ENTRY 20402 20180819 227020402 0 1 SUBENT 20402001 20180819 227020402 1 1 BIB 17 43 20402 1 2 INSTITUTE (2UK ALD) 20402 1 3 REFERENCE (R,AWRE-O-03/71,1971) 20402 1 4 AUTHOR (R.E.Coles) 20402 1 5 TITLE Elastic and inelastic scattering of 5.0 MeV neutrons 20402 1 6 by sodium 20402 1 7 FACILITY (VDG,2UK ALD) AWRE 6 MV Van de Graaff accelerator. 20402 1 8 INC-SOURCE (P-T) T(p,n)He-3 reaction, tritium gas target. 20402 1 9 INC-SPECT (EN-RSL-FW) The incident energy 5.0 MeV, the neutron 20402 1 10 energy spread was 25 keV, mainly due to the proton 20402 1 11 energy loss in the gas cell and the finite angle 20402 1 12 subtended at the target by the scattering sample 20402 1 13 SAMPLE .Produced by pouring molten pure Na metal (> 99.5% Na, 20402 1 14 remainder mostly O2), in an argon atmosphere, into 20402 1 15 a light cylindrical Al can of wall thickness 0.04 cm. 20402 1 16 .The enclosed Na sample was 4.5 cm diam., 4.6 cm long 20402 1 17 and weighed 71.093 g and was X-rayed to confirm the 20402 1 18 absence of voids. 20402 1 19 MONITOR (1-H-1(N,EL)1-H-1,,DA) The scattering at 45 deg from 20402 1 20 the polythene sample was measured. 20402 1 21 MONIT-REF (,A.Horsley,J,ND/A,2,243,1966) 20402 1 22 METHOD (TOF) Time of flight, flight path = 1.75 m, the spectra20402 1 23 were obtained at ten angles between 30 and 135. degr. 20402 1 24 * The well known neutron group energies from 20402 1 25 n-scattering of iron were used as time calibration 20402 1 26 and a check on incident neutron energy. 20402 1 27 DETECTOR (SCIN) Liquid scintillator (NE213) 20402 1 28 REL-REF (M,,J.H.Towle+,J,NP/A,118,500,1968) - The neutron 20402 1 29 detection system and experimental procedures described20402 1 30 (M,20456001,R.E.Coles+,R,AWRE-O-89/70,1970) - methods 20402 1 31 of cross sections calculation, corrections for multiple20402 1 32 scattering, flux attenuation and finite angular 20402 1 33 resolution of the source-scatterer geometry and 20402 1 34 error estimation. 20402 1 35 ERR-ANALYS (ERR-1) Uncertainty in detector relative efficiency 20402 1 36 CORRECTION Corrections for multiple scattering, flux attenuation 20402 1 37 were made using the Monte Carlo program MAGGIE. 20402 1 38 COMMENT Compiler: Refs for MONITOR and METHOD were taken 20402 1 39 from 20456 Entry (see REL-REF). 20402 1 40 HISTORY (19710510C) 20402 1 41 (20180821A) SD:Updated to new date formats,lower case. 20402 1 42 Part of information from MONITOR moved to METHOD. 20402 1 43 MONIT-REF, REL-REF were added. CORRECTION moved to 20402 1 44 Subent 001. 20402 1 45 ENDBIB 43 0 20402 1 46 COMMON 3 3 20402 1 47 EN EN-RSL-FW ERR-1 20402 1 48 MEV MEV PER-CENT 20402 1 49 5.0 0.025 3. 20402 1 50 ENDCOMMON 3 0 20402 1 51 ENDSUBENT 50 0 20402 199999 SUBENT 20402002 20180819 227020402 2 1 BIB 6 17 20402 2 2 REACTION (11-NA-23(N,EL)11-NA-23,,SIG) 20402 2 3 Integrated. 