ENTRY M0574 20190625 M101M057400000001 SUBENT M0574001 20190625 M101M057400100001 BIB 11 43 M057400100002 TITLE Cross section of ternary fission of Al, Ti, Co, and M057400100003 Zr nuclei induced by (0.8 - 1.8) GeV photons. M057400100004 AUTHOR (D.A.De Lima,E.V.De Sousa,W.C.C.Milomem, M057400100005 O.A.P.Tavares) M057400100006 REFERENCE (J,NC/A,101,975,1989) M057400100007 INSTITUTE (3BZLRIO) M057400100008 (3BZLBZL) Departamento de Fisica, Universidade Federal M057400100009 da Paraiba 5800 Joao Pessoa-PB, Brasil. M057400100010 FACILITY (SYNCH,2GERBON) The Bonn 2.5 GeV electron synchrotron. M057400100011 INC-SOURCE (BRST) M057400100012 METHOD (EXTB,STTA) M057400100013 ANALYSIS Optical microscopy track number counting after the M057400100014 track etching procedures in order to make fission M057400100015 tracks visible for track analysis under optical M057400100016 microscopy. M057400100017 The Cr-39 plates were submitted to a 6.25 n NaOH M057400100018 etching at 60 C degree during two or three periods M057400100019 of 1 hr each. M057400100020 In the case of makrofol sheets a 6.25 n NaOH etching M057400100021 solution was used, this time at 70 C degree during M057400100022 three periods of 20 min each. M057400100023 ERR-ANALYS (ERR-S) Statistical errors. M057400100024 COMMENT A research on ternary fission of Al, Ti, Co, and Zr M057400100025 nuclei induced by bremsstrahlung photons of 0.8, 1.0, M057400100026 1.4, and 1.8 GeV end-point energies has been carried M057400100027 out using makrofol polycarbonate and Cr-39 polymer as M057400100028 fission-track detectors. Thick target metal foils M057400100029 were used in contact with the plastic detectors. From M057400100030 the observation and analysis of double divergent, M057400100031 etched fission tracks from a common point inside the M057400100032 target the number of events of ternary fission has M057400100033 been evaluated. Absolute mean cross sections per M057400100034 photon of ternary fission in the range (0.8 - 1.8) M057400100035 GeV have been obtained as 0.3+-0.7, 1.7+-1.5, M057400100036 0.5+-0.5, and 1+-1 microbarn, respectively, for Al, M057400100037 Ti, Co, and Zr nuclei. A probability of ternary M057400100038 fission of about 10**4 has been deduced. Results are M057400100039 discussed and compared with other ternary fission M057400100040 data. M057400100041 HISTORY (19990316C) Data were compiled at the USA BNL NNDC by M057400100042 V.V.Varlamov. M057400100043 (20190625U) Corrected by SD and VV: ERR-ANALYS, M057400100044 REACTION, STATUS, DATA. M057400100045 ENDBIB 43 0 M057400100046 NOCOMMON 0 0 M057400100047 ENDSUBENT 46 0 M057400199999 SUBENT M0574002 20190625 M101M057400200001 BIB 5 9 M057400200002 REACTION (13-AL-27(G,F),TER,SIG,,BRA) M057400200003 SAMPLE Target elements ((1.6 - 3.0) x 10**18/cm**2 target M057400200004 nuclei) were placed in contact with plates of about M057400200005 1 mm thick Cr-39 polymer track detectors. M057400200006 DETECTOR (TRD,PLATE) About 1 mm thick Cr-39 polymer track M057400200007 detectors. M057400200008 STATUS (TABLE) Table 1 from Nuovo