ENTRY 20351 20071121 21902035100000001 SUBENT 20351001 20071121 21902035100100001 BIB 13 21 2035100100002 INSTITUTE (2BLGMOL) 2035100100003 REFERENCE (J,JIN,35,4323,197312) 2035100100004 (P,EANDC(E)-157,(2),94,197305) Progress report. 2035100100005 AUTHOR (P.Del Marmol, F.Hanappe, M.Monsecour) 2035100100006 TITLE -On the thermal neutron fission cross-section of 2035100100007 Ac-227 and Th-227.- 2035100100008 FACILITY (REAC) BR1 reactor 2035100100009 INC-SOURCE (THCOL) 2035100100010 INC-SPECT .Thermal neutron flux of 4.8*E+9 N/cm2/sec with a 2035100100011 cadmium ratio for gold of 1.E+5. 2035100100012 DETECTOR (SCIN) .Gold neutron flux monitor. 2035100100013 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) 2035100100014 PART-DET (FF) Fission fragments. 2035100100015 MISC-COL (MISC) Cadmium ratio for gold 2035100100016 STATUS .Data from J.Inorg.Nucl.Chem.,35(1973)4323. 2035100100017 HISTORY (19740307C) 2035100100018 (19740929E) 2035100100019 (20071121A) Date and data in SAN 002 are corrected 2035100100020 after comments of N.Ohtsuka 2035100100021 History repetition in SAN 002, 003 erased 2035100100022 (20071121U) Last corrections have been done. 2035100100023 ENDBIB 21 0 2035100100024 COMMON 2 3 2035100100025 EN-DUMMY MISC 2035100100026 MEV NO-DIM 2035100100027 2.53E-08 1.E+05 2035100100028 ENDCOMMON 3 0 2035100100029 ENDSUBENT 28 0 2035100199999 SUBENT 20351002 20071121 21902035100200001 BIB 5 16 2035100200002 REACTION (89-AC-227(N,F),,SIG,,MXW,DERIV) 2035100200003 SAMPLE .Ac-227 was produced by irradiation of Ra-226 in the 2035100200004 Br-2 reactor and purified to better than 99.95 percent2035100200005 to eliminate its descendant, mostly Th-227, further 2035100200006 purification was carried out a few hours before 2035100200007 measurement. 2035100200008 ANALYSIS .Experimental error is larger than value itself, 2035100200009 only upper limit of value is given. 2035100200010 .Two results were obtained, they are 2035100200011 125 +- 164 micro-B and 335 +- 68 micro-B. 2035100200012 50 micro-barn should be subtracted as a slight 2035100200013 contribution from Th-227. 2035100200014 STATUS (DEP,20351006) 2035100200015 (DEP,20351007) 2035100200016 HISTORY (20071121A) Data value increased in 1000 times 2035100200017 (20071121U) Last corrections have been done. 2035100200018 ENDBIB 16 0 2035100200019 NOCOMMON 0 0 2035100200020 DATA 1 1 2035100200021 DATA-MAX 2035100200022 MICRO-B 2035100200023 350. 2035100200024 ENDDATA 3 0 2035100200025 ENDSUBENT 24 0 2035100299999 SUBENT 20351003 20071121 21902035100300001 BIB 4 10 2035100300002 REACTION (90-TH-227(N,F),,SIG,,MXW,DERIV) 2035100300003 SAMPLE .Chemically separated Th-227 sample. 2035100300004 ANALYSIS .From two values of the cross-sections, additional 5 2035100300005 perc. Deviation assumed for systematic errors in both 2035100300006 flux and weight measurements, and 5 perc. Deviation 2035100300007 for detector efficiency. 