ENTRY 41539 20200625 41884153900000001 SUBENT 41539001 20200625 41884153900100001 BIB 11 58 4153900100002 TITLE Neutron multiplicity at spontaneous fission of Fm-246.4153900100003 AUTHOR (A.I.Svirikhin, V.N.Dushin, M.L.Chelnokov,V.I.Chepigin,4153900100004 I.N.Izosimov, D.E.Katrasev, O.N.Malyshev, A.Minkova, 4153900100005 A.G.Popeko, E.A.Sokol, A.V.Yeremin) 4153900100006 INSTITUTE (4ZZZDUB) A.I.Svirikhin, M.L.Chelnokov, V.I.Chepigin, 4153900100007 I.N.Izosimov, D.E.Katrasev, O.N.Malyshev, 4153900100008 A.G.Popeko, E.A.Sokol, A.V.Yeremin. 4153900100009 (4RUSRI) V.N.Dushin. 4153900100010 (3BULBLA) A.Minkova. 4153900100011 REFERENCE (J,EPJ/A,44,393,2010) Issue 3. 4153900100012 #doi:10.1140/epja/i2010-10968-0 4153900100013 (J,FCY/L,9,45,2012) Issue 1.First author A.I.Svirikhin.4153900100014 Page of this article in hard copy - 45-52. 4153900100015 (J,PPN/L,9,24,2012) Iss.1 Engl.translation of J,FCY/L. 4153900100016 #doi:10.1134/S1547477112010141 4153900100017 (J,EPJ/CS,62,03005,2013) 4153900100018 #doi:10.1051/epjconf/20136203005 4153900100019 Review of experiments. 4153900100020 (J,IZV,79,483,2015) Issue 4. 4153900100021 Report at Conf. NUCLEUS-2014. 4153900100022 (J,BAS,79,442,2015) Engl.translation of IZV,79,483 4153900100023 REL-REF (I,,A.V.Yeremin+,J,PAN,66,1042,2003) 4153900100024 Recoil separator VASSILISSA 4153900100025 (M,,M.Dakowski+,J,NIM,113,195,1973) 4153900100026 Regularization method of analysis. 4153900100027 (O,41579001,A.I.Svirikhin+,J,EPJ/A,48,121,2012) 4153900100028 Data for No-252. 4153900100029 (O,41586001,A.I.Svirikhin+,J,FCY/L,9,(1),45,2012) 4153900100030 Data for Fm-244. 4153900100031 FACILITY (CYCLO,4ZZZDUB) FLNR Dubna U400 cyclotron for sample 4153900100032 producing. 4153900100033 VASSILISSA electrostatic separator. 4153900100034 DETECTOR (HE3SP) 54 He-3 filled counters were mounted around the4153900100035 focal-plane detector chamber of the VASSILISSA, 4153900100036 in three concentric rings, covered by organic glass 4153900100037 and boron polyethylene, both of 5 cm in thickness. 4153900100038 Efficiency of detection of neutron measured using 4153900100039 chamber with Cm-248 source and Si detector (1 cm**2 4153900100040 pin-diode), placed in the position of the focal-plane 4153900100041 semiconductor detector, was 36+-1 %. 4153900100042 ANALYSIS (REGUL) Average number of prompt neutrons and 4153900100043 multi-neutron emission probabilities for Fm-246 was 4153900100044 determined from the multiplicity of detected neutrons 4153900100045 by the detector efficiency using the statistical 4153900100046 regularization method. 4153900100047 ADD-RES Measured HL of Fm-246 = (1.3 +- 0.2) s. 4153900100048 SF branching ratio for Fm-246 was estimated to be 4153900100049 (5+-3)%. 4153900100050 COMMENT Work was performed partially under the financial 4153900100051 support of the Russian Foundation for Basic Research, 4153900100052 contract No.08-02-00116-a. 4153900100053 HISTORY (20100706C) M.M. 4153900100054 (20120503A) Ref. J,FCY/L,9,(1),45,2012 was added. 4153900100055 (20130707A) NPART code was deleted in Subents 003,004. 4153900100056 (20150707A) Refs. ot J,IZV,79,(4),483,2015 and it's 4153900100057 Engl.translation were added. 4153900100058 BIB information was updated. 4153900100059 (20200625A) Ref. EPJ/CS was added. 4153900100060 ENDBIB 58 0 4153900100061 NOCOMMON 0 0 4153900100062 ENDSUBENT 61 0 4153900199999 SUBENT 41539002 20200625 41884153900200001 BIB 6 22 4153900200002 REACTION (100-FM-246(0,F),PR,NU) 4153900200003 Average number of prompt neutrons. 4153900200004 SAMPLE Produced in the complete fusion reaction 4153900200005 Ar-40(Pb-208,2n). 4153900200006 Ar-40 beam of (2-3)*10**12 1/s, energy of 186+-2MeV 4153900200007 (determined by TOF) on enriched lead target 4153900200008 Pb-208 - 97.2%, Pb-206 - 1.0%, Pb-207 - 1.8%, of 4153900200009 average thickness 280 microg/cm**2, fabricated by 4153900200010 evaporation of the metal onto the 0.8microg/cm**2 Al 4153900200011 backing foils. Produced evaporation (ER) residues were4153900200012 separated in flight by the VASSILISSA. 