ENTRY 22194 20230517 2219400000001 SUBENT 22194001 20230517 20231011 2219400100001 BIB 12 32 2219400100002 TITLE Measurements of eta of 235-U for subthermal neutron 2219400100003 energies 2219400100004 AUTHOR (H.Weigmann,B.Keck,J.A.Wartena,P.Geltenbort, 2219400100005 K.Schreckenbach) 2219400100006 REFERENCE (C,90MARSEI,3,(PI),33,1990) 2219400100007 INSTITUTE (2ZZZGEL) H.W., B.K., J.A.W 2219400100008 (2FR ILL) P.G., K.S. 2219400100009 COMMENT Data have been normalised to 2.075 at 25 milli-eV. 2219400100010 SAMPLE 'Black' metallic U sample of 4.59 g/cm2 inserted in 2219400100011 cylindrical 6-Li sleeve to shield from out-of-time 2219400100012 scattered neutrons. 2219400100013 DETECTOR (SCIN) 5 cm diam and 5 cm thick NE213 liquid scinti- 2219400100014 llator for detection of fission neutrons from sample. 2219400100015 METHOD (PSD) To distinguish fission neutrons from gammas 2219400100016 CORRECTION *Count losses of all kinds, especially due to analyzer 2219400100017 and PSD dead-times 2219400100018 *Backgrounds 2219400100019 *Incomplete absorption and scattering of incident slow 2219400100020 neutrons in the U and B sample 2219400100021 *Multiple scattering of the fission neutrons produced 2219400100022 in the U sample 2219400100023 *Self-absorption of the gammas in the B sample 2219400100024 ERR-ANALYS (ERR-S) Statistical error 2219400100025 (ERR-1) Total systematic error. The data have been 2219400100026 normalized to 2.075 at 25 milli-eV, therefore ERR-1 2219400100027 goes to zero at this energy. 2219400100028 In the figures of the main reference the error bars 2219400100029 represent a linear addition of ERR-S and ERR-1. 2219400100030 STATUS (TABLE) Data obtained from author on tape. 2219400100031 HISTORY (19910719C) S.W. 2219400100032 (20230517A) SD:Updated to new date formats,lower case. 2219400100033 Corrections in all Subents. 2219400100034 ENDBIB 32 0 2219400100035 NOCOMMON 0 0 2219400100036 ENDSUBENT 35 0 2219400199999 SUBENT 22194002 20230517 20231011 2219400200001 BIB 9 24 2219400200002 REACTION (92-U-235(N,ABS),,ETA) 2219400200003 FACILITY (LINAC,2ZZZGEL) Electron linac, 40 Hz repetition rate 2219400200004 METHOD (TOF) 8.8 m flight path 2219400200005 MONITOR (5-B-10(N,A)3-LI-7,PAR,SIG,G) 2219400200006 INC-SOURCE (PHOTO) With liquid methane moderator as white source 2219400200007 of subthermal neutrons. The beam was defined by a 2219400200008 3.5 m collimation system also containing a 2 cm thick 2219400200009 Be filter to reduce flux above 6.8 milli-eV. 2219400200010 SAMPLE 0.11 g/cm2 thick 10-B slab replaced the U sample for 2219400200011 the precise flux measurement, inserted in 6-Li sleeve.2219400200012 DETECTOR (PROPC) Two parallel plate proportional counters used 2219400200013 as flux monitors and located 80 cm upstream from the 2219400200014 U sample. The first counter was as follows: 2219400200015 1st run: 162 ug/cm2 6-LiF layer (95.65% 6-Li) 2219400200016 evaporated on 40 micron thick Al backing 2219400200017 2nd run: 3.6 ug/cm2 10-B layer (90% 10-B) 2219400200018 evaporated on 40 micron thick Al backing 2219400200019 and the second counter: 2219400200020 both runs: 279 ug/cm2 uf4 (97.6% 235-U) evaporated 2219400200021 on Au coated 3.5 micron mylar foil. 2219400200022 (SCIN) Gammas from the boron sample were detected 2219400200023 with a hydrogen free C6F6 liquid scintillator. 