2035100300008 .Two results were obtained, they are 2035100300009 215 +- 9.7 B and 200.2 +- 4.5 B. 2035100300010 STATUS (DEP,20351004) 2035100300011 (DEP,20351005) 2035100300012 ENDBIB 10 0 2035100300013 NOCOMMON 0 0 2035100300014 DATA 2 1 2035100300015 DATA DATA-ERR 2035100300016 B B 2035100300017 2.03E+02 1.6E+01 2035100300018 ENDDATA 3 0 2035100300019 ENDSUBENT 18 0 2035100399999 SUBENT 20351004 20071121 21902035100400001 BIB 4 4 2035100400002 REACTION (90-TH-227(N,F),,SIG,,MXW) 2035100400003 SAMPLE .Chemically separated Th-227 sample. 2035100400004 METHOD .Method of fission-track counting. 2035100400005 HISTORY (20071121C) SM 2035100400006 ENDBIB 4 0 2035100400007 NOCOMMON 0 0 2035100400008 DATA 2 1 2035100400009 DATA DATA-ERR 2035100400010 B B 2035100400011 2.156E+02 9.7E+00 2035100400012 ENDDATA 3 0 2035100400013 ENDSUBENT 12 0 2035100499999 SUBENT 20351005 20071121 21902035100500001 BIB 5 6 2035100500002 REACTION (90-TH-227(N,F),,SIG,,MXW) 2035100500003 SAMPLE .Chemically separated Th-227 sample. 2035100500004 DETECTOR (TRD) Makrofol-E polycarbonate track detector, 2035100500005 10 mm diameter 2035100500006 ANALYSIS .Direct counting of tracks 2035100500007 HISTORY (20071121C) SM 2035100500008 ENDBIB 6 0 2035100500009 NOCOMMON 0 0 2035100500010 DATA 2 1 2035100500011 DATA DATA-ERR 2035100500012 B B 2035100500013 2.002E+02 4.5E+00 2035100500014 ENDDATA 3 0 2035100500015 ENDSUBENT 14 0 2035100599999 SUBENT 20351006 20071121 21902035100600001 BIB 7 11 2035100600002 REACTION (89-AC-227(N,F),,SIG,,MXW,DERIV) 2035100600003 METHOD .Method of fission-track counting. 2035100600004 SAMPLE .Ac-227 was produced by irradiation of Ra-226 in the 2035100600005 Br-2 reactor and purified to better than 99.95 percent2035100600006 to eliminate its descendant, mostly Th-227, further 2035100600007 purification was carried out a few hours before 2035100600008 measurement. 2035100600009 ANALYSIS .Derived from Th-227(N,G) cross section 2035100600010 ASSUMED (ASSUM,90-TH-227(N,G)90-TH-228,,SIG,,MXW) 2035100600011 STATUS (DEP,20351004) 2035100600012 HISTORY (20071121C) SM 2035100600013 ENDBIB 11 0 2035100600014 NOCOMMON 0 0 2035100600015 DATA 4 1 2035100600016 DATA DATA-ERR ASSUM ASSUM-ERR 2035100600017 MICRO-B MICRO-B B B 2035100600018 125. 164. 2.156 E+02 9.7 2035100600019 ENDDATA 3 0 2035100600020 ENDSUBENT 19 0 2035100699999 SUBENT 20351007 20071121 21902035100700001 BIB 7 13 2035100700002 REACTION (89-AC-227(N,F),,SIG,,MXW,DERIV) 2035100700003 DETECTOR (TRD) Makrofol-E polycarbonate track detector, 2035100700004 10 mm diameter 2035100700005 SAMPLE .Ac-227 was produced by irradiation of Ra-226 in the 2035100700006 Br-2 reactor and purified to better than 99.95 percent2035100700007 to eliminate its descendant, mostly Th-227, further 2035100700008 purification was carried out a few hours before 2035100700009 measurement. 2035100700010 ANALYSIS .Derived from Th-227(N,G) cross section 2035100700011 ASSUMED (ASSUM,90-TH-227(N,G)90-TH-228,,SIG,,MXW) 2035100700012 50 micro-barn should be subtracted as a slight 2035100700013 STATUS (DEP,20351005) 2035100700014 HISTORY (20071121C) SM 2035100700015 ENDBIB 13 0 2035100700016 NOCOMMON 0 0 2035100700017 DATA 4 1 2035100700018 DATA DATA-ERR ASSUM ASSUM-ERR 2035100700019 MICRO-B MICRO-B B B 2035100700020 335. 68. 2.002E+02 4.5 2035100700021 ENDDATA 3 0 2035100700022 ENDSUBENT 21 0 2035100799999 ENDENTRY 7 0 2035199999999