ENTRY 41733 20210208 419241733 0 1 SUBENT 41733001 20210118 419241733 1 1 BIB 15 67 41733 1 2 TITLE Investigation of the (n, gamma f) process on a 235U 41733 1 3 nucleus 41733 1 4 AUTHOR (Z.Dlouhy, A.Duka-Zolyomi, J.Kristiak, Ts.Panteleev) 41733 1 5 REFERENCE (J,CZJ/B,30,1101,1980) 41733 1 6 (J,CZJ/B,26,1334,1976) Preliminary publication 41733 1 7 (R,JINR-P3-9613,1976) Preliminary publication, 41733 1 8 the same figures as in CZJ/B,26,1334,1976 . 41733 1 9 INSTITUTE (4ZZZDUB) 41733 1 10 FACILITY (LINAC,4ZZZDUB) 41733 1 11 (REAC,4ZZZDUB) 41733 1 12 Pulsed reactor IBR-30 operating in booster mode with 41733 1 13 LINAC. Reactor power ~6 kW, repetition rate 100 Hz, 41733 1 14 neutron pulse ~4 microsec. 41733 1 15 INC-SOURCE (REAC) 41733 1 16 INC-SPECT Neutron flux ~10**3 n/(cm2*sec) 41733 1 17 SAMPLE 2 mg/cm2 thickness layer, total 2 g uranium, enriched 41733 1 18 by U-235 to 90%. Placed in fission 41733 1 19 (92-U-235,ENR=0.90) 41733 1 20 DETECTOR (FISCH) Multilayer fission chamber for fission 41733 1 21 fragments detection. 41733 1 22 Pure methane at 2.5 atm as working gas. 41733 1 23 Detection efficiency ~50%. 41733 1 24 .The energy calibration - by gamma-lines from uranium 41733 1 25 natural activity of U layers placed in the fission 41733 1 26 chambers. 41733 1 27 (GELI) Ge(li) detector of 5 cm3 volume or 41733 1 28 coaxial detector of 7 cm3; 41733 1 29 energy resolution at 185 keV - 1.3 keV and 2.6 keV, 41733 1 30 respectively. 41733 1 31 Placed outside the neutron beam at a distance of 2.5 cm41733 1 32 from the active volume of the fission chamber. 41733 1 33 For gamma-rays detection. 41733 1 34 The absolute efficiency of Ge(li) detector - from 41733 1 35 measurement of total activity of U-235 in the fission 41733 1 36 chamber by using absolute intensity of 41733 1 37 gamma-transitions per 100 alpha-decays of U-235 from 41733 1 38 rel.ref. of Vano+. 41733 1 39 REL-REF (R,,E.Vano+,J,NP/A,251,225,1975) 41733 1 40 METHOD (COINC,TOF) Fast-slow coincidence. 41733 1 41 Time window ~40 nsec. 41733 1 42 Exp. time resolution of prompt coincidence 12 nsec. 41733 1 43 TOF - for resonance neutrons. 41733 1 44 Detection system was installed on the 57 m flight 41733 1 45 path. 41733 1 46 512 - time and 1024 - pulse height channels. 41733 1 47 Two runs - ~100 hr and 163 hr. 41733 1 48 CORRECTION For backgrounds. 41733 1 49 ADD-RES In Abstract of 41733 1 50 Czech.J.of Physics,Part B,v.30,p.1101,1980 : 41733 1 51 - Mean width of gamma+fission reaction resonances was 41733 1 52 determined to be (2.1 +1.5 -1.7) meV. 41733 1 53 - Mean energy of pre-fission gamma-rays - 41733 1 54 (750. +400. -130.) keV for 1-21 eV energy range. 41733 1 55 COMMENT Of compiler M.M. 41733 1 56 On fig.2 of each of 3 articles ( see REFERENCE) 41733 1 57 values of resonance energies Eres are given. 41733 1 58 It's not mentioned in the articles, 41733 1 59 - these Eres were determined by authors in this 41733 1 60 experiment or 41733 1 61 - obtained from other experimental or evaluated data. 41733 1 62 Resonance energies (eV) given on Fig.2 of 41733 1 63 Czech.J.of Physics,Part B,v.30,p.1101,1980: 41733 1 64 29.65, 27.84, 26.49, 25.59, 24.32, 23.40, 22.94, 21.07,41733 1 65 19.30, 18.05, 16.68, 16.08, 15.40, 14.0, 12.85, 12.39, 41733 1 66 11.66, 10.18, 9.28, 8.78, 7.08, 6.39, 4.84, 3.61, 3.14,41733 1 67 2.03. 41733 1 68 HISTORY (20210208C) M.M. 41733 1 69 ENDBIB 67 0 41733 1 70 NOCOMMON 0 0 41733 1 71 ENDSUBENT 70 0 41733 199999 SUBENT 41733002 20210208 419241733 2 1 BIB 4 8 41733 2 2 REACTION (92-U-235(N,F)0-G-0,,MLT,G,RES/MSC) 41733 2 3 Ri - number of registered Kalpha1 gamma-quanta at 41733 2 4 resonance per fission event. 41733 2 5 MISC-COL (MISC) 1/(fission width) for resonance. 41733 2 6 ERR-ANALYS (DATA-ERR) Type of uncertainty is not explained in the 41733 2 7 article. 41733 2 8 STATUS (CURVE) Fig. 4 of 41733 2 9 Czech.J.of Physics,Part B,v.30,p.1101,1980 41733 2 10 ENDBIB 8 0 41733 2 11 NOCOMMON 0 0 41733 2 12 DATA 4 15 41733 2 13 EN-RES DATA DATA-ERR MISC 41733 2 14 EV PRT/FIS PRT/FIS 1/MILLI-EV 41733 2 15 3.14 11.29 E-05 2.77 E-05 0.0095 41733 2 16 3.61 7.12 E-05 1.51 E-05 0.0190 41733 2 17 4.84 15.31 E-05 6.09 E-05 0.2556 41733 2 18 6.39 9.79 E-05 1.22 E-05 0.0912 41733 2 19 7.08 8.15 E-05 2.36 E-05 0.0368 41733 2 20 8.78 8.00 E-05 1.03 E-05 0.0111 41733 2 21 10.18 9.48 E-05 7.60 E-05 0.0167 41733 2 22 11.66 13.49 E-05 4.58 E-05 0.1716 41733 2 23 12.39 7.34 E-05 1.44 E-05 0.0436 41733 2 24 15.40 11.51 E-05 4.47 E-05 0.0239 41733 2 25 16.08 8.23 E-05 1.96 E-05 0.0492 41733 2 26 16.68 11.95 E-05 3.95 E-05 0.0106 41733 2 27 18.05 12.36 E-05 3.17 E-05 0.0121 41733 2 28 19.30 8.78 E-05 0.96 E-05 0.0190 41733 2 29 21.07 7.60 E-05 1.22 E-05 0.0409 41733 2 30 ENDDATA 17 0 41733 2 31 ENDSUBENT 30 0 41733 299999 ENDENTRY 2 0 4173399999999