0 M053400199999 SUBENT M0534002 20160202 M081M053400200001 BIB 3 4 M053400200002 REACTION (90-TH-232(G,F),,SIG,,BRS) M053400200003 STATUS (TABLE) Data from Tab. III of PR/C,17,1086,1978. M053400200004 HISTORY (20160202A) Corrected by V.Varlamov: REACTION, M053400200005 STATUS, DATA substituted. M053400200006 ENDBIB 4 0 M053400200007 NOCOMMON 0 0 M053400200008 DATA 3 6 M053400200009 EN DATA DATA-ERR M053400200010 MEV MICRO-B MICRO-B M053400200011 3.25 7.40E-07 1.29E-05 M053400200012 3.75 3.3E-04 2.2E-04 M053400200013 4.25 4.40E-04 1.07E-03 M053400200014 4.75 1.6E-02 1.4E-02 M053400200015 5.25 4.2E-01 1.1E-01 M053400200016 5.75 8.6E+02 2.5E+01 M053400200017 ENDDATA 8 0 M053400200018 ENDSUBENT 17 0 M053400299999 SUBENT M0534003 20160202 M081M053400300001 BIB 3 4 M053400300002 REACTION (92-U-235(G,F),,SIG,,BRS) M053400300003 STATUS (TABLE) Data from Tab. III. of PR/C,17,1086,1978. M053400300004 HISTORY (20160202A) Corrected by V.Varlamov: REACTION, M053400300005 STATUS, DATA substituted. M053400300006 ENDBIB 4 0 M053400300007 NOCOMMON 0 0 M053400300008 DATA 3 6 M053400300009 EN DATA DATA-ERR M053400300010 MEV MICRO-B MICRO-B M053400300011 3.25 6.8E-05 2.6E-05 M053400300012 3.75 1.7E-03 4.7E-04 M053400300013 4.25 4.90E-05 2.48E-03 M053400300014 4.75 6.3E-02 1.9E-02 M053400300015 5.25 1.1E+01 8.0E-01 M053400300016 5.75 5.6E+02 1.1E+01 M053400300017 ENDDATA 8 0 M053400300018 ENDSUBENT 17 0 M053400399999 SUBENT M0534004 20160202 M081M053400400001 BIB 3 4 M053400400002 REACTION (92-U-234(G,F),,SIG,,BRS) M053400400003 STATUS (TABLE) Data from the text. M053400400004 HISTORY (20160202A) Corrected by V.Varlamov: REACTION, M053400400005 STATUS. M053400400006 ENDBIB 4 0 M053400400007 NOCOMMON 0 0 M053400400008 DATA 3 1 M053400400009 EN DATA DATA-ERR M053400400010 MEV MICRO-B MICRO-B M053400400011 3.5 0.3E-04 2.5E-04 M053400400012 ENDDATA 3 0 M053400400013 ENDSUBENT 12 0 M053400499999 SUBENT M0534005 20160202 M081M053400500001 BIB 3 4 M053400500002 REACTION (92-U-236(G,F),,SIG,,BRS) M053400500003 STATUS (TABLE) Data from the text. M053400500004 HISTORY (20160202A) Corrected by V.Varlamov: REACTION, M053400500005 STATUS. M053400500006 ENDBIB 4 0 M053400500007 NOCOMMON 0 0 M053400500008 DATA 3 1 M053400500009 EN DATA DATA-ERR M053400500010 MEV MICRO-B MICRO-B M053400500011 3.5 1.2E-04 1.7E-04 M053400500012 ENDDATA 3 0 M053400500013 ENDSUBENT 12 0 M053400599999 ENDENTRY 5 0 M053499999999