ENTRY 41579 20200720 41884157900000001 SUBENT 41579001 20200720 41884157900100001 BIB 10 65 4157900100002 TITLE The emission of prompt neutrons from the spontaneous 4157900100003 fission of 252No and 244Fm. 4157900100004 AUTHOR (A.I.Svirikhin, A.V.Andreev, V.N.Dushin, M.L.Chelnokov,4157900100005 V.I.Chepigin, M.Gupta, A.V.Isaev, I.N.Izosimov, 4157900100006 D.E.Katrasev, A.N.Kuznetsov, O.N.Malyshev, S.Mullins, 4157900100007 A.G.Popeko, E.A.Sokol, A.V.Yeremin) 4157900100008 INSTITUTE (4ZZZDUB) A.I.Svirikhin, A.V.Andreev, M.L.Chelnokov, 4157900100009 V.I.Chepigin, A.V.Isaev, I.N.Izosimov, D.E.Katrasev, 4157900100010 A.N.Kuznetsov, O.N.Malyshev, A.G.Popeko, E.A.Sokol1, 4157900100011 A.V.Yeremin. 4157900100012 (4RUSRI) V.N.Dushin, 4157900100013 (3INDMNP) Manipal University, Madhav Nagar, Manipal 4157900100014 576104 Karnataka, India. M.Gupta. 4157900100015 (3SAFITH) Laboratory for Accelerator-Based Sciences, 4157900100016 7129 Somerset West, South Africa. S.Mullins. 4157900100017 REFERENCE (J,EPJ/A,48,121,2012) Data for No-252 and Fe-244. 4157900100018 #doi:10.1140/epja/i2012-12121-7 4157900100019 (J,PTE,,(5),50,2011) Data are given for No-252 4157900100020 (J,IET,54,644,2011) Issue.5. 4157900100021 #doi:10.1134/S0020441211040154 4157900100022 Engl.transl.of PTE,,(5),50,2011 4157900100023 See also : 4157900100024 "The helium-3 counters based neutron detector at the 4157900100025 focal plane of VASSILISSA separator." 4157900100026 Abstracts book of 61st Int. Conf. "NUCLEUS-2011" on 4157900100027 problems of nuclear spectroscopy and structure of 4157900100028 atomic nucleus, 10-14 Oct. 2011, Sarov. 4157900100029 (J,FCY/L,9,45,2012) Iss.1. First author A.I.Svirikhin. 4157900100030 Fm-244 data for Subents 005,006. 4157900100031 (J,PPN/L,9,24,2012) Iss.1. Engl.translation of J,FCY/L.4157900100032 #doi:10.1134/S1547477112010141 4157900100033 (J,EPJ/CS,62,03005,2013) Conf.rep. 4157900100034 #doi:10.1051/epjconf/20136203005 4157900100035 Review of experiments. 4157900100036 (J,IZV,79,483,2015) Issue 4. 4157900100037 (J,BAS,79,442,2015) Engl.translation of IZV,79,483,20154157900100038 REL-REF (I,,A.V.Yeremin+,J,PAN,66,1042,2003) 4157900100039 VASSILISSA separator details. 4157900100040 EXP-YEAR (2010) July 2010. 4157900100041 FACILITY (CYCLO,4ZZZDUB) U400 cyclotron of the Flerov Laboratory4157900100042 of Nuclear Reactions. 4157900100043 VASSILISSA electrostatic separator. 4157900100044 DETECTOR (HE3SP) 54 He-3 ( with 10% Ar) counters(30 mm diameter,4157900100045 500 mm long) were mounted around the focal-plane 4157900100046 detector chamber of the VASSILISSA - to detect SF 4157900100047 neutrons.Efficiency was measured by Cm-248 source to be4157900100048 (40+-1.) % . 4157900100049 (SISD) Five 16-strip (60mmx60mm) Si detectors set to 4157900100050 detect FF and alphas. Energy resolution (measured in 4157900100051 tests) is about 25 keV (focal detector) and about 4157900100052 150 keV(backward detectors,FF and alphas registration).4157900100053 Geometry efficiency about 85 % (for alphas). 4157900100054 COMMENT This work was supported in part by the Russian 4157900100055 Foundation for Basic Research, contracts No. 4157900100056 11-02-00490-a and No. 11-02-12001-ofi-m-2011 . 