ENTRY 41741 20240705 42174174100000001 SUBENT 41741001 20240705 42174174100100001 BIB 12 63 4174100100002 TITLE Comparative study of spontaneous-fission 4174100100003 characteristics of 252No and 254No isotopes 4174100100004 AUTHOR (A.V.Isaev,A.V.Andreev, M.L.Chelnokov, V.I.Chepigin, 4174100100005 I.N.Izosimov, A.A.Kuznetsova, O.N.Malyshev, R.S.Mukhin,4174100100006 A.G.Popeko, Y.A.Popov, T.M.Shneidman, E.A.Sokol, 4174100100007 A.I.Svirikhin, M.S.Tezekbayeva, A.V.Yeremin, 4174100100008 N.I.Zamyatin, P.Brionnet, O.Dorvaux, B.Gall, K.Kessaci,4174100100009 A.Sellam,K.Hauschild,A.Lopez-Martens,S.Antalic,P.Mosat)4174100100010 Order of author names is different in Russian original4174100100011 and it's English translation. 4174100100012 REFERENCE (J,PPN/L,18,449,2021) Engl.translation of: 4174100100013 #doi:10.1134/S1547477121040087 4174100100014 (J,FCY/L,18,362,2021) Issue 4. 4174100100015 INSTITUTE (4ZZZDUB) A.V.Isaev, A.V.Andreev, M.L.Chelnokov, 4174100100016 V.I.Chepigin,I.N.Izosimov, A.A.Kuznetsova,O.N.Malyshev,4174100100017 R.S.Mukhin, A.G.Popeko, Y.A.Popov, T.M.Shneidman, 4174100100018 E.A.Sokol, A.I.Svirikhin, M.S.Tezekbayeva, A.V.Yeremin,4174100100019 N.I.Zamyatin 4174100100020 (4RUSDBU) O.N.Malyshev, A.G.Popeko, Y.A.Popov, 4174100100021 A.I.Svirikhin, A.V.Yeremin 4174100100022 (4KASKAZ) M.S.Tezekbayeva 4174100100023 (2FR STR) P.Brionnet, O.Dorvaux, B.Gall, K.Kessaci, 4174100100024 A.Sellam 4174100100025 (2FR PAR) K.Hauschild, A.Lopez-Martens 4174100100026 (3SLKUB) S.Antalic, P.Mosat 4174100100027 REL-REF (I,,A.G.Popeko+,J,NIM/B,376,140,2016) 4174100100028 SHELS separator details. 4174100100029 FACILITY (CYCLO,4ZZZDUB) U400 cyclotron of the Flerov Laboratory4174100100030 of Nuclear Reactions. Calcium-ion energy at the middle 4174100100031 of the target amounts to 215 +- 2 MeV. 4174100100032 SHELS separator. 4174100100033 SAMPLE Produced in the reaction 4174100100034 Ca-48(Pb-206/208,2N) -> No-252/254 on 4174100100035 - 206PbS of 97% enrichment, 350 microgram/cm2 thickness4174100100036 - 208PbS of 99.57% enrichment, 370 microgram/cm2 4174100100037 thickness, admixtures 206Pb - 0.14 %, 207Pb -0.29%. 4174100100038 Both samples on 2 micron thick Ti backings. 4174100100039 ASSUMED (ASSUM1,82-PB-206(20-CA-48,2N)102-NO-252,,SIG) 4174100100040 (ASSUM2,82-PB-208(20-CA-48,2N)102-NO-254,,SIG) 4174100100041 The cross sections of the 2n-evaporation channel of 4174100100042 reactions whereby the 252No and 254No isotopes are 4174100100043 produced are estimated 800 and 1800 nb, respectively. 4174100100044 DETECTOR (SISD) The 300-micron-thick focal SSD formed by 48 x 484174100100045 silicon strips has an active area of 58 x 58 mm2, 4174100100046 a position resolution of 1 x 1 mm2, an energy 4174100100047 resolution near 20 keV for 8-MeV alpha particles. 4174100100048 Efficiency of the fission fragments and alpha 4174100100049 particles detection 100% and 50 %, respectively. 4174100100050 (HE3SP) 54 He-3 proportional counters(32 mm diameter, 4174100100051 500 mm long, 7 atm pressure) were used for detection of4174100100052 prompt neutrons from spontaneous fission. 