ENTRY 41741 20240705 421741741000 1 SUBENT 41741001 20240705 421741741001 1 BIB 12 63 41741001 2 TITLE Comparative study of spontaneous-fission 41741001 3 characteristics of 252No and 254No isotopes 41741001 4 AUTHOR (A.V.Isaev,A.V.Andreev, M.L.Chelnokov, V.I.Chepigin, 41741001 5 I.N.Izosimov, A.A.Kuznetsova, O.N.Malyshev, R.S.Mukhin,41741001 6 A.G.Popeko, Y.A.Popov, T.M.Shneidman, E.A.Sokol, 41741001 7 A.I.Svirikhin, M.S.Tezekbayeva, A.V.Yeremin, 41741001 8 N.I.Zamyatin, P.Brionnet, O.Dorvaux, B.Gall, K.Kessaci,41741001 9 A.Sellam,K.Hauschild,A.Lopez-Martens,S.Antalic,P.Mosat)41741001 10 Order of author names is different in Russian original41741001 11 and it's English translation. 41741001 12 REFERENCE (J,PPN/L,18,449,2021) Engl.translation of: 41741001 13 #doi:10.1134/S1547477121040087 41741001 14 (J,FCY/L,18,362,2021) Issue 4. 41741001 15 INSTITUTE (4ZZZDUB) A.V.Isaev, A.V.Andreev, M.L.Chelnokov, 41741001 16 V.I.Chepigin,I.N.Izosimov, A.A.Kuznetsova,O.N.Malyshev,41741001 17 R.S.Mukhin, A.G.Popeko, Y.A.Popov, T.M.Shneidman, 41741001 18 E.A.Sokol, A.I.Svirikhin, M.S.Tezekbayeva, A.V.Yeremin,41741001 19 N.I.Zamyatin 41741001 20 (4RUSDBU) O.N.Malyshev, A.G.Popeko, Y.A.Popov, 41741001 21 A.I.Svirikhin, A.V.Yeremin 41741001 22 (4KASKAZ) M.S.Tezekbayeva 41741001 23 (2FR STR) P.Brionnet, O.Dorvaux, B.Gall, K.Kessaci, 41741001 24 A.Sellam 41741001 25 (2FR PAR) K.Hauschild, A.Lopez-Martens 41741001 26 (3SLKUB) S.Antalic, P.Mosat 41741001 27 REL-REF (I,,A.G.Popeko+,J,NIM/B,376,140,2016) 41741001 28 SHELS separator details. 41741001 29 FACILITY (CYCLO,4ZZZDUB) U400 cyclotron of the Flerov Laboratory41741001 30 of Nuclear Reactions. Calcium-ion energy at the middle 41741001 31 of the target amounts to 215 +- 2 MeV. 41741001 32 SHELS separator. 41741001 33 SAMPLE Produced in the reaction 41741001 34 Ca-48(Pb-206/208,2N) -> No-252/254 on 41741001 35 - 206PbS of 97% enrichment, 350 microgram/cm2 thickness41741001 36 - 208PbS of 99.57% enrichment, 370 microgram/cm2 41741001 37 thickness, admixtures 206Pb - 0.14 %, 207Pb -0.29%. 41741001 38 Both samples on 2 micron thick Ti backings. 41741001 39 ASSUMED (ASSUM1,82-PB-206(20-CA-48,2N)102-NO-252,,SIG) 41741001 40 (ASSUM2,82-PB-208(20-CA-48,2N)102-NO-254,,SIG) 41741001 41 The cross sections of the 2n-evaporation channel of 41741001 42 reactions whereby the 252No and 254No isotopes are 41741001 43 produced are estimated 800 and 1800 nb, respectively. 41741001 44 DETECTOR (SISD) The 300-micron-thick focal SSD formed by 48 x 4841741001 45 silicon strips has an active area of 58 x 58 mm2, 41741001 46 a position resolution of 1 x 1 mm2, an energy 41741001 47 resolution near 20 keV for 8-MeV alpha particles. 41741001 48 Efficiency of the fission fragments and alpha 41741001 49 particles detection 100% and 50 %, respectively. 41741001 50 (HE3SP) 54 He-3 proportional counters(32 mm diameter, 41741001 51 500 mm long, 7 atm pressure) were used for detection of41741001 52 prompt neutrons from spontaneous fission. 