20402 2 4 CORRECTION Additional corrections for finite angular resolution 20402 2 5 of source-scatterer geometry were made using the 20402 2 6 Monte Carlo program MAGGIE. 20402 2 7 ERR-ANALYS (ERR-T) The error quoted was obtained by combining in 20402 2 8 quadrature this detector efficiency uncertainty with 20402 2 9 the error on the a0 term of the fitted Legendre 20402 2 10 polynomial. 20402 2 11 COMMENT The integral elastic cross section of 875 +- 35 mb 20402 2 12 is compared with the data in the present UK nuclear 20402 2 13 data file DFN 182 (T.P.Moorhead, AEEW-R254.), i.e. 20402 2 14 887 mb. 20402 2 15 STATUS (TABLE) Table 1(a) of AWRE-O-03/71. 20402 2 16 (DEP,20402004) Legendre polynomial 20402 2 17 HISTORY (20180819U) SD: CORRECTION, ERR-ANALYS, STATUS were 20402 2 18 updated. DATA-ERR -> ERR-T. PART-DET deleted. 20402 2 19 ENDBIB 17 0 20402 2 20 NOCOMMON 0 0 20402 2 21 DATA 2 1 20402 2 22 DATA ERR-T 20402 2 23 B B 20402 2 24 0.875 0.035 20402 2 25 ENDDATA 3 0 20402 2 26 ENDSUBENT 25 0 20402 299999 SUBENT 20402003 20180819 227020402 3 1 BIB 5 9 20402 3 2 REACTION (11-NA-23(N,EL)11-NA-23,,DA) 20402 3 3 CORRECTION Additional corrections for finite angular resolution 20402 3 4 of source-scatterer geometry were made using the 20402 3 5 Monte Carlo program MAGGIE. 20402 3 6 ERR-ANALYS (ERR-T) total error. Maximum total error was 4.2%, 20402 3 7 including peak statistical errors 20402 3 8 STATUS (TABLE) Table 1(a) of AWRE-O-03/71. 20402 3 9 HISTORY (20180819U) SD: CORRECTION, ERR-ANALYS, STATUS were 20402 3 10 updated. DATA-ERR -> ERR-T. PART-DET deleted. 20402 3 11 ENDBIB 9 0 20402 3 12 NOCOMMON 0 0 20402 3 13 DATA 3 10 20402 3 14 COS-CM DATA-CM ERR-T 20402 3 15 NO-DIM MB/SR MB/SR 20402 3 16 -0.7288 25.8 1.0 20402 3 17 -0.5327 27.2 1.1 20402 3 18 -0.2997 29.0 1.2 20402 3 19 -0.0441 38.0 1.5 20402 3 20 0.1307 37.4 1.4 20402 3 21 0.3028 40.4 1.6 20402 3 22 0.4666 61.4 2.4 20402 3 23 0.6165 87.6 3.3 20402 3 24 0.7475 148. 6. 20402 3 25 0.8548 230. 9. 20402 3 26 ENDDATA 12 0 20402 3 27 ENDSUBENT 26 0 20402 399999 SUBENT 20402004 20180819 227020402 4 1 BIB 4 6 20402 4 2 REACTION (11-NA-23(N,EL)11-NA-23,,DA,,LEG) 20402 4 3 ERR-ANALYS (DATA-ERR) error due to fitted Legendre polynomial 20402 4 4 STATUS (TABLE) Table 1(b) of AWRE-O-03/71. 20402 4 5 HISTORY (20180819U) SD: ERR-ANALYS, STATUS were updated. 20402 4 6 PART-DET deleted. CORRECTION moved to Subent 001. 20402 4 7 NUMBER -> NUMBER-CM; DATA -> DATA-CM. 20402 4 8 ENDBIB 6 0 20402 4 9 NOCOMMON 0 0 20402 4 10 DATA 3 6 20402 4 11 NUMBER-CM DATA-CM DATA-ERR 20402 4 12 NO-DIM MB/SR MB/SR 20402 4 13 0. 69.7 1.8 20402 4 14 1. 97.8 4.6 20402 4 15 2. 100.4 6.0 20402 4 16 3. 74.1 6.6 20402 4 17 4. 44.6 5.5 20402 4 18 5. 