4174100100053 One neutron registration 43+-1 % was measured by 248Cm 4174100100054 source. 4174100100055 (SCIN) LaBr(3)(Ce) crystal with a photomultiplier 4174100100056 Hamamatsu-R7600 was used for SF gamma quanta 4174100100057 registration. 4174100100058 METHOD 853 events for No-252 SF, 174 for No-254 SF. 4174100100059 COMMENT This work was supported in part by the Russian 4174100100060 Foundation for Basic Research, contracts No. 4174100100061 18-52-15004. 4174100100062 HISTORY (20211007C) M.M. 4174100100063 (20240705A) Subent 006 DATA-ERR was corrected. 4174100100064 STATUS was updated in all data Subents. 4174100100065 ENDBIB 63 0 4174100100066 COMMON 2 3 4174100100067 ASSUM1 ASSUM2 4174100100068 NB NB 4174100100069 800. 1800. 4174100100070 ENDCOMMON 3 0 4174100100071 ENDSUBENT 70 0 4174100199999 SUBENT 41741002 20240705 42174174100200001 BIB 7 9 4174100200002 REACTION (102-NO-252(0,F),PRE,AKE,LF+HF) 4174100200003 ANALYSIS TKE spectrum was fitted by Gaussian. 4174100200004 ASSUMED (ASSUM3,102-NO-252(0,F),PRE,AKE,LF+HF) 4174100200005 Value used for calibration of TKE spectrum. 4174100200006 REL-REF (R,14541002,C.E.Bemis Jr+,J,PR/C,15,705,1977) 4174100200007 ASSUM3 value 4174100200008 DECAY-DATA (102-NO-252-G,2.46SEC) 2.46+-0.05 sec measured. 4174100200009 ERR-ANALYS (DATA-ERR) Error of Gaussian peak determination. 4174100200010 STATUS (TABLE,,A.V.Isaev+,J,PPN/L,18,449,2021) Text page 452 4174100200011 ENDBIB 9 0 4174100200012 COMMON 3 3 4174100200013 ERR-HL ASSUM3 ASSUM3-ERR 4174100200014 SEC MEV MEV 4174100200015 0.05 202.4 1.2 4174100200016 ENDCOMMON 3 0 4174100200017 DATA 2 1 4174100200018 DATA DATA-ERR 4174100200019 MEV MEV 4174100200020 198.7 1.1 4174100200021 ENDDATA 3 0 4174100200022 ENDSUBENT 21 0 4174100299999 SUBENT 41741003 20240705 42174174100300001 BIB 6 7 4174100300002 REACTION (102-NO-254(0,F),PRE,AKE,LF+HF) 4174100300003 ANALYSIS The same TKE spectrum calibration as for No-252 . 4174100300004 DECAY-DATA (102-NO-254-G,44.1SEC) 44.1+-1.0 sec measured. 4174100300005 REL-REF (D,14054001,J.F.Wild+,J,JALC,213-214,86,1994) 4174100300006 198.2 MeV 4174100300007 ERR-ANALYS (DATA-ERR) Error of Gaussian peak determination. 4174100300008 STATUS (TABLE,,A.V.Isaev+,J,PPN/L,18,449,2021) Text page 452 4174100300009 ENDBIB 7 0 4174100300010 COMMON 1 3 4174100300011 ERR-HL 4174100300012 SEC 4174100300013 1.0 4174100300014 ENDCOMMON 3 0 4174100300015 DATA 2 1 4174100300016 DATA DATA-ERR 4174100300017 MEV MEV 4174100300018 207.2 1.1 4174100300019 ENDDATA 3 0 4174100300020 ENDSUBENT 19 0 4174100399999 SUBENT 41741004 20240705 42174174100400001 BIB 6 11 4174100400002 REACTION 1(102-NO-252(0,F),PR,NU) 4174100400003 2(102-NO-252(0,F),PR,NU,,RAW) 4174100400004 CORRECTION1 Corrected for neutron detection efficiency. 4174100400005 2 Not corrected for neutron detection efficiency. 4174100400006 DECAY-DATA (102-NO-252-G,2.46SEC) 2.46+-0.05 sec measured. 4174100400007 REL-REF (A,41559002,Yu.A.Lazarev+,J,PL/B,52,321,1974) 4174100400008 (A,41540002,A.V.Yeremin+,J,NIM/A,539,441,2005) 4174100400009 ERR-ANALYS (DATA-ERR) Includes statistical uncertainty and 4174100400010 uncertainty arising from the spread of the neutron 4174100400011 detector efficiency. 