41741001 53 One neutron registration 43+-1 % was measured by 248Cm 41741001 54 source. 41741001 55 (SCIN) LaBr(3)(Ce) crystal with a photomultiplier 41741001 56 Hamamatsu-R7600 was used for SF gamma quanta 41741001 57 registration. 41741001 58 METHOD 853 events for No-252 SF, 174 for No-254 SF. 41741001 59 COMMENT This work was supported in part by the Russian 41741001 60 Foundation for Basic Research, contracts No. 41741001 61 18-52-15004. 41741001 62 HISTORY (20211007C) M.M. 41741001 63 (20240705A) Subent 006 DATA-ERR was corrected. 41741001 64 STATUS was updated in all data Subents. 41741001 65 ENDBIB 63 0 41741001 66 COMMON 2 3 41741001 67 ASSUM1 ASSUM2 41741001 68 NB NB 41741001 69 800. 1800. 41741001 70 ENDCOMMON 3 0 41741001 71 ENDSUBENT 70 0 4174100199999 SUBENT 41741002 20240705 421741741002 1 BIB 7 9 41741002 2 REACTION (102-NO-252(0,F),PRE,AKE,LF+HF) 41741002 3 ANALYSIS TKE spectrum was fitted by Gaussian. 41741002 4 ASSUMED (ASSUM3,102-NO-252(0,F),PRE,AKE,LF+HF) 41741002 5 Value used for calibration of TKE spectrum. 41741002 6 REL-REF (R,14541002,C.E.Bemis Jr+,J,PR/C,15,705,1977) 41741002 7 ASSUM3 value 41741002 8 DECAY-DATA (102-NO-252-G,2.46SEC) 2.46+-0.05 sec measured. 41741002 9 ERR-ANALYS (DATA-ERR) Error of Gaussian peak determination. 41741002 10 STATUS (TABLE,,A.V.Isaev+,J,PPN/L,18,449,2021) Text page 452 41741002 11 ENDBIB 9 0 41741002 12 COMMON 3 3 41741002 13 ERR-HL ASSUM3 ASSUM3-ERR 41741002 14 SEC MEV MEV 41741002 15 0.05 202.4 1.2 41741002 16 ENDCOMMON 3 0 41741002 17 DATA 2 1 41741002 18 DATA DATA-ERR 41741002 19 MEV MEV 41741002 20 198.7 1.1 41741002 21 ENDDATA 3 0 41741002 22 ENDSUBENT 21 0 4174100299999 SUBENT 41741003 20240705 421741741003 1 BIB 6 7 41741003 2 REACTION (102-NO-254(0,F),PRE,AKE,LF+HF) 41741003 3 ANALYSIS The same TKE spectrum calibration as for No-252 . 41741003 4 DECAY-DATA (102-NO-254-G,44.1SEC) 44.1+-1.0 sec measured. 41741003 5 REL-REF (D,14054001,J.F.Wild+,J,JALC,213-214,86,1994) 41741003 6 198.2 MeV 41741003 7 ERR-ANALYS (DATA-ERR) Error of Gaussian peak determination. 41741003 8 STATUS (TABLE,,A.V.Isaev+,J,PPN/L,18,449,2021) Text page 452 41741003 9 ENDBIB 7 0 41741003 10 COMMON 1 3 41741003 11 ERR-HL 41741003 12 SEC 41741003 13 1.0 41741003 14 ENDCOMMON 3 0 41741003 15 DATA 2 1 41741003 16 DATA DATA-ERR 41741003 17 MEV MEV 41741003 18 207.2 1.1 41741003 19 ENDDATA 3 0 41741003 20 ENDSUBENT 19 0 4174100399999 SUBENT 41741004 20240705 421741741004 1 BIB 6 11 41741004 2 REACTION 1(102-NO-252(0,F),PR,NU) 41741004 3 2(102-NO-252(0,F),PR,NU,,RAW) 41741004 4 CORRECTION1 Corrected for neutron detection efficiency. 41741004 5 2 Not corrected for neutron detection efficiency. 41741004 6 DECAY-DATA (102-NO-252-G,2.46SEC) 2.46+-0.05 sec measured. 41741004 7 REL-REF (A,41559002,Yu.A.Lazarev+,J,PL/B,52,321,1974) 41741004 8 (A,41540002,A.V.Yeremin+,J,NIM/A,539,441,2005) 41741004 9 ERR-ANALYS (DATA-ERR) Includes statistical uncertainty and 41741004 10 uncertainty arising from the spread of the neutron 41741004 11 detector efficiency. 