ENTRY 20402 20180819 22702040200000001 SUBENT 20402001 20180819 22702040200100001 BIB 17 43 2040200100002 INSTITUTE (2UK ALD) 2040200100003 REFERENCE (R,AWRE-O-03/71,1971) 2040200100004 AUTHOR (R.E.Coles) 2040200100005 TITLE Elastic and inelastic scattering of 5.0 MeV neutrons 2040200100006 by sodium 2040200100007 FACILITY (VDG,2UK ALD) AWRE 6 MV Van de Graaff accelerator. 2040200100008 INC-SOURCE (P-T) T(p,n)He-3 reaction, tritium gas target. 2040200100009 INC-SPECT (EN-RSL-FW) The incident energy 5.0 MeV, the neutron 2040200100010 energy spread was 25 keV, mainly due to the proton 2040200100011 energy loss in the gas cell and the finite angle 2040200100012 subtended at the target by the scattering sample 2040200100013 SAMPLE .Produced by pouring molten pure Na metal (> 99.5% Na, 2040200100014 remainder mostly O2), in an argon atmosphere, into 2040200100015 a light cylindrical Al can of wall thickness 0.04 cm. 2040200100016 .The enclosed Na sample was 4.5 cm diam., 4.6 cm long 2040200100017 and weighed 71.093 g and was X-rayed to confirm the 2040200100018 absence of voids. 2040200100019 MONITOR (1-H-1(N,EL)1-H-1,,DA) The scattering at 45 deg from 2040200100020 the polythene sample was measured. 2040200100021 MONIT-REF (,A.Horsley,J,ND/A,2,243,1966) 2040200100022 METHOD (TOF) Time of flight, flight path = 1.75 m, the spectra2040200100023 were obtained at ten angles between 30 and 135. degr. 2040200100024 * The well known neutron group energies from 2040200100025 n-scattering of iron were used as time calibration 2040200100026 and a check on incident neutron energy. 2040200100027 DETECTOR (SCIN) Liquid scintillator (NE213) 2040200100028 REL-REF (M,,J.H.Towle+,J,NP/A,118,500,1968) - The neutron 2040200100029 detection system and experimental procedures described2040200100030 (M,20456001,R.E.Coles+,R,AWRE-O-89/70,1970) - methods 2040200100031 of cross sections calculation, corrections for multiple2040200100032 scattering, flux attenuation and finite angular 2040200100033 resolution of the source-scatterer geometry and 2040200100034 error estimation. 2040200100035 ERR-ANALYS (ERR-1) Uncertainty in detector relative efficiency 2040200100036 CORRECTION Corrections for multiple scattering, flux attenuation 2040200100037 were made using the Monte Carlo program MAGGIE. 2040200100038 COMMENT Compiler: Refs for MONITOR and METHOD were taken 2040200100039 from 20456 Entry (see REL-REF). 2040200100040 HISTORY (19710510C) 2040200100041 (20180821A) SD:Updated to new date formats,lower case. 2040200100042 Part of information from MONITOR moved to METHOD. 2040200100043 MONIT-REF, REL-REF were added. CORRECTION moved to 2040200100044 Subent 001. 2040200100045 ENDBIB 43 0 2040200100046 COMMON 3 3 2040200100047 EN EN-RSL-FW ERR-1 2040200100048 MEV MEV PER-CENT 2040200100049 5.0 0.025 3. 2040200100050 ENDCOMMON 3 0 2040200100051 ENDSUBENT 50 0 2040200199999 SUBENT 20402002 20180819 22702040200200001 BIB 6 17 2040200200002 REACTION (11-NA-23(N,EL)11-NA-23,,SIG) 2040200200003 Integrated. 2040200200004 CORRECTION Additional corrections for finite angular resolution 2040200200005 of source-scatterer geometry were made using the 2040200200006 Monte Carlo program MAGGIE. 2040200200007 ERR-ANALYS (ERR-T) The error quoted was obtained by combining in 2040200200008 quadrature this detector efficiency uncertainty with 2040200200009 the error on the a0 term of the fitted Legendre 2040200200010 polynomial. 2040200200011 COMMENT The integral elastic cross section of 875 +- 35 mb 2040200200012 is compared with the data in the present UK nuclear 2040200200013 data file DFN 182 (T.P.Moorhead, AEEW-R254.), i.e. 2040200200014 887 mb. 2040200200015 STATUS (TABLE) Table 1(a) of AWRE-O-03/71. 2040200200016 (DEP,20402004) Legendre polynomial 2040200200017 HISTORY (20180819U) SD: CORRECTION, ERR-ANALYS, STATUS were 2040200200018 updated. DATA-ERR -> ERR-T. PART-DET deleted. 2040200200019 ENDBIB 17 0 2040200200020 NOCOMMON 0 0 2040200200021 DATA 2 1 2040200200022 DATA ERR-T 2040200200023 B B 2040200200024 0.875 0.035 2040200200025 ENDDATA 3 0 2040200200026 ENDSUBENT 25 0 2040200299999 SUBENT 20402003 20180819 22702040200300001 BIB 5 9 2040200300002 REACTION (11-NA-23(N,EL)11-NA-23,,DA) 2040200300003 CORRECTION Additional corrections for finite angular resolution 2040200300004 of source-scatterer geometry were made using the 2040200300005 Monte Carlo program MAGGIE. 