Cim.,A101(1989)975. M057400200009 HISTORY (20190625U) Corrected by SD and VV: REACTION (BRS -> M057400200010 BRA), STATUS, DATA-ERR -> ERR-S. M057400200011 ENDBIB 9 0 M057400200012 NOCOMMON 0 0 M057400200013 DATA 3 4 M057400200014 EN-MAX DATA ERR-S M057400200015 GEV MICRO-B MICRO-B M057400200016 .8 .7 .4 M057400200017 1.0 .4 .2 M057400200018 1.4 .4 .2 M057400200019 1.8 .6 .3 M057400200020 ENDDATA 6 0 M057400200021 ENDSUBENT 20 0 M057400299999 SUBENT M0574003 20190625 M101M057400300001 BIB 5 9 M057400300002 REACTION (22-TI-0(G,F),TER,SIG,,BRA) M057400300003 SAMPLE Target elements (2.1 x 10**18/cm**2 target nuclei) M057400300004 were placed in contact with plates of about 1 mm M057400300005 thick Cr-39 polymer track detectors. M057400300006 DETECTOR (TRD,PLATE) About 1 mm thick Cr-39 polymer track M057400300007 detectors. M057400300008 STATUS (TABLE) Table 1 from Nuovo Cim.,A101(1989)975. M057400300009 HISTORY (20190625U) Corrected by SD and VV: REACTION (BRS -> M057400300010 BRA), STATUS, DATA-ERR -> ERR-S. M057400300011 ENDBIB 9 0 M057400300012 NOCOMMON 0 0 M057400300013 DATA 4 4 M057400300014 EN-MAX DATA DATA-MAX ERR-S M057400300015 GEV MICRO-B MICRO-B MICRO-B M057400300016 .8 .8 .5 M057400300017 1.0 1.7 .6 M057400300018 1.4 1.8 .8 M057400300019 1.8 1.2E-1 .2 M057400300020 ENDDATA 6 0 M057400300021 ENDSUBENT 20 0 M057400399999 SUBENT M0574004 20190625 M101M057400400001 BIB 5 9 M057400400002 REACTION (27-CO-59(G,F),,SIG,,BRA) M057400400003 SAMPLE Stacking thick metal foils of Co target elements M057400400004 (0.23 x 10**18/cm**2 target nuclei) each facing M057400400005 makrofol detectors. M057400400006 DETECTOR (TRD,PLATE) 100 micron thick macrofol polycarbonate M057400400007 track detectors. M057400400008 STATUS (TABLE) Table 1 from Nuovo Cim.,A101(1989)975. M057400400009 HISTORY (20190625U) Corrected by SD and VV: REACTION (BRS -> M057400400010 BRA), STATUS, DATA-ERR -> ERR-S. M057400400011 ENDBIB 9 0 M057400400012 NOCOMMON 0 0 M057400400013 DATA 3 4 M057400400014 EN-MAX DATA ERR-S M057400400015 GEV MICRO-B MICRO-B M057400400016 .8 1.1 .3 M057400400017 1.0 1.3 .3 M057400400018 1.4 2.8 .6 M057400400019 1.8 1.5 .4 M057400400020 ENDDATA 6 0 M057400400021 ENDSUBENT 20 0 M057400499999 SUBENT M0574005 20190625 M101M057400500001 BIB 5 9 M057400500002 REACTION (40-ZR-0(G,F),,SIG,,BRA) M057400500003 SAMPLE Stacking thick metal foils of Zr target elements M057400500004 (0.13 x 10**18/cm**2 target nuclei) each facing M057400500005 makrofol detectors. M057400500006 DETECTOR (TRD,PLATE) 100 micron thick macrofol polycarbonate M057400500007 track detectors. M057400500008 STATUS (TABLE) Table 1 from Nuovo Cim.,A101(1989)975. M057400500009 HISTORY (20190625U) Corrected by SD and VV: REACTION (BRS -> M057400500010 BRA), STATUS, DATA-ERR -> ERR-S. M057400500011 ENDBIB 9 0 M057400500012 NOCOMMON 0 0 M057400500013 DATA 3 4 M057400500014 EN-MAX DATA ERR-S M057400500015 GEV MICRO-B MICRO-B M057400500016 .8 2.1 .6 M057400500017 1.0 2.2 .6 M057400500018 1.4 2.7 .6 M057400500019 1.8 .8 .4 M057400500020 ENDDATA 6 0 M057400500021 ENDSUBENT 20 0 M057400599999 ENDENTRY 5 0 M057499999999