4153900200013 EXP-YEAR (2008) October 2008. 4153900200014 MISC-COL (MISC) Variance of multiplicity distribution. 4153900200015 ERR-ANALYS (DATA-ERR) Not specified. 4153900200016 STATUS (TABLE) 4153900200017 Text, page 395 of J,EPJ/A. 4153900200018 Text of Abstract and page 02005-4 4153900200019 in Eur.Phys.J.ser.Conf.,v.62,p.03005,2013. 4153900200020 Text,page 48 of J,FCY/L,9,(1),45,2012 3.6+-0.5 prt/fis4153900200021 Table of J,IZV,79,(4),483,2015 - 3.6 prt/fis, 4153900200022 text page 458 - 3.55+-0.50 . 4153900200023 (DEP,41539003) Neutron distribution. 4153900200024 ENDBIB 22 0 4153900200025 NOCOMMON 0 0 4153900200026 DATA 3 1 4153900200027 DATA DATA-ERR MISC 4153900200028 PRT/FIS PRT/FIS SEE TEXT 4153900200029 3.55 0.50 4. 4153900200030 ENDDATA 3 0 4153900200031 ENDSUBENT 30 0 4153900299999 SUBENT 41539003 20150707 41694153900300001 BIB 7 21 4153900300002 REACTION (100-FM-246(0,F),PR/NUM,NU) 4153900300003 Probability of emission of N prompt neutrons. 4153900300004 SAMPLE Produced in the complete fusion reaction 4153900300005 Ar-40(Pb-208,2n). 4153900300006 Ar-40 beam of (2-3)*10**12 1/s, energy of 186+-2MeV 4153900300007 (determined by TOF) on enriched lead target 4153900300008 Pb-208 - 97.2%, Pb-206 - 1.0%, Pb-207 - 1.8%) of 4153900300009 average thickness 280 microg/cm**2, fabricated by 4153900300010 evaporation of the metal onto the 0.8microg/cm**2 Al 4153900300011 backing foils. Produced evaporation (ER) residues were4153900300012 separated in flight by the VASSILISSA. 4153900300013 EXP-YEAR (2008) October 2008. 4153900300014 MISC-COL (MISC) Distribution of multiplicity of detected prompt 4153900300015 neutrons, normalized to 1. - Fig.4 top of EPJ/A. 4153900300016 COMMENT Of author. Statistics is 108 counts fission. 4153900300017 STATUS (TABLE) Presented on Fig.4 bottom of J,EPJ/A , 4153900300018 Fig.2b of J,FCY/L,9,(1),45,2012; Fig.2top of IZV,79 4153900300019 Request for the data was sent to author A.I.Svirikhin 4153900300020 06.07.2010. Data were received from A.I.Svirikhin 4153900300021 06.07.2010. 4153900300022 HISTORY (20100706R) From A.I.Svirikhin 4153900300023 ENDBIB 21 0 4153900300024 NOCOMMON 0 0 4153900300025 DATA 3 9 4153900300026 PART-OUT DATA MISC 4153900300027 NO-DIM NO-DIM NO-DIM 4153900300028 0. 0.01681 0.24074 4153900300029 1. 0.0266 0.28704 4153900300030 2. 0.22271 0.34259 4153900300031 3. 0.24607 0.09259 4153900300032 4. 0.2106 0.03704 4153900300033 5. 0.17275 0. 4153900300034 6. 0.09241 0. 4153900300035 7. 0.01206 0. 4153900300036 8. 0. 0. 4153900300037 ENDDATA 11 0 4153900300038 ENDSUBENT 37 0 4153900399999 SUBENT 41539004 20150707 41694153900400001 BIB 6 14 4153900400002 REACTION (96-CM-248(0,F),PR/NUM,NU) 4153900400003 Probability of emission of N prompt neutrons. 4153900400004 METHOD Off-line measurements to exclude the methodical error 4153900400005 and to compare the distributions. 4153900400006 SAMPLE Al foil (1.2 micron) with a small quantity of curium 4153900400007 chloride was placed inside the focal-plane detector. 4153900400008 MISC-COL (MISC) Distribution of multiplicity of detected prompt 4153900400009 neutrons, normalized to 1. - Fig.4 top. 4153900400010 STATUS (TABLE) Presented on Fig.4 bottom of J,EPJ/A , 4153900400011 Fig.2b of J,FCY/L,9,(1),45,2012. 4153900400012 Request for the data was sent to author A.I.Svirikhin 4153900400013 06.07.2010. Data were received from A.I.Svirikhin 4153900400014 06.07.2010. 4153900400015 HISTORY (20100706R) From A.I.Svirikhin 4153900400016 ENDBIB 14 0 4153900400017 NOCOMMON 0 0 4153900400018 DATA 3 9 4153900400019 PART-OUT DATA MISC 4153900400020 NO-DIM NO-DIM NO-DIM 4153900400021 0. 0.0012 0.27029 4153900400022 1. 0.0611 0.40423 4153900400023 2. 0.2055 0.23878 4153900400024 3. 0.3216 0.07289 4153900400025 4. 0.2871 0.01235 4153900400026 5. 0.1148 0.00127 4153900400027 6. 1.4E-4 1.69969E-4 4153900400028 7. 0.0079 1.21406E-5 4153900400029 8. 0. 0. 4153900400030 ENDDATA 11 0 4153900400031 ENDSUBENT 30 0 4153900499999 ENDENTRY 4 0 4153999999999