2040200300006 ERR-ANALYS (ERR-T) total error. Maximum total error was 4.2%, 2040200300007 including peak statistical errors 2040200300008 STATUS (TABLE) Table 1(a) of AWRE-O-03/71. 2040200300009 HISTORY (20180819U) SD: CORRECTION, ERR-ANALYS, STATUS were 2040200300010 updated. DATA-ERR -> ERR-T. PART-DET deleted. 2040200300011 ENDBIB 9 0 2040200300012 NOCOMMON 0 0 2040200300013 DATA 3 10 2040200300014 COS-CM DATA-CM ERR-T 2040200300015 NO-DIM MB/SR MB/SR 2040200300016 -0.7288 25.8 1.0 2040200300017 -0.5327 27.2 1.1 2040200300018 -0.2997 29.0 1.2 2040200300019 -0.0441 38.0 1.5 2040200300020 0.1307 37.4 1.4 2040200300021 0.3028 40.4 1.6 2040200300022 0.4666 61.4 2.4 2040200300023 0.6165 87.6 3.3 2040200300024 0.7475 148. 6. 2040200300025 0.8548 230. 9. 2040200300026 ENDDATA 12 0 2040200300027 ENDSUBENT 26 0 2040200399999 SUBENT 20402004 20180819 22702040200400001 BIB 4 6 2040200400002 REACTION (11-NA-23(N,EL)11-NA-23,,DA,,LEG) 2040200400003 ERR-ANALYS (DATA-ERR) error due to fitted Legendre polynomial 2040200400004 STATUS (TABLE) Table 1(b) of AWRE-O-03/71. 2040200400005 HISTORY (20180819U) SD: ERR-ANALYS, STATUS were updated. 2040200400006 PART-DET deleted. CORRECTION moved to Subent 001. 2040200400007 NUMBER -> NUMBER-CM; DATA -> DATA-CM. 2040200400008 ENDBIB 6 0 2040200400009 NOCOMMON 0 0 2040200400010 DATA 3 6 2040200400011 NUMBER-CM DATA-CM DATA-ERR 2040200400012 NO-DIM MB/SR MB/SR 2040200400013 0. 69.7 1.8 2040200400014 1. 97.8 4.6 2040200400015 2. 100.4 6.0 2040200400016 3. 74.1 6.6 2040200400017 4. 44.6 5.5 2040200400018 5. 14.1 4.1 2040200400019 ENDDATA 8 0 2040200400020 ENDSUBENT 19 0 2040200499999 SUBENT 20402005 20180819 22702040200500001 BIB 5 20 2040200500002 REACTION (11-NA-23(N,INL)11-NA-23,PAR,SIG) 2040200500003 integrated 2040200500004 ANALYSIS (4PI1A) 2040200500005 The 439 keV level is considerably interfered 2040200500006 with by the elastic peak. But a shape for elastic peak2040200500007 can be subtracted from the full spectrum to leave the 2040200500008 inelastic spectrum. 2040200500009 ERR-ANALYS (ERR-T) Total error in extracting individual inelastic 2040200500010 peak areas, was estimated to be 5 or 7% in the peak 2040200500011 area. 2040200500012 .Since inelastic angular distributions were isotropic, 2040200500013 the integrated cross sections were taken as 4pi times 2040200500014 the means of the measured differential cross sections,2040200500015 each weighted according to its error, and errors 2040200500016 quoted on inelastic integrated cross sections are the 2040200500017 standard deviation of these means. 2040200500018 STATUS (TABLE) Table 2 of AWRE-O-03/71. 2040200500019 HISTORY (20180819U) SD: ERR-ANALYS, STATUS were updated. 2040200500020 DATA-ERR -> ERR-T. PART-DET deleted. CORRECTION moved 2040200500021 to Subent 001. 2040200500022 ENDBIB 20 0 2040200500023 NOCOMMON 0 0 2040200500024 DATA 3 7 2040200500025 E-LVL DATA ERR-T 2040200500026 MEV B B 2040200500027 0.439 0.240 0.016 2040200500028 2.08 0.105 0.007 2040200500029 2.39 0.038 0.004 2040200500030 2.68 0.110 0.011 2040200500031 2.98 0.100 0.009 2040200500032 3.68 0.087 0.009 2040200500033 3.88 0.125 0.013 2040200500034 ENDDATA 9 0 2040200500035 ENDSUBENT 34 0 2040200599999 SUBENT 20402006 20180819 22702040200600001 BIB 5 17 2040200600002 REACTION (11-NA-23(N,INL)11-NA-23,,SIG) total inelastic 2040200600003 COMMENT .The total inelastic cross section of 805 +- 53 mb 2040200600004 is compared with the data in the present UK nuclear 2040200600005 data file DFN 182 (T.P.Moorhead, AEEW-R254.), i.e. 2040200600006 870 mb. 2040200600007 ERR-ANALYS (ERR-T) Errors are one standard deviation. 2040200600008 .Since inelastic angular distributions were isotropic, 2040200600009 the integrated cross sections were taken as 4pi times 2040200600010 the means of the measured differential cross sections,2040200600011 each weighted according to its error, and errors 2040200600012 quoted on inelastic integrated cross sections are the 2040200600013 standard deviation of these means. 2040200600014 STATUS (TABLE) From p.5 of AWRE-O-03/71. 2040200600015 (DEP,20402005) Partial cr.sect. 2040200600016 HISTORY (20180819U) SD: ERR-ANALYS, STATUS were updated. 2040200600017 DATA-ERR -> ERR-T. PART-DET deleted. CORRECTION 2040200600018 moved to Subent 001. 2040200600019 ENDBIB 17 0 2040200600020 NOCOMMON 0 0 2040200600021 DATA 2 1 2040200600022 DATA ERR-T 2040200600023 B B 2040200600024 0.805 0.053 2040200600025 ENDDATA 3 0 2040200600026 ENDSUBENT 25 0 2040200699999 ENDENTRY 6 0 2040299999999