ENTRY 21202 20230516 231721202 0 1 SUBENT 21202001 20230516 231721202 1 1 BIB 10 35 21202 1 2 TITLE Measurements of the energy dependence of the fission 21202 1 3 neutron yield per neutron absorbed in Pu-239 and 21202 1 4 U-235 in the range 0.006-0.36 eV 21202 1 5 AUTHOR (H.M.Skarsgard,C.J.Kenward) 21202 1 6 REFERENCE (J,JNE,6,212,1958) 21202 1 7 (R,AERE-R/R-2267,1958) 21202 1 8 INSTITUTE (2UK HAR) 21202 1 9 FACILITY (REAC,2UK HAR) BEPO reactor at AERE 21202 1 10 (SPECC,2UK HAR) K-Cl crystal spectrometer. 21202 1 11 (SELVE,2UK HAR) Mechanical velocity selector in 21202 1 12 conjunction with the crystal spectrometer for neutron 21202 1 13 energies below 0.05 eV to eliminate higher order 21202 1 14 neutrons from the diffracted beam. 21202 1 15 SAMPLE Disc of fissile material of sufficient thickness to 21202 1 16 almost totally absorb the incident beam. 21202 1 17 METHOD Detection of fission neutrons. 21202 1 18 DETECTOR (BF3) 16 BF-3 counters embedded in paraffin wax 21202 1 19 placed symmetrically around the sample. Efficiency 21202 1 20 for fast neutrons about 0.3% inside of detector coated 21202 1 21 with B2-O3 to absorb slow neutrons scattered from the 21202 1 22 sample. BF-3 counter to monitor flux above 0.05 eV. 21202 1 23 (PROPC) B-10 foil proportional counter to monitor 21202 1 24 flux below 0.05 eV. 21202 1 25 CORRECTION Corrections for- 21202 1 26 departure of monitor counter response from 1/V law. 21202 1 27 Scattering and absorption by canning material and 21202 1 28 isotopic impurities in the sample. 21202 1 29 Transmission of fissile samples. 21202 1 30 Counting losses due to scaler dead time. 21202 1 31 Higher order contamination of the neutron beam. 21202 1 32 Cross-sections from BNL-325 used to make the 21202 1 33 corrections. 21202 1 34 HISTORY (19791205T) 21202 1 35 (20230516A) SD:Updated to new date formats,lower case. 21202 1 36 Corrections in all Subents. 21202 1 37 ENDBIB 35 0 21202 1 38 NOCOMMON 0 0 21202 1 39 ENDSUBENT 38 0 21202 199999 SUBENT 21202002 20230516 231721202 2 1 BIB 3 4 21202 2 2 REACTION (92-U-235(N,ABS),,ETA) 21202 2 3 STATUS (NDD) From NEUDADA. 21202 2 4 Graphical data on fig.4 of the J.Nucl.En.,6(1958)212. 21202 2 5 HISTORY (20230516A) SD: Data units updated (NO-DIM -> PRT/REAC)21202 2 6 ENDBIB 4 0 21202 2 7 NOCOMMON 0 0 21202 2 8 DATA 2 8 21202 2 9 EN DATA 21202 2 10 EV PRT/REAC 21202 2 11 6.00E-03 2.065 21202 2 12 7.80E-03 2.08 21202 2 13 1.00E-02 2.06 21202 2 14 1.30E-02 2.11 21202 2 15 1.80E-02 2.08 21202 2 16 2.53E-02 2.08 21202 2 17 3.50E-02 2.08 21202 2 18 5.00E-02 2.08 21202 2 19 ENDDATA 10 0 21202 2 20 ENDSUBENT 19 0 21202 299999 SUBENT 21202003 20230516 231721202 3 1 BIB 3 4 21202 3 2 REACTION (92-U-235(N,ABS),,ALF) 21202 3 3 STATUS (NDD) From NEUDADA. Data absent in the 21202 3 4 J.Nucl.En.,6(1958)212 and in the AERE-R/R-2267,1958. 21202 3 5 HISTORY (20230516U) SD: BIB updated. 21202 3 6 ENDBIB 4 0 21202 3 7 NOCOMMON 0 0 21202 3 8 DATA 2 8 21202 3 9 EN DATA 21202 3 10 EV NO-DIM 21202 3 11 6.0000E-03 1.8300E-01 21202 3 12 7.8000E-03 1.7400E-01 21202 3 13 1.0000E-02 1.8500E-01 21202 3 14 1.3000E-02 1.5700E-01 21202 3 15 1.8000E-02 1.7400E-01 21202 3 16 2.5300E-02 1.7400E-01 21202 3 17 3.5000E-02 1.7400E-01 21202 3 18 5.0000E-02 1.7400E-01 21202 3 19 ENDDATA 10 0 21202 3 20 ENDSUBENT 19 0 21202 399999 SUBENT 21202004 20230516 231721202 4 1 BIB 3 4 21202 4 2 REACTION (94-PU-239(N,ABS),,ETA) 21202 4 3 STATUS (NDD) From NEUDADA. 21202 4 4 Graphical data on fig.2 of the J.Nucl.En.,6(1958)212. 21202 4 5 HISTORY (20230516A) SD: Data units updated (NO-DIM -> PRT/REAC)21202 4 6 ENDBIB 4 0 21202 4 7 NOCOMMON 0 0 21202 4 8 DATA 2 17 21202 4 9 EN DATA 21202 4 10 EV PRT/REAC 21202 4 11 7.00E-03 2.076 21202 4 12 1.00E-02 2.095 21202 4 13 1.26E-02 2.115 21202 4 14 1.75E-02 2.085 21202 4 15 2.30E-02 2.082 21202 4 16 3.00E-02 2.06 21202 4 17 4.00E-02 2.055 21202 4 18 5.00E-02 2.01 21202 4 19 6.00E-02 1.972 21202 4 20 7.40E-02 1.925 21202 4 21 9.00E-02 1.88 21202 4 22 1.10E-01 1.833 21202 4 23 1.35E-01 1.785 21202 4 24 1.60E-01 1.705 21202 4 25 2.10E-01 1.65 21202 4 26 2.80E-01 1.63 21202 4 27 3.60E-01 1.675 21202 4 28 ENDDATA 19 0 21202 4 29 ENDSUBENT 28 0 21202 499999 ENDENTRY 4 0 2120299999999