14.1 4.1 20402 4 19 ENDDATA 8 0 20402 4 20 ENDSUBENT 19 0 20402 499999 SUBENT 20402005 20180819 227020402 5 1 BIB 5 20 20402 5 2 REACTION (11-NA-23(N,INL)11-NA-23,PAR,SIG) 20402 5 3 integrated 20402 5 4 ANALYSIS (4PI1A) 20402 5 5 The 439 keV level is considerably interfered 20402 5 6 with by the elastic peak. But a shape for elastic peak20402 5 7 can be subtracted from the full spectrum to leave the 20402 5 8 inelastic spectrum. 20402 5 9 ERR-ANALYS (ERR-T) Total error in extracting individual inelastic 20402 5 10 peak areas, was estimated to be 5 or 7% in the peak 20402 5 11 area. 20402 5 12 .Since inelastic angular distributions were isotropic, 20402 5 13 the integrated cross sections were taken as 4pi times 20402 5 14 the means of the measured differential cross sections,20402 5 15 each weighted according to its error, and errors 20402 5 16 quoted on inelastic integrated cross sections are the 20402 5 17 standard deviation of these means. 20402 5 18 STATUS (TABLE) Table 2 of AWRE-O-03/71. 20402 5 19 HISTORY (20180819U) SD: ERR-ANALYS, STATUS were updated. 20402 5 20 DATA-ERR -> ERR-T. PART-DET deleted. CORRECTION moved 20402 5 21 to Subent 001. 20402 5 22 ENDBIB 20 0 20402 5 23 NOCOMMON 0 0 20402 5 24 DATA 3 7 20402 5 25 E-LVL DATA ERR-T 20402 5 26 MEV B B 20402 5 27 0.439 0.240 0.016 20402 5 28 2.08 0.105 0.007 20402 5 29 2.39 0.038 0.004 20402 5 30 2.68 0.110 0.011 20402 5 31 2.98 0.100 0.009 20402 5 32 3.68 0.087 0.009 20402 5 33 3.88 0.125 0.013 20402 5 34 ENDDATA 9 0 20402 5 35 ENDSUBENT 34 0 20402 599999 SUBENT 20402006 20180819 227020402 6 1 BIB 5 17 20402 6 2 REACTION (11-NA-23(N,INL)11-NA-23,,SIG) total inelastic 20402 6 3 COMMENT .The total inelastic cross section of 805 +- 53 mb 20402 6 4 is compared with the data in the present UK nuclear 20402 6 5 data file DFN 182 (T.P.Moorhead, AEEW-R254.), i.e. 20402 6 6 870 mb. 20402 6 7 ERR-ANALYS (ERR-T) Errors are one standard deviation. 20402 6 8 .Since inelastic angular distributions were isotropic, 20402 6 9 the integrated cross sections were taken as 4pi times 20402 6 10 the means of the measured differential cross sections,20402 6 11 each weighted according to its error, and errors 20402 6 12 quoted on inelastic integrated cross sections are the 20402 6 13 standard deviation of these means. 20402 6 14 STATUS (TABLE) From p.5 of AWRE-O-03/71. 20402 6 15 (DEP,20402005) Partial cr.sect. 20402 6 16 HISTORY (20180819U) SD: ERR-ANALYS, STATUS were updated. 20402 6 17 DATA-ERR -> ERR-T. PART-DET deleted. CORRECTION 20402 6 18 moved to Subent 001. 20402 6 19 ENDBIB 17 0 20402 6 20 NOCOMMON 0 0 20402 6 21 DATA 2 1 20402 6 22 DATA ERR-T 20402 6 23 B B 20402 6 24 0.805 0.053 20402 6 25 ENDDATA 3 0 20402 6 26 ENDSUBENT 25 0 20402 699999 ENDENTRY 6 0 2040299999999