2219400200024 STATUS (TABLE) Data obtained from author on tape. 2219400200025 HISTORY (20230517A) SD: Data units corrected. 2219400200026 ENDBIB 24 0 2219400200027 NOCOMMON 0 0 2219400200028 DATA 4 73 2219400200029 EN DATA ERR-S ERR-1 2219400200030 MILLI-EV PRT/REAC PRT/REAC PRT/REAC 2219400200031 1.80 2.018 0.015 0.131 2219400200032 2.25 2.026 0.010 0.066 2219400200033 2.75 2.024 0.007 0.033 2219400200034 3.50 2.036 0.005 0.017 2219400200035 4.50 2.045 0.004 0.009 2219400200036 5.50 2.050 0.005 0.008 2219400200037 6.50 2.052 0.006 0.007 2219400200038 7.50 2.054 0.006 0.006 2219400200039 8.50 2.062 0.006 0.005 2219400200040 9.50 2.052 0.005 0.004 2219400200041 11.00 2.059 0.004 0.003 2219400200042 13.00 2.064 0.004 0.002 2219400200043 15.00 2.071 0.003 0.002 2219400200044 17.00 2.068 0.004 0.001 2219400200045 19.00 2.071 0.004 0.001 2219400200046 21.00 2.082 0.005 0.001 2219400200047 23.00 2.066 0.005 0.000 2219400200048 25.00 2.075 0.005 0.000 2219400200049 27.00 2.071 0.006 0.000 2219400200050 29.00 2.078 0.006 0.001 2219400200051 31.00 2.080 0.006 0.001 2219400200052 33.00 2.084 0.007 0.001 2219400200053 35.00 2.080 0.007 0.001 2219400200054 37.00 2.073 0.008 0.002 2219400200055 39.00 2.089 0.011 0.002 2219400200056 42.50 2.072 0.011 0.002 2219400200057 47.50 2.092 0.012 0.003 2219400200058 52.50 2.087 0.007 0.006 2219400200059 57.50 2.092 0.008 0.012 2219400200060 62.50 2.082 0.007 0.013 2219400200061 67.50 2.089 0.008 0.013 2219400200062 72.50 2.085 0.009 0.015 2219400200063 77.50 2.082 0.009 0.016 2219400200064 82.50 2.080 0.010 0.016 2219400200065 87.50 2.074 0.010 0.017 2219400200066 92.50 2.073 0.011 0.017 2219400200067 97.50 2.086 0.011 0.017 2219400200068 105.00 2.065 0.008 0.016 2219400200069 115.00 2.063 0.009 0.016 2219400200070 125.00 2.057 0.009 0.016 2219400200071 135.00 2.058 0.009 0.016 2219400200072 145.00 2.050 0.010 0.016 2219400200073 155.00 2.044 0.010 0.016 2219400200074 165.00 2.035 0.011 0.016 2219400200075 175.00 2.027 0.011 0.016 2219400200076 185.00 2.021 0.011 0.016 2219400200077 195.00 2.016 0.011 0.016 2219400200078 205.00 2.000 0.012 0.016 2219400200079 215.00 1.989 0.012 0.016 2219400200080 225.00 1.995 0.012 0.016 2219400200081 235.00 1.975 0.013 0.016 2219400200082 245.00 1.966 0.013 0.016 2219400200083 255.00 1.969 0.013 0.016 2219400200084 265.00 1.962 0.014 0.016 2219400200085 275.00 1.956 0.014 0.016 2219400200086 285.00 1.967 0.014 0.016 2219400200087 295.00 1.985 0.014 0.016 2219400200088 305.00 1.997 0.015 0.016 2219400200089 315.00 2.031 0.016 0.016 2219400200090 325.00 2.046 0.016 0.016 2219400200091 335.00 2.074 0.017 0.017 2219400200092 345.00 2.087 0.017 0.017 2219400200093 355.00 2.110 0.018 0.017 2219400200094 365.00 2.115 0.018 0.017 2219400200095 375.00 2.132 0.019 0.017 2219400200096 385.00 2.139 0.019 0.018 2219400200097 395.00 2.146 0.020 0.018 2219400200098 405.00 2.159 0.020 0.018 2219400200099 415.00 2.160 0.021 0.018 2219400200100 425.00 2.138 0.020 0.018 2219400200101 435.00 2.146 0.022 0.018 2219400200102 445.00 2.130 0.022 0.018 2219400200103 455.00 2.135 0.022 0.018 2219400200104 ENDDATA 75 0 