41741004 12 STATUS (TABLE,,A.V.Isaev+,J,PPN/L,18,449,2021) Text page 452 41741004 13 ENDBIB 11 0 41741004 14 COMMON 1 3 41741004 15 ERR-HL 41741004 16 SEC 41741004 17 0.05 41741004 18 ENDCOMMON 3 0 41741004 19 DATA 4 1 41741004 20 DATA 1DATA-ERR 1DATA 2DATA-ERR 2 41741004 21 PRT/FIS PRT/FIS PRT/FIS PRT/FIS 41741004 22 4.51 0.25 1.94 0.10 41741004 23 ENDDATA 3 0 41741004 24 ENDSUBENT 23 0 4174100499999 SUBENT 41741005 20240705 421741741005 1 BIB 5 9 41741005 2 REACTION 1(102-NO-254(0,F),PR,NU) 41741005 3 2(102-NO-254(0,F),PR,NU,,RAW) 41741005 4 CORRECTION1 Corrected for neutron detection efficiency. 41741005 5 2 Not corrected for neutron detection efficiency. 41741005 6 DECAY-DATA (102-NO-254-G,44.1SEC) 44.1+-1.0 sec measured. 41741005 7 ERR-ANALYS (DATA-ERR) Includes statistical uncertainty and 41741005 8 uncertainty arising from the spread of the neutron 41741005 9 detector efficiency. 41741005 10 STATUS (TABLE,,A.V.Isaev+,J,PPN/L,18,449,2021) Text page 452 41741005 11 ENDBIB 9 0 41741005 12 COMMON 1 3 41741005 13 ERR-HL 41741005 14 SEC 41741005 15 1.0 41741005 16 ENDCOMMON 3 0 41741005 17 DATA 4 1 41741005 18 DATA 1DATA-ERR 1DATA 2DATA-ERR 2 41741005 19 PRT/FIS PRT/FIS PRT/FIS PRT/FIS 41741005 20 2.10 0.22 4.88 0.53 41741005 21 ENDDATA 3 0 41741005 22 ENDSUBENT 21 0 4174100599999 SUBENT 41741006 20240705 421741741006 1 BIB 7 16 41741006 2 REACTION 1(102-NO-254(0,F),PR/NUM,NU) 41741006 3 2(102-NO-254(0,F),PR/NUM,NU,,RAW) 41741006 4 DECAY-DATA (102-NO-254-G,44.1SEC) 44.1+-1.0 sec measured. 41741006 5 ANALYSIS 1 Derived from directly measured data by a priori 41741006 6 known neutron average number and it's dispersion 41741006 7 using the statistical-regularization method 41741006 8 of A.N.Tikhonov (see REL-REF) 41741006 9 2 Directly measured data 41741006 10 REL-REF (N,,V.F.Turchin+,J,UFN,102,345,1970) Issue 3. 41741006 11 (N,,V.F.Turchin+,J,SPU,13,681,1971) Engl.translation. 41741006 12 Issue 6. 41741006 13 ERR-ANALYS (DATA-ERR) Type of uncertainty is not explained in the 41741006 14 article. 41741006 15 STATUS (TABLE,,A.V.Isaev+,J,PPN/L,18,449,2021) Table 2. 41741006 16 HISTORY (20240705A) Zero DATA-ERR was deleted( absent in the 41741006 17 table of the article). 41741006 18 ENDBIB 16 0 41741006 19 NOCOMMON 0 0 41741006 20 DATA 5 10 41741006 21 PART-OUT DATA 1DATA-ERR 1DATA 2DATA-ERR 2 41741006 22 NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM 41741006 23 0. 0. 0.023 0.069 0.023 41741006 24 1. 0. 0.025 0.277 0.046 41741006 25 2. 0.059 0.070 0.292 0.047 41741006 26 3. 0.140 0.079 0.231 0.042 41741006 27 4. 0.208 0.082 0.108 0.029 41741006 28 5. 0.241 0.083 0.023 0.013 41741006 29 6. 0.098 0. 0.218 41741006 30 7. 0.092 0. 0.131 41741006 31 8. 0.050 0. 0.003 41741006 32 9. 0.060 0. 41741006 33 ENDDATA 12 0 41741006 34 ENDSUBENT 33 0 4174100699999 ENDENTRY 6 0 4174199999999