4157900100057 HISTORY (20111024C) M.M. 4157900100058 (20121017A) Reference J,EPJ/A,48,121,2012 was added. 4157900100059 BIB information was added. 4157900100060 Subents 004-007 were added. 4157900100061 (20150225U) Minor correction in ref. J,PTE . 4157900100062 (20150710A) J,IZV,79,(4),483,2015 and it's English 4157900100063 translation refs. were added. 4157900100064 BIB information was updated in STATUS. 4157900100065 (20200720A) Ref. J,EPJ/CS,62,03005,2013 was added. 4157900100066 Information was added in STATUS of Subents 002,005,006.4157900100067 ENDBIB 65 0 4157900100068 NOCOMMON 0 0 4157900100069 ENDSUBENT 68 0 4157900199999 SUBENT 41579002 20200720 41884157900200001 BIB 8 26 4157900200002 REACTION (102-NO-252(0,F),PR,NU) 4157900200003 Average number of prompt neutrons. 4157900200004 SAMPLE Produced in the complete fusion reaction 4157900200005 Ca-48(Pb-206,2N) -> No-252. 4157900200006 Pb-206 of 350 microg/cm**2 layer on Al backing of 4157900200007 3 microm thickness. 4157900200008 METHOD About 1700 events of spontaneous fission was detected 4157900200009 over 24 h exposure. 4157900200010 ANALYSIS The lifetime of the 252No was determined by searching 4157900200011 for ER-alpha and ER-SF correlations and obtain from 4157900200012 analysis of time distribution. 4157900200013 REL-REF (A,41559002,Yu.A.Lazarev+,J,PL/B,52,(3),321,1974) 4157900200014 4.15+-0.30. 4157900200015 (A,41540002,A.V.Yeremin+,J,NIM/A,539,(1-2),441,2005) 4157900200016 4.43+-0.45 . 4157900200017 DECAY-DATA (102-NO-252,2.3SEC) 4157900200018 ERR-ANALYS (DATA-ERR) Not specified. 4157900200019 STATUS (TABLE) Table 1 of J,EPJ/A,48,121,2012, 4157900200020 Text, page 486, and Table of J,IZV,79,(4),483,2015. 4157900200021 Text of Abstract and page 03005-4 4157900200022 in Eur.Phys.J.ser.Conf.,v.62,p.03005,2013. 4157900200023 Text, page 53, of J,PTE,,(5),50,2011 - 4.06+-0.10 4157900200024 Also text of abstracts book of 61th Int. Conf. 4157900200025 "NUCLEUS-2011" on problems of nuclear spectroscopy and 4157900200026 structure of atomic nucleus, page 246. 4157900200027 (DEP,41579004) Neutron distribution. 4157900200028 ENDBIB 26 0 4157900200029 COMMON 1 3 4157900200030 ERR-HL 4157900200031 SEC 4157900200032 0.1 4157900200033 ENDCOMMON 3 0 4157900200034 DATA 2 1 4157900200035 DATA DATA-ERR 4157900200036 PRT/FIS PRT/FIS 4157900200037 4.06 0.12 4157900200038 ENDDATA 3 0 4157900200039 ENDSUBENT 38 0 4157900299999 SUBENT 41579003 20150710 41694157900300001 BIB 5 11 4157900300002 REACTION (102-NO-252(0,F),PRE,AKE,LF+HF) 4157900300003 Total kinetic energy before neutron emission. 4157900300004 SAMPLE Produced in the complete fusion reaction 4157900300005 Ca-48(Pb-206,2N) -> No-252. 4157900300006 Pb-206 of 350 microg/cm**2 layer on Al backing of 4157900300007 3 microm thickness. 4157900300008 METHOD About 1700 events of spontaneous fission was detected 4157900300009 over 24 h exposure. 4157900300010 STATUS (TABLE) Text, page 54, of J,PTE,,(5),50,2011 . 4157900300011 HISTORY (20121220A) FF -> LF+HF in SF7 according to comment of 4157900300012 N.Otsuka (NDS,IAEA). 