4174100400012 STATUS (TABLE,,A.V.Isaev+,J,PPN/L,18,449,2021) Text page 452 4174100400013 ENDBIB 11 0 4174100400014 COMMON 1 3 4174100400015 ERR-HL 4174100400016 SEC 4174100400017 0.05 4174100400018 ENDCOMMON 3 0 4174100400019 DATA 4 1 4174100400020 DATA 1DATA-ERR 1DATA 2DATA-ERR 2 4174100400021 PRT/FIS PRT/FIS PRT/FIS PRT/FIS 4174100400022 4.51 0.25 1.94 0.10 4174100400023 ENDDATA 3 0 4174100400024 ENDSUBENT 23 0 4174100499999 SUBENT 41741005 20240705 42174174100500001 BIB 5 9 4174100500002 REACTION 1(102-NO-254(0,F),PR,NU) 4174100500003 2(102-NO-254(0,F),PR,NU,,RAW) 4174100500004 CORRECTION1 Corrected for neutron detection efficiency. 4174100500005 2 Not corrected for neutron detection efficiency. 4174100500006 DECAY-DATA (102-NO-254-G,44.1SEC) 44.1+-1.0 sec measured. 4174100500007 ERR-ANALYS (DATA-ERR) Includes statistical uncertainty and 4174100500008 uncertainty arising from the spread of the neutron 4174100500009 detector efficiency. 4174100500010 STATUS (TABLE,,A.V.Isaev+,J,PPN/L,18,449,2021) Text page 452 4174100500011 ENDBIB 9 0 4174100500012 COMMON 1 3 4174100500013 ERR-HL 4174100500014 SEC 4174100500015 1.0 4174100500016 ENDCOMMON 3 0 4174100500017 DATA 4 1 4174100500018 DATA 1DATA-ERR 1DATA 2DATA-ERR 2 4174100500019 PRT/FIS PRT/FIS PRT/FIS PRT/FIS 4174100500020 2.10 0.22 4.88 0.53 4174100500021 ENDDATA 3 0 4174100500022 ENDSUBENT 21 0 4174100599999 SUBENT 41741006 20240705 42174174100600001 BIB 7 16 4174100600002 REACTION 1(102-NO-254(0,F),PR/NUM,NU) 4174100600003 2(102-NO-254(0,F),PR/NUM,NU,,RAW) 4174100600004 DECAY-DATA (102-NO-254-G,44.1SEC) 44.1+-1.0 sec measured. 4174100600005 ANALYSIS 1 Derived from directly measured data by a priori 4174100600006 known neutron average number and it's dispersion 4174100600007 using the statistical-regularization method 4174100600008 of A.N.Tikhonov (see REL-REF) 4174100600009 2 Directly measured data 4174100600010 REL-REF (N,,V.F.Turchin+,J,UFN,102,345,1970) Issue 3. 4174100600011 (N,,V.F.Turchin+,J,SPU,13,681,1971) Engl.translation. 4174100600012 Issue 6. 4174100600013 ERR-ANALYS (DATA-ERR) Type of uncertainty is not explained in the 4174100600014 article. 4174100600015 STATUS (TABLE,,A.V.Isaev+,J,PPN/L,18,449,2021) Table 2. 4174100600016 HISTORY (20240705A) Zero DATA-ERR was deleted( absent in the 4174100600017 table of the article). 4174100600018 ENDBIB 16 0 4174100600019 NOCOMMON 0 0 4174100600020 DATA 5 10 4174100600021 PART-OUT DATA 1DATA-ERR 1DATA 2DATA-ERR 2 4174100600022 NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM 4174100600023 0. 0. 0.023 0.069 0.023 4174100600024 1. 0. 0.025 0.277 0.046 4174100600025 2. 0.059 0.070 0.292 0.047 4174100600026 3. 0.140 0.079 0.231 0.042 4174100600027 4. 0.208 0.082 0.108 0.029 4174100600028 5. 0.241 0.083 0.023 0.013 4174100600029 6. 0.098 0. 0.218 4174100600030 7. 0.092 0. 0.131 4174100600031 8. 0.050 0. 0.003 4174100600032 9. 0.060 0. 4174100600033 ENDDATA 12 0 4174100600034 ENDSUBENT 33 0 4174100699999 ENDENTRY 6 0 4174199999999