ENTRY 41536 20100301 41494153600000001 SUBENT 41536001 20100301 41494153600100001 BIB 9 29 4153600100002 TITLE Investigation of quaternary fission of Cm-248 and 4153600100003 Cf-252 using two CsI(Tl) counters. 4153600100004 REFERENCE (J,NIM/A,384,519,1997) 4153600100005 #doi:10.1016/S0168-9002(96)00869-8 4153600100006 AUTHOR (A.S.Fomichev,I.David,M.P.Ivanov,Yu.G.Sobolev) 4153600100007 INSTITUTE (4ZZZDUB) 4153600100008 REL-REF (M,41535001,A.S.Fomichev+,J,NIM/A,368,852,1996) 4153600100009 Exp. method details. 4153600100010 SAMPLE 252-Cf of 6 mm diameter had 50 microg/cm**2 Al2-O3 4153600100011 support. 4153600100012 Cm-248 of 10 mm diameter had Ti support of 1.5 microm 4153600100013 thickness. 4153600100014 DETECTOR (CSICR) Two identical detectors on the basis of CsI(Tl)4153600100015 of 20 mm diameter, 0.5 mm long (Harshaw Chemical Comp.)4153600100016 and FEU-176 (Novosibirsk,Russia) with photocathode 4153600100017 diameter 44 mm and spectral range of 300-850 nm. 4153600100018 Positioned at distance of 4 mm on both sides of sample.4153600100019 Total geometry efficiency of set-up - about 60 %. 4153600100020 Both crystals had 2.5 microm Al mylar reflector on the 4153600100021 front polish surface. 4153600100022 27 microm thickness Al foils were installed in front of4153600100023 the scintillation counters to absorb the natural 4153600100024 alpha-activity and fission fragments. 4153600100025 Energy resolution of each detector (E-alpha=8.78 MeV) 4153600100026 at T1 gate was 2.8 %. 4153600100027 METHOD (PSD) Pulse shape analysis method . 4153600100028 (COINC) Simultaneous detection of two LCP had gate 4153600100029 duration of 2 microsec. 4153600100030 HISTORY (20100101C) MM. Compiled at CJD. 4153600100031 ENDBIB 29 0 4153600100032 NOCOMMON 0 0 4153600100033 ENDSUBENT 32 0 4153600199999 SUBENT 41536002 20100301 41494153600200001 BIB 3 5 4153600200002 REACTION (98-CF-252(0,F)ELEM/MASS,QTR,FY,,REL) 4153600200003 Yield of pair ELEM1/MASS1 - ELEM2/MASS2 in quaternary4153600200004 fission, counts. 4153600200005 CORRECTION Results without random coincidence correction. 4153600200006 STATUS (TABLE) Table 1 of J,NIM/A,384,519,1997. 4153600200007 ENDBIB 5 0 4153600200008 NOCOMMON 0 0 4153600200009 DATA 5 3 4153600200010 ELEM1 MASS1 ELEM2 MASS2 DATA 4153600200011 NO-DIM NO-DIM NO-DIM NO-DIM ARB-UNITS 4153600200012 2. 4. 2. 4. 57. 4153600200013 2. 4. 1. 3. 9. 4153600200014 2. 4. 1. 1. 4. 4153600200015 ENDDATA 5 0 4153600200016 ENDSUBENT 15 0 4153600299999 SUBENT 41536003 20100301 41494153600300001 BIB 3 5 4153600300002 REACTION (96-CM-248(0,F)ELEM/MASS,QTR,FY,,REL) 4153600300003 Yield of pair ELEM1/MASS1 - ELEM2/MASS2 in quaternary4153600300004 fission, counts. 4153600300005 CORRECTION Results without random coincidence correction. 4153600300006 STATUS (TABLE) Table 1 of J,NIM/A,384,519,1997. 4153600300007 ENDBIB 5 0 4153600300008 NOCOMMON 0 0 4153600300009 DATA 5 3 4153600300010 ELEM1 MASS1 ELEM2 MASS2 DATA 4153600300011 NO-DIM NO-DIM NO-DIM NO-DIM ARB-UNITS 4153600300012 2. 4. 2. 4. 43. 4153600300013 2. 4. 1. 3. 7. 4153600300014 2. 4. 1. 1. 5. 4153600300015 ENDDATA 5 0 4153600300016 ENDSUBENT 15 0 4153600399999 SUBENT 41536004 20100301 41494153600400001 BIB 6 18 4153600400002 REACTION (98-CF-252(0,F)ELEM/MASS,QTR,FY) 4153600400003 Simultaneous emission of two LRA particles accompanying4153600400004 quaternary fission ( to all fission event of Cf-252). 4153600400005 ANALYSIS ASSUMED data and geometrical efficiency were used to 4153600400006 derive probability of simultaneous emission of two 4153600400007 LRA particle accompanying quaternary fission. 