4157900300013 ENDBIB 11 0 4157900300014 NOCOMMON 0 0 4157900300015 DATA 1 1 4157900300016 DATA 4157900300017 MEV 4157900300018 199. 4157900300019 ENDDATA 3 0 4157900300020 ENDSUBENT 19 0 4157900399999 SUBENT 41579004 20150710 41694157900400001 BIB 8 16 4157900400002 REACTION (102-NO-252(0,F),PR/NUM,NU) 4157900400003 SAMPLE Produced in the complete fusion reaction 4157900400004 Ca-48(Pb-206,2N) -> No-252. 4157900400005 Pb-206 of 350 microg/cm**2 layer on Al backing of 4157900400006 3 microm thickness. 4157900400007 METHOD About 1700 events of spontaneous fission was detected 4157900400008 over 24 h exposure. 4157900400009 ANALYSIS Neutron emission probabilities were determined from the4157900400010 multiplicity of the detected neutrons by taking 4157900400011 the detector efficiency 40 +- 1% into account using 4157900400012 the STREG algorithm. 4157900400013 REL-REF (M,,M.Dakowski+,J,NIM,113,195,1973) STREG algorithm. 4157900400014 MISC-COL (MISC) Number of counts measured. 4157900400015 ERR-ANALYS (DATA-ERR) Not specified. 4157900400016 STATUS (TABLE) Text, page 4, fig. 4 of J,EPJ/A,48,121,2012. 4157900400017 Data on Fig.3 of J,IZV,79,(4),483,2015. 4157900400018 ENDBIB 16 0 4157900400019 NOCOMMON 0 0 4157900400020 DATA 5 10 4157900400021 PART-OUT DATA DATA-ERR MISC MISC-ERR 4157900400022 NO-DIM NO-DIM NO-DIM SEE TEXT SEE TEXT 4157900400023 0. 0.000 0.042 226. 15. 4157900400024 1. 0.000 0.042 548. 23. 4157900400025 2. 0.085 0.042 543. 23. 4157900400026 3. 0.257 0.043 280. 17. 4157900400027 4. 0.305 0.044 76. 9. 4157900400028 5. 0.235 0.044 21. 5. 4157900400029 6. 0.109 0.044 2. 1.4 4157900400030 7. 0.008 0.045 4157900400031 8. 0.000 0.046 4157900400032 9. 0.000 0.045 4157900400033 ENDDATA 12 0 4157900400034 ENDSUBENT 33 0 4157900499999 SUBENT 41579005 20200720 41884157900500001 BIB 8 17 4157900500002 REACTION (100-FM-244(0,F),PR,NU) 4157900500003 Average number of prompt neutrons. 4157900500004 SAMPLE Produced in the complete fusion reaction 4157900500005 Ar-40(Pb-206,2N) -> Fm-244. 4157900500006 METHOD 212 events of spontaneous fission was detected over 4157900500007 7 day experiment (1.6E+18 ions of 40Ar on the target). 4157900500008 ASSUMED (ASSUM,82-PB-206(18-AR-40,2N)100-FM-244,,SIG) 4157900500009 ANALYSIS The lifetime of the 244Fm was determined by analysis 4157900500010 of the correlations between ER and SF events. 4157900500011 DECAY-DATA (100-FM-244,3.47E-3SEC) 4157900500012 ERR-ANALYS (DATA-ERR) Not specified. 4157900500013 STATUS (TABLE) Table 1 of J,EPJ/A,48,121,2012. 4157900500014 Text, page 50 of J,FCY/L,9,(1),45,2012. 4157900500015 Text of Abstract and page 03005-4 4157900500016 in Eur.Phys.J.ser.Conf.,v.62,p.03005,2013. 4157900500017 Text,page 486, Table of J,IZV,79,(4),483,2015. 4157900500018 (DEP,41579007) Neutron distribution. 4157900500019 ENDBIB 17 0 4157900500020 COMMON 2 3 4157900500021 ERR-HL ASSUM 4157900500022 MSEC NB 4157900500023 0.26 3. 4157900500024 ENDCOMMON 3 0 4157900500025 DATA 2 1 4157900500026 DATA DATA-ERR 4157900500027 PRT/FIS PRT/FIS 4157900500028 3.3 0.3 4157900500029 ENDDATA 3 0 4157900500030 ENDSUBENT 29 0 4157900599999 SUBENT 41579006 20200720 41884157900600001 BIB 9 25 4157900600002 REACTION (100-FM-244(0,F),PRE,AKE,LF+HF) 4157900600003 Pre-neutron total kinetic energy. 