2219400200105 ENDSUBENT 104 0 2219400299999 SUBENT 22194003 20230517 20231011 2219400300001 BIB 8 19 2219400300002 REACTION (92-U-235(N,ABS),,ETA) 2219400300003 FACILITY (REAC,2FR ILL) High flux reactor 2219400300004 MONITOR (48-CD-0(N,G),,SIG) 2219400300005 INC-SOURCE (REAC) Thermal neutron guide with double chopper 2219400300006 set-up. The two choppers were separated by 2.9 m, and 2219400300007 were run at slightly different speeds such that their 2219400300008 relative phase and therefore en is varied continuously2219400300009 SAMPLE 0.7 mm thick Cd 'black' capture sample replaced the 2219400300010 U sample for the precise flux measurement, inserted in2219400300011 6-Li sleeve. 2219400300012 DETECTOR (IOCH) Used as flux monitor, loaded with a 2219400300013 175 ug/cm2 235-U sample (99% 235-U) deposited 2219400300014 onto Au coated 3.5 micron mylar foil, and located 2219400300015 65 cm upstream from the U sample. 2219400300016 (COIN,SCIN,SCIN) Two hydrogen free C6F6 liquid 2219400300017 scintillators to detect gammas from the Cd capture 2219400300018 sample. 2219400300019 STATUS (TABLE) Data obtained from author on tape. 2219400300020 HISTORY (20230517A) SD: Data units corrected. 2219400300021 ENDBIB 19 0 2219400300022 NOCOMMON 0 0 2219400300023 DATA 4 47 2219400300024 EN DATA ERR-S ERR-1 2219400300025 MILLI-EV PRT/REAC PRT/REAC PRT/REAC 2219400300026 1.50 1.987 0.012 0.030 2219400300027 1.80 2.024 0.012 0.025 2219400300028 2.25 2.038 0.007 0.023 2219400300029 2.75 2.042 0.003 0.021 2219400300030 3.50 2.026 0.012 0.008 2219400300031 4.50 2.031 0.012 0.007 2219400300032 5.50 2.046 0.012 0.007 2219400300033 6.50 2.056 0.011 0.006 2219400300034 7.50 2.052 0.011 0.006 2219400300035 8.50 2.070 0.009 0.006 2219400300036 9.50 2.046 0.010 0.005 2219400300037 11.00 2.056 0.006 0.005 2219400300038 13.00 2.070 0.007 0.004 2219400300039 15.00 2.057 0.006 0.003 2219400300040 17.00 2.063 0.006 0.003 2219400300041 19.00 2.082 0.007 0.002 2219400300042 21.00 2.077 0.006 0.001 2219400300043 23.00 2.083 0.008 0.000 2219400300044 25.00 2.075 0.007 0.000 2219400300045 27.00 2.068 0.007 0.001 2219400300046 29.00 2.071 0.007 0.001 2219400300047 31.00 2.082 0.009 0.002 2219400300048 33.00 2.087 0.007 0.002 2219400300049 35.00 2.072 0.009 0.002 2219400300050 36.76 2.079 0.009 0.003 2219400300051 38.50 2.077 0.009 0.003 2219400300052 40.36 2.075 0.009 0.003 2219400300053 42.35 2.103 0.009 0.004 2219400300054 44.51 2.089 0.010 0.004 2219400300055 46.82 2.108 0.010 0.004 2219400300056 49.33 2.081 0.010 0.004 2219400300057 52.04 2.088 0.011 0.004 2219400300058 54.98 2.073 0.011 0.004 2219400300059 58.18 2.093 0.011 0.004 2219400300060 61.66 2.091 0.011 0.004 2219400300061 65.47 2.099 0.011 0.004 2219400300062 69.64 2.089 0.011 0.004 2219400300063 74.23 2.103 0.011 0.005 2219400300064 79.27 2.094 0.012 0.005 2219400300065 84.86 2.094 0.012 0.005 2219400300066 91.06 2.078 0.011 0.006 2219400300067 97.96 2.089 0.011 0.006 2219400300068 105.67 2.073 0.012 0.006 2219400300069 114.34 2.070 0.011 0.008 2219400300070 124.11 2.068 0.013 0.011 2219400300071 135.20 2.067 0.015 0.018 2219400300072 147.83 2.042 0.018 0.029 2219400300073 ENDDATA 49 0 2219400300074 ENDSUBENT 73 0 2219400399999 ENDENTRY 3 0 2219499999999