ENTRY 41775 20240822 421841775000 1 SUBENT 41775001 20240822 421841775001 1 BIB 12 54 41775001 2 TITLE Prompt neutron emission in 250No spontaneous fission 41775001 3 associated with ground and isomeric state decays 41775001 4 AUTHOR (R.S.Mukhin,A.V.Isaev,A.V.Andreev,M.L.Chelnokov, 41775001 5 V.I.Chepigin,H.M.Devaraja, I.N.Izosimov,A.A.Kuznetsova,41775001 6 O.N.Malyshev,A.G.Popeko,Yu.A.Popov,A.Rahmatinejad, 41775001 7 B.Sailaubekov,T.M.Shneidman,E.A.Sokol,A.I.Svirikhin, 41775001 8 M.S.Tezekbayeva,M.A.Bychkov,A.V.Yeremin, 41775001 9 O.Dorvaux,B.Gall,K.Kessaci,K.Hauschild,A.Lopez-Martens)41775001 10 REFERENCE (J,CPH/C,48,064002,2024) 41775001 11 #doi:10.1088/1674-1137/ad361a 41775001 12 INSTITUTE (4ZZZDUB) R.S.Mukhin,A.V.Isaev,A.V.Andreev, 41775001 13 M.L.Chelnokov,V.I.Chepigin,H.M.Devaraja, I.N.Izosimov, 41775001 14 A.A.Kuznetsova,O.N.Malyshev,A.G.Popeko,Yu.A.Popov, 41775001 15 A.Rahmatinejad,B.Sailaubekov,T.M.Shneidman,E.A.Sokol, 41775001 16 A.I.Svirikhin,M.S.Tezekbayeva,M.A.Bychkov,A.V.Yeremin 41775001 17 (4RUSDBU) A.V.Isaev,O.N.Malyshev,A.G.Popeko,Yu.A.Popov,41775001 18 A.I.Svirikhin 41775001 19 (4KASKAZ) B.Sailaubekov,M.S.Tezekbayeva 41775001 20 (4KASATN) B.Sailaubekov 41775001 21 (4RUSRUS) Kazan Federal University, Kazan, Russia. 41775001 22 T.M.Shneidman 41775001 23 (2FR STR) O.Dorvaux,B.Gall,K.Kessaci 41775001 24 (2FR PAR) K.Hauschild,A.Lopez-Martens 41775001 25 FACILITY (CYCLO,4ZZZDUB) U-400 cyclotron to produce No-250 . 41775001 26 Ca-48 beam energy 226+-2.0 MeV. 41775001 27 . SHELS separator. 41775001 28 SAMPLE Produced in the complete fusion reaction 41775001 29 Ca-48(Pb-204,2N)No-250 41775001 30 DETECTOR (SISD,HE3SP) Detection system SFiNx consists of 41775001 31 box-like assembly of double-sided silicon 41775001 32 strip detectors ( DSSD )surrounded by 116 neutron 41775001 33 counters filled with He3 at 7 atm pressure. 41775001 34 Single neutron detection efficiency calibration was 41775001 35 carried out using the 248Cm source, assuming that 41775001 36 the energy spectrum of prompt SF neutrons of 250No does41775001 37 not differ significantly from that of 248Cm. 41775001 38 The single neutron detection efficiency (56+-1) %. 41775001 39 The DSSD placed at the focal plane of SHELS consisted 41775001 40 of 128 x 128 strips, its area was 100 x 100 mm2. 41775001 41 Eight side 16 x 16 DSSDs of 50 x 50 mm2 were located 41775001 42 around the focal plane DSSD in the backward direction. 41775001 43 DSSD energy calibration at alpha-particle energies was 41775001 44 performed using the 174Yb(48Ca,xn)222-xTh reaction. 41775001 45 Dead time of detection system 4.5 microsec. 41775001 46 METHOD 1357 events of 252No spontaneous fission were found. 41775001 47 CORRECTION For background and detection efficiency. 41775001 48 ADD-RES Half-lives of two activities extracted from fitting 41775001 49 curve - 4.7+-0.2 and 46.+-4. microsec; 41775001 50 expected number of nuclei - 1510+-50 and 500+-50, 41775001 51 respectively. 41775001 52 Isomer population probability was estimated to be 41775001 53 0.25+-0.02. 41775001 54 COMMENT This work was supported by JINR grant 23-502-06. 41775001 55 HISTORY (20240822C) M.M. 41775001 56 ENDBIB 54 0 41775001 57 NOCOMMON 0 0 41775001 58 ENDSUBENT 57 0 4177500199999 SUBENT 41775002 20240822 421841775002 1 BIB 3 5 41775002 2 REACTION (102-NO-250(0,F),PR,NU) 41775002 3 ERR-ANALYS (DATA-ERR) Type of uncertainty is not explained in the 41775002 4 article. 41775002 5 STATUS (TABLE,,R.S.Mukhin+,J,CPH/C,48,064002,2024) 41775002 6 Text pages 064002-4, 064002-5. 41775002 7 ENDBIB 5 0 41775002 8 NOCOMMON 0 0 41775002 9 DATA 2 1 41775002 10 DATA DATA-ERR 41775002 11 PRT/FIS PRT/FIS 41775002 12 4.1 0.1 41775002 13 ENDDATA 3 0 41775002 14 ENDSUBENT 13 0 4177500299999 SUBENT 41775003 20240822 421841775003 1 BIB 5 8 41775003 2 REACTION (102-NO-250(0,F),PR/NUM,NU) 41775003 3 MISC-COL (MISC) Number of events 41775003 4 ANALYSIS No significant difference between two (short and long) 41775003 5 activities concerning the prompt neutron multiplicity 41775003 6 distribution were found. 41775003 7 ERR-ANALYS (DATA-ERR) Type of uncertainty is not explained in the 41775003 8 article. 41775003 9 STATUS (TABLE,,R.S.Mukhin+,J,CPH/C,48,064002,2024) Table 1 41775003 10 ENDBIB 8 0 41775003 11 COMMON 1 3 41775003 12 ERR-HL 41775003 13 SEC 41775003 14 0.04 41775003 15 ENDCOMMON 3 0 41775003 16 DATA 4 10 41775003 17 PART-OUT DATA DATA-ERR MISC 41775003 18 NO-DIM NO-DIM NO-DIM NO-DIM 41775003 19 0. 0.009 0.007 32. 41775003 20 1. 0.004 0.006 100. 41775003 21 2. 0.102 0.015 169. 41775003 22 3. 0.226 0.018 125. 41775003 23 4. 0.280 0.019 63. 41775003 24 5. 0.232 0.020 18. 41775003 25 6. 0.120 0.017 3. 41775003 26 7. 0.024 0.013 0. 41775003 27 8. 0.002 0.003 0. 41775003 28 9. 0.001 0.003 0. 41775003 29 ENDDATA 12 0 41775003 30 ENDSUBENT 29 0 4177500399999 ENDENTRY 3 0 4177599999999