4157900600004 SAMPLE Produced in the complete fusion reaction 4157900600005 Ar-40(Pb-206,2N) -> Fm-244. 4157900600006 METHOD 212 events of spontaneous fission was detected over 4157900600007 7 day experiment (1.6E+18 ions of 40Ar on the target). 4157900600008 No alpha-decay was detected. 4157900600009 REL-REF (A,,J.Khuyagbaatar+,J,EPJ/A,37,177,2008) 193+-12 MeV 4157900600010 (A,,D.D.Bogdanov+,R,JINR-P15-81-706,1981) 196.0MeV 4157900600011 Also agree with authors' calculations. 4157900600012 DECAY-DATA (100-FM-244,3.53MSEC) 4157900600013 3.53+-0.35 msec measured by authors. 4157900600014 ASSUMED (ASSUM,102-NO-252(0,F),PRE,AKE,LF+HF) 4157900600015 No-252 TKE spectrum was used for preliminary 4157900600016 calibration. 4157900600017 ERR-ANALYS (DATA-ERR) Not specified. 4157900600018 STATUS (TABLE) 4157900600019 Table 1 of J,EPJ/A,48,121,2012 -198+-15 MeV 4157900600020 Text of Abstract and page 02005-4 4157900600021 in Eur.Phys.J.ser.Conf.,v.62,p.03005,2013 -198+-15 MeV4157900600022 Table of J,IZV,79,(4),483,2015 -198+-15 MeV 4157900600023 Text, page 50, of J,FCY/L,9,(1),45,2012 -195+-14MeV. 4157900600024 Text, page 487 of J,IZV,79,(4),483,2015 - 195+-14 MeV 4157900600025 HISTORY (20121220A) FF -> LF+HF in SF7 according to comment of 4157900600026 N.Otsuka (NDS,IAEA). 4157900600027 ENDBIB 25 0 4157900600028 NOCOMMON 0 0 4157900600029 DATA 4 1 4157900600030 DATA DATA-ERR ERR-HL ASSUM 4157900600031 MEV MEV MSEC MEV 4157900600032 195. 14. 0.35 198.7 4157900600033 ENDDATA 3 0 4157900600034 ENDSUBENT 33 0 4157900699999 SUBENT 41579007 20150710 41694157900700001 BIB 8 16 4157900700002 REACTION (100-FM-244(0,F),PR/NUM,NU) 4157900700003 SAMPLE Produced in the complete fusion reaction 4157900700004 Ar-40(Pb-206,2N) -> Fm-244. 4157900700005 METHOD 212 events of spontaneous fission was detected over 4157900700006 7 day experiment (1.6E+18 ions of 40Ar on the target). 4157900700007 ANALYSIS The multiplicity distribution of prompt neutrons from 4157900700008 the SF of 244Fm was determined from the multiplicity of4157900700009 the detected neutrons by taking the detector efficiency4157900700010 40 +- 1 % into account using the statistical 4157900700011 regularization method. 4157900700012 REL-REF (M,,M.Dakowski+,J,NIM,113,195,1973) 4157900700013 Regularization method. 4157900700014 MISC-COL (MISC) Number of counts measured. 4157900700015 ERR-ANALYS (DATA-ERR) Not specified. 4157900700016 STATUS (TABLE) Text, page 5, fig. 5 of J,EPJ/A,48,121,2012. 4157900700017 Data on Fig.4 of J,IZV,79,(4),483,2015. 4157900700018 ENDBIB 16 0 4157900700019 NOCOMMON 0 0 4157900700020 DATA 5 8 4157900700021 PART-OUT DATA DATA-ERR MISC MISC-ERR 4157900700022 NO-DIM NO-DIM NO-DIM SEE TEXT SEE TEXT 4157900700023 0. 0.000 0.094 40. 6. 4157900700024 1. 0.078 0.085 81. 9. 4157900700025 2. 0.243 0.085 49. 7. 4157900700026 3. 0.256 0.086 34. 6. 4157900700027 4. 0.212 0.086 7. 2. 4157900700028 5. 0.145 0.085 1. 1. 4157900700029 6. 0.064 0.087 4157900700030 7. 0.003 0.085 4157900700031 ENDDATA 10 0 4157900700032 ENDSUBENT 31 0 4157900799999 ENDENTRY 7 0 4157999999999