ENTRY 41525 20230203 421141525 0 1 SUBENT 41525001 20230203 421141525 1 1 BIB 13 62 41525 1 2 TITLE Investigations of the neutron-fission processes on the41525 1 3 lead neutron slowing-down spectrometer of INR RAS. 41525 1 4 AUTHOR (A.A.Alekseev, A.A.Bergman, O.N.Goncharenko, A.P.Jukov,41525 1 5 A.D.Perekrestenko,N.M.Sobolevsky,A.N.Volkov,B.I.Fursov,41525 1 6 A.A.Goverdovsky, B.F.Samylin, A.M.Trufanov) 41525 1 7 INSTITUTE (4RUSJIA) A.A.Alekseev, A.A.Bergman, O.N.Goncharenko, 41525 1 8 A.P.Jukov,A.D.Perekrestenko,N.M.Sobolevsky,A.N.Volkov.41525 1 9 Institute for Nuclear Research of Russian Academy of 41525 1 10 Science - INR RAS. 41525 1 11 (4RUSFEI) B.I.Fursov,A.A.Goverdovsky, B.F.Samylin, 41525 1 12 A.M.Trufanov. 41525 1 13 REFERENCE ((S,ISINN-12,237,2004)=(S,JINR-E3-2004-169,237,2004)) 41525 1 14 (J,ZEP,78,799,2003) Iss.6 41525 1 15 (J,JEL,78,347,2003) Engl.translation of ZEP,78,799 41525 1 16 Figs. of U235, Th232 fis. CS ( Subents 002, 007) of 41525 1 17 low size,overlapping,not for digitization. 41525 1 18 REL-REF (N,,A.A.Bergman+,P,JIA-1089,2002) 41525 1 19 Monte-Carlo modeling of spectrometer. 41525 1 20 (N,,Bergman+,P,JIA-1099,2002) 41525 1 21 Neutron flux intensity Monte-Carlo calculation. 41525 1 22 (I,,A.A.Alekseev+,J,YF,62,851,1999) Issue 5. 41525 1 23 Facility details. 41525 1 24 (I,,A.A.Alekseev+,J,PAN,62,793,1999) 41525 1 25 English translation of YF,62,851,1999. 41525 1 26 METHOD (SLODT) 100-ton moderator of ultra-pure (99.99%) lead. 41525 1 27 Slowing down constant 171 keV/microsec**2, 41525 1 28 energy resolution in 1 eV- 1 keV region -28%, 41525 1 29 initial pulse width (FWHM) 0.5-2. microsec. 41525 1 30 Spectrometer LSD-100 (=SVZ-100, =S-100). 41525 1 31 Measured characteristics of spectrometer are close to 41525 1 32 theoretical predictions and Monte-Carlo calculations. 41525 1 33 (ASPEC) To define thickness and mass of sample. 41525 1 34 FACILITY (LINAC,4RUSJIA) 41525 1 35 INC-SOURCE (SPALL) Proton beam of 209 MeV energy,average current 41525 1 36 1-1.5 microA. Proton target at 70 cm from center of 41525 1 37 moderator. 41525 1 38 INC-SPECT Neutron source intensity > 1.E+13 n/sec, neutron flux 41525 1 39 density about 1.E+9 n/(sec*cm**2) on the surface of 41525 1 40 sample. Flux of time decreasing parameter 1.3 (Fig.4 41525 1 41 of S,ISINN-12,237). 41525 1 42 DETECTOR (FISCH) Two fission chambers. 41525 1 43 - Distance between electrodes 3mm, total gas pressure41525 1 44 2.5 atm. Fast amplifiers and time-coders to eliminate 41525 1 45 the background of overlapping pulses driven by 41525 1 46 alpha-particles. 41525 1 47 - Contains four layers of Th-232, Np-237,Cm-245,Pu-239.41525 1 48 Distance between electrodes 1 mm, total gas pressure 41525 1 49 1.5 atm. 41525 1 50 Both chambers were place in one channel at 90 cm from 41525 1 51 proton target. 41525 1 52 MONITOR (92-U-235(N,F),,SIG) as flux monitor in all runs. 41525 1 53 (94-PU-239(N,F),,SIG) as second flux monitor. 41525 1 54 STATUS Request for data was sent 04.08.2009 to 41525 1 55 A.Trufanov - no reply, he's retired. 41525 1 56 (PRELM) Analysis of data has not finished, data are not41525 1 57 ready for EXFOR (some authors left their institutes). 41525 1 58 HISTORY (20090805C) M.M. 41525 1 59 (20100202U) PRELM (and comment) was added in STATUS. 41525 1 60 (20181001U) Refs. ZEP and JEL were added. 41525 1 61 (20230203A) SPA -> SDT, UNOBT -> SPSDD. 41525 1 62 Subents 002-007 were deleted according to a comment of41525 1 63 N.Otsuka (NDS,IAEA). 41525 1 64 ENDBIB 62 0 41525 1 65 NOCOMMON 0 0 41525 1 66 ENDSUBENT 65 0 41525 199999 NOSUBENT 41525002 20230203 421141525 2 1 NOSUBENT 41525003 20230203 421141525 3 1 NOSUBENT 41525004 20230203 421141525 4 1 NOSUBENT 41525005 20230203 421141525 5 1 NOSUBENT 41525006 20230203 421141525 6 1 NOSUBENT 41525007 20230203 421141525 7 1 ENDENTRY 7 0 4152599999999