4153600400008 ASSUMED (ASSUM,98-CF-252(0,F)2-HE-4,TER,FY) 4153600400009 REL-REF (R,12814001,J.F.Wild+,J,PR/C,32,488,1985) 4153600400010 Reference for ASSUMED data. 4153600400011 In the article given as (3.21+-0.46)E-03. 4153600400012 (D,,S.K.Kataria+,C,73ROCH,2,389,1974) 4153600400013 Data are 5 times smaller than of Kataria's; 4153600400014 The explanation of discrepancy is found by considering4153600400015 the different experimental geometry. 4153600400016 STATUS (TABLE) Text of J,NIM/A,384,519,1997, page 520. 4153600400017 (DEP,41536002) 4153600400018 HISTORY (20100301U) PRT/FIS -> PRD/FIS according to NDS 4153600400019 comments ( S.Dunaeva, N.Otsuka) 4153600400020 ENDBIB 18 0 4153600400021 COMMON 2 3 4153600400022 ASSUM ASSUM-ERR 4153600400023 PRT/FIS PRT/FIS 4153600400024 3.2E-03 0.5E-03 4153600400025 ENDCOMMON 3 0 4153600400026 DATA 6 1 4153600400027 ELEM1 MASS1 ELEM2 MASS2 DATA DATA-ERR 4153600400028 NO-DIM NO-DIM NO-DIM NO-DIM PRD/FIS PRD/FIS 4153600400029 2. 4. 2. 4. 2.9E-07 0.6E-074153600400030 ENDDATA 3 0 4153600400031 ENDSUBENT 30 0 4153600499999 SUBENT 41536005 20100301 41494153600500001 BIB 6 14 4153600500002 REACTION (96-CM-248(0,F)ELEM/MASS,QTR,FY) 4153600500003 Simultaneous emission of two LRA particles accompanying4153600500004 quaternary fission ( to all fission event of Cm-248). 4153600500005 ANALYSIS ASSUMED data and geometrical efficiency were used to 4153600500006 derive probability of simultaneous emission of two 4153600500007 LRA particle accompanying quaternary fission. 4153600500008 ASSUMED (ASSUM,96-CM-248(0,F)2-HE-4,TER,FY) 4153600500009 REL-REF (R,,M.P.Ivanov+,R,JINR-2-65-94,55,1994) 4153600500010 JINR Rapid Com. 2(65)-94, p.55, 1994 year. 4153600500011 Reference for ASSUMED data. 4153600500012 STATUS (TABLE) Text of J,NIM/A,384,519,1997, page 520. 4153600500013 (DEP,41536003) 4153600500014 HISTORY (20100301U) PRT/FIS -> PRD/FIS according to NDS 4153600500015 comments ( S.Dunaeva, N.Otsuka) 4153600500016 ENDBIB 14 0 4153600500017 COMMON 2 3 4153600500018 ASSUM ASSUM-ERR 4153600500019 PRT/FIS PRT/FIS 4153600500020 2.3E-03 0.3E-03 4153600500021 ENDCOMMON 3 0 4153600500022 DATA 6 1 4153600500023 ELEM1 MASS1 ELEM2 MASS2 DATA DATA-ERR 4153600500024 NO-DIM NO-DIM NO-DIM NO-DIM PRD/FIS PRD/FIS 4153600500025 2. 4. 2. 4. 1.4E-07 0.3E-074153600500026 ENDDATA 3 0 4153600500027 ENDSUBENT 26 0 4153600599999 SUBENT 41536006 20100301 41494153600600001 BIB 2 5 4153600600002 REACTION 1(98-CF-252(0,F)2-HE-4,TER,KE) 4153600600003 2(98-CF-252(0,F)2-HE-4,QTR,KE) 4153600600004 Average kinetic energy of LRA in ternary and quaternary4153600600005 fission. 4153600600006 STATUS (TABLE) Text of Fig.3a of J,NIM/A,384,519,1997. 4153600600007 ENDBIB 5 0 4153600600008 NOCOMMON 0 0 4153600600009 DATA 2 1 4153600600010 DATA 1DATA 2 4153600600011 MEV MEV 4153600600012 13.0 11.1 4153600600013 ENDDATA 3 0 4153600600014 ENDSUBENT 13 0 4153600699999 SUBENT 41536007 20100301 41494153600700001 BIB 2 5 4153600700002 REACTION 1(96-CM-248(0,F)2-HE-4,TER,KE) 4153600700003 2(96-CM-248(0,F)2-HE-4,QTR,KE) 4153600700004 Average kinetic energy of LRA in ternary and quaternary4153600700005 fission. 4153600700006 STATUS (TABLE) Text of Fig.3a of J,NIM/A,384,519,1997. 4153600700007 ENDBIB 5 0 4153600700008 NOCOMMON 0 0 4153600700009 DATA 2 1 4153600700010 DATA 1DATA 2 4153600700011 MEV MEV 4153600700012 12.2 10.1 4153600700013 ENDDATA 3 0 4153600700014 ENDSUBENT 13 0 4153600799999 ENDENTRY 7 0 4153699999999